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负载MnO的羧酸阳离子交换剂对水中硫化物的吸附氧化去除

Adsorptive-Oxidative Removal of Sulfides from Water by MnO-Loaded Carboxylic Cation Exchangers.

作者信息

Wilk Łukasz J, Ciechanowska Agnieszka, Kociołek-Balawejder Elżbieta

机构信息

Department of Industrial Chemistry, Wroclaw University of Economics and Business, 118/120 Komandorska St., 53-345 Wroclaw, Poland.

出版信息

Materials (Basel). 2020 Nov 13;13(22):5124. doi: 10.3390/ma13225124.

DOI:10.3390/ma13225124
PMID:33202896
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7696700/
Abstract

Hybrid ion exchangers (HIX) containing manganese(IV) oxide (MnO) based on macroporous and gel-type carboxylic cation exchangers as supporting materials were obtained. The hybrid materials were characterized using scanning electron microscopy with energy dispersive spectrometry (SEM/EDS), Fourier transform infrared spectroscopy (FTIR), X-ray powder diffraction (XRD) and nitrogen adsorption isotherms at 77 K and mercury porosimetry. HIX with introduced MnO (20.0-32.8 wt% Mn) were tested for removal of dissolved sulfides from anoxic aqueous solutions with 100-500 mg S/dm concentrations. The process proceeded effortlessly at pH 10-13 despite unfavorable electrostatic interactions of the reactants. The highest exhibited sorption capacity was 144.3 ± 7.1 mg S/g. Approximately 65% of dissolved sulfides were oxidized to SO ions and repelled from HIX structure. On average, 13% of sulfide removal products were adsorbed by the MnO surface. The impact of MnO load and the ionic form of HIX functional groups on removal of sulfides and resulting products was examined. The mechanism of the process is suggested.

摘要

制备了以大孔和凝胶型羧酸阳离子交换剂为载体材料、含有二氧化锰（MnO）的混合离子交换剂（HIX）。使用带有能量色散光谱的扫描电子显微镜（SEM/EDS）、傅里叶变换红外光谱（FTIR）、X射线粉末衍射（XRD）以及77 K下的氮气吸附等温线和压汞法对这些混合材料进行了表征。对引入MnO（锰含量为20.0 - 32.8 wt%）的HIX进行了测试，以去除浓度为100 - 500 mg S/dm³的缺氧水溶液中的溶解硫化物。尽管反应物之间存在不利的静电相互作用，但该过程在pH值为10 - 13时仍能顺利进行。所表现出的最高吸附容量为144.3 ± 7.1 mg S/g。大约65%的溶解硫化物被氧化为SO离子并从HIX结构中排斥出去。平均而言，13%的硫化物去除产物被MnO表面吸附。研究了MnO负载量和HIX官能团的离子形式对硫化物去除及产物的影响。提出了该过程的机制。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4477/7696700/2cda5be2afc1/materials-13-05124-g009.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4477/7696700/2cda5be2afc1/materials-13-05124-g009.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4477/7696700/2cda5be2afc1/materials-13-05124-g009.jpg

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