改性豆饼生物质炭对铅的吸附特性  

Adsorption of Pb in Solution By Modified Bean Cake Biochar

作　　者：孟莉蓉 俞浩丹 杨婷婷[1] 尹微琴[1] 侯建华[1,2] 王圣森 王小治[1,2,3] MENG Li-rong;YU Hao-dan;YANG Ting-ting;YIN Wei-qin;HOU Jian-hua;WANG Sheng-sen;WANG Xiao-zhi(College of Environmental Science and Engineering,Yangzhou University,Yangzhou 225127,China;Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization,Nanjing 210095,China;Institutes of Agricultural Science and Technology Development,Yangzhou University,Yangzhou 225127,China)

机构地区：[1]扬州大学环境科学与工程学院,江苏扬州225127 [2]江苏省有机固体废弃物资源化协同创新中心,江苏南京210095 [3]扬州大学农业科技发展研究院,江苏扬州225127

出　　处：《生态与农村环境学报》2018年第7期643-650,共8页Journal of Ecology and Rural Environment

基　　金：国家自然科学基金(31772394);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

摘　　要：以豆饼为前驱体制备生物炭,并对其进行KOH刻蚀改性,利用场发射扫描电子显微镜(SEM)、比表面积及孔径分析仪(BET)、X-ray能谱仪(EDS)、多晶X射线衍射仪(XRD)和傅里叶变换红外光谱仪(FTIR)等对豆饼生物炭(SYB)和改性豆饼生物炭(SYBK)进行表征,比较SYB和SYBK对Pb^(2+)的吸附性能,并研究时间、Pb^(2+)溶液初始浓度和pH对吸附效果的影响规律。结果表明,SYBK含有更丰富的官能团,且比表面积大大增加,SYB和SYBK对Pb^(2+)的等温吸附曲线均符合Langmuir吸附模型,SYBK对Pb^(2+)的实际最大吸附量达711.0 mg·g^(-1),明显高于SYB(293.0 mg·g^(-1))。对比SYB和SYBK的XRD谱图可知,吸附过程中SYB和SYBK表面形成了碱式碳酸铅沉淀,且吸附后溶液中含有大量矿物阳离子Ca^(2+)、Mg^(2+)等。上述结果可为高效吸附环境中Pb的生物炭的修饰或改性方法的研究提供参考。In this study,bean cake derived biochar(SYB)was modified by potassium hydroxide(KOH)(SYBK)to improve sorptive removal of Pb^2+from aqueous solutions.Batch sorption experiments were carried out with different sorption time,initial sorbate concentrations and pH values.The pristine and Pb^2+spent sorbents were characterized with the field emission scanning electron microscopy(SEM),specific surface area and pore size analyzer(BET),X-ray spectrometer(EDS),X-ray diffraction(XRD)and Fourier transform infrared spectroscopy(FTIR).Results show that the SYBK has more abundant surface functional groups and higher specific surface area.Pb 2+adsorption data by SYB and SYBK were well fitted with the Langmuir adsorption model and the predicted maximum adsorption capacities were 711.0 and 293.0 mg·g^-1 for SYBK and SYB,respectively.The XRD spectra of both spent sorbents revealed that Pb 3(CO 3)2(OH)2 precipitate was formed after sorption reaction.Besides,large quantities of alkaline cations(e.g.,Ca 2+and Mg^2+)was released into solution after sorption.The results above can provide reference for preparation of biochar-based sorbents for Pb 2+removal from aqueous solutions.

关 键 词：豆饼 生物炭 改性 铅 

分 类 号：X52[环境科学与工程—环境工程] X712