SCIENCE OF THE TOTAL ENVIRONMENT
·
2019
·
IF 5.589
Rong Chen,Hui Liu,Peng Zhang,Lei Zhao,Kang Ding,Songhu Yuan
Groundwater table fluctuation during natural and anthropogenic processes can facilitate the interaction between oxygen (O 2 ) from the unsaturated zone and ferrous iron (Fe 2+ ) from the saturated zone. In light of previous findings that Fe(III)-reducing bacteria can be killed by the reactive oxidants produced from Fe 2+ oxidation under static oxic conditions, we hypothesize that Fe(III)-reducing bacteria will be attenuated during groundwater table fluctuations. To test this hypothesis, this study explored the variations of cell numbers of Shewanella oneidensis strain MR-1 (MR-1), a typical strain of Fe(III)-reducing bacteria, together with dissolved oxygen (DO) and Fe 2+ , at different points during controlled groundwater table fluctuations in a sand column. The results showed that, during the rise of the water table, O 2 in the pore air was entrapped by the deoxygenated groundwater, and Fe 2+ in the groundwater was oxidized by the entrapped O 2 . In this process, 1.40–2.42 orders of magnitude of viable MR-1 cells were killed at different points in the column. Further investigation proposed that the death of MR-1 is caused by the production of intracellular reactive oxidants, such as O 2 • − and OH•, from the oxidation of adsorbed/absorbed Fe 2+ instead of by bulk reactive oxidants, such as OH• and Fe(IV), produced from the oxidation of aqueous Fe 2+ . The findings here provide new insights for Fe biogeochemical cycling in the redox-dynamic zone.
研究领域:
环境微生物学
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水文学
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生物地球化学
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DOI
PubMed
高影响因子
Journal of Environmental Sciences
·
2016
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IF 2.208
Xianze Wang,Zhongmou Liu,Chi Wang,Zhian Ying,Wei Fan,Wu Yang
The presence of mutagenic and carcinogenic nitrosamines in water is of great concern. In this study, seven nitrosamines including N-nitrosodimethylamine (NDMA), N-nitrosodiethylamine (NDEA), N-nitrosomethylethylamine (NMEA), N-nitrosopyrrolidine (NPyr), N-nitrosopiperidine (NPip), N-nitrosodi-n-propylamine (NDPA), and N-nitrosodi-n-butyl-amine (NDBA) were investigated in river water and ground water samples collected from 5 representative cities (Jilin, Songyuan, Harbin, Jiamusi and Tongjiang) along the Songhua River. The total concentrations of nitrosamines in ground water were n.d. (not detected) to 60.8 ng/L, NDMA was the most frequently detected nitrosamines in ground water, followed by NDEA and NPip. Relatively high detected frequency and concentrations of NDMA were also observed in river water samples, and the total nitrosamines' concentration at midstream is always higher than that at upstream and downstream. After 24 hr chlorination, concentration of NDMA, NDBA was obviously increased but NDEA was reduced. Furthermore, UV 254 showed a better relationship with NDMA-FP rather than dissolved organic carbon (DOC), NH 4 -N, and TDN.
研究领域:
环境科学
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公共卫生
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DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Jiangmin Song,Guanxing Huang,Dongya Han,Qinxuan Hou,Ruinan Liu
High performance and high permeability of reactive materials are crucial issues for the remedy of arsenic (As)-enriched groundwater by permeable reactive barriers. The remediation strategy integrating adsorption and oxidation has gained wide concerns due to its deep removal for As(Ⅲ). In this study, a granular bifunctional nanocomposite MgO-Chitosan-MnO 2 (MgO-CS-MnO 2 ) was fabricated as permeable reactive media for the in-situ remediation for high As groundwater. The needle structure of MnO 2 could provide adequate oxidation sites, furthermore, the multilayer porous characteristic of MgO-CS could also meet higher adsorption capacity. As a result, the estimated maximal adsorption capacity of MgO-CS-MnO 2 for As(Ⅲ) reached to 266.61 mg/g and 578.05 mg/g for arsenate (As(Ⅴ)), which are much higher than current similar adsorbents. The adsorption behaviors of As(Ⅲ/Ⅴ) follow pseudo-second-order kinetic model and Freundlich isotherm model, suggesting that both As(Ⅲ) and As(Ⅴ) are mainly chemisorbed onto MgO-CS-MnO 2 . It could perform effectively in a broad range of pH values (3−11), moreover, competing oxyanions (CO 3 2- , NO - , and SO 4 2- ), organic matters (humic acid) and ion strength exert no significant influence towards As remediation. XPS results revealed As(Ⅲ) adsorbed onto composite completely transformed to As(Ⅴ), and removal mechanisms involved oxidation and metal-O-As(Ⅲ/Ⅴ) complexation. In addition, it can be easily regenerated and recycled maintaining an excellent adsorption and oxidative ability. Besides, Column experiment demonstrated this composite column could effectively treat 1300 and 1700 bed volume (BV) of synthetic As(Ⅲ/Ⅴ)-contaminated groundwater, respectively. Therefore, MgO-CS-MnO 2 have a great potential applicability towards high As groundwater improvement as permeable reactive media.
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
JOURNAL OF HAZARDOUS MATERIALS
·
2025
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IF 11.3
Shengjie Hu,Rumeng Zhao,Yuchen Tang,Tingjuan Gao
Soil and groundwater contamination by lead and cadmium poses significant environmental and health risks, necessitating the development of rapid and accurate field monitoring techniques, which are currently lacking. Although solid-phase colorimetric microProbing imaging offers a promising solution, fine-tuning the hydrophilic/hydrophobic microenvironment of lead or cadmium molecular sensors within the microProbing material is essential for achieving rapid and accurate detection. Here, we report a method to covalently bond xylenol orange (a lead sensor) or physically adsorb dithizone (a cadmium sensor) onto the hydrophilic or hydrophobic entities of TentaGel resins, enabling uniform sensor loading, selective sequestration, and rapid microProbing of soil and groundwater lead or cadmium. Through microenvironment fine-tuning, the method achieved high sensitivity, with detection limits of 28 ppm and 9.9 ppb for soil and groundwater lead, and 50 ppb and 6.8 ppb for soil and groundwater cadmium, respectively. It accurately detected soil and groundwater lead from an economic development zone in Shenzhou (Hebei Province) and cadmium from a mine in Daye (Hubei Province), China. A portable microProbing device was also custom-designed and fabricated. With this device, the microProbing method shows great promise for field monitoring of other heavy metals in contaminated lands.
研究领域:
环境科学
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分析化学
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DOI
PubMed
高影响因子
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
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2025
·Vol. 122
·期 12
·e2501354122
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IF 9.1
Leiming Lin,Zheng Li,Jun Ren,Ying Meng,Fubo Luan
The co-occurrence of arsenic and uranium in groundwater has been found in many countries, posing a significant challenge to human health. Here, we have demonstrated the efficient simultaneous removal of arsenic and uranyl-carbonate complexes from groundwater using {001}-TiO2. Surprisingly, the presence of U(VI) greatly enhanced the adsorption of As(V) on {001}-TiO2, while As(V) had a negligible impact on U(VI) adsorption. Through in situ ATR-FTIR spectroscopy, we uncovered a mechanism involving the formation of a ternary surface complex [Ti–U(VI)–As(V)] on the surface of {001}-TiO2. This ternary surface complex formed through the substitution of CO32- from uranyl coordination sites. Furthermore, the adsorbed As(V) and U(VI) can be easily recovered using a sodium hydroxide solution, and {001}-TiO2 can be used repeatedly. Our findings offer a promising solution for the simultaneous removal of As(V) and U(VI) from groundwater and provide valuable insights into the mechanisms involved in their removal.
研究领域:
环境科学
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化学
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产品关联
DOI
PubMed
高影响因子
Journal of Water Process Engineering
·
2022
·
IF 7.34
Longwei Yin,Longjie Liu,Shen Lin,Gary Owens,Zuliang Chen
Arsenic (As) is a contaminant of global concern due to its negative impact on environmental systems, where As occurs mainly as two inorganic species, arsenite (As(III)) and arsenate (As(V)). Thus the simultaneously removal of both As(III) and As(V) from groundwater is a challenging issue. In this paper, zero-valent iron nanoparticles ( n ZVI) with high surface-active sites were used to simultaneously remove both As(III) and As(V) species from groundwater with removal efficiencies >99.9% for an initial concentration 100 μg L −1 . Ion chromatography atomic fluorescence (IC-AFS) analysis indicated that during removal As(III) was oxidized to As(V), while X-ray photoelectron spectroscopy (XPS) showed that the As species were adsorbed on to the surface of n ZVI by a complexation reaction. Furthermore, thermodynamic studies of the adsorption process indicated that adsorption was a spontaneous and endothermic chemisorption process. Finally, practical removal of both As species by n ZVI from real groundwaters was demonstrated with removal efficiencies of 99.9 and 70.9% for As(V) and As(III), respectively. The presence of other coexisting ions affected the removal efficiency, with phosphate and carbonate decreasing the removal efficiencies of both As(III) and As(V) due competition with active binding sites on the surface of n ZVI. Overall, this work demonstrated that n ZVI was a promising adsorbent for the practical removal of inorganic As species from complex environmental matrices such as groundwater.
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
Journal of Water Process Engineering
·
2023
·
IF 7
Bing Wang,Yuzhu Zhang,Chunyang Gao,Xianyuan Du,Tongxu Qu
Organic-contaminated groundwater poses a growing threat to environmental sustainability and human health. As a passive plume control technology, permeable reactive barriers (PRBs)have become a popular method for groundwater pollutants degradation due to their cost-effective and sustainable merits. However, active materials adopted in conventional PRBs have the shortcomings of easy deactivation and speedy consumption. As an alternative, slow-release materials can be used as PRBs fillers to treat contaminated groundwater because of their long chemical release time. In this study, novel slow-release persulfate pellets were prepared and tested for their release capabilities and effectiveness in the remediation of groundwater organic pollution. Results show that each pellet's release efficiency and average release rate within 14 days were 87.36 % and 46.80 mg-persulfate/d, respectively, when the mass ratio of sodium persulfate to paraffin was 3/1. Dissolution and diffusion via pores are the main mechanisms of the persulfate delivery from slow-release pellets in water. Moreover, solution pH, ionic species and addition of quartz sand into release pellets play dissimilar effects on the release kinetics. Results from column experiments indicate that the pellets could expand the PS influence range in the barrier and continuously remediate BTEXs-contaminated groundwater (initial concentration of each compound = 50 mg/L) and reach 64.2–85.1 % removal efficiency. The results of electron spin resonance (ESR) spectroscopy show that both SO 4 − and OH contribute to the removal of BTEXs. This study demonstrates the potential feasibility of slow-release persulfate materials for groundwater pollution treatments by PRBs, which inspires for future field applications.
研究领域:
环境科学
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化学工程
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水资源管理
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DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Jianlei Gao,Zixu Zhao,Yixin Yan,Mengyuan Feng,Yu Wang,Jing Wang
ABSTRACT Hexavalent chromium [Cr(VI)] pollution has attracted intense interest in research on heavy metal pollution removal. Here, quartz sand chitosan zero-valent iron (QS-CTS@ZVI) was prepared as a permeable reactive barrier (PRB) medium material by using PRB permeable reaction wall technology and modified CTS-loaded ZVI-coated quartz sand. Characterization analyses were performed with scanning electron microscope, X-ray diffraction, Fourier-transform infrared spectroscopy and thermogravimetry-differential scanning calorimetry. The effects of the reaction time, reaction temperature, initial solution pH, initial Cr(VI) concentration, adsorbent dosage, interfering ions and adsorption cycle on the adsorption of Cr(VI) and total Cr on QS-CTS@ZVI were examined. Then, the adsorption of Cr(VI) by QS-CTS@ZVI was investigated. The results showed that for a ZVI:CTS ratio of 1:1 (m:m), a QS:ZVI ratio of 1:2 (m:m), a pH of 3, t = 5 h, an initial Cr(VI) concentration of 200 mg/L, a QS-CTS@ZVI dosage of 3.5 g/L, and T = 25°C, the efficiencies of Cr(VI) and total Cr removal by QS-CTS@ZVI were 91.6% and 90.9%, respectively. The adsorption efficiency of QS-CTS@ZVI for Cr(VI) was approximately 80% after three reuses. The coexistence of SO 4 2- in water can significantly inhibit the Cr(VI) adsorption and removal process. The process of adsorption of Cr(VI) by QS-CTS@ZVI conformed to the pseudo-second-order kinetic equation and the Langmuir adsorption isotherm model.
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
JOURNAL OF ENVIRONMENTAL ENGINEERING
·
2021
·Vol. 148
·期 1
·04021072
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IF 1.86
Ting Su,Xiaoning Wang,Xinan Chen,Yan Cheng,Zhenkai Wang,Zhangxiong Wu,Winston Duo Wu,Sheng-Peng Sun
The ferric-nitrilotriacetate (Fe3+-NTA)-catalyzed homogenous Fenton-like reaction (i.e., Fe3+-NTA/H2O2) has received increasing interest for environmental applications, but its potential in degrading trichloroethylene (TCE) in groundwater still is not well known. The results of this study showed that Fe3+-NTA/H2O2 was more effective than other Fe3+-chelate/H2O2 processes (e.g., including ethylenediaminetetraacetate, ethylenediamine-N,N′-disuccinate, citrate, malonate, and tartrate) in degrading TCE in groundwater at natural pH (∼8.0). The effects of important parameters including the ratio of NTA∶Fe3+, and the dosages of Fe3+-NTA and H2O2 were investigated. Greater than 98% degradation efficiency of TCE in actual groundwater was obtained after 60 min of reaction time under the given conditions of NTA∶Fe3+=1.5∶1, 0.1 mM Fe3+-NTA, 5 mM H2O2, and pH 8.0. Hydroxyl radical (HO•) was responsible for the degradation of TCE, and the by-products were identified as formic acid and chloride ion (Cl−). Greater than 90% degradation efficiency of TCE in a sand column was achieved under dynamic conditions [0.5 mM Fe3+-NTA (1∶1.5), 4 mM H2O2, and hydraulic retention time of 4 h], resulting in stoichiometric ratios of ΔCl−∶ΔTCE and ΔTCE∶ΔH2O2 of ∼3∶1 and 4%, respectively. Compared with iron mineral (e.g., magnetite)-catalyzed Fenton-like processes, Fe3+-NTA/H2O2 led to much smaller consumption of H2O2 (at least 1 order of magnitude smaller). In addition, the buffering capacity of bicarbonate anions (HCO3−) in groundwater had a positive effect on the degradation of TCE by Fe3+-NTA/H2O2.
研究领域:
环境科学
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化学工程
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DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2023
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IF 7.8
Zibin Pan,Qingqiang Gao,Zuliang Chen
The elimination of arsenic (As) from arsenic-contaminated mine groundwater has become a worldwide problem because it causes environmental degradation and poses serious risks to human health. In this study, biosynthesized Fe/Cu nanoparticles (Fe/Cu NPs) were used for the simultaneous elimination of As(Ⅲ) and As(Ⅴ) from aqueous solution, resulting in their maximum amounts removed at 8.5 and 17.5 mg/g, respectively. SEM, FTIR, and XPS characterizations indicate that the Fe component on the Fe/Cu NPs acted as an adsorption and catalyst, while the Cu component mainly developed into a co-precipitation reaction with the As species, also facilitating the Fe catalytic processed. Meanwhile, adsorption isotherms , kinetics, and DFT calculations reveal that the removal of As(Ⅲ) was primarily physical/chemical adsorption and oxidation , while the elimination of As(Ⅴ) was co-precipitation and chemisorption. The most stable adsorption site, receiving 0.252 and 0.306 electrons from As(Ⅲ) and As(Ⅴ), respectively, was the unsaturated complexes of iron on the Fe/Cu NPs. Finally, the measurements and XPS results of Fe/Cu NPs in the treatment of groundwater show that the reduced capacity to remove As was attributed to a complex reaction system that disrupted the function of the Cu component, including co-precipitation and made the catalytic process possible. This explains there are differences in the reaction processes of biosynthetic Cu/Fe NPs in aqueous solution and groundwater.
研究领域:
环境科学
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纳米技术
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水处理
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产品关联
DOI
高影响因子
CHEMOSPHERE
·
2024
·
IF 8.1
Shizong Wang,Jun Hu,Jianlong Wang
In this study, Fe 0 @Fe 3 O 4 was synthesized and used to remove U(VI) from groundwater. Different experimental conditions and cycling experiments were used to investigate the performance of Fe 0 @Fe 3 O 4 in the U(VI) removal, and the XRD, TEM, XPS and XANES techniques were employed to characterize the Fe 0 @Fe 3 O 4 . The results showed that the U(VI) removal efficiency of Fe 0 @Fe 3 O 4 was 48.5 mg/g that was higher than the sum of removal efficiency of Fe 0 and Fe 3 O 4 . The uranium on the surface of Fe 0 @Fe 3 O 4 mainly existed as U(IV), followed by U(VI) and U(V). The Fe 0 content decreased after reaction, while the Fe 3 O 4 content increased. Based on the results of experiments and characterization, the enhanced removal efficiency of Fe 0 @Fe 3 O 4 was attributed to the synergistic effect of Fe 0 and Fe 3 O 4 in which Fe 3 O 4 accelerated the Fe 0 corrosion that promoted the progressively formation of Fe(II) that promoted the reduction of adsorbed U(VI) to U(IV) and incorporated U(VI) to U(V). The performance of Fe 0 @Fe 3 O 4 at near-neutrality condition was better than at acidic and alkalic conditions. The chloride ions, sulfate ions and nitrate ions showed minor effect on the Fe 0 @Fe 3 O 4 performance, while carbonate ions exhibited significant inhibition. The metal cations showed different effect on the Fe 0 @Fe 3 O 4 performance. The removal efficiency of Fe 0 @Fe 3 O 4 decreased with the number of cycling experiment. Ionizing radiation could regenerate the used Fe 0 @Fe 3 O 4 . This study provides insight into the U(VI) removal by Fe 0 @Fe 3 O 4 in aqueous solution.
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
ACS ES&T Water
·
2024
·
IF 4.8
Meiou Zhang,Bing Yan,Yong Li,Xianjun Xie
The excessive presence of ammonia and ammonium in groundwater poses potential hazards to human health and ecosystems; thus, accurate measurement of the ammonia nitrogen concentration is very important. Herein, a stable and highly luminescent decorated Tb-MOF was prepared by a hydrothermal and substitution reaction. Under the optimized detection conditions, the decorated Tb-MOF can detect ammonia nitrogen with an exceptional fluorescence enhancement in a wide detection range. The detection limit was determined to be 1.5514 × 10–2 μM in the lower concentration range from 0 to 0.0021 M. In addition, the as-prepared nanosensor also exhibited superior detection selectivity and anti-interference with respect to ammonia nitrogen, and the detection mechanism was investigated as the formation of an isoindole complex from dialdehyde with ammonia nitrogen to induce the energy transfer process. Furthermore, its practical ability was studied in groundwater with a decorated Tb-MOF. The detection in actual groundwater samples proves that this material can be used for practical applications. Our research provides a new method for visual, rapid, and in situ detection of ammonia nitrogen in groundwater.
研究领域:
环境科学
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材料科学
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分析化学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）