JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2024
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IF 2.8
Bo Yu,Xiaoning Li,Jiao Ma,Han Yan,Ke Lian,Pengfei Shen
BACKGROUND Arsenic contamination can exert severe detrimental effects on the ecological environment and human health. It can cause acute or chronic poisoning, resulting in cell distortion or cancer when humans come into contact with or consume arsenic-containing water. Adsorption technology is one of the effective methods for arsenic removal. In this study, using attapulgite (ATP) as a support for bimetallic iron–manganese oxides, a series of adsorbents (Fe-Mn/ATP) with different manganese-to-iron molar ratios were prepared via the coprecipitation method. Scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy mapping, X-ray diffraction and zeta potential measurements were used to analyze the structure and properties of Fe-Mn/ATP. In addition, the adsorption performance of the material for arsenic ions was investigated by static adsorption and dynamic adsorption experiments. RESULTS A novel Fe-Mn/ATP adsorbent was prepared using ATP as the raw material and manganese-to-iron molar ratio was 1:3 by coprecipitation at 60 °C for 1 h. The adsorption efficiency of arsenic ions was optimal at an Fe-Mn/ATP dosage of 2 g L −1 , pH 4 and a contact time of 10 min, reaching a maximum adsorption capacity of 38.27 mg g −1 at room temperature. The adsorption process followed the pseudo-second-order kinetic model and the Langmuir isotherm adsorption model, indicating that arsenic ion adsorption by Fe-Mn/ATP was mainly monolayer chemical adsorption. Furthermore, Fe-Mn/ATP showed a removal rate for arsenic ions of over 80% after four cycles of regeneration, revealing a great potential for practical application. CONCLUSION This study offers a promising Fe-Mn/ATP adsorbent for removal of arsenic ions from wastewater. © 2024 Society of Chemical Industry (SCI).
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
SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Chen Wang,Zewei Hu,Wei Lou,Mingjie Huang,Wei Xiang,Tao Zhou,Juan Mao,Xiaohui Wu
This study has demonstrated that the Fenton fluidized bed (FFB) technology could successfully immobilize As ions on the iron-crystallized (IC) carriers, with simultaneous crystallization of ferric and mineralization of organic pollutants. It was found that rapid fluidized immobilization of aqueous As(V) on the IC carriers was through surface favorable bidentate complexion, while the adsorptive removal of As(III) was rather slow. Adding Fe 3+ caused competitive complexion and inhibited the As(V) immobilization. However, effective oxidative crystallization of Fe(II) and As(III) in FFB would take place. With the simultaneous generation of As(V) and Fe(III) by rapid •OH oxidation, two different crystalline precursors would be formed on the IC carriers, leading to efficient co-crystallization of As(V)/Fe(III). Recursive Fe(III) crystallization in the FFB continuously provided essential surface hydroxyl groups for capturing As(V), inducing layer-by-layer co-crystallized immobilization As(V)/Fe(III). The long-term continuous-flow treatment of a practical As(III)-containing industrial organic wastewater exhibited effective/stable co-crystallizations of As(V)/Fe(III), as well as COD removal. The FFB technology is expected to be a good option in treating complex industrial wastewater containing heavy metal and recalcitrant organic pollutants.
研究领域:
环境科学
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化学工程
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废水处理
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DOI
高影响因子
MINERALS ENGINEERING
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2024
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IF 4.9
Jiayu Xin,Jiahong Li,Xi Zhao,Changliu He,Lei Zheng,Aijun Zhang,Ranting Tao,Xu Zhang
Improving the efficiency of leaching arsenic from arsenic-containing gold ores is still a problem that needs to be solved urgently by traditional biological oxidation method. In this work, the effect of oxidant on mineral leaching and the change of arsenic ion valence during biological oxidation were investigated in detail. The results showed that when 5 g/L Peroxymonosulfate(PMS) was added on the second day of bioleaching, the concentration of arsenic ion in the solution was 0.682 g/L on the 14th day of the reaction, and the leaching rate of arsenic reached 71.06 %. Compared with the mixed microbial leaching system, the leaching rate of arsenic was increased by 8.95 %, while the content of As (Ⅲ) was decreased by 12.82 %. The results of electrochemical experiments show that PMS plays a cathode strengthening role in mineral oxidation and the passivation phenomenon in the process of microbial leaching is reduced by improving the oxidation capacity of the system. And the dissolved charge transfer resistance of the mineral is reduced from 44.17 Ω to 32.29 Ω. This study provides a new research perspective for improving the arsenic leaching rate of arsenic-containing gold ores, and our strategy also provides guidance for the research mechanism of increasing the arsenic leaching rate.
研究领域:
微生物学
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环境科学
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矿物加工工程
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DOI
高影响因子
Analytical Methods
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2018
·Vol. 10
·期 46
·5486-5492
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IF 2.073
Yunsuo Kuang,Linfeng Chen,Xike Tian,Yong Li,Liqiang Lu,Chao Yang,Zhaoxin Zhou,Yulun Nie
In this study, three novel fluorophores with aggregation-induced emission effects (AIE) have been synthesized by a new strategy that uses the non-AIE active compound 3,5-dibromobenzaldehyde (DBB) as a core (stator). This new strategy is completely different from the traditional synthetic process of AIE compounds that rely heavily on the modification of the classic existing AIE core such as archetypal silole, tetraphenylethene and distyrylanthracene. The obtained DBB derivatives (S1, S2 and S3) display typical AIE characteristics in which their quantum yields in the solid state are much higher than that in the solution. In addition, the emission can be fine-tuned by varying the rotor on the DBB skeleton, and a significant Stokes shift from 395 nm to 434 nm can be observed with the increase of the conjugate structure from S1 to S3. Furthermore, S1, S2 and S3 showed an exclusively selective turn-on response to As3+, and the detection limits are lower than the guideline of As3+ in drinking water, permitted by the EPA. This study will be instructive in providing a strategy for the synthesis of AIE luminogens, which not only greatly enrich the species of AIE compounds, but also broaden their application.
研究领域:
化学
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材料科学
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环境科学
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DOI
高影响因子
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