CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Zhenzhong Hu,Hongwei Gao,Guoqing Yang,Jingxia Ning,Honghong Lyu,Sheng-qi Guo,Mengmeng Zhen,Jiawei Zhang,Boxiong Shen
Fenton technology is effective in removing high-risk roxarsone (ROX) from the environment. In this study, MoS 2 -modified magnetic iron oxides were successfully synthesized to serve as catalysts for the photo-Fenton system to efficiently degrade ROX. Under light illumination, these catalysts demonstrated strong arsenic adsorption characteristics and photocatalytic activity. The catalyst 6Mo-Fe achieved a 96.15% removal of 20 mg/L ROX and an 88.95% removal of total arsenic within 120 minutes. The study evaluated the effects of catalyst dosage, H 2 O 2 dosage, initial pH, and common anions on the degradation efficiency. The integration of MoS 2 significantly improved the forbidden band width, light absorption capacity, and electrochemical impedance of iron oxides, facilitating the separation and transfer of charge carriers. MoS 2 provided abundant Mo 4+ reduction sites for Fe 3+ , which, in conjunction with the photocatalytic reaction, promoted the cyclic conversion between Fe 3+ and Fe 2+ , thereby markedly increasing the reaction rate. This study presents an innovative approach using MoS 2 -modified iron oxides for the sustainable and eco-friendly degradation of organoarsenic compounds.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
BIOMASS & BIOENERGY
·
2014
·
IF 3.411
Shams Ali Baig,Jin Zhu,Niaz Muhammad,Tiantian Sheng,Xinhua Xu
Magnetic biochar is increasingly known as a multi-functional material and the appropriate synthesis method further increase its efficient applications. In this study, the effects of synthesis methods on the fabrication of Kans grass straw/biochar (KGS/KGB) with Fe 3+ /Fe 2+ by chemical co-precipitation and subsequently pyrolyzing at 500 °C for 2 and 4 h were studied in details, and compared their As(III, V) adsorption potentials under different operating conditions. Magnetic biochars (MKGB3 and MKGB4) prepared from KGS revealed of superior Fe 3 O 4 loading, higher As(III, V) adsorption efficiency and saturation magnetization (45.7 Am 2 kg −1 ) than that of KGB (MKGB1 and MKGB2). Moreover, Thermogravimetric analysis (TGA) demonstrated three stages of decomposition and the MKGB3 and MKGB4 generated higher residual mass (>60%) at stage 3 (1000 °C) due to greater Fe 3 O 4 composite in biochar matrix and turned to be thermally more stable. As(III) and As(V) adsorption equilibrium data well fitted in Langmuir model and followed the order: MKGB4 > MKGB3 > MKGB2 > MKGB1. The maximum As(III) and As(V) adsorption capacities were about 2.0 mg g −1 and 3.1 mg g −1 , respectively. The data best fitted in pseudo-second-order ( R 2 > 0.99) rather than pseudo-first-order kinetics model indicating of more complex mechanism. The adsorption of As(III) and As(V) was found to decrease with increasing in ionic strength of competing ions and PO 4 3− was found to strongly inhibit arsenic adsorption. Highest desorption was achieved at pH 13.5 using NaOH. This study suggests that selective adsorbent synthesis method could be useful to prepare effective adsorbent for toxic metals immobilization .
研究领域:
环境科学
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材料科学
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DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 83
·67951-67961
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IF 3.84
Jin Zhu,Zimo Lou,Yu Liu,Ruiqi Fu,Shams Ali Baig,Xinhua Xu
Iron–manganese binary oxide (FeMnOx) is considered highly effective for arsenic adsorption, however, the agglomeration effect hindered its practical application. In this study, graphene has been used as a supporting matrix to disperse FeMnOx due to its huge specific surface area, and the synthesized novel composite adsorbent (FeMnOx/RGO) was employed for arsenic removal. Results demonstrated that FeMnOx/RGO (mass ratio of FeMnOx to FeMnOx/RGO nanocomposites is 45%) has larger specific surface area (411 m2 g−1) in comparison with bare FeMnOx, and showed 10.16 mg As g−1 FeMnOx and 11.49 mg As g−1 FeMnOx adsorption capacities for As(III) and As(V), respectively, with 1 mg L−1 initial concentration. Increased in the initial concentration to 7 mg L−1, the adsorption capacities of As(III) and As(V) reached to 47.05 mg As g−1 FeMnOx and 49.01 mg As g−1 FeMnOx, respectively. The removal process perfectly obeys pseudo second-order kinetic model for both As(III) and As(V). And PO43− was found to strongly inhibit arsenic adsorption. Furthermore, adsorption tests and characterization analyses confirmed that MnO2 played a key role on the oxidation of As(III), while iron(III) oxide was found crucial to As(V) removal. Electrostatic interaction and surface complexation mechanisms involved in the adsorption. These findings suggested that the adsorbent could be used in real arsenic-contaminated water treatment.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 22
·32935-32949
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IF 0
Wang Junfeng,Wang Heng,Qi Xianjin,Zhi Gang,Wang Jianhua
The high cost and low adsorption capacity of primary metal-organic frameworks (ZIF-8) limit their application in heavy metal removal. In this paper, Co/Zn bimetallic MOF materials were synthesized with excellent adsorption performance for As 5+ . The adsorption reached equilibrium after 180 min and the maximum adsorption was 250.088 mg/g. In addition, Co-ZIF-8 showed strong selective adsorption of As 5+ . The adsorption process model of Co-ZIF-8 fits well with the pseudo-second-order kinetic model ( R 2 =0.997) and Langmuir isotherm model ( R 2 =0.994), and it is demonstrated that the adsorption behavior of the adsorbent is a single layer of chemical adsorption. In addition, when the adsorbent enters the arsenic-containing solution, the surface of Co-ZIF-8 is hydrolyzed to produce a large number of Co-OH active sites, and As 5+ arrives at the surface of Co-ZIF-8 by electrostatic adsorption and combines with the active sites to generate the arsenic-containing complex As-O-Co. After four cycles, Co-ZIF-8 showed 80% adsorption of As 5+ . This study not only provides a new method to capture As 5+ in water by preparing MOF with partial replacement of the central metal, but also has great significance for the harmless disposal of polluted water.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
CHEMOSPHERE
·
2019
·
IF 5.108
Zhigang Wei,Yangfei Fang,Zhenrui Wang,Yue Liu,Yang Wu,Kai Liang,Jiahong Yan,Zhanchang Pan,Guanghui Hu
TiO 2 is one of the most cheap materials which can both adsorb arsenic and oxidize arsenite [As(III)] to arsenate [As(V)]. In this study, anatase TiO 2 crystals with different main facets such as {101}, {001} and {100} are synthesized and used to investigate arsenic adsorption kinetics, adsorption isotherms, photocatalytic oxidation (PCO) process and the pH effects. The adsorption kinetics of arsenic on TiO 2 crystals can be described by the pseudo second-order kinetic model. For the adsorption isotherms, the Langmuir model is better than the Freundlich model for arsenic on these TiO 2 crystals. For the PCO process, the rate of As(III) oxidation can be denoted by the pseudo first-order kinetic model. It should be noted that at neutral condition the adsorption and PCO rates of the three kinds of TiO 2 crystals follow the order of {101} > {001} > {100}. The pH effect is above all important for both the arsenic adsorption and its PCO. The highest PCO speed appears at high pH values such as at pH 11 or 12.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2017
·
IF 4.208
Hongyun Hu,Dunkui Chen,Huan Liu,Yuhan Yang,Hexun Cai,Junhao Shen,Hong Yao
Arsenic emission from fuel combustion and metal smelting flue gas causes serious pollution. Addition of sorbents is a promising way for the arsenic capture from high temperature flue gas. However, it is difficult to remove arsenic from SO 2 /HCl-rich flue gas due to the competitive reaction of the sorbents with arsenic and these acid gases. To solve this problem, arsenic adsorption over γ-Al 2 O 3 was studied in this work to evaluate its adsorption mechanism, resistance to acid gases as well as regeneration behavior. The results show that γ-Al 2 O 3 had good resistance to acid gases and the arsenic adsorption by γ-Al 2 O 3 could be effectively carried out at a wide temperature range between 573 and 1023 K. Nevertheless, adsorption at higher-temperature (like 1173 K) leaded to the decrease of surface area and the rearrangement of crystal structure of γ-Al 2 O 3 , reducing the active sites for arsenic adsorption. The adsorption of arsenic was confirmed to occur at different active sites in γ-Al 2 O 3 by forming various adsorbed species. Increasing temperature facilitated arsenic transformation into more stable chemisorbed As 3+ and As 5+ which were difficult to remove through thermal treatment regeneration. Fortunately, the regeneration of spent γ-Al 2 O 3 could be well performed using NaOH solution.
研究领域:
环境科学
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化学工程
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DOI
PubMed
高影响因子
WATER ENVIRONMENT RESEARCH
·
2022
·Vol. 94
·期 4
·e10714
·
IF 3.306
Yao Shi,Yifei Xing,Zhilian Song,Xueming Dang,Huimin Zhao
Fe–Mn binary oxide (FMBO) is a promising adsorbent for As(III) removal through combined adsorption and oxidation. The calcined oyster shell-supported Fe–Mn binary oxide (FMBO/OS) adsorbent was synthesized by the co-precipitation method. Results indicated that the calcined oyster shell, as a carrier, improved the stability of FMBO and its adsorption capacity for As(III). The maximum adsorption capacity of FMBO/OS on As(III) reached 140.5 mg·g −1 . Under pH 5.0 and 25°C, the removal efficiency of FMBO/OS to As(III) solution (C 0 = 10 mg·L −1 ) reached 87% within 12 h. Moreover, based on the characterization analyses, the removal mechanisms of As(III) were deduced to include the combined adsorption and oxidation process of FMBO and the synergistic effect of oyster shells. This work provides new insights into synthesizing efficient and green adsorbents to remove aqueous As(III). Meanwhile, it provides technical support for reusing waste biomass materials such as the oyster shell. Practitioner Points FMBO/OS was prepared by a simple hydrothermal co-precipitation method. The carrier alleviates the agglomeration of Fe–Mn oxides. The adsorbent shows a strong adsorption capacity of As(III) and good selectivity. The good results benefit from the synergistic effect of calcium arsenate generation. The prepared adsorbent can adsorb arsenic in real samples.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Ze Lin,Limin Jin,Yanbiao Liu,Ying Wang
During the arsenic (As) adsorption process, amino-functionalization has been widely considered as one of the effective adsorbents optimization methods, while this study reveals that imide functional groups also play a non-negligible role. Herein, magnetic carbon dots (CDs) equipped with imide (FeCD-NH) or amino functional groups (FeCD-NH 2 ) were synthesized to deduce the relationship between different configurations of amino-like functional groups and As. The results showed that FeCD-NH exhibited extraordinary As(V) adsorption behavior (with 97.80 % As(V) removal within 5 min), outperformed that equipped with amino functional groups (FeCD-NH 2 ). An array of advanced characterization techniques and density functional theory (DFT) calculation collectively revealed a dual-configuration hydrogen bond synergistic mechanism of FeCD-NH toward As(V). Different from monomorphic hydrogen bond of amino functional group, imide functional group forms abundant adsorption sites through dual-configuration hydrogen bonds to realize the ultrafast adsorption of As(V). In addition, FeCD-NH can remove As(V) from other more complex water matrices to levels below the World Health Organization (WHO) drinking water standards and the Chinese surface water standards. Therefore, this work provides a promising strategy for As decontamination by fine-tune the surface chemistry of adsorbents.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Huiping Zeng,Weihua Zhao,Siqi Sun,Xiao Sun,Yuwei Zeng,Ruixia Hao,Jie Zhang,Dong Li
In this study, we demonstrated the effective acquisition of magnetic iron oxide (MIO) for As(V) adsorption by high-temperature pyrolysis of waste iron sludge from the water treatment plant under a confined environment without adding extra chemical reagents. The operating temperature and time in the pyrolysis process were optimized to improve the yield of MIO and its As(V) adsorption capacity. MIO 500 – 2 (500 °C, 2 h) had both relatively high yield and arsenic adsorption efficiency, which was characterized by XRD and XPS as mainly γ-Fe 2 O 3 with small particle size (100–900 nm), significant mesopore (12.43 nm), high specific surface area (65.25 m 2 /g), and effective saturation magnetization intensity (14.45 emu/g). The maximum adsorption capacity was 14.2 ± 0.4 mg/g, and the removal rate could still reach about 80 % after five times of adsorbent regeneration. Considering this facile preparation route and its high yield, large-scale production of MIO from waste iron sludge is feasible, which is expected to provide a low-cost and efficient adsorbent for the treatment of arsenic-containing water in less economically developed areas.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Gao Xiao,Jun Zhang,Mingzhu Zheng,Liyin Chen,Samson Afewerki,Manna Dai,Junling Guo
Organic micropollutants in wastewater containing arsanilic acid (p-ASA) can undergo a transformation into a highly toxic inorganic arsenic, impacting both the environment and human health. Adsorption materials such as Metal-organic frameworks (MOFs) have attracted great interest, yet their production methods are often complex, costly, and time-consuming, hindering large-scale production. We introduces an innovative, high-throughput microfluidic magnifiable manufacturing approach to expedite MOFs creation, enabling rapid, continuous, and parallel expandable scalable production of MOFs with a uniform microstructure in mere minutes, significantly outpacing the traditional, intermittently operated hydrothermal synthesis. The microfluidic-generated microstructured MF-UIO-66 has better organic arsenic adsorption capacity (333.3 mg/g), and maintained an 89.2 % effectiveness even after four cycles of reuse without generating harmful by-products. When compared to UIO-66 produced via conventional hydrothermal methods, the microfluidically synthesized MF-UIO-66 showcases not only a faster and more effective removal of varying concentrations of organic arsenic but also enhanced chemical stability and longevity. The novel microfluidic fabrication strategy holds great potential for the industrial-scale production of MF-UIO-66 at reduced costs and increased yields.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
SOIL SCIENCE SOCIETY OF AMERICA JOURNAL
·
2019
·Vol. 83
·期 2
·348-356
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IF 1.997
Yurui Yang,Yuzhen Liang,Yajie You,Zecong Ding,Zhi Dang,Zhenqing Shi
Core Ideas Adsorption and desorption kinetics of As(V) on Fe and Mn oxide mixture was studied. A predictive kinetics model based on component additivity approach was developed. The kinetics model predicted the kinetic data of As(V) well for the mixed oxides. Ferrihydrite and δ-MnO2 controlled As(V) reaction kinetics differently. Arsenate [As(V)] soil contamination is a great concern worldwide because of its high toxicity, carcinogenicity, and mobility. The adsorption of As(V) on soil minerals such as ferrihydrite and δ-MnO 2 controls the transport and bioavailability of As(V) in the soil environment. A large number of studies have investigated the equilibrium and mechanisms of As(V) adsorption onto ferrihydrite and δ-MnO 2 individually. However, both ferrihydrite and δ-MnO 2 , commonly coexisting within soils has been overlooked and little information is available for the kinetics of As(V) adsorption and desorption in this mixed mineral system. Therefore, in this work, kinetics of As(V) adsorption and desorption onto ferrihydrite and δ-MnO 2 mixed minerals is studied using the stirred-flow method. A kinetics model for the mixed mineral system was developed using the component additivity approach, which incorporated the nonlinear binding of As(V) to both ferrihydrite and δ-MnO 2 simultaneously. The kinetics model successfully predicted the kinetics of As(V) adsorption and desorption in the mixed mineral system under varying solution chemistry conditions and properly accounted for the heterogeneity of the binding sites of both ferrihydrite and δ-MnO 2 . For As(V) adsorption kinetics, the ferrihydrite bidentate non-protonated sites (Fh-bi-np) played a dominant role, followed by the δ-MnO 2 binding sites and the ferrihydrite bidentate protonated sites (Fh-bi-p). After the 4-h desorption, As(V) was mainly retained on ferrihydrite binding sites. This study helps to quantitatively elucidate the kinetic behavior and mechanisms of As(V) in the Fe oxide and Mn oxide systems, thus enhancing our understanding of the fate and transport of As in soil environments.
研究领域:
环境科学
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土壤学
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Guohua Li,Xianjin Qi,Nina Yang,Xiaoxu Duan,Aimin Zhang
Molecular sieves have also been used for arsenic adsorption in recent years because of their special structure. In order to solve the problem of arsenic pollution in drinking water and/or industrial wastewater , ZSM-5/Fe adsorbent was prepared by loading iron on ZSM-5 molecular sieve. It is also used as an excellent adsorbent for removing arsenic and other heavy metal ions from industrial wastewater. At room temperature, the concentration of arsenic was reduced from 100 mg/L to 0.006 mg/L after the solution pH was adjusted to the range of weak acid to weak base (4–10) and 0.5 g of ZSM-5/Fe adsorbent was added for reacting 2 h. The adsorption capacity reached 40.00 mg/g, the adsorption efficiency reached 99.99%, reaching the national standard of drinking water. Adsorption thermodynamics, kinetics and isotherms showed that the adsorption mechanism of arsenic is heterogeneous nucleation adsorption (including electrostatic attraction and chemical precipitation). Moreover, ZSM-5/Fe adsorbent can adjust pH spontaneously by using non-skeleton Si–Al phase to achieve effective adsorption from weak acid to weak base. At the same time, ZSM-5/Fe adsorbent showed good reusability and stability in five cycles. This study provides an important idea for the application of ZSM-5 molecular sieve in many fields and the efficient removal of arsenic from drinking water and industrial wastewater.
研究领域:
环境科学
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材料科学
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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）