摘要
以木子壳、米糠为前驱体,650℃制备生物炭,通过扫描电子显微镜、X射线粉末衍射仪和比表面积分析仪等手段表征其物理化学性质,探究粒径、矿物组分、初始浓度及时间等因素对生物炭吸附Pb^(2+)效果的影响。结果表明,木子壳生物炭比表面积虽远小于米糠生物炭,但对溶液中Pb^(2+)有很强的吸附效果,等温吸附曲线符合Langmuir吸附模型,最大吸附量达165.62 mg·g^(-1),明显高于米糠生物炭(58.92 mg·g^(-1))。同时XRD分析显示木子壳生物炭含大量矿物组分且吸附Pb^(2+)后有沉淀生成。
Two raw materials, i.e., rice bran and camellia shell, were used to produce biochars via pyrolysis at 650 ℃. The physical and chemical properties of biochars were characterized by scanning electron microscopy（SEM）, X-ray diffraction（XRD）, and Brunauer-Emmett-Teller（BET）surface area analyses. The effects of particle size, mineral composition, contact time, and initial Pb^（2＋）concentration on Pb^（2＋）adsorption by biochars were examined. The results showed that compared to rice bran-derived biochar, camellia shell-derived biochar had smaller specific surface area, but was more effective in removing heavy metals from aqueous solutions. The adsorption isotherm of Pb^（2＋）by camellia shell-derived biochar fit the Langmuir model well, and the adsorption capacity was 165.62 mg·g^（-1）, which was higher than that of rice bran-derived biochar（58. 92 mg·g^（-1））. The results of XRD analysis showed that camellia shell-derived biochar contained a large amount of mineral components and appeared as a precipitate after adsorption.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2017年第8期1627-1633,共7页
Journal of Agro-Environment Science
基金
江苏省社会发展项目(BE2015661)
江苏省六大人才高峰项目(2013-NY-017)
江苏省环境材料与环境工程重点实验室项目
江苏省研究生科研创新计划项目(SJLX16-0599)~~
