SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Mian Hu,Xiaotong Huang,Letao Sun,Weicheng Zheng,I-Ming Chou,Libo Wu,Jinling Wan,Zhiyan Pan,Junliang Wang
Catalytic oxidation of o -chloroaniline ( o- ClA) in hot compressed water (HCW) was investigated in a fused quartz tube reactor (FQTR) to determine the effects of catalyst, temperature, oxygen stoichiometric ratio (OSR) and reaction time on o- ClA mineralization, total nitrogen (TN) removal rate and nitrogen-containing products distribution. The results showed that o -ClA can be effectively degraded in HCW. With the increased of OSR, retention time and temperature or added of Mn 2 O 3 as catalyst, the mineralization rate of o -ClA and the removal rate of TN increased. Ammonia-N was the main nitrogen-containing intermediate product of o -ClA degradation, however, when the oxidant was excessive, ammonia-N was oxidized to form nitrate-N. Althought the catalytic effect of Mn 2 O 3 on the mineralization of o -ClA was not outstanding, it promoted the removal of ammonia-N from the benzene ring, improved the degradtion of ammonia-N, and inhibited the production of nitrate-N. GC–MS analyzed results indicated that o -chlorophenol was the main degradation intermediate product of o -ClA in HCWO process. Meanwhile, the potential degradation pathway of o -ClA was proposed. This work thus provides basic knowledge about o -ClA catalytic oxidation removal in HCW process.
研究领域:
环境科学
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化学工程
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DOI
高影响因子
KOREAN JOURNAL OF CHEMICAL ENGINEERING
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2014
·Vol. 31
·期 12
·2192-2197
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IF 1.241
Anjum Muhammad Naveed,Zia Khalid Mahmood,Zhu Lihua,Haroon-ur-Rashid,Ahmad Mirza Nadeem,Zuber Mohammad,Tang Heqing
Self-assembled hollow microspheres poly( o -chloroaniline) (POC) have been synthesized by simple oxidative polymerization of o -chloroaniline using camphor-sulfonic acid (CSA) as dopant acid and ammonium persulfate (APS) as oxidant. The POC microspheres were characterized by means of FTIR, XRD and SEM analysis. Adsorption characteristics of POC spheres were studied by using methyl orange (MO) as adsorbate. It was found that adsorption of MO by POC was better described by pseudo-second-order kinetics than any other kinetic model, such as the pseudo-first-order and intra-particle diffusion models. Langmuir adsorption isotherm model was the best to fit experimental data. The results showed that hollow microspheres of POC can be used as novel and low-cost adsorbent for removal of organic dye from waste water.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
CHEMOSPHERE
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2023
·
IF 8.8
Mian Hu,Zhibing Li,Xiaotong Huang,Meiqi Chen,Zhong-Ting Hu,Suqin Tang,I-Ming Chou,Zhiyan Pan,Qi Wang,Junliang Wang
To ascertain the reaction variables on o -chloroaniline ( o -ClA) mineralization, total nitrogen (TN) removal rate, and N-species distribution, o -ClA was subjected to catalytic supercritical water oxidation (CSCWO) in a fused quartz tube reactor (FQTR). The findings demonstrated that when the temperature, reaction time, and excess oxidant were 400 °C, 90 min, and 150%, respectively, the mineralization rate of o -ClA could reach more than 95%. Moreover, potential degradation pathways of o -ClA in supercritical water oxidation (SCWO) was proposed according to the GC-MS results. TN removal rate is significantly impacted by Ru/rGO, despite the fact that its catalytic effect on the mineralization of o -ClA was not particularly noteworthy. Compared with no catalyst, the TN removal rate of o -ClA obviously increased from 44.1% to 90.3% at 400 °C, 10 wt% Ru loading, 90 min and 200% excess oxidant. In addition, N-species distribution in SCWO and CSCWO were also investigated. Results indicated that the Ru/rGO catalyst could accelerate the oxidation of ammonia-N and convert it to nitrate-N, promoting N 2 generation. Finally, the possible N transformation pathway in CSCWO of o -ClA was proposed. As a result, this work offers fundamental information about o -ClA catalytic oxidation removal in the SCWO process.
研究领域:
环境科学
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催化化学
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产品关联
DOI
PubMed
高影响因子
CHEMISTRY OF MATERIALS
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2019
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IF 10.159
Yang Wang,Lianjie Ling,Wei Zhang,Jianping Guo,Kejian Ding,Wubiao Duan,Bo Liu
“Ship-in-bottle” strategy used for encapsulating small metal clusters into metal–organic frameworks (MOFs) has been well established in the past decades, whereas immobilizing shape-controllable metal nanocrystals’ (MNCs) which was expected to show “shape effects” in catalysis remains as a challenging work. Herein, by the new developed pore-expanding pattern of digging holes in the central of MOFs crystals to create mesopores-concentrated structure, a successful metal nanocrystal shapes manipulation (cubes, rods, triangular bipyramids, icosahedrons, truncated octahedrons, and concave cubes) in the cavities was accomplished. Meanwhile, the tight relations among MOFs internal space types, sizes, and the reduced MNCs’ location and shape evolutions in the encapsulation process were revealed for the first time. In catalyzing the reaction of hydrogenation of o-chloronitrobenzene to produce o-chloroaniline, the as-prepared shape-controllable MNCs@MOFs exhibited excellent synergistic effects on both raw materials conversion and byproducts inhabitation efficiencies.
研究领域:
材料科学
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纳米技术
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催化
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化学工程
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产品关联
DOI
高影响因子
NANOTECHNOLOGY
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2023
·Vol. 34
·期 14
·145704
·
IF 3.5
Jin Tan,Ling Lan,Yan-ni Wu,Song-bai Qiu
The graphene-like wrapped Ni@C catalysts were facilely synthesized by a modified sol–gel method. Nickel nitrate and citric acid (CA) were adopted as the raw materials to form sol–gel mixture. Under the circumstances, the additive CA were employed not only as a complexing agent but also as a carbon source. It is found that the calcination temperature and the mole ratios between Ni and CA are the key factors affecting the physical property and the catalytic performance of catalysts in the conversion of nitroarenes into corresponding anilines. The results show that the Ni@C-500(1:1) catalyst exhibited the best performance in the hydrogenation of o-chloronitrobenzenes (o-CNB) to o-chloroanilines (o-CAN). The yield of o-CAN was achieved at 100% when o-CNB was completely converted at 40.0 °C under 2.0 MPa H2 for 2.0 h. Furthermore, the Ni@C-500(1:1) catalyst could be separated and recovered easily after reaction by an external magnetic field. The investigated results indicate that the Ni@C-500(1:1) catalyst remained higher activity after using twelve times. More importantly, this kind of catalyst is also active for the selective hydrogenation of other nitroarenes into the corresponding anilines. This new synthetic method may pave a way for producing low-cost Ni@C catalysts on a large scale, which is attractive for industrial anilines applications.
研究领域:
化学工程
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材料科学
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催化
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有机化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Zhengkai Wu,Yunning Chen,Xueying Cheng,Renquan Guan,Shuyu Chen,Yingna Guo,Qingkun Shang
How to design and optimize the single-molecule structure of perylene diimide derivatives (PDIs) to obtain high-performance photocatalysts is one of the challenges facing the current research field of PDIs photocatalysis. In this article, we regulate the π-π self-assembly stacking and optoelectronic properties of PDIs by changing the type and position of substituents on the amide site. The PDI-PBA photocatalyst with excellent performance was obtained from seven types of PDIs supramolecular materials. Theoretical calculations and optoelectronic performance tests have shown that PDI-PBA has good crystallinity and maximum dipole moment, resulting in its maximum built-in electric field, effectively promoting the separation and transport of photo-generated carriers. The transient absorption spectra further indicate that photogenerated electrons and holes of PDI-PBA have outstanding separation efficiency and ultra-long lifetime. In the batch reactor, PDI-PBA can degrade almost 100% acetaminophen within 60 min. In the dynamic cycling system with a surface hydraulic load of 14.56 L/(m 2 ·h), the efficiency of PDI-PBA photocatalytic degradation of acetaminophen can reach 84%. PDI-PBA can also effectively degrade phenol, levofloxacin, and ciprofloxacin. This work provides a successful example for the design of novel and efficient PDIs supramolecular materials, and lays the foundation for the application of PDIs photocatalysts in practical wastewater treatment.
研究领域:
材料科学
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环境科学
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化学
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产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
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2024
·
IF 3.8
Yali Yang,Jia Chen,Xiaojing Liang,Bei Liu,Kaijun Quan,Xiuhui Liu,Hongdeng Qiu
In this paper, three imidazole- and C18- bifunctional silica stationary phases (Sil-Im-C18) were prepared by adjusting introduction interval of octadecyltrichlorosilane (ODS) and 3-imidazol-1-ylpropyl(trimethoxy)silane (TMPImS), which can be used for reversed-phase liquid chromatography (RPLC) and ion exchange chromatography (IEC) with adjustable performance. The successful preparation of Sil-Im-C18 were confirmed by the characterizations of elemental analysis, infrared spectroscopy (FTIR) and contact angle (CA). Chromatographic performance of Sil-Im-C18 were evaluated by the separation of Tanaka test mixture, alkylbenzenes, linear PAHs and a set of analytes with different properties (uracil, phenol, 1,2-dinitrobenzene and naphthalene), and compared with commonly used C18 column. It was found that the chromatographic performance of Sil-Im-C18 changed significantly with the difference in bonding amount of imidazole and C18. Sil-Im-C18 demonstrated the excellent separation performance towards polycyclic aromatic hydrocarbons (PAHs), phenylesters, phenylamines , phenols and inorganic anions, and notably, nucleobases and nucleosides can be separated using pure water as mobile phases . The van Deemter plot showed that the column efficiency of Sil-Im-C18-3 was 64,933 plate· m − 1 for naphthalene, indicated that Sil-Im-C18 was reasonably chromatographic columns. The RSD values of retention time were 0.22 %-0.61 % for 10 needles alkylbenzenes injected continuously at 50 °C to investigate thermal stability and repeatability, all the fluctuations of k of naphthalene were less than 2.3 % for Sil-Im-C18-1 during flushing 24 h with the mobile phase at different pH values (pH = 3 and 8), the retention time of alkylbenzenes were almost same for Sil-Im-C18-1 at different time, the RSD values of retention time of alkylbenzenes were 0.45 %-2.28 % for two batches Sil-Im-C18-1, revealing the excellent repeatability, thermal stability, durability and reproducibility of Sil-Im-C18, and implying a commercial prospect.
研究领域:
分析化学
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色谱技术
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产品关联
DOI
PubMed
高影响因子
Heliyon
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2024
·
IF 3.4
Min Hu,Wenhao Wu,Chenkai Zhou,Hongxia Zhu,Laigang Hu,Ling Jiang,Daohui Lin,Kun Yang
Returning carbon materials from biomass to soil is a potential technology to retard organic contaminants or dissolved organic matter (DOM) in soil by adsorption, as well as to store carbon in soil for carbon sequestration. However, DOM was widely reported to inhibit adsorption of organic contaminants on carbon materials by competition and by enhancing contaminants' solubility. In this study, a KOH activated carbon material (KAC), pyrolyzed from bamboo chips, with high surface area (3108 m 2 /g), micropores volumes (0.964 cm 3 /g), mesopores volumes (1.284 cm 3 /g), was observed that it can adsorb fulvic acid (FA) and organic contaminants (e.g., nitrobenzene, phenols, and anilines) simultaneously with weak competition and high adsorption capacity. With 50 mg TOC/L FA, for example, the average competition suppressing rate (Δ K f / K f-m ) of organic contaminants on KAC was lower than 5%, the adsorption for organic contaminants and FA were higher than 1100 mg/g and 90 mg TOC/g, respectively. The weak competition on KAC could be attributed to the low micropore blockage (<35%) and the weak adsorption sites competition on mesopores of KAC, as well as the minimal solubility enhancement of organic contaminants by FA because most FA is adsorbed on KAC but is not dissolved in the solution. In addition, adsorption of organic contaminants with high hydrogen-bonding donor ability ( α m ) and adsorption affinity was less suppressed by FA because of the heterogeneous nature of hydrophilic sites on KAC's surface. Therefore, KAC could be a potential carbon material to be produced to implement to soil for carbon storage and simultaneous retarding organic contaminants and DOM.
研究领域:
环境科学
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土壤科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
ENERGY
·
2024
·
IF 9
Mengjiao Fan,Xueming Gao,Yuewen Shao,Kai Sun,Yuchen Jiang,Shu Zhang,Yi Wang,Song Hu,Jun Xiang,Xun Hu
High nitrogen content in Spirulina platensis -derived bio-oil is a highly undesirable feature in upgrading of bio-oil to biofuel via hydrodeoxygenation . However, the nitrogen species could be potentially used as dopant for tailoring the catalytic behaviors of metallic sites in heterogeneous catalysts . In this study, the nitrogen species in the bio-oil from hydrothermal carbonization (HTC) of Spirulina platensis was used to modify Co-based catalyst for enhancing their catalytic activity for hydrogenation of o -chloronitrobenzene ( o -CNB). The results showed that the introduction of N species not only promoted dispersion of Co particles via formation of Co–N sites, but also generated extra pores and significantly increased H 2 uptake. The abundant Co–N sites, high dispersion of Co and higher surface area of N-doped catalyst (CoFeAl–N) jointly contributed to the enhanced catalytic activity for hydrogenation of o -CNB, achieving the yield of 90.3% for o -chloroaniline ( o -CA) and lowering the activation energy from 63.0 kJ mol −1 (with N-free CoFeAl catalyst) to 55.1 kJ mol −1 . The effectiveness of introducing nitrogen for enhancing catalytic activity for hydrogenation of o -CNB was also confirmed in the experiments for doping Co/Al 2 O 3 (prepared via impregnation) and CoAl (prepared via co-precipitation) catalysts with the Spirulina platensis derived bio-oil.
研究领域:
生物化学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Ye Chen,Xiayi Lu,Licong Liang,Zhiqiang Wu,Jianhua Chen
The development of non-activated collectors for sphalerite is aimed at eliminating the dependence of traditional flotation processes on copper sulfate, reducing mineral processing costs, and minimizing environmental pollution. Based on the surface electronic structure of sphalerite, this study establishes a molecular-level collector design strategy driven by enhanced outer-orbital coordination. Coordination chemistry analysis of Zn 2+ on the sphalerite surface demonstrates that Zn 2+ cannot form effective π-backbonding due to 3d 10 electron inertness, and enhancing σ-bonding between its outer sp orbital electrons and collectors is a viable approach to strengthen sphalerite-collector interactions. Accordingly, three novel collectors, namely 2-fluorothiophenol(2-FTP), 2-chlorothiophenol(2-CTP), and 2-bromothiophenol(2-BTP), were designed and synthesized by precisely introducing fluorine, chlorine, and bromine atoms at the ortho -position of the thiol group in thiophenol. Pure mineral flotation tests verified that the three novel collectors can efficiently recover non-activated sphalerite at low dosages. Among them, 2-BTP exhibited superior performance, with a recovery of 84.6% achieved at a dosage of 5 × 10 −6 mol/L. In actual ore flotation tests, both the grade and recovery of zinc concentrate obtained with the novel collectors under non-activated conditions were superior to those of the CuSO 4 + xanthate process. Combined with Fourier Transform Infrared Spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) analyses, and Density functional theory (DFT) calculations, it is revealed that stable σ bonds are formed between the novel collectors and Zn 2+ via the thiol S atom. Notably, 2-BTP can further form a binuclear coordination structure with Zn 2+ through the bromine atom, which significantly enhances adsorption stability. The introduction of halogen substituents effectively improves the electron enrichment degree and electron transfer capacity of the thiol group, thereby optimizing the outer-orbital coordination effect.
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DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2015
·
IF 4.513
Youhong Ai,Faqiong Zhao,Baizhao Zeng
A novel proton-type ionic liquid doped polyaniline (HIL-doped PANI) coating was presented, which was prepared on a stainless steel wire by electrodeposition in an aqueous solution containing aniline and 1-sulfobutyl-3-methylimidazolium hydrosulfate. The HIL-doped PANI coating showed granular nanostructure and had large specific surface. When it was applied to the headspace solid-phase microextraction of several amines (i.e., aniline, N -methylaniline, 3-methylaniline, 2-chloroaniline and 3-chloroaniline), it showed high extraction efficiency. The enrichment factors were 191.8–343.9 for different amines, much higher than those of common PANI and commercial polydimethylsiloxane/divinylbenzene coatings. Coupled with gas chromatographic analysis, the linear ranges were 0.097–100 μg/L with correlation coefficients above 0.9942, and the detection limits were 0.012–0.048 μg/L (S/N = 3) for different amines. The relative standard deviations (RSD) were smaller than 8.1% for five successive measurements with single fiber and the fiber-to-fiber RSDs were 8.6–13.8% ( n = 5) for these amines. The proposed method was successfully applied to the extraction and determination of amines in organic waste water samples, and the recoveries were 78.3–112.8% for different analytes.
研究领域:
分析化学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
BIORESOURCE TECHNOLOGY
·
2018
·
IF 5.807
Linlin Chen,Junjie Shao,Hui Chen,Caiqin Wang,Xinyi Gao,Xiangyang Xu,Liang Zhu
For enhanced dechlorination of 2,4-dichloronitrobenzene (2,4-DClNB), a coupled microbial electrosynthesis-upflow anaerobic sludge reactor (MES-UASB) was established, and the effect of cathode potential on the performance of combined process was investigated in this study. Results showed that a higher dechlorination efficiency of 78.5 ± 6.1% was achieved in the coupled MES-UASB at −660 mV, and the degradation rate of 4-chloroaniline (4-ClAn) reached 4.61 mg·L −1 ·d −1 within 120 h at −660 mV of cathode potential in batch experiments. The results of Illumina sequencing indicated that the biocathode operated at a lower potential favored the enrichment of dechlorination-related microbes such as Dehalobacter , Dehalococcoides and Anaeromyxobacter both in granular sludge and cathode biofilm. It could be speculated that a lower cathode potential is more feasible for the dechlorination of 2,4-DClNB due to the enrichment of dechlorination-related microbes as well as the production of electrons with higher energy for long-distance electron transfer (LDET).
研究领域:
环境科学
·
微生物学
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）