CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Ning Li,Yu Tian,Jianhui Zhao,Wei Zhan,Jinying Du,Lingchao Kong,Jun Zhang,Wei Zuo
Efficient and selective capture of phosphate from wastewater is critical to inhibit water eutrophication and supplement phosphate sources. Adsorption, as a simple and environmental-friendly approach, can realize phosphate recovery from wastewater. In order to enhance capture efficiency, adsorption capacity and reusability, magnetic 3D Fe 3 O 4 @ZnO nanocubes with uniform active sites were tailor-designed by hydrothermal-atomic layer deposition method for phosphate removal from water under weak magnetic field (WMF). Ultrafast capture of phosphate (94.8% in 5 min) was achieved by Fe 3 O 4 @ZnO composite under WMF due to the improvement of surface area and electrostatic interaction. More importantly, the synergistic effect of Lorentz force and electrostatic attraction promoted the transfer of phosphate anions to Fe 3 O 4 @ZnO surface and pores in one step, breaking the adsorption limitation induced by intraparticle diffusion. Isotherms fitting indicated that multilayer adsorption occurred on Fe 3 O 4 @ZnO surface with superior adsorption capacity of 100.3 mg/g. Moreover, the Fe 3 O 4 @ZnO exhibited excellent selectivity competing with co-existing matters in wastewater. Mechanism exploration found that inner-sphere complexation by ligand-exchange played a major role in the adsorption process. This easily separable and recyclable adsorbent was demonstrated to be a promising candidate for efficient phosphate capture in real sewage. Also, this study provided a novel approach with WMF application in magnetic separable adsorption system for contaminants remediation.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Water
·
2021
·Vol. 13
·期 13
·1724
·
IF 3.103
Liping Liang,Fenfen Xi,Liubiao Cheng,Weishou Tan,Qiang Tang,Xu Meng,Zhenjiong Wang,Bo Sun,Aijie Wang,Jian Zhang
The coupling use of the heterogeneous Fenton-like process (zero-valent iron (Fe0)/H2O2) and weak magnetic field (MWF) for bisphenol A (BPA) abatement was systematically investigated in this study. Though both the Fe0/H2O2and WMF-Fe0/H2O2processes are sensitive to pH, WMF remarkably enhanced BPA removal under the pH range of 3.0–6.0 by 0.5–9.5 times. The characterization of Fe0confirmed the role of WMF in promoting the corrosion of Fe0. Radicals, rather than Fe intermediates, were responsible for BPA degradation. Due to the presence of Cl–as the background ions and its reactivity towards HO•, reactive chlorine species (RCS, i.e., Cl•and Cl2•−) were produced and considerably contributed to BPA degradation. In addition, ~37% and 54% of degraded BPA was ascribed to RCS in the presence of 2 and 100 mM of Cl−, respectively. However, 1.9 mg/L of ClO3−was detected in the presence of 2 mM of Cl−in the WMF- Fe0/H2O2process. HCO3−could diminish ClO3−generation significantly through transforming RCS. The concentration of ClO3−decreased by 74% and 82% with dosing 1 and 10 mM HCO3−, respectively. The results of this study suggest that the WMF-Fe0/H2O2process is a promising approach for BPA removal.Keywords:bisphenol A;zero-valent iron;hydrogen peroxide;weak magnetic field;chloride
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
WATER RESEARCH
·
2024
·
IF 11.4
Yunxuan Chen,Jun Nan
Abandoning the costly development of new membrane materials and instead directly remodeling the naturally occurring cake layer constitutes a dynamic, low-cost, long-lasting, and proactive strategy to "fight fouling with fouling". Several optimization strategies, including coagulation/modified magnetic seed loading and applying a weak magnetic force (0.01T) at the ultrafiltration end, improved the anti-fouling, retention, and sieving performances of conventional ultrafiltration process during the treatment of source water having complex natural organic matter (NOMs) and small molecule micropollutants. Two modified magnetic seeds we prepared were composite nano-seed particles (Fe 3 O 4 @SiO 2 -NH 2 (FS) and Fe 3 O 4 @SiO 2 @PAMAM-NH 2 (FSP)). Aim of the study was to regulate the formation of cake layer via comprehensive testing of the antifouling properties of optimized processes and related mechanistic studies. It was found to be essential to enhance the interception of xanthate and tryptophan proteins in the cake layer for improving the anti-fouling performance based on the correlation and redundancy analyses, while the use of modified magnetic seeds and magnetic field showed a significant positive impact on water production. Blockage modeling demonstrated the ability to form a mature cake layer during the initial filtration stage swiftly. This mitigated the risk of irreversible fouling caused by pore blockage during the early stage of coagulation-ultrafiltration. Morphologically, the reconstructed cake layer exhibited elevated surface porosity, an internal cavity channel structure, and enhanced roughness that can promote increased water flux and retention of water impurities. These optimized the maturity of the cake layer in both time and space. Density Functional Theory (DFT), Extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) theory, and Modified Extended Derjaguin-Landau-Verwey-Overbeek (MDLVO) calculations indicated aggregation behavior of matter on the cake layer to be enhanced effectively due to magnetic seed loading. This is mainly due to the strengthening of polar interactions, including hydrogen bonding, π-π* conjugation, etc., which can happen between the cake layer loaded with FSP and the organic matter. Under the influence of a magnetic field, magnetic force energy (VMF) significantly impacts the system by eliminating energy barriers. This research will provide innovative strategies for effectively purifying intricate source water through ultrafiltration while controlling membrane fouling.
研究领域:
环境科学
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材料科学
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水处理工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Yang Wu,Lifeng Lin,Fidèle Suanon,Anyi Hu,Ya-Nan Sun,Zhi-Min Yu,Chang-Ping Yu,Qian Sun
The aim of this study was to quantify the removal of halogenated pollutants (using triclosan as a model pollutant) from aqueous solution by zero-valent iron coupled with a weak magnetic field. We determined the removal efficiency of triclosan from a sodium sulfate solution at different pH values under both aerobic and anaerobic conditions. The removal of triclosan followed pseudo-first-order kinetics in both the presence and absence of a weak magnetic field. The calculated rate constants indicated higher removal efficiencies of triclosan under the aerobic condition compared to the anaerobic condition. In addition, increase of triclosan removal from acidic solutions was achieved with the assistance of weak magnetic field. X-ray diffraction and X-ray photoelectron spectroscopy analysis indicated that FeO(OH) and Fe 3 O 4 were the main aerobic transformation products, suggesting that the zero-valent iron surfaces were completely oxidized. The aerobic and anaerobic transformation products of triclosan were analyzed by liquid chromatography tandem mass spectrometry. The results indicated that the application of a weak magnetic field could be an efficient and cheap treatment process to improve the removal of halogenated pollutants by zero-valent iron, which may be developed for future use.
研究领域:
环境科学
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污染控制
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2018
·
IF 6.735
Shenghua Chen,Feifei Wang,Wenhai Chu,Xin Li,Hongbin Wei,Naiyun Gao
Chloroacetamides (CAMs) as a class of highly toxic nitrogenous disinfection by-products (N-DBPs) have been widely detected in drinking water. It has been reported that weak magnetic field (WMF) could improve the removal ability of zero-valent iron (ZVI) to some pollutants, but CAMs removal by ZVI coupled with WMF has never been studied. This study through oxic batch experiments was executed to investigate the effect of WMF on trichloroacetamide (TCAM) removal by different doses of ZVI under different pH levels and to explore how WMF works on TCAM removal for the first time. The results showed that the WMF improved TCAM removal by ZVI and the strengthening effect of WMF was more significant at lower ZVI dose or higher pH conditions. The formation of trichloroacetic acid indicated the occurrence of TCAM hydrolysis. Chlorine mass balance was observed in TCAM and its potential products, dichloroacetamide, monochloroacetamide, and chloride, indicating these were all the products and a dechlorination process occurred when TCAM contacted with ZVI. By calculating the yields of hydrolytic products and dechlorinated products, it was determined that dechlorination of TCAM was the dominant reaction for TCAM removal by ZVI with and without WMF, while hydrolysis reaction played a minor role. Mechanism analysis showed that the WMF promoted TCAM hydrolysis through impacting the electromigration within the oxide scale and improving the migration of paramagnetic oxygen to the surface of magnetized ZVI. Taken together, ZVI coupled with WMF is a potential effective technology for TCAM removal in effluent of chlorination.
研究领域:
环境科学
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水处理工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 56
·期 2
·1386-1400
·
IF 3.553
Tong Zhe,Lu Hailin,Guo Feifei,Lei Wenxing,Dong Mochen,Dong Guangneng
The CNTs@Fe 3 O 4 hybrids were synthesized via a modified co-precipitation method and aligned along the through-thickness of carbon fabrics-reinforced epoxy composites (CFRPCs) by applying a weak magnetic field. The effects of the length, orientation and concentration of CNTs@Fe 3 O 4 on the mechanical and tribological properties of CFRPCs were investigated. The results showed that the modified co-precipitation method decreased the size of Fe 3 O 4 nanoparticles (approximately 10 nm in diameter), promoting the dispersion of CNTs@Fe 3 O 4 in epoxy resin. The alignment of CNTs@Fe 3 O 4 hybrids significantly increased the interlaminar shear strength (ILSS) and hardness of CFRPCs. The long CNTs@Fe 3 O 4 can more effectively improve the ILSS of CFRPCs compared to short CNTs@Fe 3 O 4 . Besides, the addition of aligned CNTs@Fe 3 O 4 hybrids significant improves the tribological properties of CFRPCs. Compared to long CNTs@Fe 3 O 4 -reinforced CFRPCs, the short CNTs@Fe 3 O 4 -reinforced CFRPCs show the best tribological properties. The properties anisotropy of CNTs@Fe 3 O 4 and high CNTs@Fe 3 O 4 concentration in near surface of CFRPCs are the main reason for the improvement in tribological properties of CFRPCs.
研究领域:
材料科学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2020
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IF 6.551
Ning Li,Mengting He,Xukai Lu,Lan Liang,Rui Li,Beibei Yan,Guanyi Chen
A valence-state heterojunction Mn 3 O 4 /γ-MnOOH was synthesized for norfloxacin (NOR) degradation under concurrent visible light and magnetic field. The charge carriers could transfer between the valence state components facilely, inhibiting recombination of photo-induced electron-holes significantly. Efficient NOR degradation by Mn 3 O 4 /γ-MnOOH was realized at 98.8% (rate constant of 0.0720 min −1 ) within 60 min under magnetic field assisted visible light. In neutral media, the positively charged NOR and negatively charged Mn 3 O 4 /γ-MnOOH would arrange in an oriented manner in the presence of magnetic field, providing more active sites for NOR during photocatalysis . Moreover, the opposite Lorentz forces contributed to the attractive interactions between NOR and Mn 3 O 4 /γ-MnOOH, accelerating NOR degradation with lower active energy. Quenching experiment showed that ∙O 2 − and h + played dominant roles in NOR degradation. Attractively, this study shed new lights on an innovative strategy of magnetic field assisted photocatalysis for refractory contaminants remediation from water.
研究领域:
环境科学
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材料科学
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光催化技术
✓ 已验证
DOI
高影响因子
WATER RESEARCH
·
2014
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IF 5.323
Xinmei Xiong,Bo Sun,Jing Zhang,Naiyun Gao,Jimin Shen,Jialing Li,Xiaohong Guan
Weak magnetic field (WMF) and Fe 0 were proposed to activate PS synergistically (WMF-Fe 0 /PS) to degrade dyes and aromatic contaminants. The removal rates of orange G (OG) by WMF-Fe 0 /PS generally decreased with increasing initial pH (3.0–10.0) and increased with increasing Fe 0 (0.5–3.0 mM) or PS dosages (0.5–3.0 mM). Compared to its counterpart without WMF, the WMF-Fe 0 /PS process could induce a 5.4–28.2 fold enhancement in the removal rate of OG under different conditions. Moreover, the application of WMF significantly enhanced the decolorization rate and the mineralization of OG. The degradation rates of caffeine, 4-nitrophenol, benzotriazole and diuron by Fe 0 /PS were improved by 2.1–11.1 fold due to the superimposed WMF. Compared to many other sulfate radical-based advanced oxidation technologies under similar reaction conditions, WMF-Fe 0 /PS technology could degrade selected organic contaminants with much greater rates. Sulfate radical was identified to be the primary radical species responsible for the OG degradation at pH 7.0 in WMF-Fe 0 /PS process. This study unraveled that the presence of WMF accelerated the corrosion rate of Fe 0 and thus promoted the release of Fe 2+ , which induced the increased production of sulfate radicals from PS and promoted the degradation of organic contaminants . Employing WMF to enhance oxidation capacity of Fe 0 /PS is a novel, efficient, promising and environmental-friendly method since it does not need extra energy and costly reagents.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2022
·
IF 10.753
Yinxu Wang,Andac Armutlulu,Hui Lin,Maolin Wu,Weijuan Zhang,Ruzhen Xie,Bo Lai
In this study, novel porous sodalite (SOD) was synthesized through Reactive Oxidation Species (ROS) route from industrial waste lithium silicon fume (LSF) to stabilize nZVI (SOD@nZVI), and used as an outstanding persulfate (PS) activator for efficient organic degradation. Characterization results revealed nZVI evenly distributed on SOD via ion-exchange, and the fabricated SOD@nZVI exhibited high stability and superior reactivity over a wide pH range of 2–12 during oxidation reaction. The mechanism responsible for fast organic degradation in the SOD@nZVI+PS system was carefully investigated, and weak magnetic field (WMF) and friction were found to contribute to improved SOD@nZVI performance. The fast redox cycle of Fe 2+ /Fe 3+ on SOD@nZVI can be stimulated by changing the mixing condition and altering the friction layer to harvest mechanical energy during the reaction, which can maximum persulfate activation to generate more reactive radicals for organic fast degradation. This study is of great significance, as it offers a practical route turning waste into excellent PS activator for in-situ organic pollution remediation, as well as proposing a new idea to maximum PS activation performance by manipulating the inner lining of reactor.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
PubMed
高影响因子
CHEMOSPHERE
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2022
·
IF 8.943
Guang Yang,Zhiyang Cheng,Huanzhong Bao,Lianbao Zhang,Hongwei Zhang,Hui Jia,Jie Wang
It was important to regulate the formation of Fe-hydroxyl during ferrate (Fe(VI)) oxidation and hydrolysis which was beneficial for interfacial adsorption of natural organic matter (NOM). Based on the influence of weak magnetic field (WMF) on the physical and chemical characteristics of particles in chemistry. This study investigated the effect of WMF on Fe(VI) oxidation and Fe(III) flocculation performance by regulating iron species during hydrolysis, for NOM removal. Results indicated WMF efficiently accelerate the removal of NOM that the reactions rate constants in magnetization system was twice as much as the control group. With the structure and electrochemical analysis, WMF enhanced Hydrogen-bond and caused much polar hydroxyl groups combined with iron ions, further triggered Fe(III) transformed to amorphous Fe-hydroxide and ferrihydrite with large specific surface area and high surface activity which removed the pollutants by adsorption and co-precipitation, instead of crystalloid Fe 2 O 3 and Fe 3 O 4 . In addition, the nucleation aggregation behavior and interaction energy of Fe-(oxy)hydroxide revealed that the lower free energy obtained in magnetization system, could lead to higher nucleation rate, and promoted the aggregation. WMF increased hydrophobicity of Fe-(oxy)hydroxides, further more easily adsorbed with humic acid (HA) and bovine serum albumin (BSA) with lower interaction energies than in control group. The selective removal mechanism of Fe-(oxy)hydroxide hardly to aggregate with pollutants which caused by the difference of electrostatic interaction, was illustrated that electronegativity HA and SA were liable to electrostatically attract with Fe-(oxy)hydroxide and removed while the low electronegativity BSA was difficult to remove which its attraction was weakened.
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
Materials Today Advances
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2024
·
IF 8.1
Ting Sai,Pengfei Wang,Xiaoying Gu,Xueping Xu,Jinji Sun,Jing Ye
Cobalt-based amorphous alloys (Co-MG) demonstrate ultra-high permeability and remarkably-low power loss, positioning them as promising candidates for shielding (near-) static magnetic fields and addressing accuracy limitations in extremely-weak magnetic measurements. However , the brittleness and poor understanding about magnetic performance below 100 Hz have impeded their widespread adoption. To integrate satisfied processing, magnetic and mechanical performances, polystyrene-grafted Co-MG composites are developed. Compared with permalloy-1J85, Co-MG-( g -PS_35 %) composite exhibits 40 % increase in initial permeability, 48 % increase in saturation magnetization, 71 % reduction in remanence within shielding area. In contrast to Mn–Zn ferrite, Co-MG-( g -PS_35 %) composite demonstrates the power loss and μ ″/ μ ′ 2 values lower by an order of magnitude, resulting in magnetic noises 85 % lower at 1 Hz. Furthermore, the resultant composite maintains similar processing-rheological behaviors and mechanical properties compared with bulk polystyrene. It provides an innovative solution to expand real-world applications for biomagnetic detection, and overcome the sensitivity limitation of extremely-weak magnetic measurement.
研究领域:
材料科学
·
磁学
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复合材料
·
生物磁检测
✓ 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）