BIORESOURCE TECHNOLOGY
·
2023
·
IF 11.4
Jingyi Gao,Mengdi Zhao,Zibo Xu,Kang Liu,Hua Zhong,Daniel C.W. Tsang
Ca-biochar is an efficient material for As(III)-containing acid mine drainage (AMD) decontamination, while it is challenging to fabricate Ca-biochar with oyster shell waste as the Ca source due to its complex structure. Herein, a mechanochemical method was proposed to activate oyster shell waste and wood waste for Ca-biochar design and production, and its efficacy and relevant mechanisms for AMD detoxification were evaluated. The smaller size Ca-biochar produced by the medium-speed ball milling showed a higher As(III) removal (74.0 %) compared to high-speed ball milling (60.9 %), attributed to the formation of finer Ca(OH) 2 while avoiding particle aggregation, which could release more Ca (89.0 mg/g) and alkalinity for the co-precipitation of As. Meanwhile, wood-based biochar substrate served as a platform for co-precipitation, and its surface functionality supported the oxidative immobilization of As. This study presents a promising route for upcycling food and wood waste to produce Ca-biochar for AMD decontamination.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL POLLUTION
·
2024
·
IF 7.6
Tao Huang,Yu-Xuan Feng,Lulu Zhou,Shu-wen Zhang
The self-cementation characteristics of arsenic (As)-contaminated soil were comprehensively investigated in this study. Different non-thermal plasma-irradiated binary (hydro)oxides of polyvalent ferromanganese (poly-Fe-Mn) were synthesized and exploratorily dispersed to soil samples to activate solidification and stabilization during the self-cemented process. The maximum compressive strength of 56.35 MPa and the lowest leaching toxicity of 0.004 mg/L were obtained in the proof test under optimal conditions ( i . e ., the mass ratio of the poly-Fe-Mn to the soil sample of 0.05; the mass ratio of the composite alkali activator (NaOH + CaO) to the soil sample of 0.25; the mass ratio of CaO to NaOH of 1.5; the mass ratio of the DI water to the binder of 0.515). The composite alkaline activator primarily contributed to the strength formation of the self-cemented matrix while the poly-Fe-Mn significantly influenced the reduction of the As-leaching toxicities. The poly-Fe-Mn maintained diffusion-controlled polycondensation and strengthened the nucleation process during self-cementation. The amount of water and the dosage of poly-Fe-Mn caused an interactive influence on the self-cemented solidification of contaminated soils. The solidified samples with poly-Fe-Mn exhibited better thermal decomposition than their counterparts, reflecting the enhancement of poly-Fe-Mn to the matrix. Some minerals including C-S-H, kaolinite, gehlenite, diopside sodian, augite, and albite were matched in the samples, directly demonstrating the geopolymerization-steered self-cementation of the As soil. The employment of poly-Fe-Mn not only reinforced the immobilization of As pollutants in the matrix but also induced the self-cementation of soils by intensifying the composite alkaline-activated geopolymerization kinetics.
研究领域:
环境科学
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土壤修复
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材料科学
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产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 23
·64233-64245
·
IF 5.8
Jin Qi,Dong Yingbo,Pan Hanlin,Lin Hai
It is challenging to separate the materials for treating arsenic contamination of soil and water from systems. The natural magnetite covered with Fe–Mn bimetallic (oxyhydr)oxide (Fe–Mn MSM) was effectively created in this study, and its potential use in removing As from water and soil was investigated. Batch adsorption studies showed that the As(V) adsorption on Fe–Mn MSM could achieve equilibrium after 120 min when the initial As(V) concentration was 39.85 mg/L. The calculated maximum adsorption of Fe–Mn MSM for As(V) was 17.94 mg/g at 20 °C. The mechanism of As(V) adsorption was confirmed to be a combination of ligand exchange and electrostatic attraction by the outcomes of FTIR analysis, SEM, and batch adsorption tests. Fe–Mn MSM can also be a successful amendment for cleaning up As-polluted soil. The 5% Fe–Mn MSM treatment group had the lowest exchangeable fraction of As (EX-As) concentration, 0.039 mg/kg (8.3% of initial EX-As), after 40 days. Magnetic separation could be used to quickly and completely recover the used Fe–Mn MSM from the soil. EX-As was present in higher concentrations on Fe–Mn MSM than that of the original soil. As a result, this work offers a strategy that may be put into practice to cheaply remove As from soil and water while also encouraging the reuse of natural magnetite. Graphical abstract
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2024
·
IF 8.1
Xinrou Yi,Hui Zhao,Yuanfeng Wei,Yuxin Li,Ting wang,Zhaoshuang Li,Chuntao Kuang,Kai Yin,Chengbin Liu
Arsenic-contaminated groundwater is an intractable environmental problem worldwide, particularly As(III), which is not only highly toxic but also resistant to removal. In this study, sustainable chloramine-functionalized iron hydroxide cellulose nanofibrous membrane (Fe-CNFM-Cl) was prepared by electrostatic spinning followed by chemical grafting for As(III) decontamination. In situ engineered iron hydroxides were uniformly dispersed in cellulose nanofibers for As adsorption. The oxidative chlorine (+1) in the grafted chloramine could oxidize As(III) to readily removable As(V). Benefiting from oxidation-enhanced adsorption, Fe-CNFM-Cl was able to remove As(III) reliably. Using Fe-CNFM-Cl, As(III) levels were purified from 1418.73 μg L −1 to meet drinking water standards within 300 min. Additionally, Fe-CNFM-Cl exhibited high iron utilization with a normalized As adsorption capacity of 214.55 ± 15.52 mg g-iron −1 . Fe-CNFM-Cl performed effectively over a broad pH range of 3–9. Common anions and humic acid hardly inhibit As(III) removal except at high concentrations of phosphate. During the removal of As(III), a portion of As(III) was oxidized to As(V) by activated chlorine. The adsorption and oxidation capacity of the used Fe-CNFM-Cl could be well recovered by desorption with NaOH solution followed by chlorination with NaClO solution. In addition, it could reliably purify the As(III) levels in natural groundwater to below 10 μg L −1 . The study contributes a novel strategy for the development of multifunctional iron-based cellulose biocomposite sorbents for the effective removal of As(III) from water.
研究领域:
环境科学
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材料科学
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水处理技术
✓ 已验证
产品关联
DOI
PubMed
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
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL RESEARCH
·
2023
·
IF 8.3
Yujie Li,Jia Wang,Chao Liu,Long Wang,Peng Zhang,Qianyu Zhao,Zhu Xiong,Gaosheng Zhang,Wei Zhang
Schwertmannite (SCH) is a promising material for adsorbing inorganic arsenic (As). We synthesized SCH nanoparticles (nano-SCH) via a modified chemical oxidation method and investigated the application of nano-SCH for the remediation of As-contaminated soils. The production of nano-SCH was successfully prepared using the persulfate oxidation method with carboxymethyl cellulose stabilization. The spherical structure of the nano-SCH particles had an average hydrodynamic diameter of 296 nm with high specific surface areas (108.9 m 2 /g). Compared with SCH synthesized via the H 2 O 2 oxidation method, the percentage of Fe 3+ precipitation in nano-SCH synthesis increased from 63.2% to 84.1%. The inorganic As adsorption capacity of nano-SCH improved by 2.27 times at solution pH = 6. After remediation of heavily As-contaminated soils by using 5% nano-SCH, the leachability of inorganic As rapidly decreased to 0.01% in 30 d. Correspondingly, the immobilization efficiencies of inorganic As in soil reached >99.9%. The inorganic As fractions in treated soil shifted from specifically and nonspecifically bound forms to amorphous and crystalline hydrous oxide-bound fractions. After treatment with 5% nano-SCH for 60 d, soil pH slightly decreased from 5.47 to 4.94; by contrast, soil organic matter content increased by 20.9%. Simultaneously, dehydrogenase concentration in soil decreased by 22.4%–34.7% during the remediation process. These changes in soil properties and As immobilization jointly decreased microbial activity and initiated the re-establishment of bacterial communities in the soil. In summary, this study presents a novel and high-productivity technology for nano-SCH synthesis and confirms the high As immobilization effectiveness of nano-SCH in the remediation of As-contaminated soils.
研究领域:
环境科学
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土壤学
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2022
·
IF 14.224
Wenlan Ji,Yuanjie Xiong,Yuan Wang,Tian C. Zhang,Shaojun Yuan
Dealing with arsenic pollution has been of great concern owing to inherent toxicity of As(III) to environments and human health. Herein, a novel multilayered SnO 2 /PPy/ β -PbO 2 structure on TiO 2 nanotube arrays (TNAs/SnO 2 /PPy/ β -PbO 2 ) was synthesized by a multi-step electrodeposition process as an efficient electrocatalyst for As(III) oxidation in aqueous solution. Such TNAs/SnO 2 /PPy/ β -PbO 2 electrode exhibited a higher charge transfer, tolerable stability, and high oxygen evolution potential (OEP). The intriguing structure with a SnO 2 , PPy , and β -PbO 2 active layers provided a larger electrochemical active area for electrocatalytic As(III) oxidation. The as-synthesized TNAs/SnO 2 /PPy/ β -PbO 2 anode achieved drastically enhanced As(Ⅲ) conversion efficiency of 90.72% compared to that of TNAs/ β -PbO 2 at circa 45.4%. The active species involved in the electrocatalytic oxidation process included superoxide radical (•O 2 − ), sulfuric acid root radicals (•SO 4 − ), and hydroxyl radicals (•OH). This work offers a new strategy to construct a high-efficiency electrode to meet the requirements of favorable electrocatalytic oxidation properties, good stability, and high electrocatalytic activity for As(III) transformation to As(V).
研究领域:
环境科学
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材料科学
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电化学
✓ 已验证
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Yanmei Li,Jing Wang,Ziyang Xiang,Junhui Yang,Jinglin Yin,Xin Guo,Wenlei Wang
In this study, a carbonized aerogel (CA) decorated with Mn-FeOOH hybrid nanoparticles was prepared and has been used as a better heterogeneous photo-Fenton catalyst. Mn doping accelerated the regeneration of Fe 2+ and promoted the decomposition of H 2 O 2 while producing many hydroxyl radicals (·OH), which solved the mass transfer problem in the traditional heterogeneous Fenton system. The amount of·OH in the Mn-FeOOH@CA/H 2 O 2 system within 40 min was 2.4 times higher than that in the FeOOH@CA/H 2 O 2 system, which further indicates that·OH was the main active species. High-porosity CA has been designed as an electron transport channel. During photocatalysis , electron transfer occurred between the Mn-FeOOH composite material and CA. The Fe 2+ could be used as reaction sites to promote the activation of H 2 O 2 on the surface of 1-Mn/FeOOH, and achieved 100 % As(III) degradation efficiency within 25 min. The catalyst maintained more than 80 % of its original oxidation capacity after five cycles of experiments, which indicates that it has good durability. This work is expected to provide rational design of heterometallic doped materials with oxygen vacancies to treat arsenic pollution.
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
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
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材料科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Zhengliang Zhao,Jun Zhou,Zhu Shu
Piezo-catalysis is an emerging approach for green chemistry and water decontamination, which however is absent in aqueous arsenic remediation. Polymeric carbon nitride (PCN), a new piezoelectric material, was recently up-graded into crystalline carbon nitride, potassium poly(heptazine imide) (K-PHI). But the piezo-catalytic property of K-PHI is still blank in literature. This work first realized the oxidation of As(III) by piezo-catalysis and revealed the advanced piezo-catalytic property of K-PHI in comparison with PCN. A much superior (6.7 times faster) piezo-catalytic oxidation of As(III) was achieved on K-PHI, which benefits from its enhanced piezoelectric response deriving from the extended in-plane conjugation of heptazine units. Apart from the crystallinity of carbon nitride, the solution pH, sonication power and catalyst dosage were also found to be positively correlated with the piezo-catalytic As(III) oxidation. Additionally, h + and ·O 2 − rather than OH· were proved to be the active species. These findings not only supply a novel approach for As(III) pollution regulation in water bodies, but also point out the direction to improve the piezo-catalytic performance of carbon nitride.
研究领域:
环境科学
·
材料科学
·
水处理
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Yiqun Liu,Liuke Cai,Xiaoyu Wang,Zhihao Chen,Wenzhong Yang
To address the arsenic contamination in groundwater, the hydrated iron oxide gel beads (CS-HFO) and iron manganese oxide gel beads (CS-FMO) adsorbents were prepared. The CS-HFO and CS-FMO adsorbents had porous and adsorption-friendly pore structures inside, with the average pore sizes of 3.45 nm and 7.78 nm, respectively. As compared to the CS-HFO adsorbent, the CS-FMO adsorbent had rich adsorption sites and oxidation capacity and displayed better adsorption performance. According to the Langmuir model, the saturation adsorption of As(V) and As(III) for CS-FMO adsorbent was calculated as 26.65 mg/g and 35.96 mg/g, respectively. After 10 cycles of regeneration, the CS-HFO and CS-FMO adsorbents demonstrated excellent sustainable arsenic removal ability, while the adsorption efficiencies of CS-FMO adsorbent for As(V) and As(III) were maintained over 60 % and 95 %, respectively. In addition, the competing pollutants and fixed-bed column experiments confirmed the high selectivity of the CS-HFO and CS-FMO adsorbents, which showed great promise for the future application of arsenic contamination removal from the actual groundwater environment.
研究领域:
环境科学
·
水处理
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Tao Huang,LuLu Zhou,Shuwen Zhang,Yuyang Qin,Zhengfeng Hu
In the face of escalating arsenic pollution and the mounting challenge of municipal solid waste incineration (MSWI) fly ashes, cutting-edge technology has emerged as a game-changer. By harnessing the power of MoS 2 nanosheets, a revolutionary approach to double-self-cementation has been unlocked, addressing the limitations of previous methods. Through heterogeneous adsorption, MoS 2 nanosheets bolstered the stability of the matrix, leading to a remarkable surge in compressive strengths and a substantial reduction in leaching toxicities of heavy metals. The compressive strengths of the cemented cubes increased as the dosage of nanosheets increased from 0.3 % to 2.4 %, with compressive strengths ranging from 24.34 to 34.21 MPa. The leaching toxicities of Zn, Cu, Cr, Cd, Pb, and As from the solidified matrix correspondingly decreased to 0.32, 0.21, 0.04, 0.01, 0.05, and 0.53 mg/L, respectively. The role played by nanosheets in inhibiting the release and transport of chloride species further underscored their pivotal contribution. Moreover, the study delved into the intricate mechanisms underlying the impact caused by nanoscale materials cementation and geopolymerization systems, shedding light on their dual function as solidification intensifiers and chemical stabilizers. The nanosheet-enhanced double-self process can be appropriately fitted by the JMAK model. The linear nuclei growth of gels controlled the solidification and geopolymerization of the precursor materials and the stabilization of HM contaminants. This groundbreaking research not only elucidates the transformative potential of MoS 2 nanosheets but also paves the way for a paradigm shift in the treatment of contaminated soils and waste materials.
研究领域:
环境科学
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材料科学
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化学工程
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废物管理
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土壤科学
✓ 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）