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首页> 外文期刊>Environmental research >Composite of chitosan and bentonite cladding Fe-Al bimetal: Effective removal of nitrate and by-products from wastewater
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Composite of chitosan and bentonite cladding Fe-Al bimetal: Effective removal of nitrate and by-products from wastewater

机译：壳聚糖和膨润土夹层Fe-Al双金属的复合材料：有效除去废水中的硝酸盐和副产品

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摘要

Chitosan was used as crosslinking agent to load bimetal particles onto bentonite. The Fe-Al bimetal chitosan bentonite (Fe-Al bimetal @ bent) complex was prepared for the efficient removal of nitrate from wastewater and its by-products at low temperature. The samples were characterized by Scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR), X-Ray Diffraction (XRD), Zeta potential, X-ray photoelectron spectroscopy (XPS) and Brunauer-Emmett-Teller (BET) surface area and Energy Dispersive X-ray Detector (EDX). SEM and EDX showed that Fe~0 was deposited on the surface of aluminum, the Fe-Al bimetal were surrounded by chitosan and bentonite. XRD showed that Al can effectively protect the reactivity of Fe. The experimental results of nitrate removal showed that pH was the main factor affecting on nitrate removal rate and performance. The removal efficiency of nitrate wastewater with a concentration of 50 mg/L was approximately 90% in 60min. Fe-Al bimetal @ bent has better nitrate removal performance and faster reduction rate at low temperature(2-7 °C) than normal temperature (25 °C). The reason was that chitosan, bentonite and bimetal have excellent synergistic effect. It can effectively improve the reaction rate, pH buffering capacity, reduce secondary pollution and total nitrogen (TN). Fe-Al bimetal @ bent has better N_2 selectivity than Fe-Al bimetal.
机译：壳聚糖用作交联剂，以将双金属颗粒称为膨润土。制备Fe-Al双金属壳聚糖膨润土（Fe-Al双金属@弯曲）复合物，以便在低温下有效地从废水中除去硝酸盐及其副产物。通过扫描电子显微镜（SEM），傅立叶变换红外光谱（FTIR），X射线衍射（XRD），Zeta电位，X射线光电子谱（XPS）和Brunauer-Emmett-extreser（BET）表面积来表征样品。和能量分散X射线探测器（EDX）。 SEM和EDX显示，Fe〜0沉积在铝的表面上，Fe-Al双金属被壳聚糖和膨润土包围。 XRD表明，AL可以有效地保护Fe的反应性。硝酸盐去除的实验结果表明，pH是影响硝酸盐去除率和性能的主要因素。浓度为50mg / L浓度的硝酸盐废水的去除效率约为60mIn约90％。 Fe-Al Bimetal @弯曲在低温（2-7°C）中具有更好的硝酸盐去除性能和比常温（25°C）更快的缩减率。原因是壳聚糖，膨润土和双金属具有出色的协同效应。它可以有效提高反应速率，pH缓冲能力，减少二次污染和总氮（TN）。 Fe-Al Bimetal @ Bent具有比Fe-Al双金属更好的N_2选择性。

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  • 来源
    《Environmental research》 |2020年第5期|109336.1-109336.10|共10页
  • 作者

    Houming Cheng; Qi Zhu; Aiwen Wang; Mingmei Weng; Zipeng Xing;

  • 作者单位

    School of Chemistry and Materials Science Heilongjiang University Key Laboratory of Chemical Engineering Process & Technology for High-efficiency Conversion Harbin 150080 China;

    School of Chemistry and Materials Science Heilongjiang University Key Laboratory of Chemical Engineering Process & Technology for High-efficiency Conversion Harbin 150080 China;

    School of Chemistry and Materials Science Heilongjiang University Key Laboratory of Chemical Engineering Process & Technology for High-efficiency Conversion Harbin 150080 China;

    School of Chemistry and Materials Science Heilongjiang University Key Laboratory of Chemical Engineering Process & Technology for High-efficiency Conversion Harbin 150080 China;

    School of Chemistry and Materials Science Heilongjiang University Key Laboratory of Chemical Engineering Process & Technology for High-efficiency Conversion Harbin 150080 China;

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  • 正文语种 eng
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  • 关键词

    Bimetal; Nitrate; Adsorption; Synergistic effect; Low temperature; Secondary pollution;

    机译：双金属;硝酸盐;吸附;协同效应;低温;二次污染;

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