MICROCHEMICAL JOURNAL
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2026
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IF 5.2
Keyan Wei,Chang-ye Hui,Jinwen Ling,Wenjun Luo,Jiaqiong Xiong,Yuting Chen,Yan Guo
A single-plasmid dual-color biosensor for As(III) and Hg(II) visual detection. • Detection limits near or below drinking water regulatory thresholds. • Independent blue and purple pigments enable direct color discrimination. • Validated for environmental water matrices including seawater samples. A novel dual-color whole-cell biosensor was engineered for simultaneous visual detection of As(III) and Hg(II) within a single microbial host. The biosensor integrates an As(III)-responsive ArsR module driving indigo biosynthesis and an Hg(II)-responsive MerR module driving deoxyviolacein (DV) biosynthesis into a single plasmid designated pAs-indigo-Hg-DV. Upon exposure, the engineered Escherichia coli TOP10 generates distinct blue and purple pigments with absorption maxima at 620 nm and 570 nm, respectively. The system achieved limits of detection of 0.39 μM for As(III) (linear range 0.39–6.25 μM) and 0.49 nM for Hg(II) (linear range 7.8–125 nM), both approaching or falling below the respective drinking water regulatory limits. By using two independent color outputs from a single host, a dual-color biosensor for microscopic differential detection of two toxic metals was achieved, addressing the key unmet need of a flexible multi-channel multiplexed whole-cell biosensing system. The sensor supports naked-eye preliminary screening in a standard 96-well microplate format without dependence on instrumentation. It exhibited excellent Hg(II) selectivity and maintained robust performance in surface water and seawater matrices. This pigment-based dual-target strategy offers a low-cost, high-throughput platform for rapid co-exposure assessment of toxic heavy metals, providing a practical complement to conventional instrumental analysis and advancing the development of innovative biosensors for environmental monitoring. Download: Download high-res image (164KB) Download: Download full-size image
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高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Yueyang Wang,Mingzhu Jin,Weiwei Lu,Fangfen Jing,Xinyang He,Jianchao Xie,Rongtai Yu
The mechanism from the molecular level and the selectivity for the removal of metal ions from aqueous has become a hotspot in current water treatment . In this study, a sulphydryl-modified hollow polymer adsorbent was designed with intrinsic amine and grafted sulphydryl groups for efficient uptake of Cr(VI), As(III), Cd(II), and Pb(II) by taking advantage of their properties of abundant functional groups, discrete hollow chambers, and high porosity. Interestingly, the benzenoid amine/quinoid imine functional groups have a stronger affinity for Cr(VI) than Cd(II) or As(III) and Pb(II). The formation of approximately 65.7% Cr(III) indicates the redox reaction from Cr(VI) to Cr(III). The electron-donating comes from benzenoid amine and oxidized to quinoid imine or protonated oxidized nitrogen units (-N = + ) with Cr(VI) reduced to Cr(III) for the increase of more than double of quinoid imine and a new functional group of -N = + . Ion exchange between –COO - groups and As(III)/Cd(II), the chelation of –SH groups for Pb(II)/As(III) are plausible mechanisms.
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高影响因子
LANGMUIR
·
2023
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IF 3.9
Yueyang Wang,Weiwei Lu,Fangfen Jing,Mingzhu Jin,Xinyang He,Yuchen Xue,Yajun Hu,Rongtai Yu
The development of efficient adsorbents for heavy metal pollution, especially five toxic heavy metals, has attracted great research interest. Polymer-based adsorbents have aroused research value for their abundant functional groups and high porosity to the ability to capture metal ions. We designed a sulfhydryl-functionalized polymer microcomposite to take up Cr(VI), As(III), Cd(II), and Pb(II). The adsorption capacity achieved was 64.2 mg g–1 for Cr(VI), 44.9 mg g–1 for As(III), 35.5 mg g–1 for Cd(II), and 18.2 mg g–1 for Pb(II). Langmuir and Sips isotherm model is dominant for As(III), Cd(II), and Pb(II) adsorption. Pseudo-second-order kinetic models can better describe the adsorption behavior of Cr(VI), implying that chemisorption is accompanied by Cr(VI) adsorption. Cr(VI) simultaneous reduction to Cr(III) through the benzenoid amine oxidate pathway was the dominant mechanism, precipitation for Cd(II) adsorption was convinced, and chelation between As(III)/Pb(II) and─SH group and complexation between Pb(II) and C═O or benzene hydroxyl were a plausible mechanism for As(III) and Pb(II) adsorption.
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PubMed
高影响因子
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
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2020
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IF 3.57
Sittipranee Ploychompoo,Qianwei Liang,Xin Zhou,Chen Wei,Hanjin Luo
Contamination of drinking water with heavy metals, particularly arsenic (As), is a persistent problem with serious public health implications worldwide. In this study, we present a zinc based metal-organic framework (Zn-MOF-74) and polyacrylamide polymer (PAM) coated on reduced graphene oxide (rGO) as an effective adsorbent for the removal of arsenite (As(III)) from water. Zn-MOF-74 nanoparticles were prepared by room-temperature precipitation and these were immobilized on rGO surface grafted PAM by a free-radical polymerization method, (Zn-MOF-74/rGO/PAM nanocomposites). The experimental data correlates well with the pseudo-second-order kinetic model and Langmuir isotherm, and the maximum adsorption capacity ( q max ) was 282.4 mg g −1 at pH 10, 298 K. The removal efficiency was rapid, removing more than 99.8% of As(III) from a 0.2 mg L −1 solution and achieving drinkable levels in 15 min. Thermodynamic data revealed that the process was spontaneous and endothermic. Furthermore, the adsorbent revealed high stability in pH range 4–10 and could be reused at least four times. Adsorption mechanism involved a synergistic combination of chemisorption and physisorption. FTIR and XPS analyzes revealed that the amide group (–NH 2 ) and hydroxyl group (–OH) on Zn-MOF-74/rGO/PAM dominate in their adsorption.
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高影响因子
APPLIED SURFACE SCIENCE
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2021
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IF 6.707
Dashi Lei,Juanqin Xue,Xiangyu Peng,Shuhao Li,Qiang Bi,Changbin Tang,Liang Zhang,Jing Zhang
Inorganic arsenic threatens human health due to its high mobility and toxicity. In this work, rapid and effective treatment of As(III) wastewater was achieved by Z-Scheme photocatalyst (ZnFe 2 O 4 /Ag/AgCl). By means of peroxymonosulfate (PMS) activation, 50 mg/L As(III) was completely removed within 20 min under light irradiation. During photocatalytic system, free radicals ( SO 4 − , OH, O 2 − ) and non-radicals ( 1 O 2 ) were responsible for As(III) removal. The fast PMS activation was attributed to the loop conversion of Fe(III)/Fe(II) and Ag 0 /Ag + . Besides, density functional theory (DFT) calculations exhibited that Fe atoms were active sites for As(III) adsorption and Ag nanoparticles were spots for PMS activation. Specially, the dual active sites on photocatalyst could effectively minimize the distance between oxidizing product with arsenite molecular and thus facilitate As(III) fast oxidation.
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ENVIRONMENTAL RESEARCH
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2019
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IF 5.026
Ying Li,Yijie Han,Wei Li,Yuxin Li,Deyun Zhang,Yeqing Lan
A novel magnetic sulfur-doped Fe–Cu–Y trimetal oxide (MST) nanomaterial was successfully synthesized by a chemical coprecipitation method to remove As(III) via simultaneous oxidation and adsorption and then characterized by BET, VSM, FESEM, XPS, and FTIR techniques. The effect of solution initial pH on the adsorption of As(III), and the adsorption kinetics and isotherm were investigated in detail. The results indicated that the MST nanoparticles exhibited an excellent performance for As(III) removal in a pH range of 7–10 and were easily separated from aqueous solution with a magnet. The maximum removal capability for As(III) reached 202.0 mg/g at pH 7.0. The adsorption of As(III) was well fitted by the pseudo-second-order kinetic model and Langmuir isotherm model, respectively. The investigation of mechanism revealed that As(III) could be oxidized to As(V) by O 2 − and OH free radicals, generated via the dissolved O 2 obtaining an electron from Cu(I) on the surface of the adsorbent and Fenton/Fenton-like reaction, respectively. Meanwhile, the produced As(V) was adsorbed onto the surface of the nanoparticles through the electrostatic attraction or diffusion. The adsorbed As(V) further interacted with –OH groups via ion exchange or with Y(III) on the surface of the adsorbent to form a precipitate. Therefore, the MST nanoparticles are promising for the removal of arsenic from water.
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高影响因子
WATER RESEARCH
·
2024
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IF 11.4
Fangyuan Meng,Hui Tong,Chunhua Feng,Ziyuan Huang,Pan Wu,Jimei Zhou,Jian Hua,Fei Wu,Chengshuai Liu
Magnetite is a reductive Fe(II)-bearing mineral, and its reduction property is considered important for degradation of contaminants in groundwater and anaerobic subsurface environments. However, the redox condition of subsurface environments frequently changes from anaerobic to aerobic owing to natural and anthropogenic disturbances, generating reactive oxygen species (ROS) from the interaction between Fe(II)-bearing minerals and O 2 . Despite this, the mechanism of ROS generation induced by magnetite under aerobic conditions is poorly understood, which may play a crucial role in As(III) oxidation. Herein, we found that magnetite could activate O 2 and induce the oxidative transformation of As(III) under aerobic conditions. As(III) oxidation was attributed to the ROS generated via structural Fe(II) within the magnetite octahedra oxygenation. The electron paramagnetic resonance and quenching tests confirmed that O 2 •− , H 2 O 2 , and •OH were produced by magnetite. Moreover, density function theory calculations combined with experiments demonstrated that O 2 •− was initially formed via single electron transfer from the structural Fe(II) to the adsorbed O 2 ; O 2 •− was then converted to •OH and H 2 O 2 via a series of free radical reactions. Among them, O 2 •− and H 2 O 2 were the primary ROS responsible for As(III) oxidation, accounting for approximately 52 % and 19 % of As(III) oxidation. Notably, As(III) oxidation mainly occurred on the magnetite surface, and As was immobilized further within the magnetite structure. This study provides solid evidence regarding the role of magnetite in determining the fate and transformation of As in redox-fluctuating subsurface environments.
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高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
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2025
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IF 11.3
Zhaoli Liu,Jiahui Fu,Qianfen Xiao,Wei-Xian Zhang,Airong Liu
The reactivity of nanoscale zerovalent iron (nZVI) in practical application is influenced by ubiquitous humic acid (HA), with its structural evolution and synchronous hydroxyl radical (•OH) generation behaving as closely interrelated processes that govern contaminant fate under dynamic redox conditions. In this study, the influence of different HA concentrations on the structural evolution of nZVI, synchronous •OH generation, and arsenite [As(III)] sequestration was investigated. While HA did not alter the types of evolutionary products, it accelerated zerovalent iron (Fe0) corrosion. Extended X-ray absorption fine structure and density functional theory calculation revealed that adsorbed-HA extended the Fe–O bonds in the nZVI surface, causing the compact passivation layer to rupture and the inner Fe0 to expose. This structural destabilization, along with reduced nZVI aggregation induced by HA, promoted the continuous corrosion of Fe0. Furthermore, quantitative analysis by high performance liquid chromatography demonstrated that HA enhanced •OH production in the nZVI system by up to 7-fold, due to the increased Fe(II)/Fe(II)–HA concentrations in solution. In addition, rapid Fe0 corrosion facilitated more •OH-mediated oxidation of As(III) to arsenate [As(V)] at pH 6.0, whereas at pH 9.0, it resulted in faster As(III) sequestration by generating new adsorption sites and enhancing As–Fe coprecipitation. These findings provide valuable insights into the roles of HA in modulating nZVI performance in environmental applications and As(III) fate.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Yanhua Xie,Mingyue Hu,Jiahao He,Haiyan Hu,Tianliang Zheng,Silu Lv,Shengyan Pu
Alkaline As(III)-contaminated wastewater, which is prevalent at tunnel-construction sites, poses a serious risk to the environment and human health. However, the existing research on the treatment of this alkaline wastewater is scarce. Herein, we proposed a treatment method based on a Fe(II)/CaSO 3 system enhanced by highly alkaline As(III)-contaminated wastewater (pH: ~12) itself. Mechanistic investigations revealed that alkaline conditions enhanced the process in two ways: (i) by accelerating the Fe(II)/Fe(III) cycle to sustain · OH and SO 4 · − radical generation and (ii) by promoting the reaction between M(Ca/Fe)–OH and the oxidation products of AsO 4 3− species. These dual effects promoted the formation of Ca 5 (AsO 4 ) 3 OH and FeAsO 4 precipitates that immobilized As(V). Furthermore, the Fe(II)/CaSO 3 system exhibited high resistance against interference from suspended solids and other coexisting substances. The system achieved >98 % removal of 30 mg·L −1 As(III) within 10 min at pH ~12. Notably, the final effluent pH value could be reduced to an ecofriendly value of ~8, and the residual SO 4 2− concentration was lower (140 mg·L −1 ) than that observed in common sulfur-based systems (e.g., peroxomonosulfate, peroxydisulfate, and sodium sulfite). This study presents a perspective shift in treating alkaline wastewater streams by viewing a dominant waste characteristic as a resource rather than as a barrier. Moreover, it provides an effective method for As(III) decontamination of alkaline wastewater.
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高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2020
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IF 6.551
Yifan Huang,Minling Gao,Yingxuan Deng,Zulqarnain Haider Khan,Xuewei Liu,Zhengguo Song,Weiwen Qiu
The by-product of the traditional Fenton reaction , colloidal arsenic-‑iron oxide, is migratable and may cause secondary environmental pollution . This paper reported a new strategy involving oxidizing and immobilizing inorganic arsenic using the Fenton reaction, and avoiding the risk of secondary contamination. Lab synthesized ferrihydrite-loaded biochar (FhBC) was developed for oxidizing and binding As(III) and As(V) in aqueous solution. Batch experiments and a series of spectrum analysis (e.g., X-ray photoelectron spectroscopy [XPS], electron paramagnetic resonance [EPR], and Fourier transform infrared spectroscopy [FTIR]) were conducted to study the oxidizing or adsorption capacity and mechanism. The maximum adsorption capacity of FhBC for As(III) and As(V) is 1.315 and 1.325 mmol/g, respectively. In addition, FhBC has an efficient oxidizing capacity within a wide pH range, which is because biochar promotes the Fenton reaction by acting as an electron donator, electron shuttler, or by providing persistent free radicals. Moreover, the adsorption mechanism was studied by FTIR spectroscopy, XPS, and X-ray diffraction (XRD). The formation of internal spherical complexes and iron oxides with a higher degree of crystallization was observed, which indicate that the products of adsorption are stable and robust in a complex environment and can exist in a highly crystallized form after adsorbing arsenic ions. Therefore, the use of FhBC as an adsorbent for arsenic represents a new strategy of using the Fenton reaction while reducing secondary contamination. These results may contribute to further mechanistic studies or extensive practical applications of FhBC.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 17
·17373-17382
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IF 2.914
Liu Xuewei,Gao Minling,Qiu Weiwen,Khan Zulqarnain Haider,Liu Nengbin,Lin Lina,Song Zhengguo
In this study, a novel Fe–Mn–Ce oxide-modified biochar composite (FMCBC) was synthesized via pyrolysis to enhance the adsorption capacity of biochar (BC). Scanning electron microscopy-energy-dispersive X-ray spectroscopy confirmed that Fe, Mn, and Ce were successfully loaded onto the surface of the BC. A series of adsorption experiments showed that the FMCBC exhibited improved adsorption of As(III) in an aqueous environment. The adsorption process was well expressed by the pseudo-second-order kinetic model. The adsorption capacity of FMCBC reached 8.74 mg L −1 , which was 3.27 times greater than that of BC. The pH of the solution significantly influenced the adsorption of As(III), where the amount of As(III) adsorbed by FMCBC was maximized at pH 3. A high phosphate concentration inhibited adsorption, whereas nitrate and sulfate ions promoted As(III) adsorption and increased the FMCBC adsorption capacity. Similarly, with increasing humic acid concentration, the adsorption capacity of FMCBC for As(III) decreased; however, a low concentration of humic acid promoted adsorption. X-ray photoelectron spectroscopy analysis revealed that the adsorption of As(III) by FMCBC occurred through redox and surface complexation reactions. Therefore, FMCBC has excellent potential for purifying arsenic-contaminated water.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
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IF 15.1
Siqi Hou,Wei Ding,Shuang Liu,Huaili Zheng,Jun Zhai,Liuwei Yang,Zheng Zhong
Elimination of As(III) from water has gotten more attention in comparison with As(V) due to its higher mobility and toxicity. In this work, we provide an effective method by integrating a cobalt-based metal–organic framework ZIF-67 and sulfite (S(IV)) to purify As(III)-laden water. The coupled oxidation with adsorption process (i.e., As(III) removal by ZIF-67/S(IV)) surpasses a divided preoxidation-adsorption process (i.e., As(V) removal by ZIF-67) for arsenic removal from the multi-component water containing various coexisting anions. Herein, the mechanism investigation corroborated that the S(IV) plays dual roles as a complexing ligand and a precursor of oxysulfur radicals. The enhanced As(III) removal is attributed to the S(IV) activation on the ZIF-67 surface via various reactions (e.g., surface complexation and intramolecular electron transfer), which not only generates SO 4 − radicals for rapid oxidation of As(III) to As(V), but also provides more adsorption sites for the immobilization of the oxidized product (As(V)). Furthermore, the combined process can rapidly treat arsenic in the realistic contaminated water from 242 to 7 μg L −1 within 15 min, directly meeting the provisional maximum contaminant level (<10 μg L −1 ). Overall, the proposed work may aid the rational design of S(IV) mediated oxidation-adsorption process to remove arsenic from a variety of contaminated waters.
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高影响因子
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