ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 27
·期 14
·16484-16495
·
IF 3.056
He Xingyu,Min Xiaobo,Peng Tianyu,Ke Yong,Zhao Feiping,Sillanpää Mika,Wang Yunyan
Ball-milling is considered as an economical and simple technology to produce novel engineered materials. The ball-milled microscale zero valent iron/pyrite composite (BM-ZVI/FeS 2 ) had been synthesized through ball-milling technology and applied for highly efficient sequestration of antimonate (Sb(V)) in aqueous solution. BM-ZVI/FeS 2 exhibited good Sb(V) removal efficiency (≥ 99.18%) at initial concentration less than 100 mg Sb(V)/L. Compared to ball-milled zero valent iron (ZVI) and pyrite (FeS 2 ), BM-ZVI/FeS 2 exhibited extremely higher removal efficiency due to the good synergistic adsorption effect. BM-ZVI/FeS 2 showed efficient removal performance at broad pH (2.6–10.6). Moreover, the coexisting anions had negligible inhibition influence on the Sb(V) removal. The antimony mine wastewater can be efficiently remediated by BM-ZVI/FeS 2 , and the residual Sb(V) concentrations (< 0.96 μg/L) can meet the mandatory discharge limit in drinking water (5 μg Sb/L). Experimental and model results demonstrated that endothermic reaction and chemisorption were involved in Sb(V) removal by BM-ZVI/FeS 2 . The XRD and XPS analyses confirmed that the complete corrosion of ZVI occurred on BM-ZVI/FeS 2 after Sb(V) adsorption, resulting in the enhanced Sb(V) sequestration. Mechanism analyses showed that the excellent removal performance of BM-ZVI/FeS 2 was ascribed to the high coverage of iron (hydr)oxide oxidized from ZVI. Because of the advantages of economical cost, high Sb(V) removal capacity and easy availability, BM-ZVI/FeS 2 offers a promising adsorbent for Sb(V) remediation.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
Collagen and Leather
·
2025
·Vol. 7
·期 1
·1-13
·
IF 9.2
Cai Zhenpeng,Xiang Yujia,Cong Boyi,Liu Yang,Yang Shuai,Wang Ningruo,Zhang Heng,Wang Yuzhong,Lai Bo
Tetrakis(hydroxymethyl)phosphonium sulfate (THPS) is commonly used as a preservative and fungicide in leather production that leads to its presence in tannery wastewater. As a typical organic phosphorus pollutant, THPS poses potential threats to both the ecological environment and human health. Herein, this investigation used the microscale zero-valent iron (mZVI)/O3 process to eliminate THPS from aquatic environments. The mZVI/O3 system demonstrated superior removal performance, achieving high removal efficiencies of total phosphorus (TP), organic phosphorus (OP), and chemical oxygen demand (COD) compared to traditional systems (i.e., mZVI alone, O3 alone, Fe2+/O3, and Fe3+/O3). Moreover, batch experiments were conducted to optimize the key operational parameters (such as initial pH, mZVI dosage, O3 concentration, and stirring rate). The TP, OP, and COD removal efficiencies in the mZVI/O3 system reached 97.10%, 97.31%, and 81.56% within 20 min, respectively, under optimized conditions. Based on the experimental results and characterization analysis, the THPS degradation mechanism by the mZVI/O3 system was primarily a combination of oxidation (60.37% ± 7.41%) and flocculation (39.63% ± 7.41%). Furthermore, the mZVI/O3 system demonstrated unprecedented removal performance in various actual wastewater samples. The system eliminated organic pollutants and improved biodegradability of actual wastewater. This study not only establishes the mZVI/O3 process as a robust, cost-effective, and environmentally sound approach for OP degradation but also offers substantial promise for practical wastewater treatment applications.
研究领域:
环境科学
·
化学工程
·
水污染控制
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2017
·Vol. 24
·期 30
·23538-23548
·
IF 2.741
Tang Fenglin,Xin Jia,Zheng Xilai,Zheng Tianyuan,Yuan Xianzheng,Kolditz Olaf
A microscale zero-valent iron (mZVI)-based in situ reactive zone is a promising technology for contaminated groundwater remediation. Estimation of mZVI aging behavior after its injection into the subsurface is essential for efficiency and longevity assessments. In this study, batch tests were conducted to investigate the effect of initial pH on mZVI aging dynamics, as well as the formation and evolution of aging products over 112 days. Results indicated that mZVI aging accelerated with decreasing initial pH. Corrosion rates of mZVI particles under pH 6.0 and 7.5 were approximately two orders of magnitude higher than those observed at pH 9.0. The morphological, structural, and compositional evolution of mZVI particles in three systems (pH = 6.0, 7.5, and 9.0) were investigated using scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. In acidic and neutral solutions, a thick passivation layer with loosely and unevenly distributed aging precipitates was observed, and Fe 3 O 4 was the final aging precipitate. Nevertheless, in alkaline solutions, minute aging precipitates were detected on the mZVI surface at 112 day. Characterization results suggested that mZVI was oxidized via the Fe 0 –Fe(OH) 2 –Fe 3 O 4 route. These findings shed new light on mZVI aging mechanisms, particularly its physicochemical characteristics and the structural evolution of mZVI in field-scale groundwater remediation applications.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Minda Yu,Xuhui Mao,Xiaosong He,Mingxia Zheng,Xu Zhang,Jing Su,Beidou Xi
Microscale zero-valent iron (mZVI) is used as a catalyst for peroxide activation and, has attracted considerable attention for the degradation of organic contaminants. However, surface inherent oxide films impedes electron transfer in mZVI and decrease its activation efficiency. Herein, the mZVI surface was modified by sodium disilicate (Si-mZVI bm ) using a mechanical ball-milling approach. The mechanochemically silicified mZVI enhanced the sulfamethazine removal rate by 2.9–23.8 fold in relation to unmodified ZVI; this rate increased with the Si/Fe molar ratio (0–8%). Reactive intermediates, including radicals and non-radicals, were efficiently generated via peroxydisulfate (PDS) activation over Si-mZVI bm both SO 4 •- and Fe(IV) contributed toward sulfamethazine removal. The excellent performance of PDS activation over Si-mZVI bm particles was attributed to the continuous generation of ferrous ions, which was due to the accelerated iron release and more effective Fe 3+ /Fe 2+ cycles in the Si-mZVI bm /PDS system after silicification.
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
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yue Lu,Jiahui Lei,Haoran Dong,Linrui Zhong,Qiqi Fu,Qingqing Xie,Long Li,Fangyi Liang
Chlorophenols (CPs) pose potential threat to the environment and public health due to their persistence and high toxicity. Zero-valent iron coupled with microorganisms have been applied for the degradation of halogenated organic matter, which is considered as a remediation technology of increasing interest. However, few studies have attempted to investigate the effects of this coupled system on CPs degradation and to comprehensively unveil the governing mechanisms. In this study, we systematically compared the effects of the composite system of microscale zero-valent iron (mZVI) with different particle sizes and Desulfitobacterium hafniense DCB-2 (i.e. 3 μm mZVI + DCB-2, 5 μm mZVI + DCB-2, and 10 μm mZVI + DCB-2) on the process of bioreductive dechlorination of 2,3-dichlorophenol (2,3-DCP). Interestingly, the lower particle sizes of mZVI (3 μm and 5 μm) were more favorable for rapid 2,3-DCP bio-dechlorination due to the fact that mZVI with smaller particle size were less likely to agglomerate with strain DCB-2, which facilitated the transfer of electrons from strain DCB-2 to 2,3-DCP. Besides, the optimal particle size of mZVI (3 μm) was selected from the above experimental results to further explore the percentage generation of reduction products and the dechlorination pathway of 2,3-DCP in composite system. The results showed that the low toxicity product 2-chlorophenol (2-CP) accounted for 31.76 % of the composite system, while in the pure bacteria treatment this value was only 20.42 %. The mZVI and DCB-2 coupling strategy might provide a new idea and feasible solution for the green reduction of chlorinated phenols.
研究领域:
环境科学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
ACS ES&T Engineering
·
2024
·
IF 7.4
Kai He,Yuanfang Lai,Shuchen Wang,Li Gong,Feng He
Metal doping for improving the reactivity of zerovalent iron (ZVI) has been well studied, while Mn(II)-modified microscale ZVI (Mn-mZVI) has not yet been explored. Herein, ball-milled Mn-mZVI was fabricated and used for Cr(VI) removal. Characterization analysis showed that the structure, composition, and charge of mZVI changed after the Mn(II) modification. The comparative test showed that Mn-mZVI could remove 100% of Cr(VI) within 10 min, whereas mZVI removed negligible Cr(VI) within 60 min. The zeta-potential and electrochemical evidence verified that the enhanced electrostatic attraction and electron-transfer ability contributed to the superior Cr(VI) removal performance of Mn-mZVI. Moreover, the solution pH increase caused the decline of Cr(VI) removal, and the presence of NO3– inhibited Cr(VI) removal, whereas other coexisting ions showed little influence on the Cr(VI) removal performance of Mn-mZVI. Chemical and material characterization analyses revealed that Cr(VI) reduction by Mn-mZVI was the combined action of Fe(0) and generated Fe(II). In addition, the reusability of Mn-mZVI was not ideal due to the surface passivation and loss of Mn(II), but the reactivity could be reactivated by ball-milling the reacted Mn-mZVI again with Mn(II). Overall, this work provides a new mentality for mZVI modification and is important to develop promising mZVI-based materials for Cr(VI) pollution control.
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
ENVIRONMENTAL TECHNOLOGY
·
2023
·
IF 2.8
Yi Li,Naijin Wu,Jiuhao Song,Zhenxia Wang,Peizhong Li,Yun Song
The in-situ reduction of zero-valent iron (ZVI) is an effective method for removing chlorinated aliphatic hydrocarbons (CAHs) from groundwater. The heterogeneity of environmental conditions is also crucial in affecting dechlorination efficiency. Until now, the effect of Sulfate (SO42–) on ZVI activity has been debated, and the related mechanism research on SO42– behaviour during the abiotic reduction process of chlorinated alkanes is still lacking. In this study, the impacts of SO42– concentrations (0, 2, 4, 8, 80 mM) on the degradation of 1,1,2-trichloroethane (1,1,2-TCA) by micron-size ZVI (mZVI) and nano-size ZVI (nZVI) were systematically investigated. For mZVI, Kobs increased by 0.6 (2 mM), 0.5 (4 mM), 1.1 (8 mM), and 1.6 times (80 mM). For nZVI, Kobs decreased by 32% (2 mM), 39% (4 mM), 45% (8 mM), and 9% (80 mM). The results showed that SO42– increased the rate of 1,1,2-TCA degradation by mZVI but weakened the reduction performance of nZVI; however, this inhibition was reduced when the concentration reached 80 mM. SO42− controlled the degradation of 1,1,2-TCA mainly through the formation of different iron-sulfate complexes on the ZVI surface: water-soluble bidentate iron-sulfate complexes formed on the mZVI surface promoted the corrosion of the oxide layer and accelerated the reduction of 1,1,2-TCA, monodentate complexes mainly formed on the nZVI surface inhibited the reduction of 1,1,2-TCA by blocking surface sites. These results demonstrate the proof of concept to assist land managers in the field application of ZVI technology for the remediation of CAHs contaminated sites with different background concentrations of SO42−.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Litao Wang,Linna Jia,Jia Xin,Lijun Chen,Weiran Meng,Jiahui Lu
Coupling microscale zero-valent iron (mZVI) and anaerobic bacteria (AB) for removal of chlorinated aliphatic hydrocarbon (CAHs) in groundwater is challenging due to decreased efficiency and undesirable products caused by the coexisting nitrate (NO 3 – ). Therefore, in this study, mZVI is modified using three methods (sulfidation, carbon modification, and Fe 2+ dosing) and combined with AB to construct coupled systems to investigate the removal performance of trichloroethylene (TCE) in the presence of NO 3 – . Among all the treatments, sulfidated mZVI coupled with AB (S-mZVI bm /AB) yields the highest TCE removal efficiency, removal rate, electron efficiency, and complete dechlorination ratio, as well as improved N 2 selectivity. Sustainability evaluation, which considers both technical and environmental indicators, show that S-mZVI bm /AB is the best remediation strategy with the lowest combined utility function value. The reaction kinetics, material characterization as well as bacterial community analysis in S-mZVI bm /AB prove that the sulfidation of mZVI enhances chemical dechlorination, which consequently weakens the chemical reduction of NO 3 – by mZVI and facilitates biodenitrification. These findings highlight the potential of S-mZVI bm /AB as a sustainable solution for groundwater remediation at CAHs-contaminated sites where NO 3 – coexists and provide some suggestions for its practical application.
研究领域:
环境科学
·
化学工程
·
微生物学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）