CHEMOSPHERE
·
2022
·
IF 8.943
Baolong Wang,Xueying Sun,Fei Lu,Yibo Shen,Ningdi Xu,Yingying Liu,Yudong Huang,Zhen Hu
Thermosetting unsaturated polyester resin (UPR) composites were found widespread industrial applications. However, the numerous stable carbon-carbon bonds in cross-linked networks made them intractable for degradation, causing the large-scale composite wastes. Here a nanoscale Fe 0 catalyst in-situ forming strategy was exploited to nondestructively recycle carbon fiber (CF) from UPR composites via Fenton-like reaction. The nano-Fe 0 catalyst employed in this strategy activated H 2 O 2 for removing UPR, featuring mild conditions and efficient degradation ability. Aiming at facile growth of the catalyst, a porous UPR was achieved by the hydrolysis of alkalic system. The nanoscale Fe 0 catalyst was subsequently formed in-situ on the surface of hydrolyzed resin by borohydride reduction. Benefiting from fast mass transfer, the in-situ grown nano-Fe 0 showed more efficient degradation ability than added nano-Fe 0 or Fe 2+ catalyst during Fenton-like reaction. The experiments indicated that hydrolyzed resin could be degraded more than 90% within 80 min, 80 °C. GC-MS, FT-IR analysis and Density functional theory (DFT) calculation were conducted to explained the fracture processes of carbon skeleton in hydrolyzed resin. Especially, a remarkable recovery process of CF from composites was observed, with a 100 percent elimination of resin. The recycled CF cloth exhibited a 99% strength retention and maintained the textile structure, microtopography , chemical structure, resulting in the nondestructive reclaim of CF. This in-situ formed nanoscale Fe 0 catalytic degradation strategy may provide a promising practical application for nondestructively recycle CF from UPR composites.
研究领域:
材料科学
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环境工程
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
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IF 6.735
Hongxia Liu,Jiayi Yao,Lianhong Wang,Xinghao Wang,Ruijuan Qu,Zunyao Wang
Fenitrothion (FNT), a common organophosphorus pesticide, has been regarded as a contaminant because it is adverse to the environment. In this study, we chose the highly effective technique, persulfate (PS) activation by zero-valent iron powder (Fe 0 ), to degrade FNT. The effects of several experimental parameters including PS and Fe 0 dosages, pH, temperature, and common natural water constituents were systematically investigated via kinetics studies. We found that the addition of Fe 0 significantly enhanced the FNT degradation by PS under any of the studied conditions. Under the optimal conditions of [FNT]:[PS] = 1:500 (molar ratio), Fe 0 :PS = 1:1.5 (molar ratio), pH = 3.0, and 35 °C, 10 mg L −1 of FNT could be completely degraded in 45 min and 20 μg L −1 FNT was removed 96 ± 0% in 12 h. Sulfate (SO 4 − ) radicals led the degradation of FNT in the Fe 0 /PS system. Twelve transformation products of FNT were determined by LC-MS/MS analysis, and the vulnerable sites in FNT were predicted by a density-functional-theory-based descriptor, 2∑(C ri HOMO ) 2 , to illustrate the generation of initial reaction products. The overall acute and chronic toxicity of FNT and its products, as predicted by the ecological structure–activity relationship model (ECOSAR), decreased in the Fe 0 /PS process. The present work proves that FNT could be efficiently degraded by Fe 0 -activated PS, which may also contribute to future research on the removal of other organophosphorus pesticides.
研究领域:
环境科学
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农药化学
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水处理技术
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DOI
高影响因子
Environmental Science-Nano
·
2024
·Vol. 11
·期 7
·3019-3032
·
IF 5.8
Jianyu Gong,Ruiyuan Xue,Yake Xu,Hao Lv,Nan Wang,Xiaoming Su
In this research, a bimetallic compound of silver-modified nano zero-valent iron (Ag/Fe0) was synthesized and utilized to degrade pentabromophenyl ether (BDE209) under various environmental conditions with the presence of citric acid (CA). Liquid chromatography-mass spectrometry (LC-MS) analysis revealed twelve intermediate products formed during the degradation of BDE209. Both the Fe0–CA system and 0.2% Ag/Fe0–CA system showcased a degradation efficiency of 68.7% and 72.7% respectively in a liquid solution after 24 hours of treatment, along with a 9.1% and 18.2% total organic carbon (TOC) removal. Amid soil conditions, degradation rates reached 66.4%, 54.1%, and 50.5% respectively for initial BDE concentrations of 5 ppm, 10 ppm and 15 ppm in the presence of a degradation system comprising 30 g kg−1 Ag/Fe0 and sodium citrate/CA (NaCA/CA) over 45 days. The potential environmental impacts of this process were assessed using ryegrass as a phytotoxicity marker in soil, wherein the measured chlorophyll and malondialdehyde (MDA) contents indicated that the addition of Ag/Fe0 successfully mitigated stress damage caused by BDE209. Furthermore, Ag/Fe0 has the capability to permeate the cell wall of ryegrass roots and establish interconnections. STEM-EDS patterns revealed that Ag was more readily accumulated inside of the cells compared to Fe. In conclusion, this study introduces an innovative approach for the safe and efficient oxidative degradation of BDE209 under both aquatic and terrestrial environmental conditions.
研究领域:
环境科学
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植物学
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毒理学
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产品关联
DOI
高影响因子
International Journal of Environmental Science and Technology
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2024
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IF 3
Cui Y. P.,Huang Q.,Cao J. G.,Dong W.,Cui X. X.,Lu Y.,Li Y. J.,Huang Z. Q.
Fe 0 -based heterogeneous Fenton process has been increasingly developed for organic pollutants removal. However, the reaction activity of Fe 0 catalyst is easily weakened due to the formation of dense oxide layer or the precipitation of iron hydroxides on the surface. Herein, the effect and mechanism of magnetic field (MF), visible light (Vis), nitrilotriacetic acid (NTA) and inorganic salt ions on the Fe dissolution and dimethyl phthalate (DMP) degradation in the Fe 0 /H 2 O 2 system were investigated. The results showed that the magnetic field (100 mT), NTA and inorganic salt ions effectively enhanced the dissolution of Fe from the surface of iron filings, and visible light significantly accelerated the Fe 3+ /Fe 2+ cycle in the aqueous phase, which promoted the decomposition of H 2 O 2 by Fe 2+ to generate •OH and further enhanced the degradation of DMP. DMP was nearly completely degraded within 60 min in the pH range of 3.0–9.0, indicating the MF/Vis/NTA/Fe 0 /H 2 O 2 system effectively broadened the pH range of Fenton-like system. The iron sand column tests proved that the MF/solar/NTA/Fe 0 /H 2 O 2 system was effective for the treatment of waste leachate reverse osmosis concentrate as a typical actual high-salt wastewater, in which the removal rates of chemical oxygen demand and humic acid reached 84.5 and 90.6%, and the chromaticity was almost completely removed. Generally, the activation mechanism of Fe 0 -based heterogeneous photo-Fenton system was set up and an effective method for organic pollutant removal and high-salt wastewater treatment was provided.
研究领域:
环境科学
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化学工程
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2026
·
IF 7.8
Zhiqian Lin,Huaiqing An,Liyuan Qian,Yun Wang,Haibin Lin,Xiaofei Wang,Guojun Zou,Jinlong Zhu,Songbai Han
Propane dehydrogenation (PDH) is a key process for propylene production, but conventional catalysts are often constrained by high cost, environmental impact, and limited stability under harsh reaction conditions. Fe-based catalysts offer a cost-effective and sustainable alternative due to their intrinsic ability to activate C–H bonds in alkanes. However, precise control over the oxidation state and coordination environment of Fe species to balance PDH activity and stability remains challenging. Herein, we develop a molten-salt-assisted synthesis strategy integrated with CeO2–x-mediated interfacial engineering to finely tune the structural and electronic properties of Fe species supported on Al2O3. The molten salt medium enables uniform dispersion and controlled crystallization of Fe3O4, effectively mitigating its over-reduction during high-temperature H2 treatment. The subsequent incorporation of CeO2–x modulates the local electronic structure of Fe3O4, inducing a controlled partial reduction to metallic Fe0 and forming a well-defined Fe0–Fe3O4 dual-interface architecture. This interfacial electronic reconstruction enriches the electron density of low-valent Fe sites, facilitating efficient charge transfer during propane activation and promoting rapid propylene desorption. As a result, the optimized catalyst demonstrates accelerated PDH kinetics, high propylene selectivity, and enhanced resistance to coking. This work establishes a scalable route for constructing dual-interface active sites, providing a general design principle for low-cost, high-performance PDH catalysts.
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产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2025
·
IF 11.3
Shichao Cai,Jiawei Zhao,Yurou Tan,Zhongkuan Wu,Bo Chen,Feng He
In this study, we synthesized microscale sulfidated zerovalent iron (S-mZVI) with controllable mackinawite (FeS) content up to nearly 100 wt % and investigated the roles of FeS and Fe0 for arsenite (As(III)) sequestration under aerobic conditions. Batch experiments show that FeS and Fe0 contents determine the kinetics and longevity of As removal by S-mZVI, respectively. The Fe0/FeS galvanic cell accelerates the consumption of Fe0 by dissolved oxygen (DO) while preserving FeS to preferentially remove As as sulfide, which is protected from oxidation by Fe0. In column studies, mZVI and S0 were mixed in sand to form S-mZVI in situ. Results of sequential extraction of reacted S-mZVI particles from different column zones and run stages further indicate that As formed as sulfide by S-mZVI, which was then oxidized by DO after Fe0 depletion to form As-iron (hydr)oxides. X-ray absorption near-edge structure characterization confirmed that As sulfide is mainly in the form of realgar (As4S4). S-mZVI (2 wt % of column sand) reduces total As from 2 mg/L to 10 μg/L, up to 300 bed volumes, with a residence time of 70 min. In situ synthesis and cost advantages make S-mZVI a promising method to address As contamination issues worldwide.
研究领域:
环境科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Jialin Liang,Xiaojian Liao,Maoyou Ye,Zhijie Guan,Zhihua Mo,Xian Yang,Shaosong Huang,Shuiyu Sun
The stabilization and dewaterability of waste activated sludge (WAS) are essential factors for downstream disposal or reuse. Herein, two types of zero-valent metals, zero-valent iron (Fe 0 ) and zero-valent aluminum (Al 0 ), were compared for their ability to activate peroxymonosulfate (PMS) during the WAS conditioning process, with the effects of PMS activation by these two metals on WAS dewaterability and the potential environmental risks evaluated. Results showed that compared to Al 0 /PMS treatment, Fe 0 /PMS treatment achieved superior WAS dewaterability and reduced operational costs. Using PMS combined with Fe 0 and Al 0 treatments under optimal conditions, the water content (Wc) of dewatered sludge decreased to 55.7 ± 2.7 wt% and 59.4 ± 1.3 wt%, respectively. Meanwhile, application of the Fe 0 /PMS treatment system reduced the total annual cost by approximately 33.1%, compared to the Al 0 /PMS treatment. Analysis of the dewatering mechanism demonstrated that in the Fe 0 /PMS treatment, Fe 3+ /Fe 2+ flocculation played an important role in the enhancement of WAS dewatering, while sulfate radical ( S O 4 • − ) oxidation was the dominant factor for WAS dewaterability improvement in Al 0 /PMS treatment. The greater enhancement of WAS dewaterability by Fe 0 /PMS treatment, was mainly attributed to more efficient reduction of hydrophilic extracellular polymeric substances (EPS) and an increase in surface charge neutralization. Environmental risk evaluation results indicated that Fe 0 /PMS and Al 0 /PMS treatments both effectively alleviated the environmental risks of heavy metals and faecal coliforms in dewatered sludge. Overall, this study proposes a novel perspective for the selection of an optimal PMS activator in sludge treatment .
研究领域:
环境科学
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污水处理
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产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Hui Su,Xudan Dou,Dandan Xu,Li Feng,Yongze Liu,Ziwen Du,Liqiu Zhang
The massive use of personal medicines makes them widely enter the aquatic environments and cause pollution, drawing a great deal of attention over the last few years. In this study, a novel nano Fe 0 -loaded superfine powdered activated carbon (Fe 0 @SPAC) was prepared via a simple ball milling method. Fe 0 @SPAC showed a rapid and effective removal for aqueous carbamazepine (CBZ) via the process of synergistic adsorption and persulfate (PDS) activation. The removal efficiency of CBZ (30 mg L −1 ) could be up to 96% by Fe 0 @SPAC (0.05 g L −1 ) with the presence of PDS (2 mM), and the maximum pseudo-first-order rate constant was 0.12 min −1 . The performance of Fe 0 @SPAC was superior to other reported iron-bearing activator materials, and its dosage was much lower. Fe 0 @SPAC was also effective to remove other typical drug pollutants and had excellent reusability in five cycles. The loaded Fe 0 could activate PDS to generate OH and SO 4 − , which played the major role for CBZ removal. It is interesting that carbon base of Fe 0 @SPAC could also activate PDS via surface defects , making the minor contribution to CBZ degradation. Besides, Fe 0 @SPAC showed rapid and high adsorption for CBZ due to the superfine particle diameter, partially contributing to CBZ removal. Finally, the possible break sites of CBZ and its degradation pathway were proposed based on DFT theoretical calculation and product identification. Fe 0 @SPAC would be a promising material for the removal of drug pollutants, and this study may help understand the mechanisms of synergistic adsorption and persulfate activation by carbon composite material.
研究领域:
环境科学
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水处理
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材料科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Teng Zong,Lin Li,Yujia Han,Chaojie Wang,Yu Kang,Ming Tian,Chuande Huang,Xiaodong Wang
It is of challenge to improve the coke resistance of Fe-based oxygen carriers (OC) due to the conflict of Fe 0 sites for CH 4 activation but causing coke formation. The present work reported that carbon-tolerant of Y 3 Fe 2 Al 3 O 12 -T garnets (YFAO-T, T indicates calcination temperature) could be remarkably promoted by tuning calcination temperature for chemical looping partial oxidation of methane (CLPOM). This was because the encapsulation degree of Fe 0 (1-Fe 0 exposed /Fe 0 total ) became larger with reduction from 19% to 79% due to decreased oxygen mobility leading to more surface oxygen-deficiency for YFAO-T calcined at higher temperature, which not only resulted in Fe 0 sites for CH 4 activation but also accessible lattice oxygen of garnet shell for carbon oxidation formed on Fe 0 sites. Comparatively, the encapsulation of Fe 0 was destroyed leading to progressively naked Fe 0 with large particle size with reduction for YFAO-T calcined at lower temperature, which induced carbon deposition due to inaccessible lattice oxygen of garnets.
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
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Jing Yang,Xiaoqin Zhang,Jia Tang,Jinlan Li,Aiping Zhang
In this study, molybdenum disulfide (MoS 2 ) was used to enhance a zero-valent iron/hydrogen peroxide (Fe 0 /H 2 O 2 ) Fenton-like system, which was able to remove refractory organic matter from the effluent produced during the treatment of landfill leachate by a membrane bioreactor (MBR). The MoS 2 /Fe 0 /H 2 O 2 system could efficiently remove refractory organic matter (i.e., fulvic acid-like substances and humic-like substances) from the MBR effluent and also exhibited a strong synergistic effect. Under the conditions of initial pH = 3, H 2 O 2 = 40 mmol/L, Fe 0 = 0.4 g/L, MoS 2 = 0.1 g/L, and t = 30 min, compared with a Fe 0 /H 2 O 2 system, the absorbance UV 254 , chroma (CN), and total organic carbon (TOC) removal rates in MBR effluent treated with MoS 2 /Fe 0 /H 2 O 2 increased to 48.68%, 63.85%, and 35.85%, respectively. Through the identification of reactive oxygen species (ROS), the hydroxyl radical (HO • ) concentration and an analysis of the effective utilization rate of H 2 O 2 , as well as an analysis of the morphology of the material, the distribution of Fe compounds, valence changes, and the Fe ion concentration , it was proven that MoS 2 promoted the cycling of Fe 3+ /Fe 2+ in the Fe 0 /H 2 O 2 process. The addition of MoS 2 promoted the Fe 3+ /Fe 2+ cycling reaction through the exposed Mo 4+ active center, significantly promoting the decomposition of H 2 O 2 and the formation of HO • . The MoS 2 /Fe 0 /H 2 O 2 system was able to remove a wide range of aromatic organics, indicating the wide applicability of the system. This study developed a new method for the efficient removal of refractory organic matter from landfill leachate.
研究领域:
环境科学
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污水处理
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化学工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Xiaowen Zhang,Hong Wen,Qianwen Huang,Yujiao Tan,Zihao Sun,Yilong Hua,Xiaoyan Wu,Mi Li
Developing a materials to realize the selective adsorption and long-term immobilization of uranium is of great significance for the effective remediation of uranium-containing wastewater. Herein, we half-filled Fe 0 into SGB-NH 2 mesoporous channels to prepare a composite of Fe 0 and amino-functionalized silica (Fe 0 @SGB-NH 2 ), and used to the selective removal of uranium in solution under aerobic conditions . It was found that solutions containing 10 mg/L U(VI) could be purified 98.96% by Fe 0 @SGB-NH 2 in the presence or absence of Na + , K + , Mg 2+ , SO 4 2 − , NO 3 − , HCO 3 − and Cl − at pH 5–9. Compared with Fe 0 , its saturation magnetization decreased from 81.24 emu/g to 0.78 emu/g, while the specific surface area increased from 47.895 m 2 /g to 504.404 m 2 /g, successfully preventing the agglomeration and rapid corrosion of Fe 0 without reducing its activity. More interestingly, the consumption of Fe 0 @SGB-NH 2 was only 1/28 of untreated Fe 0 when identical uranium removal efficiency was achieved. Further mechanistic studies indicated that U(VI) was firstly selectively captured by amino groups on the surface of the material and then reduction or adsorption in the pore, the long and narrow mesoporous channels reduce the possibility of uranium re-oxidation, thereby significantly reducing its re-release efficiency from 21.5% to only 1.73%. Encapsulation of Fe 0 within SGB-NH 2 channels was found to facilitate faster removal rate and higher U(VI) reduction ratio, and reduce uranium re-oxidation, thus benefit the long-term immobilization of uranium in contaminated groundwater.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2023
·
IF 7.8
Xiaoqin Zhang,Jing Yang,Yueli Chen,Jia Tang,Aiping Zhang
Fe 0 and MoS 2 can synergistically activate H 2 O 2 to generate free radicals for the removal of refractory organic compounds. This study aims to evaluate the Fe 0 -H 2 O 2 -MoS 2 process for the removal of refractory organic compounds from bio-treated landfill leachate (BTL) under continuous operation mode . The results show that the dosage of H 2 O 2 , Fe 0 and MoS 2 all affect the removal effect of the Fe 0 -H 2 O 2 -MoS 2 process on refractory organics during continuous operation. The removal rates of total organic carbon , absorbance at 254 nm and chroma at an initial pH of 3, [H 2 O 2 ] of 5 mM, Fe 0 of 0.4 g/L, MoS 2 of 0.4 g/L and reaction time of 60 min were 65.83%, 85.11% and 93.14%, respectively. The Fe 0 -H 2 O 2 -MoS 2 process can not only effectively destroy the complex structure of refractory organic compounds in the BTL treatment but also reduce the biological toxicity of BTL to a certain extent. In addition, a high organic removal rate can still be maintained during the long-term dynamic reaction process. Therefore, the Fe 0 -H 2 O 2 -MoS 2 process has excellent performance in removing refractory organic compounds from BTL under continuous operation conditions.
研究领域:
环境科学
·
废水处理
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）