CARBOHYDRATE POLYMERS
·
2019
·
IF 6.044
Hao Zhang,Liang Peng,Anwei Chen,Cui Shang,Ming Lei,Kai He,Si Luo,Jihai Shao,Qingru Zeng
Chitosan-stabilized FeS magnetic (MC-FeS) composites were successfully prepared to address the easily oxidization of FeS and enhance Cr(VI) removal from water. Results showed that the MC-FeS composites enhanced the Cr(VI) removal capacity as compared to bare FeS. Further investigation using X-ray photoelectron spectroscopy showed that FeOOH, S 8 , Cr 2 O 3 , Cr 2 S 3 , and a Fe(III)-Cr(III) complex were apparently introduced by Cr(VI), Fe(II), and S(−II), respectively. The sorption kinetics could be interpreted using a pseudo-second-order kinetic model, whereas the isotherms were simulated using the Redlich‒Peterson isotherm model indicating Cr(VI) removal by MC-FeS composites was a hybrid chemical reaction‒sorption process. In addition, the MC-FeS composite presented high stability against aging and performed well in a long-term reaction system and typical natural water environment. The effective performance of MC-FeS composites shows their great potential in wastewater remediation contaminated by heavy metals.
研究领域:
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
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Meijing Cao,Jing Tian,Yang Zhou,WenLong Liu,Jin Dang,Weibing Li,Jiarun Li,Lei Wang
The low electrical conductivity and catalytic activity of transition metal sulfides have been identified as the primary factors limiting their application in the field of electrocatalytic water splitting. In this study, FeS 2 and Co-FeS x were initially synthesized through a hydrothermal method, followed by further annealing in an NH 3 atmosphere to obtain Co,N-FeS x . The introduction of Co led to adjustments in the electronic structure, resulting in the formation of FeS 2 /FeS (FeS x ) heterojunctions that facilitated accelerated charge transfer. Simultaneously, Co element doping increased the electrochemical active surface area, providing more active sites for the reactions. N element doping, on the other hand, introduced sulfur vacancies, thereby enhancing electrical conductivity and improving charge transfer efficiency. As a result, Co,N-FeS x exhibited significantly higher activities for the oxygen evolution reaction (OER) and overall water splitting compared to FeS 2 , with overpotentials of 290 mV and 330 mV, respectively, at a current density of 10 mA cm −2 . Furthermore, the catalyst demonstrated excellent stability. The designed structure of the catalyst provides theoretical support for the study of Fe-based catalysts in OER and overall water splitting.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Ruijie Teng,Hong Wei,Jinfen Niu,Xia Ma
The activation of peroxymonosulfate (PMS) with FeS is a promising wastewater treatment technology. The degradation mechanism of iopamidol (IPM) in the PMS/FeS system and the effect of Cl − were examined. The results indicated that the surface-bound radicals (SO 4 •− ads and HO • ads ) generated on the FeS surface were identified as the primary reactive species contributing to IPM degradation. The surface and dissolved Fe(II), together with the Fe(II)/Fe(III) cycling facilitated by the surface sulfur on FeS, were all conducive to the activation PMS. When Cl − were in the range of 1 ∼ 5 mmol/L, the IPM degradation rate remained at almost 80 %. The generation of chlorinated products reduces ecotoxicity. The presence of Cl − mitigated the formation of iodoform, notwithstanding the impact on TOC removal. This study can provide a certain basis for the mechanism of FeS/PMS in degrading contaminants and its application for contaminant removal from chlorinated waters.
研究领域:
环境科学
·
水处理技术
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2021
·
IF 4.837
Xianlin Zeng,Lu Wang,Yongqing Zhang,Shaoqi Zhou,Zebin Yu,Xun Liu,Chuan Chen
This work delivered a simple modification method for promoting persulfate (PS) activation by zero-valent iron (ZVI). The results showed that the ball-milled FeS/Fe 0 had the highest imidacloprid (IMI) removal efficiency among the tested materials (FeS, Fe 0 , mixed FeS/Fe 0 , and ball-milled FeS/Fe 0 ) under the same conditions (activator dosage = 0.1 g/L; PS = 2.5 mM; IMI = 0.15 mM). Ball milling ZVI and FeS together makes the mixture smaller in particle size, higher in crystallinity and produces iron-sulfur compounds that covered the surface. These changes contributed to the rapid corrosion of ZVI and thereby promoted the persulfate activation. Increasing the ball milling rotational speed made these enhancements more obvious. In addition, the Fe 3+ reduction by FeS created an acidic condition and further promoted the Fe 0 release. The optimal parameters for ball milling FeS and Fe 0 were a FeS/Fe 0 (1:1–4:1, w:w) and a 600 rpm of rotational speed for 30 min. The impacts of different ball-milled material dosages, persulfate dosages, anion concentrations and initial pH were investigated. In the optimum ball-milled FeS/Fe 0 /PS system (ball-milled FeS/Fe 0 = 0.1 g/L; PS = 2.5 mM), the pollutant (IMI = 0.15 mM) removal efficiency reached 95% at 10 min. The common dissolved anions (3 mM SO 4 2− /NO 3 − /Cl − ) and alkaline conditions only had a slight inhibitory effect. The IMI removal efficiency still reached 95% at 15 min. These observations suggest that the Fe 0 -based persulfate activation technique was enhanced by ball milling with FeS, making it more feasible for remediation of organic pollutant removal.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
International Journal of Environmental Research and Public Health
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2022
·Vol. 19
·期 18
·11447
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IF 4.614
Hong Xiao,Yingjun Wang,Hong Peng,Ying Zhu,Dexin Fang,Ganxue Wu,Li Li,Zhenxing Zeng
The transformation of organic pollutants by stabilized nano-FeS in oxic conditions is far less understood than in anoxic states. Herein, carboxymethyl cellulose-stabilized FeS (CMC-FeS) nanofluids are prepared at a CMC-to-FeS mass ratio of 1/2 and their performance of tetracycline hydrochloride (TC) degradation under oxic conditions was investigated. Here, we showed that TC could be efficiently removed by oxygenation of CMC-FeS nanofluids at neutral initial pH. We found that CMC-FeS dosages as low as 15 mg/L can achieve the TC removal efficiency as high as 99.1% at an initial TC concentration of 50 mg/L. Oxidative degradation plays a predominated role in TC removal (accounting for 58.0%), adsorption has the second importance (accounting for 37.0%), and reduction has minor impact (accounting for 4.1%) toward TC removal. Electron spin resonance assays, fluorescent detection using coumarin as a probe, and radical scavenging experiments confirm that hydroxy radicals (•OH), both in free and surface-bound forms, contribute to oxidation of TC. Humic acids brought detrimental effects on TC removal and therefore should be biologically degraded in advance. This work offers a facile and cost-effective solution to decontaminate TC in natural and engineered water bodies.Keywords:tetracycline hydrochloride;CMC-FeS nanofluid;oxygenation;hydroxy radicals
研究领域:
环境科学
·
污染治理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Dong Cheng,Haoran Ding,Yuansen Tan,Dezhi Yang,Ying Pan,Wenjuan Liao,Feng He
Oxidizing potential of FeS for organic contaminants degradation due to hydroxyl radicals (•OH) production has been recently documented, but the oxidizing efficiency was limited. Here, we revealed that low-molecular-weight organic acids (LMWOAs) can immensely enhance phenol degradation during FeS oxygenation due to increased utilization efficiency of FeS electron for •OH production. Upon oxygenation of 0.5 g/L FeS, phenol degradation boosted from 7.1% without LMWOAs to 91.5%, 84.6% and 95.0% with the addition of 1 mM oxalate, citrate and EDTA, respectively. Electron utilization efficiency of Fe(II) for •OH production dramatically rose from 0.3% with FeS alone to respective 2.0%, 2.5% and 2.7% in the LMWOAs systems. An increase in oxalate concentrations benefited •OH formation and phenol degradation. Coexisting oxalate led to an additional •OH production pathway from Fe(II)-oxalate oxidation , which expanded the O 2 reduction to H 2 O 2 from a two- to one-electron transfer process. Meanwhile, electron transfer from FeS to dissolved Fe(III)-oxalate promoted the redox cycling of Fe(III)/Fe(II), thus supplying the Fe(II) oxidation for •OH production. Moreover, the presence of oxalate decreased the crystallinity and particles size of lepidocrocite generated from FeS oxidation. Consequently, this study shed lights on the LMWOAs-enhanced contaminant degradation in either natural or engineered FeS oxidation systems.
研究领域:
环境科学
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化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS ES&T Engineering
·
2025
·
IF 6.7
Lei Lu,Xu Cao,Xian-Wei Liu,Han-Qing Yu
Fenton-based advanced oxidation processes (AOPs) are widely applied for the degradation of recalcitrant organic pollutants in chemical industrial wastewaters. However, traditional systems often generate excessive iron sludge and face challenges in sustaining Fe2+ production, which reduces hydroxyl radical (·OH) utilization efficiency and increases treatment costs. Here, we present a FeS-modified micron-sized zerovalent iron (FeS-mZVI) catalyst that enhances continuous Fe2+ release and prevents FeOOH passivation. The FeS-mZVI/H2O2 system achieved nearly 90% COD removal of phenol within 2 h and maintained high efficiency in pilot-scale testing, achieving over 50% COD reduction in real industrial wastewater with a 47% reduction in operational costs compared to traditional Fenton processes. Mechanistic studies confirmed that ·OH, generated through a Fe2+-dominated homogeneous Fenton reaction, are the primary reactive species. These findings indicate that the FeS-mZVI/H2O2 system is a promising and practical approach for large-scale chemical industrial wastewater treatment, offering both economic and environmental advantages.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED GEOCHEMISTRY
·
2024
·
IF 3.1
Yanting Pan,Feng Zhang,Ziyang Zhou,Feng Jiang,Xiaoming Wang,Hui Yin,Wenfeng Tan,Xionghan Feng
A series of cobalt-doped FeS (x% Co–FeS) nanoparticles , prepared via a hydrothermal method, were introduced as catalysts for generating radicals from peroxymonosulfate (PMS) to degrade the endocrine disrupter bisphenol S (BPS) in wastewater. The kinetic results revealed that only a small amount of Co doping (7% At.) could greatly improve the efficiency of PMS activation by FeS, leading to the rapid degradation of BPS (0.21min −1 vs. 0.0046 min −1 ), and no secondary pollution caused by Co leaching. Notably, exceptional activation was observed over a wide pH range from 4 to 11. Moreover, various background ions (NO 3 − , Cl − , CO 3 2− ) and temperatures (10.0–55.0 °C) minimally affected BPS degradation, suggesting excellent applicability in different sewage environments. Furthermore, quenching experiments, coupled with electron paramagnetic resonance technology, identified singlet oxygen ( 1 O 2 ) and sulfate radicals (SO 4 •- ) as the primary reactive oxygen species responsible for BPS degradation. Due to the selectivity of 1 O 2 and the high redox potential of SO 4 •- , this technology had excellent anti-interference and degradation ability. In six repeated batch experiments, the catalysts showed favorable cyclability and stability due to Co(II)/Co(III) cycling mediated by structural S 2− . These results provided insights into the potential applications of modifying natural FeS-type minerals as a promising heterogeneous catalyst for environmental restoration.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Rongrong Ding,Guannan Zhou,Chuanshu He,Wenqiang Li,Yiran Wang,Xiaocheng Liu,Bo Lai,Yang Mu
The process of FeS oxygenation is intrinsically associated with the fate of contaminants in heterogeneous aquifers, whereas the impacts of common heavy metals are poorly understood. In this study, we found that the introduction of Co 2+ and Ni 2+ (Me 2+ ) resulted in a remarkable 3–10-fold enhancement in the degradation of bisphenol A , which stemmed from the significant increase in the generation of •OH and SO 4 •− . The improved production of reactive species was primarily attributed to the accelerated regeneration of Fe(II); the introduction of Me 2+ manipulated the electronic structure of FeS and consequently facilitated electron transfer from S 2- to Fe(III), as revealed by experimental evidence and density functional theory calculations. This study represents the first endeavor to underscore the influence of coexisting heavy metals on contaminant degradation during FeS oxygenation.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Fenglei Liu,Shanshan Wang,Baowei Hu
Herein, a MXenes decorated nanoscale FeS composites were developed via electrostatic self-assembly strategy to achieve efficient U(VI)/Cr(VI) adsorption-reduction. Different analytical techniques were applied to adequately characterize all as-prepared materials to determine the formation of species with the desired morphology and properties. Results revealed that the special chemical structure of MXenes could improve the dispersion of FeS nano-particles and suppress its aggregation. Meanwhile, the adsorption data closely well tailored with the Langmuir isotherm and Pseudo-second-order equation, and the maximum removal efficiencies were 88.5 and 107.2 mg/g for uranium(VI) and chromium(VI). It was also found that the presence of other cations and anions had no obvious influence on removal of U(VI)/Cr(VI), whereas the elimination process was a spontaneous endothermic reaction . More importantly, according to the spectroscopic analysis and DFT calculation , both FeS and surface functional groups on Ti 3 C 2 @FeS-PDA/PEI exhibited strong chemical affinities to the targeted pollutants, while FeS could effectively reduce Uranium(VI) to Uranium(IV) and Chromium(VI) to Chromium(III). This work facilitated the omnidirectional improvement of MXenes-based materials for the de-pollution of practical radionuclide or heavy metals wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Yong Sun,Mengbin Gu,Shuguang Lyu,Mark L. Brusseau,Ming Li,Yanchen Lyu,Yunfei Xue,Zhaofu Qiu,Qian Sui
The performance of trichloroethene (TCE) removal was initially investigated in sodium persulfate (SPS) or potassium monopersulfate triple salt (PMS) oxidative environment by reduced graphene oxide (rGO) supported nZVI (nZVI-rGO) catalyst and further the role of sulphur by anchoring nano FeS on nZVI-rGO (FeS@nZVI-rGO) was evaluated. The high usage of oxidants and stability of FeS@nZVI-rGO catalyst were significantly improved due to the insoluble nature of this innovative catalyst by involvement of nano FeS which limited the rapid iron loss caused by the corrosion of active sites and mitigated rapid oxidants decomposition in FeS@nZVI-rGO/SPS and FeS@nZVI-rGO/PMS systems. The tests for target contaminant removal showed that over 95 % TCE could be removed at 100 mg L −1 FeS@nZVI-rGO and 1.2 mM SPS or 0.3 mM PMS dosages, in which over 85 % TCE could be dechlorinated. The reactive oxygen radicals (ROSs) generation mechanisms and their contribution to TCE removal were investigated through radical scavenge tests in both systems, indicating that both HO and SO 4 − were the major ROSs rather than O 2 − . In conclusion, this study revealed the well function and fundamental mechanism of this innovative catalyst by anchoring nano FeS and worth of further demonstration of this technique in TCE contaminated groundwater remediation application.
研究领域:
环境科学
·
污染修复
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Siyu He,Wanrong Hu,Yali Liu,Yi Xie,Hui Zhou,Xuqian Wang,Jing Chen,Yongkui Zhang
Uranium in groundwater during uranium mining activities urgently needs to be remediated through effective and environmental-friendly approaches. The reduction and immobilization of soluble U(VI) using biogenic carboxymethyl cellulose modified iron sulfide complex (biogenic CMC-FeS complex) is one of the emerging and innovative methods. However, its removal mechanism is largely unknown. Here, biogenic CMC-FeS complex with extracellular polymeric substances (EPS) and CMC was successfully synthesized by sulfate-reducing bacteria (SRB) and showed highly dispersible capacity. The tryptophan and tyrosine, which were the main components in EPS produced by SRB on CMC-FeS surface, significantly increased the U(VI) removal capacity of the biogenic CMC-FeS complex compared with chemically synthesized CMC-FeS. U(VI) removal was attributed to the adsorption of soluble U(VI) by ≡ FeO + , CMC, tryptophan, and tyrosine on the biogenic CMC-FeS complex, following its reduction by S 2- , S 2 2- and Fe 2+ . Moreover, biogenic CMC-FeS complex with CMC-to-FeS molar ratio of 0.0005 performed well in the presence of bicarbonate (5 mM), humic acid (10 mg/L), or co-existing cations such as Pb 2+ , Ni 2+ , Cd 2+ , Mn 2+, and Cu 2+ (200 ug/L) at pH 7.0, and displayed relatively high oxidation resistance and stability ability. This work provides an in-depth understanding of the biogenic CMC-FeS complex for the U(VI) removal and contributes to the development of cost-effective U(VI) remediation technologies .
研究领域:
环境科学
·
微生物学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）