改性西瓜皮生物炭对废水中Pb^(2+)的吸附研究  

Study on the High-Efficiency Adsorption of Pb^(2+) by the Modified Watermelon Peel Biochar

作　　者：苏德仁 陈凤鸣 李汇春 毕景望 王亚琢[3,4] SU De-ren;CHEN Feng-ming;LI Hui-chun;BI Jing-wang;WANG Ya-zhuo(Guangdong Fengle Energy Technology Co.,Ltd.,Guangzhou 511340,China;Shandong HI-SPEED Co.Ltd.,Jinan 250014,China;Guangzhou Institute of Energy Conversion,Chinese Academy of Sciences,Guangzhou 510640,China;Foshan Kehengbo Environmental Protection Technology Co.,Ltd.,Foshan 528225,Guangdong,China)

机构地区：[1]广东丰乐能源科技有限公司,广州511340 [2]山东高速股份有限公司,济南250014 [3]中国科学院广州能源研究所,广州510640 [4]佛山市科恒博环保技术有限公司,广东佛山528225

出　　处：《新能源进展》2021年第6期496-505,共10页Advances in New and Renewable Energy

基　　金：国家自然科学基金项目(51776211)。

摘　　要：以西瓜皮为原料制备生物炭(WM)吸附水中的Zn^(2+),再将吸附后的生物炭进行二次热解,制得WM-Zn并用于吸附水中的Pb^(2+)。研究表明,WM-Zn对Pb^(2+)的吸附容量(163.84 mg/g)高于WM的吸附容量(87.64 mg/g)。利用X射线光电子能谱(XPS)、傅里叶变换红外光谱(FTIR)、元素分析(EA)、X射线衍射(XRD)、吸附比表面测试法(BET)和Zeta电位对生物炭进行了表征,发现WM-Zn表面孔结构的扩大和官能团的增多均有助于Pb^(2+)的去除,WM-Zn对Pb^(2+)的吸附可归结为官能团络合、静电吸附、物理吸附和沉淀作用。此外,WM吸附Zn^(2+)和WM-Zn吸附Pb^(2+)均符合Langmuir等温吸附模型和拟二级动力学模型,表明吸附过程是以单分子层吸附为主的化学吸附。在吸附−解吸循环实验中,WM-Zn在第6次循环中吸附量可达到87.36 mg/g,表明WM-Zn吸附具有良好的可重复性。Watermelon rind biochar(WM)prepared by pyrolysis was used to adsorb Zn^(2+)in water,and then pyrolyzed again to prepare biochar adsorbent(WM-Zn).WM-Zn was used to adsorb Pb^(2+)(WN-Zn-Pb)in water.The adsorption capacity of WM-Zn for Pb^(2+)(163.84 mg/g)was higher than that of WM(87.64 mg/g).The biochar was characterized by XPS,FTIR,EA,XRD,BET,and Zeta.The results showed that the expansion of the surface pore structure of WM-Zn and the increase of functional groups all contribute to the removal of Pb^(2+).It was found that the adsorption of Pb^(2+)by WM-Zn can be attributed to functional group complexation,electrostatic adsorption,physical adsorption and precipitation.In addition,WM adsorption of Zn^(2+)and WM-Zn adsorption of Pb^(2+)were in line with the Langmuir isotherm adsorption model and the pseudo-second-order kinetic model,which indicated that the adsorption process was chemical adsorption based on monolayer adsorption.In the adsorption-desorption cycle experiment,the adsorption amount of WM-Zn in the sixth cycle reached 87.36 mg/g,indicating that WM-Zn had good recoverability.

关 键 词：Zn^(2+) Pb^(2+) 生物炭 吸附剂 热解 

分 类 号：TK6[动力工程及工程热物理—生物能]