JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2025
·
IF 8.4
Xiao-Ming Zou,Tiao Zhang,Yu-Hua Dong,Cui Hu,Li Yin,Yu-Ling Zheng,Mi Li,Xiao-Yu Xiao,Wei Hui
Sulfonamide antibiotics (SAs) are widely used in the biomedical field but pose an environmental risk as ecotoxic pollutants. Developing eco-friendly methods to degrade SAs into harmless compounds is crucial. In this work, biochar (BC) was prepared from rice straw via pyrolysis and used to support S-nZVI, thereby forming the S-nZVI/BC composites. The results show high SAs removal efficiency (up to 98.3%) at optimal Fe/C and Fe/S molar ratios of 3:1 and 50:1, respectively, with strong tolerance to coexisting ions. Furthermore, the effectiveness of S-nZVI/BC(Fe 3 /C 1 , Fe 50 /S 1 ) sample was validated using five real wastewaters, and the results showed consistent performance, stability and reusability. Mechanistic studies revealed that S-nZVI/BC synergized with persulfate to enhance the reactivity of sulfate-free radical (SO 4− ·) and Fe 2+ . The degradation pathways of SAs, involving electrophilic substitution and nucleophilic attack, were elucidated by density functional theory (DFT) calculations. These insights were instrumental in comprehending the degradation mechanism of SAs. Additionally, the degradation dynamics of ten SAs were further analyzed using quantitative structure-activity relationship (QSAR) models and principal component analysis (PCA). Hence, this work highlights the potential of S-nZVI/BC for industrial wastewater treatment, providing insights into the degradation mechanisms and pathways of SAs.
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
Frontiers of Environmental Science & Engineering
·
2018
·Vol. 12
·期 4
·1-11
·
IF 1.961
Wang Xiangyu,Lian Weitao,Sun Xin,Ma Jun,Ning Ping
Polydopamine/NZVI@biochar composite (PDA/NZVI@BC) with high removal efficiency of tetracycline (TC) in aqueous solutions was successfully synthesized. The resultant composite demonstrated high reactivity, excellent stability and reusability over the reaction course. Such excellent performance can be attributed to the presence of the huge surface area on biochar (BC), which could enhance NZVI dispersion and prolong its longevity. The carbonyl group contained on the surface of biochar could combine with the amino group on polydopamine(PDA). The hydroxyl groups in PDA is able to enhance the dispersion and loading of NZVI on BC. Being modified by PDA, the hydrophilicity of biochar was improved. Among BC, pristine NZVI and PDA/NZVI@BC, PDA/ NZVI@BC exhibited the highest activity for removal of TC. Compared with NZVI, the removal efficiency of TC could be increased by 55.9% by using PDA/NZVI@BC under the same conditions. The optimal modification time of PDA was 8h, and the ratio of NZVI to BC was 1:2. In addition, the possible degradation mechanism of TC was proposed, which was based on the analysis of degraded products by LC-MS. Different important factors impacting on TC removal (including mass ratio of NZVI to BC/PDA, initial concentration, pH value and the initial temperature of the solution) were investigated as well. Overall, this study provides a promising alternative material and environmental pollution management option for antibiotic wastewater treatment.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Longqian Xu,Kaili Yan,Yunfeng Mao,Deli Wu
Using copper and/or iron based nanomaterial to activate dioxygen to produce free radicals is an alternative and environmental friendly technique, but the low conversion efficiency of oxygen and the rate-limiting step of superoxide radical generation limit current application. In present work, Cu 0 nano-shell-decorated nZVI (CFNs) was synthesized and employed to enhance the activation of oxygen for the removal of arsenic at circumneutral pH. The adsorption and oxidation pathways of arsenic were investigated by determination of arsenic distribution and radical scavenger methods. The results showed that the removal of arsenic by CFNs involved the initial step of As III adsorption by ferrihydrite followed by the oxidation of As III by hydroxyl radical ( OH abs ) and superoxide radical ( O 2 − abs ) radicals. In the presence of oxygen, the removal capacity of CFNs was improved twice than that of conventional nZVI (i.e. 453 mg/g and 263 mg/g, respectively). We inferred that Cu I in-situ generated in heterogeneous catalysis was of increasing importance and the O 2 – abs produced from the activation of dioxygen was regarded as the key factor in the generation of H 2 O 2 at pH 7. The enhancement of Cu I generation mainly because of: (i) the facial loading of Cu 0 shell accelerated the generation of Cu I , (ii) reductive Fe 0 core contributed to the regeneration of Cu I , and (iii) the generation of ferrihydrite with high specific surface area favored the adsorption of oxygen. Hence, CFNs enhanced the electron transfer between Cu I /Fe II and O 2 , increased the utilization efficiency of oxidants and improved the effectiveness of the functional nanoparticles for environmental applications.
研究领域:
环境科学
·
纳米材料科学
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2017
·Vol. 7
·期 10
·303
·
IF 3.553
Haijiao Lu,Jingkang Wang,Hongxun Hao,Ting Wang
With a large specific surface area, high reactivity, and excellent adsorption properties, nano zerovalent iron (nZVI) can degrade a wide variety of contaminants in wastewater. However, aggregation, oxidation, and separation issues greatly impede its wide application. In this study, MoS2/Fe3O4/nZVI nanocomposites were successfully synthesized by a facile step-by-step approach to overcome these problems. MoS2nanosheets (MNs) acted as an efficient support for nZVI and enriched the organic pollutants nearby, leading to an enhanced removal efficiency. Fe3O4nanoparticles (NPs) could not only suppress the agglomeration and restacking of MNs, but also facilitate easy separation and recovery of the nanocomposites. The synergistic effect between MNs and Fe3O4NPs effectively enhanced the reactivity and efficiency of nZVI. In the system, Cr(VI) was reduced to Cr(III) by nZVI in the nanocomposites, and Fe2+produced in the process was combined with H2O2to further remove 4-Chlorophenol (4-CP) through a Fenton reaction. Furthermore, the nanocomposites could be easily separated from wastewater by a magnet and be reused for at least five consecutive runs, revealing good reusability. The results demonstrate that the novel nanocomposites are highly efficient and promising for the simultaneous removal of Cr(VI) and 4-CP in wastewater.Keywords:nZVI;modification;nanocomposites;Cr(VI);4-CP;Fenton reaction;pollution treatment;recyclability;wastewater
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Cleaner Production
·
2024
·
IF 9.7
Bo Cao,Jianhua Qu,Wenhui Bian,Qiqi Hu,Xinyan Fu,Guangshan Zhang,Yuezhi Zhang,Yue Tao,Zhao Jiang,Ying Zhang
Persulfate (PS) activation by nano zerovalent iron (nZVI) is promising for water purification, which is restricted due to its easy agglomeration and oxidation. Herein, porous hydrochar loaded nZVI (nZVI@PHC) was successfully synthesized by one-step process. nZVI@PHC not only had excellent adsorption capacity (178.6 mg/g) and abundant functional groups, but also possessed highly dispersed nZVI for PS activation to produce reactive oxygen species. Impressively, 0.2 g/L of nZVI@PHC (PHC/nZVI = 5:3) and 0.4 g/L of PS could achieve 99.7 % of phenol removal within 10 min. Moreover, nZVI@PHC/PS system showed superior applicability among wide range of initial pH (3.0–9.0) and temperatures (25–55 °C). Phenol removal mechanisms were elaborated by dissolved iron ions, scavenging experiments, and electronic paramagnetic spectrometer. As a result, both non-free radical pathway mediated by O 2 1 and free radical pathway ( S O 4 • − , H O • , and O 2 • − ) participated in phenol degradation. Additionally, nZVI@PHC/PS system had favorable reusability and high tolerance to co-existing substance and different water bodies. This study provides a promising strategy to tailor highly active nZVI for PS activation to organic contaminants degradation.
研究领域:
环境科学
·
催化材料
✓ 已验证
产品关联
DOI
高影响因子
WATER AIR AND SOIL POLLUTION
·
2026
·Vol. 237
·期 22
·1293
·
IF 3.5
Li Xi,Zhang Luyao,Liu Ling,Yan Yunxia,Wang Ziqing,Wang Bing
Soil co-contamination by organic pollutants and toxic metals has become an increasingly prominent environmental concern worldwide, largely driven by intensive industrial and anthropogenic activities. In this study, BC-nZVI coupled with three oxidants—persulfate (PS), BS, and hydrogen peroxide (HP)—was evaluated for the simultaneous remediation of BaP and Cr(VI) co-contaminated soil. Among the tested systems, BC-nZVI/BS exhibited the best overall performance, achieving 77.7% BaP removal and 97.6% Cr(VI) reduction, followed by BC-nZVI/HP and BC-nZVI/PS. Among the three systems, the BC-nZVI/BS system maintained comparatively stable remediation performance over the tested pH range. Coexisting Cr(VI) exerted a pronounced synergistic effect on BaP degradation in the BC-nZVI/BS system, likely via promoting oxidant activation. Six classes of intermediates with simpler structures than BaP were tentatively identified, indicating the progressive transformation of BaP during the remediation process. Post-treatment characterization revealed the presence of Cr 2 O 3 , FeCr 2 O 4 , and Cr(OH) 3 , suggesting that Cr(VI) was predominantly removed through reductive precipitation to Cr(OH) 3 . Overall, the BC-nZVI/BS system showed promising potential for the remediation of BaP-Cr(VI) co-contaminated soils.
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
·
2025
·
IF 1
Da Ma,Xusheng Li,Huian Zou,Yi Qian,Mengqi Li,Wenchuan Xu
Nano zero-valent iron (NZVI) was successfully stabilized by using hydroxypropyl methyl cellulose (HPMC). Systematic characterization observations (including XRD, TEM, FTIR, and VSM), as well as settling performance, illustrated that, compared to bare nano zero-valent iron particles (NZVI), the dispersity and antioxidizability of HPMC-stabilized nanoscale zero-valent iron particles (H-NZVI) were improved. Nitrate reduction efficiencies by using iron powder, NZVI, H-NZVI-5, H-NZVI-10, and H-NZVI-20 were examined, and the results showed that a moderate amount of HPMC in modification can help prevent the aggregation of NZVI and achieve high reduction efficiency. Excessive HPMC in preparation led to a decline in reduction efficiency. In addition, effects of initial pH, dissolved oxygen concentrations, and reaction temperatures on nitrate removal were studied. The results showed that the efficiency decreased with increases in initial pH and dissolved oxygen concentrations. However, the stabilized NZVI showed great superiority to bare NZVI, maintaining high activity even at basic pH or aerobic conditions. Pseudo first-order kinetics was applied to study nitrate reduction kinetics and confirmed to correlate well with experimental data. Through analysis of rate constants at different temperatures, the apparent activation energy for nitrate reduction by H-NZVI-10 was calculated to be approximately 15.18 kJ/mol. This study demonstrates that HPMC-stabilized NZVI can serve as a promising nanomaterial for enhancing nitrate reduction of nitrate.
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 RESEARCH
·
2025
·
IF 7.7
Changyu Li,Suo Wang,Haoning Zhou,Xianqiang Gao,Weijie Shi,Shiyun Ai,Jichun Wu,Yuanyuan Sun
Perfluorooctanoic acid (PFOA) poses a significant and persistent threat to groundwater due to its stability, high mobility, and carcinogenicity. Conventional permeable reactive barrier (PRB) fillers, like nano zero-valent iron (nZVI), face challenges including nanoparticle aggregation and passivation. To overcome these limitations, this study developed nitrogen-doped carbon-stabilized nZVI (nZVI@NC) using a scalable, solvent-free method combining mechanochemical ball-milling and pyrolysis. The synthesized core-shell nZVI@NC material effectively encapsulates nZVI within graphitic carbon, significantly improving its dispersion and reactivity (with an average crystallite size of 24.78 nm). A concentration of 100 mg/L of nZVI@NC adsorbed 83.5 % of PFOA within a 2-h timeframe, and the isotherms revealed an outstanding PFOA uptake capacity of 162 mg/g. Column experiments confirmed practical efficacy: using 50 mg nZVI@NC achieved complete PFOA removal (initial influent: 0.1 mg/L, Darcy velocity: 0.81 m/day) with no breakthrough for the first 1188 mL. Furthermore, a removal efficiency of 61.3 % was sustained in actual groundwater. Mechanistic studies (XPS, SEM-EDS, AIMD simulations) revealed a biphasic adsorption process: an initial rapid phase driven by physicochemical interactions, followed by a diffusion phase governed by pore embedding. This work establishes nZVI@NC as an efficient, scalable, and high-performance PRB filler for sustainable in situ remediation of PFOA-contaminated groundwater.
研究领域:
环境科学
·
环境工程
·
纳米材料
·
水污染治理
·
土壤与地下水修复
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Hongwei Pang,Zhuofan Diao,Xiangxue Wang,Yan Ma,Shujun Yu,Hongtao Zhu,Zhongshan Chen,Baowei Hu,Jianrong Chen,Xiangke Wang
Nanoscale zero-valent iron (NZVI) has been considered as a potential scavenger for U(VI) elimination from aqueous environment. To decrease the aggregation and to improve antioxidation, sulfidation technology and biochar were applied to modify NZVI. In this work, Dictyophora indusiate -derived biochar supported sulfide NZVI (DI-SNZVI) was synthesized and applied for U(VI) elimination. The excellent behaviors of kinetics (3 h for equilibrium), thermodynamic research and maximum removal amounts (427.9 mg·g −1 at pH = 5.0 and 298 K) revealed the outstanding performances of DI-SNZVI in U(VI) removal. The cycle experiments and different water system investigations further illustrated its potential ability for real applications. Moreover, the abundant functional groups and FeS x shell of DI-SNZVI were proved to be responsible for the enhanced removal of U(VI). In the end, the macroscopic and XPS study revealed that U(VI) elimination mechanisms were synergistic attributed to the adsorptive and reductive processes. This paper highlighted the biochar-based sulfide NZVI for efficient U(VI) elimination in environmental pollution management.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2013
·
IF 3.172
Xiaoshu Lv,Xiaoqin Xue,Guangming Jiang,Donglei Wu,Tiantian Sheng,Hongyi Zhou,Xinhua Xu
Nanoscale Zero-Valent Iron (nZVI) assembled on magnetic Fe 3 O 4 /graphene (nZVI@MG) nanocomposites was synthesized for Cr(VI) removal from aqueous solution. nZVI particles were perfectly dispersed either among Fe 3 O 4 nanoparticles (Fe 3 O 4 NPs) or above the basal plane of graphene. This material shows Cr(VI) removal efficiency of 83.8%, much higher than those of individuals (18.0% for nZVI, 21.6% for Fe 3 O 4 NPs and 23.7% for graphene) and even their sum of 63.3%. The removal process obeys pseudo-second-order adsorption model, suggesting that adsorption is rate-controlling step. Maximum Cr(VI) adsorption capacity varies from 66.2 to 101.0 mg g −1 with decreasing pH from 8.0 to 3.0 at 30 °C. Negative Δ G and Δ H indicate spontaneous tendency and exothermic nature. Robust performance of nZVI@MG arises from the formation of micro-nZVI-graphene/nZVI-Fe 3 O 4 batteries and strong adsorption capability of broad graphene sheet/Fe 3 O 4 surfaces. Electrons released by nZVI spread all over the surfaces of graphene and Fe 3 O 4 , and the adsorbed Cr(VI) ions on them capture these floating electrons and reduce to Cr(III). Fe 3 O 4 NPs also served as protection shell to prevent nZVI from agglomeration and passivation.
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
CHEMOSPHERE
·
2019
·
IF 5.108
Qing Wang,Xin Song,Shiyue Tang,Lei Yu
Chlorinated volatile organic compounds, such as tetrachloroethylene (PCE), are the most commonly detected toxic contaminants in groundwater. In this study, the performance of PCE removal by a microbial consortium combined with nZVI modified by layered double hydroxide (nZVI-LDH) was evaluated. The enriched PCE-degrading consortium consisted of 44.49% Clostridium and other potential PCE degraders, and 0.5–2.5 mg/L PCE was completely biodegraded within 4 days. The characterization of nZVI-LDH indicated that LDH was coated on the surfaces of nZVI particles with an increased surface area. The PCE removal kinetics by nZVI-LDH was well described by a second-order model, and the removal rate constant of nZVI-LDH was 0.12 L h/mg, higher than that of native nZVI (0.02 L h/mg). Interestingly, the presence of Cu 2+ improved the removal efficiency of PCE by nZVI-LDH, owing to its role as a catalyst or medium for charge transfer during reduction. Removal of PCE was enhanced by coupling the PCE-degrading consortium and nZVI-LDH. The initial removal of PCE was mainly dominated by the abiotic degradation and adsorption of nZVI-LDH, and biodegradation then played a major role in the exhaustion of nZVI-LDH. These results suggest that biodegradation coupled with nZVI-LDH has a great potential for applications in the remediation of chlorinated-solvent contaminated groundwater.
研究领域:
环境科学
·
化学工程
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIOINORGANIC CHEMISTRY AND APPLICATIONS
·
2015
·
IF 2.081
Zeyu Guan,Jinquan Wan,Yongwen Ma,Yan Wang,Yajie Shu
A novel amino-functionalized silica-coated nanoscale zerovalent iron (NZVI@SiO2-NH2) was successfully synthesized by using one-step liquid-phase method with the surface functionalization of nanoscale zerovalent iron (NZVI) to enhance degradation of chlorinated organic contaminants from anaerobic microbial system. NZVI@SiO2-NH2 nanoparticles were synthesized under optimal conditions with the uniform core-shell structure (80–100 nm), high loading of amino functionality (~0.9 wt%), and relatively large specific surface area (126.3 m2/g). The result demonstrated that well-dispersed NZVI@SiO2-NH2 nanoparticle with nFe0-core and amino-functional silicon shell can effectively remove 2,4,6-trichlorophenol (2,4,6-TCP) in the neutral condition, much higher than that of NZVI. Besides, the surface-modified nanoparticles (NZVI@SiO2-NH2) in anaerobic granule sludge system also showed a positive effect to promote anaerobic biodechlorination system. More than 94.6% of 2,4,6-TCP was removed from the combined NZVI@SiO2-NH2-anaerobic granular sludge system during the anaerobic dechlorination processes. Moreover, adding the appropriate concentration of NZVI@SiO2-NH2 in anaerobic granular sludge treatment system can decrease the toxicity of 2,4,6-TCP to anaerobic microorganisms and improved the cumulative amount of methane production and electron transport system activity. The results from this study clearly demonstrated that the NZVI@SiO2-NH2/anaerobic granular sludge system could become an effective and promising technology for the removal of chlorophenols in industrial wastewater.
研究领域:
环境科学
·
微生物学
✓ 已验证
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）