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铝/硅和铁/硅共沉淀物的分子结构及其对亚硒酸盐去除的意义。

Molecular Structures of Al/Si and Fe/Si Coprecipitates and the Implication for Selenite Removal.

作者信息

Chan Ya-Ting, Kuan Wen-Hui, Tzou Yu-Min, Chen Tsan-Yao, Liu Yu-Ting, Wang Ming-Kuang, Teah Heng-Yi

机构信息

Department of Soil and Environmental Sciences, National Chung Hsing University, 250 Kuo Kuang Rd., Taichung 40227, Taiwan, R.O.C.

Department of Safety, Health and Environmental Engineering, Ming-Chi University of Technology, New Taipei City 24301, Taiwan, R.O.C.

出版信息

Sci Rep. 2016 Apr 20;6:24716. doi: 10.1038/srep24716.

DOI:10.1038/srep24716
PMID:27095071
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC4837376/
Abstract

Aluminum and iron oxides have been often used in the coagulation processes during water purification due to their unique surface properties toward anions. In the presence of silica, the coprecipitation of Al/Si or Fe/Si might decrease the efficiency of wastewater purification and reuse. In this study, surface properties and molecular structures of Al/Si and Fe/Si coprecipitates were characterized using spectroscopic techniques. Also, the selenite removal efficiency of Al/Si and Fe/Si coprecipitates in relation to their surface and structural properties was investigated. While dissolved silicate increased with increasing pH from Fe/Si coprecipitates, less than 7% of silicate was discernible from Al/Si samples over the range from acidic to alkaline conditions. Our spectroscopic results showed that the associations between Al and Si were relatively stronger than that between Fe and Si in coprecipitates. In Al/Si coprecipitates, core-shell structures were developed with AlO6/AlO4 domains as the shells and Si frameworks polymerized from the SiO2 as the cores. However, Si framework remained relatively unchanged upon coprecipitation with Fe hydroxides in Fe/Si samples. The Si core with Al shell structure of Al/Si coprecipitates shielded the negative charges from SiO2 and thereby resulted in a higher adsorption capacity of selenite than Fe/Si coprecipitates.

摘要

由于铝和铁的氧化物对阴离子具有独特的表面性质，它们在水净化过程的混凝工艺中经常被使用。在存在二氧化硅的情况下，铝/硅或铁/硅的共沉淀可能会降低废水净化和再利用的效率。在本研究中，使用光谱技术对铝/硅和铁/硅共沉淀物的表面性质和分子结构进行了表征。此外，还研究了铝/硅和铁/硅共沉淀物对亚硒酸盐的去除效率与其表面和结构性质之间的关系。虽然从铁/硅共沉淀物中溶解的硅酸盐随着pH值的升高而增加，但在从酸性到碱性的条件范围内，从铝/硅样品中可分辨出的硅酸盐不到7%。我们的光谱结果表明，在共沉淀物中，铝与硅之间的结合相对比铁与硅之间的结合更强。在铝/硅共沉淀物中，形成了核壳结构，以AlO6/AlO4域为壳，由SiO2聚合而成的硅框架为核。然而，在铁/硅样品中，硅框架在与氢氧化铁共沉淀时保持相对不变。铝/硅共沉淀物的硅核铝壳结构屏蔽了来自SiO2的负电荷，从而导致其对亚硒酸盐的吸附能力高于铁/硅共沉淀物。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a2e4/4837376/45bc3b02a44a/srep24716-f8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a2e4/4837376/55b1e31670df/srep24716-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a2e4/4837376/c28683784936/srep24716-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a2e4/4837376/1bc7ac4d1fe6/srep24716-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a2e4/4837376/70b8a3e0bd10/srep24716-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a2e4/4837376/2a63ad22c98d/srep24716-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a2e4/4837376/2781937efb2f/srep24716-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a2e4/4837376/fc57a85c0ab3/srep24716-f7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a2e4/4837376/45bc3b02a44a/srep24716-f8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a2e4/4837376/55b1e31670df/srep24716-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a2e4/4837376/c28683784936/srep24716-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a2e4/4837376/1bc7ac4d1fe6/srep24716-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a2e4/4837376/70b8a3e0bd10/srep24716-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a2e4/4837376/2a63ad22c98d/srep24716-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a2e4/4837376/2781937efb2f/srep24716-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a2e4/4837376/fc57a85c0ab3/srep24716-f7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a2e4/4837376/45bc3b02a44a/srep24716-f8.jpg

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