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应用生态学报 ›› 2018, Vol. 29 ›› Issue (4): 1328-1338.doi: 10.13287/j.1001-9332.201804.034

• 研究论文 • 上一篇    下一篇

不同炭化温度制备的蚕丝被废弃物生物炭对重金属Cd2+的吸附性能

计海洋1,2, 汪玉瑛2,3, 吕豪豪2,3, 刘玉学2,3, 杨瑞芹4,5, 杨生茂1,2,3*   

  1. 1浙江师范大学化学与生命科学学院, 浙江金华 321004;
    2浙江省农业科学院环境资源与土壤肥料研究所, 杭州 310021;
    3浙江省生物炭工程技术研究中心, 杭州 310021;
    4浙江省农业生物资源生化制造协同创新中心, 杭州 310023;
    5浙江省农产品化学与生物加工技术重点实验室, 杭州 310023;
  • 收稿日期:2017-07-24 出版日期:2018-04-18 发布日期:2018-04-18
  • 通讯作者: * E-mail: yangshengmao@263.net
  • 作者简介:计海洋,女,1991年生,硕士研究生.主要从事生物炭功能材料研发及其环境效应研究. E-mail: jhy19910524@126.com
  • 基金资助:

    本文由浙江省自然科学基金项目(LQ17D020002,LY16D010004)、浙江省农业生物资源生化制造协同创新中心/浙江省农产品化学与生物加工技术重点实验室开放基金项目(2016KF0116)资助

Cadmium adsorption by biochar prepared from pyrolysis of silk waste at different temperatures

JI Hai-yang1,2, WANG Yu-ying2,3 , LYU Hao-hao2,3, LIU Yu-xue2,3, YANG Rui-qin4,5, YANG Sheng-mao1,2,3*   

  1. 1College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, Zhejiang, China;
    2Institute of Environment, Resource, Soil and Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China;
    3Engineering Research Center of Biochar of Zhejiang Province, Hangzhou 310021, China;
    4Zhejiang Provincial Collaborative Innovation Center of Agricultural Biological Resources Biochemical Manufacturing, Hangzhou 310023, China;
    5Zhejiang Provincial Key Laboratory for Chem&Bio Processing Technology of Farm Product, Hangzhou 310023, China;
  • Received:2017-07-24 Online:2018-04-18 Published:2018-04-18
  • Contact: * E-mail: yangshengmao@263.net
  • Supported by:

    This work was supported by the Natural Science Foundation of Zhejiang(LQ17D020002, LY16D010004) and the Zhejiang Provincial CollaborativeInnovation Center of Agricultural Biological Resources Biochemical Manufacturing/Zhejiang Provincial Key Labarotory for Chem&Bio Processing Technology of Farm Product open fund (2016KF0116).

摘要: 以蚕丝被废弃物为原料,在300、500和700 ℃高温缺氧条件下热解炭化制备成3种生物炭(BC300、BC500和BC700).利用扫描电镜(SEM)、傅里叶红外光谱仪(FT-IR)、X-射线衍射仪(XRD)、比表面积分析仪等对其理化性质进行表征,并研究了不同温度下制备的生物炭对溶液中Cd2+的吸附特性.结果表明: 随着炭化温度上升,BET比表面积、pH、灰分均增大,生物炭表面形态结构越来越不规则.XRD结果显示:不同温度下获得的生物炭中均含有一定量的方解石,FT-IR光谱图上的峰主要为-OH和方解石典型的吸收峰;pH对生物炭吸附Cd2+的影响不大;Langmuir方程能更好地拟合3种生物炭对Cd2+的吸附等温过程,其最大吸附量分别为25.61、52.41和91.07 mg·g-1.3种生物炭对Cd2+吸附过程均更符合准二级动力学方程,且BC700对Cd2+的吸附效果最佳.进一步研究离子浓度及阳离子共存对BC700吸附Cd2+的影响,结果显示: NaCl浓度越高,对Cd2+的吸附抑制越明显;共存阳离子中,Ca2+和Mg2+对Cd2+的吸附抑制更明显,而K+几乎无影响.因此,以蚕丝被废弃物制备的生物炭作为去除水体中Cd2+的吸附剂具有较强的应用潜力.

关键词: Cd2+, 吸附, 蚕丝被废弃物, 生物炭, 炭化温度

Abstract: In this study, biochars (BC300, BC500 and BC700) were produced from silk waste through pyrolysis under oxygen-limited condition at 300, 500 and 700 ℃, respectively. The physicochemical properties of biochar were detected by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffractometer (XRD) and specific surface area analyzer. The Cd2+ adsorption capacities of biochars were investigated. Results showed that BET surface area, pH, and ash were increased with the increases of pyrolysis temperature. SEM images showed that the surfaces of biochars were rough and irregular. XRD and FT-IR results showed that all the silk waste biochars obtained at different temperatures contained calcite. pH had limited influence on the removal efficiency of biochar for Cd2+. Langmuir isotherm fitted the experimental data quite well. The Langmuir monolayer adsorption capacity of BC300, BC500, and BC700 were 25.61, 52.41, and 91.07 mg·g-1, respectively. The adsorption of Cd2+ onto the biochars obeyed a pseudo second-order kinetic model, with the BC700 showing the best removal efficiency. Further-more, the effects of the ionic strength and coexisting cations on Cd2+ removal were investigated. The results showed that the removal of Cd2+ was decreased with the increases of NaCl. Among the coexisting cations, the removal of Cd2+ was decreased by Ca2+ and Mg2+, while K+ had limited effect on the removal of Cd2+. In conclusion, the biochar derived from silk waste pyrolysis is a potential attractive adsorbent for the removal of Cd2+ from water.

Key words: biochar, silk waste, adsorption., pyrolysis temperature, Cd2+