Acta Metallurgica Sinica-English Letters
·
2022
·Vol. 35
·期 10
·1653-1664
·
IF 3.024
Xie Shenghui,Liao Xiang,Zeng Xierong,Yang Haipeng,He Liang
High-entropy alloys (HEAs) have attracted widespread attention due to their excellent mechanical properties. However, their functional properties arising from the supersaturated solid solution state can be improved. Advanced oxidation processes (AOPs) are considered to be an effective method for decomposing organic pollutants, and HEAs are proposed as effective candidates for AOP catalysts. Currently, several HEAs used for organic pollutant degradation are prepared through mechanical alloying. In this work, FeAlCoNi and FeAlCoNiB Fenton-like catalysts were prepared by single roll melt spinning and subsequent ball milling techniques. We found that the FeAlCoNiB HEA exhibits highly efficient degradation for p -nitrophenol ( p -NP). The degradation efficiency of FeAlCoNiB is 120 times higher than that of FeAlCoNi, which confirms that boron functions effectively during the degradation process. FeAlCoNiB has a better degradation efficiency than pure iron powder and a degradation efficiency comparable to that of the amorphous Fe 78 Si 11 B 11 alloy. Additionally, the degradation efficiency of FeAlCoNiB X increases ( k values from 0.13 to 0.55 min −1 ) when the boron content increases from an X value of 0.25 to 1.25. We speculate that Fe 2 B favors the degradation process and promotes zero-valent iron to decompose organic pollutants through a galvanic cell effect. Possible p -NP degradation pathways are proposed after LC–MS analysis. This study provides a new series of HEA Fenton-like catalysts, which have the potential to be prepared into bulk devices for industrial applications.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
·
2023
·
IF 1.2
Quan-Xing MAO,Jun-Na YANG,Xi WU,Yang FU,Xi-Ming SONG,Tian-Yi MA
There are various kinds of pollutants in our environment from the discharged sewage that damage human’s health. Determination of multiple pollutants is important for safety and the detection methods are always needed. This study reports a determination method for p -nitrophenol ( p -np) and copper ions by using the dual fluorescence centers of N,S co-doped CDs (N,S-CDs). N,S-CDs was prepared by hydrothermal treatment of thiourea and citric acid in N N dimethylformamide. The as-prepared N,S-CDs are spherical particles with size distribution of 1.20±0.42 nm, as well as functional groups such as thiol and carboxyl. The rich surface species endow the CDs dual fluorescence centers at 380 nm/460 nm and 550 nm/625 nm. Interestingly, the fluorescence at 380 nm/460 nm can be quenched by p -np, while the fluorescence at 550/625 nm can be quenched by copper ions. Mechanism investigations revealed that inner filter effect of p -np and combination with copper ions are responsible for the fluorescence quenching. Determination methods are thus found with detection limits of 6.47×10 −6 mol L − 1 for p -np and 6.0×10 −7 mol L − 1 for Cu 2+ . Piped water are tested and the results are satisfactory with recoveries in the range of 94.33%—100.67% for p -np and 98.67%—106.33% for Cu 2+ . In conclusion, this work provides a new approach for determination of multiple targets by using the dual fluorescence of N,S-CDs.
研究领域:
环境科学
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分析化学
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DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 35
·20323-20331
·
IF 3.049
Jiangkun Du,Yang Wang,Faheem,Tiantian Xu,Han Zheng,Jianguo Bao
H2O2 and persulfate (PDS) activated by iron are attracting much attention due to their strong oxidation capacity for the effective degradation of organic pollutants. However, they face problems such as requiring an acidic reaction pH and difficulty of Fe2+ regeneration. In this study, the simultaneous activation of H2O2 and persulfate by nanoscaled zero valent iron (nZVI) was investigated for the degradation of p-nitrophenol (PNP). The nZVI/H2O2/PDS oxidation system exhibited significantly higher reactivity toward PNP degradation than the systems with a single oxidant. A synergistic effect was explored between H2O2 and PDS during nZVI-mediated activation, and the molar ratio of H2O2/PDS was a key parameter in optimizing the performance of PNP degradation. The nZVI/H2O2/PDS system could function well in a wide pH range, and even 95% PNP was removed at an initial pH 10, thus markedly alleviating the pH limitations of Fenton-like processes. Both hydroxyl radicals and sulfate radicals could be identified during H2O2/PDS activation, in which H+ produced during PDS decomposition promoted H2O2 activation. The increase of oxidant concentration could significantly enhance the PNP degradation, while the presence of HCO3− and HPO42− exerted great inhibition. Furthermore, five degradation intermediates of PNP were detected and its degradation pathways in the nZVI/H2O2/PDS system were presented. This study reveals that the simultaneous activation of H2O2 and PDS by nZVI is a promising advanced oxidation tool as an alternative to typical Fenton processes for recalcitrant pollutant removal.
研究领域:
环境科学
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化学工程
✓ 已验证
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2019
·
IF 6.044
Shuangyu Xiong,Luminita Marin,Lian Duan,Xinjian Cheng
Nitroaromatic compounds, especially 2, 4, 6-trinitrophenol, have strong biological toxicity and explosive risks, so the detection of 2, 4, 6-trinitrophenol exhibit importantly practical and scientific significance. In this work, three fluorescence functionalized chitosan CNS 3 , CNS 4 and CNS 5 were prepared using chitosan as matrix. When 2, 4, 6-trinitrophenol (TNP) and/or p-nitrophenol (4-NP) was present in spot, these fluorescent chitosan sensors produced notable fluorescence quenching. It renders the chitosan sensing ability to detect TNP and 4-NP selectively and sensitively. The sensing mechanism is investigated as well. When introduced electron-rich moieties to the fluorescent chitosan, the sensitive detecting ability could be obtained. Excellent recognition ability could reach as low as 0.28 μM. The fluorescence fictionalization cause slight influence to the gel performance of chitosan.
研究领域:
分析化学
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环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Gang Chu,Wangmin Wang,Yang Dou,Kai Sun,Wenxiu Qin,Zhen Wang,Youbin Si
Pyrogenic carbon (PC) including black carbons and engineered carbons can mediate the extracellular electron transfer to facilitate the biogeochemical reaction with organic pollutants. Yet, the role of carbon structures and iron minerals on PC-mediated microbial degradation is still lacking of understanding. Herein, we studied the electrochemical properties of PCs produced from varied feedstock with regards to the mediated degradation of p -nitrophenol (PNP) by Shewanella putrefaciens CN32 in anoxic system. Mediated degradation by PCs was enhanced by facilitating extracellular electron transfer through oxygenated group and graphitic structure. Graphitic crystallites improved the electron-accepting capacity (as suggested by I D /I G and EAC) and diminished the electrochemical impedance (as suggested by Rct), contributing to PNP degradation under the anoxic system. Furthermore, more interfacial adsorption was conducive to the mediated reduction by the graphitic structure on PCs of high-temperature. In the presence of iron minerals, both hematite and goethite significantly facilitated PC-mediated degradation, which could be ascribed to the enhancement of the electron-donating capacity of microorganism and the accumulation of the reductive-state PCs by the interaction with generated Fe(II). This work paves a feasible way to the technical design on the remediation of phenolic contaminants by PC-mediated microbial degradation in environment.
研究领域:
环境科学
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微生物学
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产品关联
DOI
PubMed
高影响因子
Science of Advanced Materials
·
2021
·Vol. 13
·期 12
·2450-2459
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IF 1.474
Tan Xin,Zheng Zhijie,Peng Bo,Wu Xiaogang,Huang Xiangyang,Chen Xiaofei
Ti/RuO2–IrO2 electrode was used in this study as an anode, while titanium plate (Ti) was used as a cathode for electrochemical oxidation process, to explore the influences of related parameters on degradation of p-nitrophenol (PNP) and removal of Cu2+
from mixed simulated wastewater. Using a single chamber reactor, we tested the influence of various factors on the PNP degradation and Cu2+ elimination. The factors that were tested are as follow; the type of electrolyte, density of the current, various values of pH and different
concentrations of Cu2+. Furthermore, a dual-chamber diaphragm reactor compartmentalized by cationic membrane was utilized to explore the removal mechanism of PNP and Cu2+. Results showed that, treatment of PNP-Cu2+ simulated wastewater, with NaCl as electrolyte,
had a better effect compared with Na2SO4, which had characteristics such as shorter reaction time and higher degradation efficiency for PNP. Removal of Cu2+ had no obvious advantage over Na2SO4. The degradation of PNP and removal of Cu2+
were improved with increased current density when the rang was increased from 10 to 40 mA/cm2. Cu2+ concentration when increased initially promoted the degradation of PNP. At the same time, Cu2+ acted as electron acceptor at the cathode that slowed down the
consumption of H+ through reduced combination of H+ with electrons. The degradation rate of PNP decreased with increased initial pH, but the Cu2+ was opposite. In this experiment, the degradation of PNP was positively correlated with indirect oxidation of active
chlorine, and the Cu2+ was removed by cathodic electrodeposition.
研究领域:
环境科学
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化学工程
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
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2019
·
IF 5.108
Yusi Tian,Minghua Zhou,Yuwei Pan,Jingju Cai,Gengbo Ren
Pre-magnetized Fe 0 (Pre-Fe 0 ) was for the first time applied as heterogeneous catalyst to enhance the oxidation efficiency of electro-Fenton (EF) for the degradation of p -nitrophenol (PNP). The parameters including current, initial pH and pre-Fe 0 dosage of Pre-Fe 0 /EF process were optimized and compared with other two processes (conventional Fe 0 /EF and electro-oxidation) to confirm its advantage. The rate constants of PNP removal were 1.40–3.82 folds of those by Fe 0 /EF process under various experimental conditions. The application of pre-Fe 0 as catalyst could extend the working pH range from 3.0 to neutral conditions for PNP removal and reduce the Fe 0 dosage from 2 to 0.5 mM corresponding to Fe 0 /EF, avoiding the second pollution of iron sludge . The superiority of Pre-Fe 0 /EF process was also verified to improve the degradation and mineralization of other phenols and antibiotics. Furthermore, a possible pathway of PNP degradation was revealed by the identification of intermediates and organic acids, and the possible mechanism of pre-Fe 0 efficiently enhanced the EF efficiency was proposed. This work demonstrated that such a novel heterogeneous EF process using pre-Fe 0 catalyst was clean and promising for the degradation of refractory organic pollutants .
研究领域:
环境科学
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化学工程
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2016
·Vol. 27
·期 14
·145701
·
IF 3.573
Yong Zuo,Ji-Ming Song,He-Lin Niu,Chang-Jie Mao,Sheng-Yi Zhang,Yu-Hua Shen
P-nitrophenol (4-NP) and hydrazine hydrate are considered to be highly toxic pollutants in wastewater, and it is of great importance to remove them. Herein, TiO2-loaded Co0.85Se thin films with heterostructure were successfully synthesized by a hydrothermal route. The as-synthesized samples were characterized by x-ray diffraction, x-ray photoelectron spectroscopy, transmission electron microscopy and selective-area electron diffraction. The results demonstrate that TiO2 nanoparticles with a size of about 10 nm are easily loaded on the surface of graphene-like Co0.85Se nanofilms, and the NH3 · H2O plays an important role in the generation and crystallization of TiO2 nanoparticles. Brunauer–Emmett–Teller measurement shows that the obtained nanocomposites have a larger specific surface area (199.3 m2 g−1) than that of Co0.85Se nanofilms (55.17 m2 g−1) and TiO2 nanoparticles (19.49 m2 g−1). The catalytic tests indicate Co0.85Se–TiO2 nanofilms have the highest activity for 4-NP reduction and hydrazine hydrate decomposition within 10 min and 8 min, respectively, compared with the corresponding precursor Co0.85Se nanofilms and TiO2 nanoparticles. The enhanced catalytic performance can be attributed to the larger specific surface area and higher rate of interfacial charge transfer in the heterojunction than that of the single components. In addition, recycling tests show that the as-synthesized sample presents stable conversion efficiency for 4-NP reduction.
研究领域:
材料科学
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环境科学
·
化学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Yujie Liu,Yuting Jiang,Yan Meng,Weini Xiong,Ziling Yuan,Ruihua Liu,Chao Yang
Because the interactions among contaminants may lead to enhanced toxicity, combined pollution caused by the co-presence of multiple contaminants has increasingly gained public concern. p -Nitrophenol (PNP) and 1,2-dichloroethane (1,2-DCA) are frequently co-detected in groundwater. To completely eliminate PNP, 1,2-DCA and intermediates from polluted sites, in this study, a novel degrader KTU-PDG was created by functional assembly of PNP and 1,2-DCA biodegradation pathways in a robust chassis Pseudomonas putida KT2440. Cell growth assay indicated that PNP or 1,2-DCA can be metabolized as a sole carbon source by strain KTU-PDG for cell proliferation. Stable isotope analysis indicated that strain KTU-PDG possesses the capability of co-mineralizing PNP and 1,2-DCA to CO 2 in mineral salt medium. In wastewater bioremediation, the strain KTU-PDG was proven to be capable of co-mineralizing PNP and DCA and maintained high cell viability during bioremediation. Herein, we demonstrate for the first time co-mineralization of PNP and 1,2-DCA by a single strain. Moreover, green fluorescent protein (GFP)-labeling of strain KTU-PDG facilitates estimation of viable cell number and real-time monitoring of cellular activity and transfer by autofluorescence in the environment. These merits of strain KTU-PDG highlight great potential of this degrader for in situ bioremediation of sites co-contaminated with PNP and 1,2-DCA. More importantly, this strategy of multi-pathways assembly in an optimal chassis shows good potential for the clean-up of combined pollution caused by other organic pollutants.
研究领域:
环境科学
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微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Shuxin Wei,Sibo Chen,Hang Yan,Xiaoran Zhang,Xinyue Gao,Zhongli Cui,Yan Huang
A common aromatic and phenolic pollutant, p-nitrophenol (PNP), is widely used in various industry and has serious risk to the environmental health. Biosensors have been extensively employed as an alternative technology for pollutants monitoring. By mining the new sensing elements, more specific biosensors could be characterized for highly sensitive detection. Herein, the PnpR transcription factor was identified to activate the transcription of pnpC1 by binding to P pnpC1 promoter region in P. putida DLL-E4, and PNP was recognized as its specific inducer. The PnpR-based biosensor for detection of PNP was developed, demonstrating adequate sensitivity in a liquid solution with satisfactory specificity. The biosensor was optimized by adopting a transcriptional amplifier, which increased the maximum output by 149-fold, and improved the detection limit by 100-fold, from 1 mg/L to 10 μg/L. These biosensors had a linear range of 5–80 mg/L and 0.01–1.0 mg/L for PNP determination, respectively. Then, the agarose gel entrapment-based biosensor was constructed and allowed a good of PNP detection in the range of 5–60 mg/L in M9 solid agar within 70 min, and a detection sensitive of 16.8 mg/kg in soil. The good performance of the biosensor suggested its potential application of high-efficient and on-site detection in environmental matrices.
研究领域:
环境科学
·
分子生物学
✓ 已验证
DOI
PubMed
高影响因子
ANALYTICA CHIMICA ACTA
·
2018
·
IF 5.123
Guobin Mao,Qin Zhang,Yeling Yang,Xinghu Ji,Zhike He
Alkaline phosphatase (ALP) is a universal and important hydrolase that has been proved to be associated with several diseases. Herein, a simple and effective method was proposed for ALP detection based on the inner filter effect of p-nitrophenol (pNP) on the fluorescence of CdTe/CdS quantum dots (QDs). For the preparation of CdTe/CdS QDs, Na 2 TeO 3 was used as the Te source, and dithiol as the S source and surface ligand. The as-prepared CdTe/CdS QDs show good fluorescence properties, such as high quantum yield (∼80%), and good chemical/photo-stability. pNP is a hydrolysate of p-nitrophenol phosphate disodium salt under the catalysis of ALP, which could effectively quench the fluorescence of QDs due to the absorption spectra of pNP overlaps well with the excitation spectra of the CdTe/CdS QDs. Therefore, the prepared CdTe/CdS QDs could be applied for ALP detection. A good linear relationship ranging from 2.2 to 220 U/L was obtained with the limit of detection as low as 0.34 U/L. In addition, this method was successfully applied for the assay of ALP in human serum with the satisfactory results.
研究领域:
生物化学
·
医学检测
·
纳米材料
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Yu Chen,Senqing Fan,Boya Qiu,Jiaojiao Chen,Yangmei Qin,Yilin Wang,Zeyi Xiao,Zenghui Mai,Ke Bai,Jingyun Liu
A catalytic membrane microreactor (CMMR) was fabricated by immobilizing ZIF-8-derived nano-Ag in membrane pores via ion exchange. ZIF-8 was first in situ assembled in polyethersulfone (PES) membrane pores with polydopamine modification. The Zn–N bond disappeared and Ag–N bond appeared after ion exchange by a AgNO3 solution. Besides, the X-ray diffraction (XRD) characteristic peaks of ZIF-8 transformed into those of the Ag–MI coordination compounds. The Ag–N bond disappeared and the characteristic peaks of Ag appeared after reduction by a NaBH4 solution. It could be observed by transmission electron microscopy (TEM) that the size of nano-Ag was 4.55 ± 1.67 nm, which was one-fifth of that without ZIF-8 as a precursor. The inductively coupled plasma emission spectroscopy (ICP-OES) test revealed that the loading capacity of nano-Ag in PES membrane pores was 31.33%. The degradation of p-nitrophenol (p-NP) was applied to test the catalytic performance of the CMMR, and the apparent reaction rate constant could be increased by 2 orders of magnitude.
研究领域:
材料科学
·
催化化学
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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）