Atmospheric Pollution Research
·
2018
·
IF 2.152
Longchao Liang,Zhidong Xu,Guangle Qiu,Pan Wu,Ruixue Zhang
Arsenic (As) is considered a carcinogenic toxin, and nonferrous metal smelting activities can release significant quantities of As, causing an increase in As levels in the environment. A total of 221 samples of moss belonging to 5 species in 4 families were collected from the Wanshan District, the world third largest mercury mining area, in Guizhou Province, southwestern China, for analysis of total As (tAs) concentrations and As speciation. The results indicated that the tAs concentrations in these mosses ranged from 0.67 to 9.6 mg kg −1 , with an average of 2.4 ± 1.7 mg kg −1 . The dominant species of As in these mosses were inorganic forms of arsenite (As(III)) and arsenate (As(V)) with a total percentage of 87%, whereas the concentrations of organic forms (monomethylarsonic acid (MMA) and dimethylarsinic acid (DMA)) were relatively low, with percentages of 11.8% and 6.0%, respectively. A significant correlation (r = 0.766, p < 0.01) was observed between As(V) and tAs. In the spatial distribution pattern of As, high concentrations of As in mosses were centralized around historical Hg retorting sites in the town of Wanshan, the villages of Gouxi and Yanwuping and sites downwind of these locations, suggesting that historical intensive Hg mining activities might be the most possible source of atmospheric As.
研究领域:
环境科学
·
植物学
·
生态毒理学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Chuxuan Zhao,Zixin Liu,Yi Wu,Juntao Guo,Peng Huang,Yifei Wang,Yeheng Leng,Ivan P. Pozdnyakov,Jing Xu,Feng Wu
The widespread used organic arsenic pesticides and veterinary drugs have drawn attention for decades. Its photochemical transformation in the surface water contributes to its degradation and the formation of products. The effect of co-existent components like anthropogenic reagents (e.g. ethylenediaminetetraacetatic acid, EDTA) on the photochemical transformation has still to be investigated in depth. Fe(III)-EDTA complex is a common and abundant complex in surface water. In this work, UVA light and simulated sunlight have been used as light sources to explore the effect of Fe(III)-EDTA on the photodegradation of p -arsanilic acid (ASA), used as an organic arsenic feed additive. Whereas ASA hardly absorbs UVA light and can only be directly photolyzed by simulated sunlight, the Fe(III)-EDTA complex is photoactive under either light source. At pH 6, the presence of Fe(III)-EDTA complex enhances the photodegradation efficiency of ASA from 0% to ca. 23% after 180 min reaction under UVA light irradiation, and from 30% to ca. 58% after 45 min reaction under simulated sunlight irradiation. Appropriate amount of EDTA enhances the photodegradation efficiency, whereas excessive EDTA suppresses the initial reaction rate. Mechanistic study has revealed contributions from direct photolysis and photochemical reactions of Fe(III)-EDTA and Fe(III)–OH complexes. Generated •OH has been confirmed as the important contribution. Photodegradation products include inorganic arsenic, organic arsenic, and other organic by-products, and the proportions of these products vary in different light-induced systems due to the diverse reaction pathways. The results of this work improve our understanding of the risks of residual ASA in the environment, allow prediction of its migration and transformation, and show how organic arsenic livestock and poultry feed additives might be removed.
研究领域:
环境科学
·
化学
✓ 已验证
DOI
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
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
WATER RESEARCH
·
2024
·
IF 11.4
Shiqi Tian,Yuwei Ma,Yuanyuan Xu,Yingzi Lin,Jun Ma,Gang Wen
Dissolved Mn(III), as a potent one-electron transfer oxidant, is ubiquitous in natural waters and sediments and actively involved in the transformation of organics in biogeochemical processes and water treatment. However, the important role of Mn(III) has long been overlooked because of its short life. This study was the first to investigate the performance of Mn(III) in organoarsenic transformation and to highlight the environmental implications. Both homogeneous and heterogeneous Mn(III)-based systems were effective to remove p -arsanilic acid ( p -ASA, 15 μ M) with degradation efficiency approaching 40.4 %–98.3 %. Two degradation pathways of p -ASA were proposed, in which As-C bond and amino group were vulnerable sites to Mn(III) attack, leading to the formation of more toxic arsenate (As(V)) and nitarsone. Through transforming organoarsenic to inorganic arsenic species, the removal efficiency of total arsenic and dissolved organics were enhanced to 65.1 %–95.5 % and 16.6 %–36.6 %, respectively, by post-treatment of coagulation or adsorption, accompanied with significant reduction of cytotoxicity and environmental risks. Particularly, polymeric ferric sulfate and granular activated alumina showed superior performance in the total As removal. Moreover, oxidation efficiency of Mn(III) was hardly affected by common cations and anions (e.g., Ca 2+ , Mg 2+ , NH 4 + , NO 3 ˉ, SO 4 ˉ), halide ions (e.g., Clˉ, Brˉ) and natural organic matter, showing high robustness for organoarsenic removal under complicated water matrices. Overall, this study shed light on the significance of Mn(III) to the fate of organoarsenics in manganese-rich environments, and demonstrated the promising potential of Mn(III)-based strategies to achieve targeted decontamination in water/wastewater purification.
研究领域:
环境科学
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水处理工程
·
毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2016
·
IF 4.836
Anan Wang,Ying Teng,Xuefeng Hu,Longhua Wu,Yujuan Huang,Yongming Luo,Peter Christie
Diphenylarsinic acid (DPAA) is a major contaminant in environments polluted by chemical weapons and abandoned after World Wars I and II and poses high risks to biota but remediation methods for this contaminant are rare. Here, the photodegradtion of DPAA was studied under high-pressure Hg lamp irradiation. DPAA was degraded completely into inorganic arsenic species in 30 min under UV-C irradiation. The photodegradation of DPAA depended mainly on its direct photolysis through excited-state DPAA. By contrast, the generation of 1 O 2 during the photodegradation of DPAA was confirmed by electron paramagnetic resonance (EPR) studies, but 1 O 2 had little effect on the photodegradation of DPAA. Phtotodegradation of DPAA was also studied in soil leachates and groundwater and the photolytic rate of DPAA was controlled by the total organic carbon (TOC) content in soil leachates and by the NO 3 − concentration in groundwater. Finally, studies on the effects of common solutes on the photodegradation of DPAA show that Cl − can increase the photolytic rate of DPAA by prolonging the lifetime of excited-state DPAA. Moreover, NO 3 − , NO 2 − , and humic acid (HA) can decrease the photolytic rate of DPAA by suppressing the production of excited-state DPAA. This research shows the detailed mechanism of DPAA photodegradation and provides a new and effective method for DPAA decontamination.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials
·
2023
·Vol. 16
·期 24
·7636
·
IF 3.4
Binxian Gu,Haijie Zhang,Meng Ye,Ting Zhou,Jianjian Yi,Qingsong Hu
As a kind of emerging contaminant, organoarsenic compounds have drawn wide concern because of their considerable solubilities in water, and the highly toxic inorganic arsenic species formed during their biotic and abiotic degradation in the natural environment. Thus, the effective removal and studying of the adsorption mechanism of organoarsenic compounds are of significant urgency. In this work, MnFe2O4and MnFe2O4/graphene were prepared through a facile solvothermal method. From the results of the Transmission Electron Microscope (TEM) characterization, it can be found that MnFe2O4nanoparticles were uniformly distributed on the surface of the graphene. And the specific surface area of the MnFe2O4/graphene was about 146.39 m2g−1, much higher than that of the MnFe2O4(86.15 m2g−1). The interactions between organoarsenic compounds and adsorbents were conducted to study their adsorption behavior and mechanism. The maximum adsorption capacities of MnFe2O4/graphene towards p-arsanilic acid (p-ASA) and roxarsone (ROX) were calculated to be 22.75 and 30.59 mg g−1. Additionally, the ionic strength, negative ions, and humus were introduced to investigate the adsorption performance of organoarsenic compounds. Electrostatic adsorption and surface complexation are the primary adsorption mechanisms on account of X-ray photoelectron spectroscopy (XPS) and the Fourier-transform infrared spectroscopy (FT-IR) analysis. This research extends the knowledge into studying the interaction between organoarsenic species and hybrid nanomaterials in the natural environment.Keywords:MnFe2O4;graphene;adsorption;p-arsanilic acid;roxarsone
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
Frontiers of Environmental Science & Engineering
·
2025
·Vol. 19
·期 8
·1-13
·
IF 6.4
Shi Lin,Zhan Cetao,Bai Wenjing,Wang Wei,Yuan Shoujun,Hu Zhen-Hu
Arsanilic acid ( p -ASA), an organoarsenic additive found in livestock wastewater, can release toxic inorganic arsenic into the environment. While bioelectrochemical systems have proven effective in decomposing organoarsenics, managing the resulting inorganic arsenic remains a challenge. This study demonstrated the feasibility of a two-stage bioelectrochemical process designed to facilitate p -ASA degradation and in situ recover inorganic arsenic from contaminated livestock wastewater. It consisted of two sequential stages: (I) anodic stimulation for p -ASA degradation and (II) reversing electrode polarities for the cathodic reduction of inorganic arsenic. In Stage I, the anode significantly enhanced the degradation of p -ASA, resulting in 18 μg/L of As(III) and 700 μg/L of As(V) released into the bulk solution. In Stage II, the cathode further reduced the As(III) and As(V) to 8.9 and 35.5 μg/L, respectively, through the synergistic action of the cathode and suspended microbes. The inorganic arsenic was recovered as a layer of As(V)-O on the cathode. Microbial analysis indicated that Alcaligenes was responsible for the degradation of p -ASA, while Anaerobacillus and Desulfitibacter played key roles in reducing As(V) and As(III) on the cathode, respectively. This study provided a promising alternative approach for the removal of organoarsenics and in situ recovery of inorganic arsenic from organoarsenic-bearing wastewater.
研究领域:
环境科学
·
微生物学
✓ 已验证
DOI
高影响因子
Environmental Science-Nano
·
2019
·Vol. 6
·期 12
·3590-3600
·
IF 7.704
Yunyun Xu,Jiaxin Lv,Yao Song,Xiaoyu Zhou,Chen Tian,Xujia Hong,Yuepeng Cai,Cunyuan Zhao,Zhang Lin
As an emerging micropollutant, organoarsenic has caused global ecosystem pollution, due to its degradation to highly toxic inorganic arsenic in the environment. Therefore, to remove the low-concentration organoarsenic from arsenic compounds from water, materials with high adsorption affinity are in urgent need. Herein, we reported an amino-modified metal–organic framework (MOF) with defects (UiO-66-D-NH2) to adsorb two typical organoarsenic forms p-arsanilic acid (p-ASA) and roxarsone (ROX). The adsorption affinity of UiO-66-D-NH2 was 3.8 and 3.0 times higher than that of original UiO-66 and defective UiO-66 without amino modification (UiO-66-D), while the removal rate exceeded 99.1% when the initial concentration of organoarsenic decreased to 1 mg L−1. UiO-66-D-NH2 also showed excellent adsorption behavior in simulated wastewater, with residual arsenic concentrations lower than 0.54 μg L−1. Mechanism studies showed a cooperation of the defects and –NH2 groups in UiO-66-D-NH2. The defects provided more Zr–OH sites in the metal node, leading to transformation of the As–O–Zr coordination from monodentate mononuclear to bidentate binuclear configuration, while –NH2 groups formed hydrogen bonds with both p-ASA and ROX as a secondary interaction to further reinforce the as-formed As–O–Zr complex. This work revealed that making cooperation by defect creation and amino modification could be an effective method to enhance the adsorption affinity of MOFs to low-concentration organoarsenic.
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 SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 27
·期 11
·12017-12029
·
IF 3.056
Lv Yuancai,Huang Siyi,Huang Guofu,Liu Yifan,Yang Guifang,Lin Chunxiang,Xiao Gao,Wang Yonghao,Liu Minghua
Given their considerable solubility in water and potentially high toxicity to human health, organoarsenic compounds have become an emerging contaminant. Herein, a heterogeneous Fenton process mediated by SiO 2 -coated nano zero-valent iron (SiO 2 -nZVI) was employed to simultaneously remove the p -arsanilic acid ( p -ASA, a typical organoarsenic compound) and the released arsenic. The initial pH value significantly influenced on the degradation of p -ASA and at the optimal pH (3.0), p -ASA (10 mg L −1 ) could be completely oxidized to As(V), NH 4 + , and plentiful phenolic compounds such as phenol and p -hydroquinone via the cleavage of C–N and C–As bonds within 60 min in pure water. Meanwhile, although the formed lepidocrocite and magnetite on the surface of SiO 2 -nZVI significantly limited the reutilization, they played a vital role in the adsorption of the released As(V) and the residual arsenic levels in the effluent were as low as 0.031 mg L −1 , meeting both the drinking water standard of the World Health Organization (WHO) and the surface water standard of China (0.05 mg L −1 ). Furthermore, high-level dissolved organic matters (DOM) (> 2 mg C L −1 ) exhibited strong interference with both the oxidation of p -ASA and adsorption of arsenic, but the interference could be eliminated by increasing the SiO 2 -nZVI dosage or adding H 2 O 2 . Importantly, this system could completely remediate p -ASA in a short time and simultaneously avoid the secondary pollution caused by inorganic arsenic, which was significant for the remediation of organoarsenic pollutants in swine wastewater.
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
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Jia Wang,Xintao Ding,Xinquan Zhou,Zhuwei Liao,Jiayi Cai,Siqi Wang,Ali Jawad,Jerosha Ifthikar,Lie Yang,Songlin Wang,Zhuqi Chen
Organoarsenics in soil urgently desired careful remediation. Unfortunately, it did not receive enough attention. Herein, we report a versatile Fe 2+ /Urea Hydrogen Peroxide (UHP) process for not only organoarsenic remediation but also nitrogen supplement in soil. Insight mechanism was firstly studied in water. Roxarsone (ROX) was efficiently degraded by 99.6% following a kinetics of v= 33.91 × [ROX]× [UHP] 1.2175 × [Fe 2+ ] 1.8990 . Aromatic ring cleavage of ROX was realized, resulting in a satisfying mineralization performance. After degradation processes, 88.5% of total arsenic was removed from the solution at pH 5.0 via adsorption processes by generated Fe(OH) 3 particles. The particles showed much higher adsorption capacity to inorganic arsenic species than that to organoarsenic. The degradation of ROX facilitated the immobilization of total arsenic. The remediation was further carried out in soil. Satisfying removal of ROX (95.5%) and immobilization of total arsenic (89.3%) was achieved. More importantly, 94.2%− 94.6% less arsenic was transferred into the lettuce. By the injection of Fe 2+ /UHP, a sixteen times higher concentration of total nitrogen was achieved. The growth of lettuce was significantly promoted due to the multi-functions including arsenic immobilization and nitrogen supplement. The achievements suggested Fe 2+ /UHP system potentials in applications for organoarsenic remediation in soil and also soil amelioration.
研究领域:
环境科学
·
农业科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
ACS ES&T Water
·
2024
·
IF 4.8
Yanli Kong,Fan Lu,Aihua Huang,Zhonglin Chen,Jiangya Ma
In this study, iron–aluminum covalently bonded modified activated carbon (CAFM@PAC) was prepared by a constant-temperature infiltration method, which demonstrated highly efficient removal capability against p-aminobenzoic acid (p-ASA). The complete degradation of 30 μM p-ASA was achieved within 6 h at a dosage of 2.0 g/L CAFM@PAC, which was attributed to the enhanced adsorption mechanism involving electrostatic, hydrogen bonding, and π–π EDA interactions, as well as synergistic interactions between the Fe/Al/C fractions for the in situ production of H2O2 under acidic conditions, which triggered a Fenton-like reaction for the generation of ROS. The Fe/Al covalent structure promotes rapid electron transfer and accelerated Fe2+/Fe3+ cycling, resulting in a highly efficient H2O2 generation system. DFT calculations and product analysis confirmed that the C3 and C6 sites of p-ASA were the key sites for ROS attack. CAFM@PAC exhibited strong environmental adaptability and high recyclability, and maintains excellent removal efficiencies even in a multi-ionic system, with very low leakage of metal ions. CAFM@PAC showed excellent removal efficiency even in a polyconic system and very low metal ion leakage, demonstrating its potential as a sustainable water treatment material.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Kaiyang Liu,Zhongyuan Huang,Jinlan Dai,Yanting Jiang,Guifang Yang,Yifan Liu,Chunxiang Lin,Yuancai Lv,Minghua Liu
Herein, an amino-modified electrospun nanofibrous cellulose membrane (CA-PVAm) was prepared and employed to adsorb the typical organoarsenic contaminants (roxarsone (ROX), p -arsanilic acid ( p -ASA), and phenylarsonic acid (PAA)). The SEM, FT-IR, and XPS results showed that the CA-PVAm composed of abundant nanofibres and owned ample functional groups such as NH 2 , OH, and C O groups. The batch experiments demonstrated that the CA-PVAm exhibited excellent adsorption performance on ROX (186.22 mg g −1 ), p -ASA (69.15 mg g −1 ), and PAA (62.77 mg g −1 ), which were 15.98, 6.83, and 6.25 folds larger than those of the pristine CA. In addition, the adsorption process of ROX, p -ASA, and PAA on CA-PVAm accorded with the Langmuir model and obeyed the pseudo-second-order model with intraparticle diffusion. Meanwhile, the adsorption of ROX and PAA was endothermic process, but the exothermic process was observed during the p -ASA adsorption. Furthermore, the main adsorption mechanisms involved electrostatic interactions and hydrogen-bonding interactions. The formed stable six-membered structure between NH 2 and NO 2 groups could significantly enhance the hydrogen-bonding interactions between CA-PVAm and ROX molecule, resulting in evident improvement in ROX adsorption. Importantly, the CA-PVAm displayed outstanding reusability (4 cycles) and rapid desorption rate. This study probably provides an important theoretical and experimental basis for the remediation of the emerging organic pollutants.
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
危险品化学品经营许可证（带存储）