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磁性硅藻土的制备及其性能

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韩琳, 陈宋辉, 于鹏, 李溪, 赵吉, 徐炎华. 磁性硅藻土的制备及其性能[J]. 环境工程学报, 2016, 10(6): 2987-2991. doi: 10.12030/j.cjee.201501046
引用本文: 韩琳, 陈宋辉, 于鹏, 李溪, 赵吉, 徐炎华. 磁性硅藻土的制备及其性能[J]. 环境工程学报, 2016, 10(6): 2987-2991. doi: 10.12030/j.cjee.201501046
shu
Han Lin, Chen Songhui, Yu Peng, Li Xi, Zhao Ji, Xu Yanhua. Preparation and performance of magnetic diatomite[J]. Chinese Journal of Environmental Engineering, 2016, 10(6): 2987-2991. doi: 10.12030/j.cjee.201501046
Citation: Han Lin, Chen Songhui, Yu Peng, Li Xi, Zhao Ji, Xu Yanhua. Preparation and performance of magnetic diatomite[J]. Chinese Journal of Environmental Engineering, 2016, 10(6): 2987-2991. doi: 10.12030/j.cjee.201501046
shu

磁性硅藻土的制备及其性能

  • 1.

    南京工业大学环境学院, 江苏省工业节水减排重点试验室, 南京 210009

  • 2.

    南京工大环境科技有限公司, 南京 210009

  • 基金项目:

    江苏省自然科学基金重点研究专项(BK2011016)

    江苏省环保科研课题项目(201004)

  • 中图分类号: X703

Preparation and performance of magnetic diatomite

  • 1.

    Jiangsu Key Laboratory of Industrial Water-Conservation & Emission Reduction, College of Environment, Nanjing Tech University, Nanjing 210009, China

  • 2.

    NJTECH Environment Technology Co. Ltd., Nanjing 210009, China

  • Fund Project:

  • 摘要: 针对现有硅藻土吸附容量小和固液分离难的问题,采用共沉淀法制备2种磁改性硅藻土:Ⅰ和Ⅱ,通过扫描电镜(SEM)、比表面积测定(BET)、X射线衍射(XRD)等对制备的磁性硅藻土进行结构分析,并采用磁滞回线评估其磁性;考察了溶液pH、吸附剂用量和吸附时间对其吸附硝基苯的影响以及吸附饱和后的固液分离性能。结果表明:2种磁改性样品的饱和磁化强度分别为26.28 emu/g和4.8 emu/g,比表面积分别为39.242 m2/g和60.588 m2/g,为原土的1.3倍和2倍;对硝基苯的去除率分别达74.95%和95.2%,为原土的1.8倍和2.3倍;吸附饱和的磁改性样品在外加磁场作用下可迅速实现固液分离,且分离后2种磁改性样品溶液的悬浮物浓度分别为8.6 mg/L和9.8 mg/L。
    Abstract: In view of the low adsorption capacity and difficult solid-liquid separation of existing diatomites, two kinds of magnetic diatomite, viz, I and II, were prepared by a common precipitation method. Scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET) surface area analysis, and X-ray diffraction (XRD) were used to characterize the magnetic diatomites, and their magnetic hysteresis loops were evaluated. The adsorption of nitrobenzene by the two samples was investigated by changing the pH, adsorbent amount, and adsorption time, and the performance during solid-liquid separation after saturated adsorption was also discussed. The results showed that the saturated magnetizations of the two samples were 26.28 and 4.8 emu/g, while the specific surface areas were 39.242 and 60.588 m2/g, which were 1.3 and 2 times that of the raw diatomite. The nitrobenzene removal rates reached 74.95% and 95.2%, which were 1.8 and 2.3 times that of the raw diatomite. The magnetic samples could be separated quickly under magnetic fields, and the concentration SS were 8.6 and 9.8 mg/L in two modified sample solutions after separation.
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    [2] 刘洁, 赵东风. 硅藻土的研究现状及进展. 环境科学与管理, 2009, 34(5): 104-106 Liu Jie, Zhao Dongfeng. The present situation and development of diatomite. Environmental Science and Management, 2009, 34(5): 104-106(in Chinese)
    [3] Arik H. Synthesis of Si3N4 by the carbo-thermal reduction and nitridation of diatomite. Journal of the European Ceramic Society, 2003, 23(12): 2005-2014
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  • 收稿日期:  2015-04-01
  • 刊出日期:  2016-06-03
韩琳, 陈宋辉, 于鹏, 李溪, 赵吉, 徐炎华. 磁性硅藻土的制备及其性能[J]. 环境工程学报, 2016, 10(6): 2987-2991. doi: 10.12030/j.cjee.201501046
引用本文: 韩琳, 陈宋辉, 于鹏, 李溪, 赵吉, 徐炎华. 磁性硅藻土的制备及其性能[J]. 环境工程学报, 2016, 10(6): 2987-2991. doi: 10.12030/j.cjee.201501046
shu
Han Lin, Chen Songhui, Yu Peng, Li Xi, Zhao Ji, Xu Yanhua. Preparation and performance of magnetic diatomite[J]. Chinese Journal of Environmental Engineering, 2016, 10(6): 2987-2991. doi: 10.12030/j.cjee.201501046
Citation: Han Lin, Chen Songhui, Yu Peng, Li Xi, Zhao Ji, Xu Yanhua. Preparation and performance of magnetic diatomite[J]. Chinese Journal of Environmental Engineering, 2016, 10(6): 2987-2991. doi: 10.12030/j.cjee.201501046
shu

磁性硅藻土的制备及其性能

  • 1. 南京工业大学环境学院, 江苏省工业节水减排重点试验室, 南京 210009
  • 2. 南京工大环境科技有限公司, 南京 210009
  • 收稿日期:  2015-04-01
基金项目:

江苏省自然科学基金重点研究专项(BK2011016)

江苏省环保科研课题项目(201004)

摘要: 针对现有硅藻土吸附容量小和固液分离难的问题,采用共沉淀法制备2种磁改性硅藻土:Ⅰ和Ⅱ,通过扫描电镜(SEM)、比表面积测定(BET)、X射线衍射(XRD)等对制备的磁性硅藻土进行结构分析,并采用磁滞回线评估其磁性;考察了溶液pH、吸附剂用量和吸附时间对其吸附硝基苯的影响以及吸附饱和后的固液分离性能。结果表明:2种磁改性样品的饱和磁化强度分别为26.28 emu/g和4.8 emu/g,比表面积分别为39.242 m2/g和60.588 m2/g,为原土的1.3倍和2倍;对硝基苯的去除率分别达74.95%和95.2%,为原土的1.8倍和2.3倍;吸附饱和的磁改性样品在外加磁场作用下可迅速实现固液分离,且分离后2种磁改性样品溶液的悬浮物浓度分别为8.6 mg/L和9.8 mg/L。

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