CIESC Journal ›› 2014, Vol. 65 ›› Issue (8): 3277-3282.DOI: 10.3969/j.issn.0438-1157.2014.08.058

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Extraction and characterization of SiO2 from rice-husk-char

GU Jie1, LIU Bin2, FANG Fang2, MA Zhongqing1, ZHANG Qisheng1, ZHOU Jianbin1   

  1. 1 Bamboo Engineering and Research Center, Nanjing Forestry University, Nanjing 210037, Jiangsu, China;
    2 College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, Jiangsu, China
  • Received:2013-11-25 Revised:2013-12-20 Online:2014-08-05 Published:2014-08-05
  • Supported by:

    supported by the National Forestry Public Welfare Industry Research Project(201304611), the Technology Support Program of Jiangsu Province(2012BAD30BOO) and the National Basic Research Program of China (2010CB732205).

稻壳炭基二氧化硅的提取及表征

顾洁1, 刘斌2, 方放2, 马中青1, 张齐生1, 周建斌1   

  1. 1 南京林业大学竹材工程研究中心, 江苏 南京 210037;
    2 南京林业大学化学工程学院, 江苏 南京 210037
  • 通讯作者: 张齐生
  • 基金资助:

    林业公益性行业科研专项项目(201304611);国家科技支撑计划项目(2012BAD30BOO);国家重点基础研究发展计划项目(2010CB732205);高校优势学科建设工程项目。

Abstract: The objective of this study is to develop a simple and green procedure for preparing SiO2 from rice husk char. The raw material, rice husk char from downdraft fixed bed gasification was used to extract SiO2 by adding K2CO3. To find the influence of extraction and aging conditions on SiO2 yield, the experiments were conducted. The results showed that the optimum conditions were as follows: the impregnation ratio of K2CO3 solution (mass fraction of 20%) to rice husk char was 3.0, the extraction time 3.5 h. The temperature and time of aging was 3℃ and 3 h, respectively. At these conditions, SiO2 yield was 25.89% and purity 97.02% after acid treatment. The structure and property of SiO2 were analyzed using SEM, EDX, and XRD. The results indicated that it could be a practical way for the high efficiency, environmental-friendly and resource utilization of rice husk char.

Key words: rice husk char, K2CO3, extraction, SiO2, recycling

摘要: 以气化副产物稻壳炭为原料,以K2CO3作为提取剂制取SiO2产品,考察了提取工艺和陈化工艺对产品得率的影响。得到最优工艺:K2CO3质量分数为20%,浸渍比为3.0,煮溶时间为3.5 h,陈化温度为3℃,陈化时间为3 h。最优工艺下制备的SiO2得率为25.89%,酸处理后纯度为97.02%。采用场发射扫描电子显微镜(SEM)、X射线能谱仪(EDX)、X射线衍射仪(XRD)等对产品的性能进行了表征。

关键词: 稻壳炭, 碳酸钾, 提取, 二氧化硅, 回收

CLC Number: