CHEMOSPHERE
·
2019
·
IF 5.108
Yiqun Chen,Chuanjing Lin,Yiyi Zhou,Li Long,Lili Li,Min Tang,Zizheng Liu,Ivan P. Pozdnyakov,Li-Zhi Huang
The transformation of roxarsone (ROX) during UV disinfection with Fe(III) has been investigated. Fe(OH) 2+ , as the main Fe(III) species at pH = 3, produces HO under UV irradiation leading to the oxidation of ROX. Dissolved oxygen plays a very important role in the continuous conversion of generated Fe 2+ to Fe 3+ , which ensures a Fe(III)-Fe(II) cycle in the system. The presence of Cl − /HCO 3 − /NO 3 − has little influence on the ROX transformation, whereas PO 4 3− achieves an obvious inhibitory effect. The transformation of ROX leads to the formation of inorganic arsenic consisting of a much higher amount of As(V) than As(III). LC-MS analysis shows that phenol, o -nitrophenol and arsenic acid were the main transformation products . Both the radical scavenger experiment and electron spin resonance data confirm that the HO is responsible for ROX transformation. The toxic transformation products are found to have potential environmental risks for the natural environment, organisms and human beings.
研究领域:
环境科学
·
毒理学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Ying Liu,Rentao Xu,Xiaolong Gong,Cheng Yao,Shunlong Pan
The increased discharge of organoarsenic to natural waters, brings significant risks to ecosystems and human health. It is curial to rapidly transform organoarsenic to harmless arsenate (As(V)) before conventional coagulation-sedimentation treatment. In this study, the roxarsone (ROX) was destroyed to form As(V) with almost 100 % transformation rate and reaction rate of 0.43 min −1 via the CoFe 2 O 4 /peracetic acid (PAA) system. Specifically, PAA was primarily activated to form singlet oxygen ( 1 O 2 ) and organic radicals (R-O·) by Co(II)/Co(III) redox cycle existed on the CoFe 2 O 4 surface, the presence of iron (Fe) in the CoFe 2 O 4 facilitated the transformation of Co(III) to Co(II), and then that reactive oxygen species (ROS) was employed to mineralize ROX. The presence of common anions, and natural organic matters (NOM) hardly inhibit the degradation of ROX. Furthermore, the catalytic efficiency of CoFe 2 O 4 /PAA system remained above 94 % after five cycles. These findings suggest that the CoFe 2 O 4 /PAA system is a promising technique for enhanced arsenic decontamination.
研究领域:
环境科学
·
毒理学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
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
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2014
·Vol. 22
·期 6
·4654-4659
·
IF 2.757
Yao Lixian,Huang Lianxi,He Zhaohuan,Zhou Changming,Li Guoliang,Deng Xiancai
Roxarsone (ROX), a world widely used feed organoarsenic additive in animal production, can be excreted as itself and its metabolites in animal manure. Animal manure is commonly land applied with phosphorous (P) fertilizer to enhance the P phytoavailability in agriculture. We investigated the accumulation of As species in garland chrysanthemum ( C. coronarium ) plants fertilized with 1 % ( w / w , manure/soil) chicken manure bearing ROX and its metabolites, plus 0, 0.05, 0.1, 0.2, 0.4, and 0.8 g P 2 O 5 /kg, respectively. The results show that As(III) was the sole As compound in garland chrysanthemum shoots, and As(III) and As(V) were detectable in roots. Elevated phosphate level supplied more As(V) for garland chrysanthemum roots through competitive desorption in rhizosphere, leading to significantly enhanced accumulation of As species in plants. As(III) was the predominant As form in plants (85.0∼90.6 %). Phosphate could not change the allocation of As species in plants. Hence, the traditional practice that animal manure is applied with P fertilizer may inadvertently increase the potential risk of As contamination in crop via the way ROX → animal → animal manure → soil → crop.
研究领域:
植物学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
WATER RESEARCH
·
2023
·
IF 12.8
Sheng Gong,Jingnan Yang,Qinyi Pan,Xuran Liu,Quan Zhang,Dongbo Wang
The conventional oxidation-adsorption methods are effective for the removal of roxarsone (ROX) but are limited by complicated operation, toxic residual oxidant and leaching of toxic metal ions. Herein, we proposed a new approach to improve ROX removal, i.e., using the FeS/sulfite system. Experimental results showed that approximately 100% of ROX (20 mg/L) was removed and more than 90% of the released inorganic arsenic (As(V) dominated) was adsorbed on FeS within 40 min. This FeS/sulfite system was a non-homogeneous activation process, and SO 4 ·− , ·OH and 1 O 2 were identified as reactive oxidizing species with their contributions to ROX degradation being 48.36%, 27.97% and 2.64%, respectively. Based on density functional theory calculations and HPLC-MS results, the degradation of ROX was achieved by C-As breaking, electrophilic addition, hydroxylation and denitrification. It was also found that the released inorganic arsenic was adsorbed through a combination of outer-sphere complexation and surface co-precipitation, and the generated arsenopyrite (FeAsS), a precursor to ecologically secure scorodite (FeAsO 4 ·2H 2 O), was served as the foundation for further inorganic arsenic mineralization. This is the first attempt to use the FeS/sulfite system for organic heavy metal removal, which proposes a prospective technique for the removal of ROX.
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
INORGANICA CHIMICA ACTA
·
2022
·
IF 3.118
Zong-Ying Li,Hong-Xia Zhang,Tian-Sheng He,Hong-Xin Jiang,Xiao-Wei Liu,Li-Na Zhu,Xiao-Zeng Li,De-Ming Kong
A two-dimensional (2D) water-stable Cd (II) luminescent coordination polymer ( 1 ), namely {[CdLCl 2 ]} n , was obtained through assembly of a new 2-deoxy- d -ribose derivative ligand (L) with CdCl 2 , 1 showed high stability in water. Further investigation showed that 1 can be used as luminescent probe for the organoarsenic compound Roxarsine (ROX) with high selectivity and sensitivity, high quenching constants (K SV = 2.34 × 10 4 M −1 ), low limits of detection (LOD) (0.16 μM) and good recyclability in aqueous media. In addition, this luminescent probe can detect some inorganic harmful ions (Fe 3+ , Cr 2 O 7 2− and CrO 4 2− ) with excellent versatility. The detection mechanism was proved that the quenching was caused by competitive absorption and resonance energy transfer effect between 1 and analytes. More strikingly, a simple 1 -based test strip was developed owing to the quick response and recyclability of 1 , which shows visible quenching signals under UV light even when analytes concentrations are as low as 5 μM. This work has provided an effective method for the design of multifunctional CP luminescent sensors for pollutants detections in aqueous media.
研究领域:
化学
·
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Environmental Science-Nano
·
2017
·Vol. 4
·期 11
·2134-2143
·
IF 6.047
Chen Tian,Jian Zhao,Jing Zhang,Shengqi Chu,Zhi Dang,Zhang Lin,Baoshan Xing
Roxarsone (ROX) is an emerging arsenic pollutant due to its potential degradation into highly toxic inorganic arsenic species in the environment. Adsorbents which can capture ROX with both high capacity and affinity are urgently needed. Herein, a nanocomposite of nano-Fe3O4 and three-dimensional graphene (Fe3O4@RGO) was designed, aiming to simultaneously attract arsenate and benzene groups in ROX. Characterization of the nanocomposite revealed that Fe3O4 nanoparticles (20–50 nm) with exposed (400) planes were highly dispersed on the graphene support. Adsorption experiments showed that Fe3O4@RGO had higher adsorption capacity, affinity, and adsorption rate towards ROX than pristine materials and efficiently removed ROX from both simulated natural and waste waters. The adsorption mechanism was confirmed as a synergetic interaction of As–Fe coordination, hydrogen bonding and π–π interaction. X-ray photoelectron spectroscopy (XPS) and extended X-ray absorption fine structure (EXAFS) results suggested that the As–Fe complexes and hydrogen bonds between Fe3O4@RGO and ROX were stronger than those in pristine nano-Fe3O4, due to the greater number of surface hydroxyls and shorter As–Fe atomic distance in Fe3O4@RGO. The π–π interaction between ROX and the graphene part in Fe3O4@RGO was also enhanced. This study provided a novel idea for designing materials to remove pollutants with both inorganic and organic moieties, such as phenylarsonic acid compounds, from water.
研究领域:
环境科学
·
材料化学
·
水污染控制
·
纳米技术
·
分析化学
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2023
·
IF 8.8
Jie-wen Ma,Gui-wen Liu,Jia-Yu Zhai,Ke-qian Zhao,Ya-qing Wu,Rui-lian Yu,Gong-ren Hu,Yu Yan
Roxarsone (3-nitro-4-hydroxyphenylarsonic acid, Rox), a widely used organoarsenical feed additive, can enter soils and be further biotransformed into various arsenic species that pose human health and ecological risks. However, the pathway and molecular mechanism of Rox biotransformation by soil microbes are not well studied. Therefore, in this study, we isolated a Rox-transforming bacterium from manure-fertilized soil and identified it as Pseudomonas chlororaphis through morphological analysis and 16S rRNA gene sequencing. Pseudomonas chlororaphis was able to biotransform Rox to 3-amino-4-hydroxyphenylarsonic acid (3-AHPAA), N -acetyl-4-hydroxy- m -arsanilic acid (N-AHPAA), arsenate [As(V)], arsenite [As(III)], and dimethylarsenate [DMAs(V)]. The complete genome of Pseudomonas chlororaphis was sequenced. PcmdaB, encoding a nitroreductase, and PcnhoA, encoding an acetyltransferase, were identified in the genome of Pseudomonas chlororaphis . Expression of PcmdaB and PcnhoA in E. coli Rosetta was shown to confer Rox(III) and 3-AHPAA(III) resistance through Rox nitroreduction and 3-AHPAA acetylation , respectively. The PcMdaB and PcNhoA enzymes were further purified and functionally characterized in vitro . The kinetic data of both PcMdaB and PcNhoA were well fit to the Michaelis-Menten equation, and nitroreduction catalyzed by PcMdaB is the rate-limiting step for Rox transformation. Our results provide new insights into the environmental risk assessment and bioremediation of Rox(V)-contaminated soils.
研究领域:
环境微生物学
·
分子生物学
·
土壤科学
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Xiaolin Bi,Nan Zhao,Meina Guo,Weihua Zhang,Fengping Zhou,Wuming Xie,Ruigang Wang
Roxarsone (ROX), a livestock growth enhancer, poses environmental and health hazards due to its remarkable stability, making traditional degradation methods ineffective. To tackle this issue, a novel Fenton-like composite, composed of nanoscale zero-valent iron supported on γ-aluminum oxide (nZVI/γ-Al 2 O 3 ), was synthesized to boost ROX degradation. Results demonstrated nearly complete mineralization of the ROX organic matrix within just 180 min, facilitated by the Lewis acidity sites of γ-Al 2 O 3 . Significantly, this composite exhibited selective adsorption of released AsO 4 3− ions on its surface, forming FeAsO 4 and Fe-As-Al complexes. It also established an internal redox cycle involving Fe(0), Fe(II), and Fe(III), ensuring a continuous and efficient generation of primary reactive oxygen species (·OH and O 2 ·− ). Thus, a simultaneous redox process occurred on the composite surface can be attributed to the synergy of the reducibility of nZVI and the oxidation catalyzed by ·OH and O 2 ·− . Initially, the nitro group of ROX was reduced by nZVI, forming more hydrophilic o-aminophenol, favoring subsequent oxidation and mineralization. Simultaneously, the As-C bonds in ROX were oxidized, yielding AsO 4 3− , which was subsequently adsorbed over extended reaction times. This innovative approach offers a potential solution for treating wastewater contaminated with metalloid-organic composite pollutants, addressing the environmental and health concerns associated with ROX residues.
研究领域:
环境科学
·
化学
·
生物学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2018
·
IF 11.698
Shanshan Su,Chengjin Cao,Yaping Zhao,Dionysios D. Dionysiou
Roxarsone (ROX) is extensively used as a feed additive which tends to leave toxic inorganic arsenic (As) in the natural environment. A composite of reduced graphene oxide and carbon nanotubes was impregnated with goethite designated as α-FeOOH@GCA and tested as an integrated catalyst and adsorbent for ROX decontamination. Nearly 100% of the ROX was transformed in α-FeOOH@GCA activating persulfate (PS) under UV 365 irradiation system at relatively low dosage of the α-FeOOH@GCA catalyst (250 mg L −1 ) in 120 min. The As(V) released in the ROX oxidation was simultaneously adsorbed onto the surface of the α-FeOOH@GCA. A possible ROX transformation pathway is proposed. The As(V) adsorbed on catalyst was recovered and used to form an efficient Ag 3 AsO 4 photocatalyst. This work further extends the oxidation-adsorption technology in solving organoarsenical contamination without producing secondary pollution.
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
RSC Advances
·
2016
·Vol. 6
·期 85
·82040-82048
·
IF 3.289
Yuefei Ji,Yuanyuan Shi,Deyang Kong,Junhe Lu
Organoarsenicals such as roxarsone (ROX) are extensively utilized in the poultry industry, and land application of poultry litter is an important route by which arsenics are introduced into the environment. In the present study, degradation of ROX and structurally related nitrophenols by a heat activated persulfate (PS) oxidation process, one in situ chemical oxidation process (ISCO), was systematically explored. The effects of temperature, PS dosage, pH and natural water constituents (i.e., fulvic acid, Cl−) on the degradation of ROX were investigated. Products analysis by solid phase extraction (SPE) and liquid chromatography-electrospray ionization-triple quadrupole mass spectrometry (LC-ESI-MS/MS) revealed that 2,4-dinitrophenol (2,4-DNP) and 2,4,6-trinitrophenol (2,4,6-TNP) were generated as major intermediate products, suggesting denitration–renitration process occurred during SO4˙−-based oxidation of ROX. Interestingly, the formation of polynitration by-products was further confirmed in heat activated persulfate oxidation of nitrophenols. Formation of inorganic arsenics during ROX degradation was measured by inductively coupled plasma-mass spectrometry (ICP-MS). It was evident that the arsenic substituent of ROX was converted to As(V). On the basis of the intermediate products identified, detailed mechanisms and transformation pathways for ROX oxidation were proposed. Results manifest that heat activated PS oxidation could be an efficient approach to treat ROX contamination. However, post-treatment is necessary for complete removal of As(V) to minimize ecotoxicological risks.
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
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yuxin Li,Li Liu,Wei Li,Yeqing Lan,Cheng Chen
In this study, a novel Co 3 O 4 -La 2 O 2 CO 3 @C composite was fabricated via the calcination of Co-La bimetallic MOFs at 500 °C, and was employed to efficiently activate peroxymonosulfate (PMS) for simultaneous oxidation of roxarsone (ROX) and adsorption of concomitant inorganic arsenic. Approximately 100% of ROX (50 μmol L −1 ) was degraded by PMS (0.5 mmol L −1 ) activated with Co 3 O 4 -La 2 O 2 CO 3 @C (0.2 g L −1 ) at initial pH 6 within 10 min. Meanwhile, the produced inorganic arsenic was almost completely adsorbed within 90 min. The maximum adsorption capacity of As(V) by Co 3 O 4 -La 2 O 2 CO 3 @C was determined to be high up to 275.4 mg g −1 . Co 3 O 4 -La 2 O 2 CO 3 @C also exhibited superior stability. During 6 rounds, the degradation efficiency of ROX and the removal efficiency of the total As maintained almost 100% and more than 97%, respectively. SO 4 − and OH were confirmed to be the reactive oxygen species (ROS) in charge of the degradation of ROX and the conversion of As(III) to As(V). The investigation of the adsorption mechanism revealed that the As species were combined with La species via ligand and anion exchange, resulting in the formation of La-O-As bond. Furthermore, the practical application potential of Co 3 O 4 -La 2 O 2 CO 3 @C in the ROX degradation and the in-situ adsorption of the released arsenic were further evaluated in a continuous flow column reactor. The Co 3 O 4 -La 2 O 2 CO 3 @C composite as catalyst and adsorbent may offer a feasible strategy for the implementation of organoarsenic degradation and produced inorganic arsenic adsorption.
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）