JOURNAL OF MOLECULAR LIQUIDS
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2020
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IF 5.065
Lili Ren,Dongyang Zhou,Jingjing Wang,Tao Zhang,Yinxian Peng,Guoguang Chen
The selection and preparation of materials is very important for the green treatment of wastewater. In our study, MnO 2 nanosheets were in-situ grown on biomass carbon microspheres (BCM) to format flower-like MnO 2 @carbon microspheres (CMn) adsorption composites. Amoxicillin (AMX) was adopted as model pollutant, and its adsorption was investigated as function of the contact time, AMX concentration, adsorbent dosage, and pH. The highest adsorption capacity of CMn was 16.094 mg/g in neutral medium. The adsorption isotherms were fitted using the Langmuir model. The kinetics of AMX adsorption was determined to follow the pseudo-first-order model. Recycle experiments indicated that CMn exhibited high adsorption efficiency (>80%) after four cycles. Therefore, the as-prepared CMn can be a promising material for removing pollutants form wastewater in the future.
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
JOURNAL OF HAZARDOUS MATERIALS
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2019
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IF 7.65
Wei Li,Yuxin Li,Deyun Zhang,Yeqing Lan,Jing Guo
CuO-Co 3 O 4 @CeO 2 nanoparticles used as a heterogeneous catalyst were prepared via a sol-gel method and characterized by various techniques. For comparison, a series of oxides was investigated for activating peroxymonosulfate (PMS) during the degradation of 2,4-dichlorophenoxyacetic acid (2,4-D). The results indicated that CuO-Co 3 O 4 @CeO 2 exhibited the highest catalytic performance among the catalysts. Complete degradation of 2,4-D (20 mg/L) was realized within 45 min at 1 mM PMS, CuO-Co 3 O 4 @CeO 2 loading of 0.07 g/L, and pH of 6. Recycling experiments confirmed that CuO-Co 3 O 4 @CeO 2 was very stable, and the 2,4-D degradation efficiencies ranged from 100% to 97.5%, decreasing by only 2.5% after the fifth run. The outstanding catalysis of CuO-Co 3 O 4 @CeO 2 resulted from the synergy of cerium, cobalt, and copper. Electron paramagnetic resonance and radical scavenger experiments confirmed the production of SO 4 • − and • OH radicals in the CuO-Co 3 O 4 @CeO 2 /PMS system, which were responsible for efficient decomposition of 2,4-D. Furthermore, the combination of CuO-Co 3 O 4 @CeO 2 andPMS was applied to treat natural water containing 2,4-D, and a high 2,4-D removal rate was also achieved. Based on these results, it was deduced that CuO-Co 3 O 4 @CeO 2 can be utilized as a catalyst to activate PMS and destroy organic contaminants in aqueous solution.
研究领域:
环境科学
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催化
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水处理
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DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Shizong Wang,Jianlong Wang
In this study, cobalt embedded into oxygen and nitrogen co-doped CNTs (Co@N-O-CNTs) was prepared by pyrolysis and used to activate peroxymonosulfate (PMS) for degradation of sulfamethoxazole. The experimental results showed that the content of oxygen precursor had important influence on the catalytic activity of Co@N-O-CNTs. When the content of oxygen precursor was 2 g, Co@N-O-CNTs exhibited better catalytic activity than previously reported Co@N-CNTs. Bulk and surface-bound radicals resulted in sulfamethoxazole (SMX) degradation, in which SMX degradation rate reached 0.247 min −1 with the mineralization of 35.6%. The possible pathway of SMX degradation was proposed based on the identified degradation products. Characterization results indicated that nitrogen, oxygen and cobalt in the structure of Co@N-O-CNTs-2 were active sites for PMS activation. Theoretical calculation suggested that nitrogen and oxygen co-doping created more active sites to activate PMS compared with single nitrogen doping. During the six cycling experiments, Co@N-O-CNTs-2 exhibited good catalytic and structural stability. The influencing factors, including temperature, pH, PMS concentration, chloridion, bicarbonate and humic acids were investigated. This study could provide a way to boost active sites of nitrogen doped carbonaceous materials to effectively activate PMS for degradation of emerging organic pollutants.
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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DOI
高影响因子
RSC Advances
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2015
·Vol. 6
·期 2
·987-994
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IF 3.84
Zhijun Li,Qi Yang,Yu Zhong,Xiaoming Li,Li Zhou,Xin Li,Guangming Zeng
In this study, Fe(II)-loaded granular activated carbon (GAC) was used as a heterogeneous persulfate catalyst for the pretreatment of mature landfill leachate. The effects of Fe2+ dosage, persulfate concentration and initial pH on the degradation of the organic pollutants in the landfill leachate were investigated. In single factor experiments, the maximum Chemical Oxygen Demand (COD) removal rate reached 66.8, 66.2 and 76.3% at an Fe2+ dosage of 127 mg L−1 (Fe2+/S2O82− = 254 mg mol−1), a persulfate concentration of 0.5 mol L−1 (i.e. S2O82− : 12COD0 = 1.08) and an initial pH of 3, respectively. Obviously, pH played a more important role in the persulfate oxidation treatment than the other two factors. The synthetic experimental results showed that the COD removal rate exceeded 87.8% when the reaction conditions had a controlled Fe2+ dosage of 127 mg L−1, persulfate concentration of 0.5 mol L−1 and initial pH of 3.0, simultaneously. The recycle experiments displayed that the catalytic ability of reused Fe(II)-GAC declined considerably and the COD removal rate dropped by approximately half after reusing three times. But the catalytic ability of the catalyst used could be well recovered after regeneration at 550 °C in a N2 atmosphere. Finally, fluorescence excitation–emission matrix (EEM) spectroscopy preliminarily explained the degradation mechanism of the landfill leachate.
研究领域:
环境工程
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废物管理
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水处理
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DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2022
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IF 6.633
Yangyang Wang,Xiaoxia Liu,Annie Yang,Ping Lv,Lixin Zhang,Yongnian Li,Yanzhao Yang
Selective recovery of gold and platinum from secondary resources is of great significance under the crisis of resource shortage. Hence, the optimal extractant 1-(2-(dimethylamino) ethyl)-4-methyl-piperazin bis(trifluoromethylsulfonyl)imide ([C 6 -Et-TMEDA-PIP][Tf 2 N] 2 ) was synthesized and screened out from five piperazine-based ionic liquids (ILs) to construct an IL-water system for Au(III) and Pt(IV) extraction. ILs have high hydrophobicity and low viscosity at room temperature, which can be used as both extractant and hydrophobic phase. The effects of IL dosage, metal concentration and acidity on the extraction efficiency were investigated. Under the optimal conditions, the extraction efficiency of 98.5% (Au(III)) and 97.5% (Pt(IV)) can be achieved. The anion exchange mechanism was verified through the combination of Ultraviolet visible spectroscopy (UV–vis), Nuclear magnetic spectra (NMR) and quantum chemical calculations. Besides that, the two-factor optimization of the extractant dosage and HCl concentration was carried out by Response surface methodology (RSM), and the effective separation of Au(III) and Pt(IV) was successfully achieved. Au(III)/ Pt(IV) was extracted into the IL phase as [Et-TMEDA-PIP + ][AuCl 4 - ] and can easily be stripped by reduction to Au(0)/Pt(Ⅱ) with H 2 C 2 O 4 /CS(NH 2 ) 2 -HCl, and each extraction ability maintained after 5 turns of extraction cycle experiments. Since the excellent behaviors showed in the multi-metal selective extraction and cycle experiments, the [C 6 -Et-TMEDA-PIP][Tf 2 N] 2 was regarded as the most potential system for Au(III) and Pt(IV) recovery from HCI medium.
研究领域:
化学
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材料科学
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环境科学
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分析化学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Yunan Chen,Longyong Wu,Wei Jiang,Yihan Liu,Peng Li,Mingxue Xiang,Jincheng Chen,Youqing Zou,Bing Xie,Ping Zhang
Graphene-like materials as a prevalent two-dimensional (2D) material have attracted tremendous attention in the water remediation field, yet the inherent nature of aggregation limits its macroscopic practical applications. To address the dilemma, a novel in-situ synthesis strategy, i.e . , integrated “self-template” and “structure designing”, was proposed in this study. Specifically, the organic layered double hydroxide (3D-LDH) was employed as self-template and carbon source to construct the functional three-dimensional (3D) graphene loading with layered double oxide (G@LDO). In virtue of the special 3D structure and components, G@LDO exhibited preeminent and ultrafast remediation ability toward acid orange (AO7, 1870.15 mg/g) and nickel (II) (Ni 2+ , 110.10 mg/g). Moreover, G@LDO maintained the exceptional removal of AO7 and Ni 2+ in a wide pH range and even in the authentic water matrices. The removal mechanisms were systematically investigated, unveiling that AO7 removal was strongly associated with metal-complexation, memory effect , and π-π electron donor–acceptor (EDA). While for Ni 2+ removal, besides ion-exchange interaction with Mg 2+ associated with LDO, the other S component induced the vacancy defect provided additional active sites for Ni 2+ capture. In addition, the recycle experiments demonstrated that G@LDO kept above 85% after five runs. Overall, this work not only opens a new avenue for the preparation of graphene-like material, but also provided a theoritical guidance for the authentic application on the removal of dyes and heavy metals.
研究领域:
环境科学
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材料科学
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水处理
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产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2023
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IF 3.8
Hui Yu,Xiaojia Wu,Chuanqi Geng,Xinyu Li,Chencan Du,Zhiyong Zhou,Zhongqi Ren
The separation of aromatics from aliphatics is essential for achieving maximum exploitation of oil resources in the petrochemical industry. In this study, a series of metal chloride–based ionic liquids were prepared and their performances in the separation of 1,2,3,4-tetrahydronaphthalene (tetralin)/dodecane and tetralin/decalin systems were studied. Among these ionic liquids, 1-ethyl-3-methylimidazolium tetrachloroferrate ([EMIM][FeCl 4 ]) with the highest selectivity was used as the extractant. Density functional theory calculations showed that [EMIM][FeCl 4 ] interacted more strongly with tetralin than with dodecane and decalin. Energy decomposition analysis of [EMIM][FeCl 4 ]–tetralin indicated that electrostatics and dispersion played essential roles, and induction cannot be neglected. The van der Waals forces was a main effect in [EMIM][FeCl 4 ]–tetralin by independent gradient model analysis. The tetralin distribution coefficient and selectivity were 0.8 and 110, respectively, with 10% (mol) tetralin in the initial tetralin/dodecane system, and 0.67 and 19.5, respectively, with 10% (mol) tetralin in the initial tetralin/decalin system. The selectivity increased with decreasing alkyl chain length of the extractant. The influence of the extraction temperature, extractant dosage, and initial concentrations of the system components on the separation performance were studied. Recycling experiments showed that the regenerated [EMIM][FeCl 4 ] could be used repeatedly.
研究领域:
化学工程
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石油化工
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材料科学
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计算化学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Pengyao Guo,Xiaomin Hu
To improve the degradation efficiency of g-C 3 N 4 (CN), transition metal elements (Fe and Co) were doped into CN. A novel Co, Fe co-doped CN (Co/Fe-CN) photocatalysts with small size and irregular flake structure were successfully prepared by thermal polymerization of melamine . Co/Fe-CN has a large specific surface area (55.76 m 2 /g), which provides more adsorption sites and reaction sites for the activation of peroxymonosulfate (PMS). Good visible light response performance (474 nm) and suitable band gap (2.83 eV) ensure that it could be excited by visible light. The active species of • O 2 - , 1 O 2 , • OH and SO 4 •- could be stably produced in Co/Fe-CN/Vis/PMS system with appropriate redox potential . Meanwhile, Co and Fe elements doped in CN also could effectively activate PMS and promote the generation of active species. Besides, the continuous generation of photogenerated electrons promoted the cycling of Co 3+ /Co 2+ and Fe 3+ /Fe 2+ , and further enhanced the degradation efficiency of Co/Fe-CN/Vis/PMS towards Levofloxacin (LVFX). LVFX could be rapidly removed, reaching 92.1% within 50 min under visible light illumination, and the kinetic rate constant of LVFX was 0.0638 min -1 . The quenching experiments verified that the 1 O 2 was the main active species in the reaction process. The cycling experiments revealed that the Co/Fe-CN/Vis/PMS system had favorable stability and applicability. This work provides a simple preparation method to fabricate bimetallic co-doped CN for the enhancement of degradation rate in the Photocatalyst/Vis/PMS system.
研究领域:
环境科学
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材料科学
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光催化
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水处理
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）