Synthesis of mesoporous silica materials from municipal solid waste incinerator bottom ash
Synthesis of mesoporous silica materials from municipal solid waste incinerator bottom ash
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DOI：
10.1016/j.wasman.2014.02.016
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发表时间：
2014-05-01
期刊：
影响因子：
8.1
通讯作者：
Huang, Chun-Yi
中科院分区：
文献类型：
--
作者：
Liu, Zhen-Shu;Li, Wen-Kai;Huang, Chun-Yi
焚烧炉底灰含有大量的二氧化硅，因此可以用作合成介孔二氧化硅材料的硅源。研究了碱熔法从焚烧炉底灰中提取二氧化硅的条件，并将所得上清液作为合成介孔二氧化硅材料的硅源。采用BET、XRD、FTIR、SEM、固体核磁共振等手段对介孔氧化硅材料的理化性质进行了表征。结果表明，合成的SiO2材料的BET比表面积为992 m2/g，孔径分布为2 ~ 3.8 nm。XRD分析表明，合成的材料具有有序度较小的六方孔结构。合成材料的NMR谱显示出三个峰，对应于Q（2）[Si（OSi）（2）（OH）（2）]、Q（3）[Si（OSi）（3）（OH）]和Q（4）[Si（OSi）（4）]。FTIR光谱证实了表面羟基的存在和对称Si-O伸缩的发生。因此，以焚烧炉底灰为原料成功合成了介孔二氧化硅。最后，还确定了合成的二氧化硅在从水溶液中去除重金属（Pb 2+、Cu 2+、Cd 2+和Cr 2+）方面的有效性。结果表明，由焚烧炉底灰合成的二氧化硅材料具有作为吸附剂去除水溶液中重金属的潜力。(C)2014爱思唯尔有限公司版权所有。
Incinerator bottom ash contains a large amount of silica and can hence be used as a silica source for the synthesis of mesoporous silica materials. In this study, the conditions for alkaline fusion to extract silica from incinerator bottom ash were investigated, and the resulting supernatant solution was used as the silica source for synthesizing mesoporous silica materials. The physical and chemical characteristics of the mesoporous silica materials were analyzed using BET, XRD, FTIR, SEM, and solid-state NMR. The results indicated that the BET surface area and pore size distribution of the synthesized silica materials were 992 m(2)/g and 2-3.8 nm, respectively. The XRD patterns showed that the synthesized materials exhibited a hexagonal pore structure with a smaller order. The NMR spectra of the synthesized materials exhibited three peaks, corresponding to Q(2) [Si(OSi)(2)(OH)(2)], Q(3) [Si(OSi)(3)(OH)], and Q(4) [Si(OSi)(4)]. The FTIR spectra confirmed the existence of a surface hydroxyl group and the occurrence of symmetric Si-O stretching. Thus, mesoporous silica was successfully synthesized from incinerator bottom ash. Finally, the effectiveness of the synthesized silica in removing heavy metals (Pb2+, Cu2+, Cd2+, and Cr2+) from aqueous solutions was also determined. The results showed that the silica materials synthesized from incinerator bottom ash have potential for use as an adsorbent for the removal of heavy metals from aqueous solutions. (C) 2014 Elsevier Ltd. All rights reserved.