CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2021
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IF 3.171
Fenghua Geng,Rui Zhang,Luo Wu,Zheng Tang,Han Liu,Haiyan Liu,Zhichang Liu,Chunming Xu,Xianghai Meng
N -alkyl imidazolium carbonate ionic liquids were employed to separate and recover naphthenic acid from model oils. The effects of the cationic and anionic structures of ionic liquids and operating conditions on the deacidification performance were investigated. The deacidification performance of traditional organic solvents was also investigated for comparison. The results indicated that the naphthenic acid could be completely removed from the model oil with a small mass ratio of ionic liquid to oil. The extracted naphthenic acid was regenerated with a recovery of up to 92%. In addition, imidazolium carbonate ionic liquids could be successfully regenerated and recycled. The mechanism of interaction between imidazole ionic liquids and the naphthenic acid molecules were explained by Gauss calculation.
研究领域:
化学工程
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环境科学
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DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2023
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IF 8.7
Shuai Zhu,Zhuoyu Li,Meiqi Yu,Qinghong Wang,Chunmao Chen,Jun Ma
The petroleum wastewater (PWW) contains a diverse range of recalcitrant organic contaminants . Of particular concern is the removal of naphthenic acids (NAs) due to the high toxicity and persistence. Persulfate (PS) based oxidation processes have shown promising in treating refractory wastewater, while the high costs of prepared catalysts limited their widespread implementation. This study aims to develop a cost-effective natural pyrite activated PS system for PWW treatment . The removal of NAs by pyrite/PS system was initially investigated. More than 90% of cyclohexanoic acid (CHA), a model NA, was removed in pyrite/PS system (2.0 g/L pyrite, 4.0 mM PS) at initial pH of 3–11. Scavenging experiments revealed that Fe(II) on pyrite surface was the reactive site for PS activation to generate reactive species, including sulfate radical (SO 4 ·− ), Fe(IV) and hydroxyl radical (·OH) for CHA degradation. Reactions of Fe(III) with S helped restore Fe(II) and enhance PS activation, resulting in the sustained catalytic activity of pyrites over five cycles. Cl − , SO 4 2− and NO 3 − below 10 mM had minimal impact on CHA degradation in pyrite/PS system. However, over 1 mM of HCO 3 − inhibited 80% of CHA removal due to the buffer effect to maintain the high solution pH. Removing HCO 3 − from real PWW restored the removal of CHA and of total organic carbon (TOC) to over 90% and 71.3% in pyrite/PS system, respectively. Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) results indicated that O 2‒6 species including NAs were primarily eliminated through mineralization and oxygen addition. Besides, O 3 – 5 S, NO 3 – 5 S and N 3 O 2‒4 species were the most susceptible to oxidation in PWW, resulting in the increase of the oxidation level (i.e., O/C wa ) from 0.41 to 0.56 after treatment. This study provides valuable insights into the treatment of NAs in real PWW, and potential application of natural minerals in the treatment of industrial wastewater .
研究领域:
环境科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2023
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IF 9.8
Yize Liu,Meiyu Li,Ruoyao Zhang,Tengda Zhao,Jing Han,Aibin Kang,Chunmao Chen,Hongwei Ren,Erhong Duan
With the development of the petrochemical industry , a large amount of naphthenic acids in petrochemical wastewater was accumulated in the environment, causing serious environmental pollution . Most of the commonly used methods for the determination of naphthenic acids have the characteristics of high energy consumption, complicated pretreatment , long detection cycle, and the need to send samples to analytical laboratories. Therefore, it is essential to develop an efficient and low-cost field analytical method for rapidly naphthenic acids quantify. In this study, nitrogen-rich carbon quantum dots (N-CQDs) based on natural deep eutectic solvents (NADESs) was successfully synthesized by a one-step solvothermal method. The fluorescence property of carbon quantum dots was used to achieve the quantitative detection of naphthenic acids in wastewater. The prepared N-CQDs showed excellent fluorescence and stability, showed a good response to naphthenic acids and a linear relationship in the concentration range of naphthenic acids from 0.03 to 0.09 mol‧L −1 . The effect of common interferents in petrochemical wastewater on the detection of naphthenic acids by N-CQDs was investigated. The results showed that N-CQDs had good specificity for the detection of naphthenic acids. N-CQDs was applied to the naphthenic acids wastewater, and the concentration of naphthenic acids in the wastewater was successfully calculated according to the fitting equation.
研究领域:
环境科学
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分析化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF FLUORINE CHEMISTRY
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2021
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IF 2.05
Nianze Song,Xin Huang,Yifei Li,Kaokao Zhang,Chaihui Wei,Jian Zhang,Yue Zhang
ABSTRACT To deal with the demulsification of emulsion stabilized by naphthenic compounds, a series of multibranched–linear–multibranched (MLM) copolymer were designed and synthesized. The hydrophilic core with MLM structure is constructed by anionic ring-opening multibranching polymerization (ROMBP) of glycidol with poly (ethylene glycol). The amphophobic arms are grafted by atom transfer radical polymerization (ATRP) of 2, 2, 2-trifluoroethyl methacrylate (TFEMA). The demulsification performance of the MLM copolymer in n-octane/water emulsion stabilized by naphthenic acids (NAs) and sodium naphthenates (Na-NAs) were evaluated. The influences of copolymer dosage, temperature and Na-NAs/NAs ratio on the demulsification efficiency were investigated in detail. Compared with the blank sample settled for 90 min, the fluorinated MLM copolymer with medium HLB value promoted the demulsification efficiency from 50% to 92%. By analyzing the correlation between the polymer structure and demulsification performance, it can be considered that the PEG segment improved the low solubility of the fluorinated copolymer caused by the solvophobic nature of fluorinated groups. The amphophobic effect of the fluorinated group not only accelerates the diffusion process of polymer molecules from the bulk to the interface, but also reduces the rigidity of the interface film by repelling the original interface active material, and produces effective demulsification.
研究领域:
化学工程
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材料科学
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产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2024
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IF 8.2
Hongwei Ren,Ruoyao Zhang,Yi Zheng,Yize Liu,Qiuya Zhang,Juan Zhang,Chunmao Chen,Erhong Duan
Treatment of naphthenic acids (NAs) in wastewater is necessary due to its high toxicity and difficult degradation. In the heterogeneous Fenton-like advanced oxidation of organic pollutant system, the insufficient accessibility of oxidizing agent and NAs greatly hamper the reaction efficiency. CO 2 -responsive phase transfer materials derived from polyethylene glycol (PEG)-based deep eutectic solvents were specific targeted at the immiscible-binary phase system. The NAs oxidative degradation process was optimized including the kinds of catalyst (Molecular weight of PEG, constitute of DESs, and dosage.), temperature, flow rate of CO 2 , et al. With the help of fluorescence properties of catalyst, the hydrophilic-hydrophobic interaction was visual-monitored and further studied. The amphipathic property of PEG-200/Sodium persulfate/Polyether amine 230 (PEA230) greatly reduced the aqueous/organic phase transfer barrier between sodium persulfate and NAs (up to 84 %), thus accreting oxidation rate . The surface tension decreased from 35.364 mN/m to 28.595 mN/m. To control the reaction rate, the CO 2 respond structure of amido played an important role. In addition, the interfacial transfer intermediates and oxidation pathways were also explored by nuclear magnetic resonance , flourier transform infrared spectroscopy, surface tension, and radical inhibition experiments. The mechanism of advanced oxidation of NAs catalyzed by CO 2 -responsive phase transfer catalyst was proposed, which would made up for the deficiency of the system theory of heterogeneous chemical oxidation of organic pollutants.
研究领域:
环境科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
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2023
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IF 8.8
Lingfei Liu,Mingshan Zhang,Yi Lu,Gaojian Chen,Binda Lu,Lingling Ge,Zhouguang Lu,Dejun Sun,Zhenghe Xu
CO 2 -responsive microemulsion (ME) is considered a promising candidate for deep-cleaning and oil recovery from oil-contaminated soils. Understanding the responsive nature of different microstructures ( i.e. , oil-in-water (O/W), bicontinuous (B.C.) and water-in-oil (W/O)) is essential for unlocking the potential and mechanisms of CO 2 -responsive emulsions in complex multiphase systems and providing comprehensive guidance for remediation of oil-contaminated soils. Herein, the responsiveness of microstructures of ME to CO 2 trigger was investigated using experimental designs and coarse-grained molecular dynamic simulations. MEs were formed for the first time by a weakly associated pseudo-Gemini surfactant of indigenous organic acids (naphthenic acids, NAs are a class of natural surface-active molecules in crude oil) and tetraethylenepentamine (TEPA) through fine tuning of co-solvent of dodecyl benzene sulfonic acid (DBSA) and butanol. The O/W ME exhibited an optimal CO 2 -responsive character due to easier proton migration in the continuous aqueous phase and more pronounced dependence of configuration on deprotonated NA ions. Conversely, the ME with W/O microstructure exhibited a weak to none responsive characteristic, most likely attributed to its high viscosity and strong oil-NA interactions. The O/W ME also showed superior cleaning efficiency and oil recovery from oil-contaminated soils. The results from this study provide insights for the design of CO 2 -responsive MEs with desired performance and guidance for choosing the favorable operating conditions in various industrial applications, such as oily solid waste treatment , enhanced oil recovery (EOR), and pipeline transportation. The insights from this work allow more efficient and tailored design of switchable MEs for manufacturing advanced responsive materials in various industrial sectors and formulation of household products.
研究领域:
环境科学
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化学工程
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材料科学
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表面化学
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DOI
PubMed
高影响因子
ENVIRONMENTAL POLLUTION
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2016
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IF 4.839
Naling Bai,Rexiding Abuduaini,Sheng Wang,Meinan Zhang,Xufen Zhu,Yuhua Zhao
Nonylphenol (NP), ubiquitously detected as the degradation product of nonionic surfactants nonylphenol polyethoxylates, has been reported as an endocrine disrupter . However, most pure microorganisms can degrade only limited species of NP with low degradation efficiencies. To establish a microbial consortium that can effectively degrade different forms of NP, in this study, we isolated a facultative microbial consortium NP-M2 and characterized the biodegradation of NP by it. NP-M2 could degrade 75.61% and 89.75% of 1000 mg/L NP within 48 h and 8 days, respectively; an efficiency higher than that of any other consortium or pure microorganism reported so far. The addition of yeast extract promoted the biodegradation more significantly than that of glucose. Moreover, surface-active compounds secreted into the extracellular environment were hypothesized to promote high-efficiency metabolism of NP. The detoxification of NP by this consortium was determined. The degradation pathway was hypothesized to be initiated by oxidization of the benzene ring, followed by step-wise side-chain biodegradation. The bacterial composition of NP-M2 was determined using 16S rDNA library, and the consortium was found to mainly comprise members of the Sphingomonas , Pseudomonas , Alicycliphilus , and Acidovorax genera, with the former two accounting for 86.86% of the consortium. The high degradation efficiency of NP-M2 indicated that it could be a promising candidate for NP bioremediation in situ .
研究领域:
环境微生物学
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生物修复
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微生物生态学
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DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2021
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IF 10.588
Mengqi Zheng,Hongjun Han,Jingxin Shi,Zhengwen Zhang,Wencheng Ma,Chunyan Xu
In current study, nano-Fe 3 O 4 @activated coke enhanced bio-system (FEBS) under limited-oxygen condition was applied for efficient treatment of aromatic organics in coal pyrolysis wastewater. Metagenomic analyses revealed functional microbiome linkages and mechanism involved in aromatic ring-cleavage. Based on biodegradation efficiency in different reactors, FEBS supplementation conferred the best organic removal (avg. 92.29%). It also showed a remarkable advantage in biodegradability maintenance (> 40%) over control reactors. Metagenomics profiling revealed the degradation processes were driven by Fe 3 O 4 redox reactions and microbial biofilm, while the suspended sludge was the principal force for aromatic mineralization . Based on the analysis of functional species and genes, most bacteria cleaved the benzene ring preferably through the aerobic pathways, mediated by catechol 1, 2-dioxygenase, catechol 2, 3-dioxygenase and protocatechuate 3, 4-dioxygenase (66−84%). Ecological network showed that Comamonas testosterone -centered microbiome and Azotobacter linked to the nitrogen (N)-heterocyclic ring-cleavage. Network linkage further demonstrated that Alicycliphilus and Acidovorax were the key tone taxa involved in benzene ring-cleavage. Finally, combined with analysis of degradation products , bacteria degraded N-heterocyclic ring containing organic aromatic compounds (quinoline) mainly through anaerobic processes , whereas cleavage of benzene ring preferred aerobic pathways. The enriched functional species were the primary reason for the enhanced biodegradation in FEBS.
研究领域:
环境工程
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微生物学
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宏基因组学
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废水处理
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DOI
PubMed
高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
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2023
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IF 6.8
Huanxin Zhang,Panpan Si,Qiang Kong,Jinyue Ma
Naphthenic acids (NAs) are typical contaminants in heavily crude oil. Benzo[ a ]pyrene (B[ a ]P) is also a component of crude oil, but their combined effects have not been systematically explored. In this study, zebrafish ( Danio rerio ) were used as the test organisms, and behavioral indicators and enzyme activities were used as toxicity indicators. Combined with the effects of environmental concentrations, the toxic effects of low concentrations of commercially available NAs (0.5 mg/LNA) and benzo[ a ]pyrene (0.8 μg/LBaP) at single and compound exposures (0.5 mg/LNA and 0.8 μg/LBaP) were assayed in zebrafish, and transcriptome sequencing technology was used to explore the molecular mechanism of the two compounds affecting zebrafish from the molecular biology level. Sensitive molecular markers that could indicate the presence of contaminants were screened. The results showed that (1) zebrafish in the NA and BaP exposure groups exhibited increased locomotor behavior, and the mixed exposure group exhibited inhibition of locomotor behavior. Oxidative stress biomarkers showed increased activity under single exposure and decreased activity under the mixed exposure. (2) NA stress led to changes in the activity of transporters and the intensity of energy metabolism; BaP directly stimulates the pathway of actin production. When the two compounds are combined, the excitability of neurons in the central nervous system is decreased, and the actin-related genes are down-regulated. (3) After BaP and Mix treatments, genes were enriched in the cytokine-receptor interaction and actin signal pathway, while NA increased the toxic effect on the mixed treatment group. In general, the interaction between NA and BaP has a synergistic effect on the transcription of zebrafish nerve and motor behavior-related genes, resulting in increased toxicity under combined exposure. The changes in expression of various zebrafish genes are manifested in the changes in the normal movement behavior of zebrafish and the intensification of oxidative stress in the apparent behavior and physiological indicators. Capsule abstract We investigated the toxicity and genetic alterations caused by NA, B[ a ]P, and their mixtures in zebrafish in an aquatic environment using transcriptome sequencing technology and comprehensive behavioral analysis. These changes involved energy metabolism, the generation of muscle cells, and the nervous system.
研究领域:
环境科学
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毒理学
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分子生物学
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基因组学
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水生生物学
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产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2026
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IF 3.9
Xinyu Lv,Peng Wei,Xueying Wang,Hui Sun
In situ emulsification is a promising enhanced oil recovery technique but faces challenges including environmental concerns and high operational costs. To address this, we developed amphiphilic nitrogen-doped carbon dots (NCDs) via a facile one-pot synthesis. The NCDs exhibit high interfacial activity and undergo a three-step self-assembly with endogenous naphthenic acids in crude oil─via hydrophobicity-driven diffusion, electrostatic adsorption, and interfacial jamming─to form a rigid film with ultralow interfacial tension (∼0.66 mN/m). The resulting emulsion shows a bridged network structure and high stability. Microfluidic experiments reveal that stable oil-in-water emulsions form over a wide concentration range, with three distinct flow regimes (squeezing, dripping, and jetting) governed by capillary number and droplet size scaling as (D/Dh) ∝ Cac–1.5. The emulsion also exhibits fully reversible, CO2-responsive demulsification with minimal NCDs loss over cycles. Under simulated reservoir conditions, NCDs maintain ultralow tension and high elasticity in heavy oil, show good thermal and salinity stability, and enhance oil recovery by 33.45% over water flooding, demonstrating strong field potential. This work offers a sustainable strategy for developing efficient oilfield chemicals with lower cost and environmental impact.
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Xiaopeng Jin,Manxing Huo,Qifeng Wei,Xiulian Ren
The separation of aluminum and manganese from mineral leach solutions has been a challenge at present and has attracted great interest. In this paper, the effects of different extractants on aluminum recovery as well as the effects of the concentration of the most suitable extractant, extraction temperature, initial pH and organic phase/aqueous phase ratio on the recovery of aluminum were investigated. The results showed that for chromite recovery solution(CRS) with an initial aluminum concentration of 0.1221 g/L, S-NA at 0.25 mol/L exhibited good selectivity and extraction efficiency for aluminum, and was able to separate aluminum from other elements and recover it easily for secondary use without scrubbing. The extraction mechanism of aluminum in sulfuric acid medium was investigated through various analyses including the combination of energy and bond length calculations, electrostatic potential (ESP) theory calculations, IGMH analysis, process chemistry analysis, and thermodynamic equilibrium species calculations. These analyses showed that Al(III) was distributed in the recycling solution in the form of AlSO 4 + and had strong interactions with naphthenate ions, and that the combination of AlSO 4 + with the naphthenate ions(R − )’s formed the stable complex molecule AlSO 4 R. The study provides a feasible path for the recovery of aluminum in CRS and is of guiding significance for the theoretical study of aluminum in sulfuric acid media.
研究领域:
化学工程
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材料科学
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产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
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2022
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IF 9.224
Jiaqi Wang,Kaihui Cui,Haitao Zhou,Kun Huang
A novel environmentally friendly strategy based upon bubble-supported organic liquid membrane (BSOLM) extraction using saponified naphthenic acid as extractant is proposed in the present work for treating the in situ leaching solutions of ion-adsorption type yttrium-rich heavy rare-earth ores in South China. It was revealed that selectively preferential separation of non-yttrium rare earths from yttrium can be achieved, while the electrolyte aluminum salt can be retained in the raffinates for subsequent return as the leaching reagent for performing in situ leaching of ion-adsorption type heavy rare-earth ores. The BSOLM extraction exhibits an obvious advantage over conventional extraction in promoting the competitive mass transfer and separation of coexisting rare earths from yttrium and other non-rare-earth impurity ions. Using erbium as a representative of heavy rare earths, it was found that the differences in diffusive mass transfer rate of Er3+, Y3+, and Al3+ ions in the boundary layer of laminar flow near the surface of the extractant liquid membrane result in their enhanced separation. The BSOLM extraction prevents the convective disturbance along the normal vertical direction of the interface due to the irregular movement of dispersed oil droplets in the conventional extraction and therefore inhibit the co-extraction of Al3+ ions. The effects of Al3+ ion concentrations in aqueous feed solutions, initial aqueous pHs, concentrations of naphthenic acid, and its saponification degree on the separation efficiency were investigated. Experimental results confirmed that competitive hydration and adsorption of Al3+ ions at the interface play an important role in increasing the difference in concentration distribution of Er3+ and Y3+ ions near the interface during BSOLM extraction; therefore, the separation of rare earths from yttrium can be controllable.
研究领域:
环境科学
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化学工程
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材料科学
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矿物加工
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）