PDF《牛粪和核桃壳生物炭对水溶液中 Cd2+和Zn2+的吸附研究》

The adsorption of Cd2+ and Zn2+ in aqueous solutions by dairy manure and walnut shell biochar LIU Jian-nan1 , FENG Ji-meng2 , LI Dan1 , WANG Xin-ze1 , SHAN Ai-dang3* (1.

School of Environmental Science and Engineering, Shanghai Jiao tong University, Shanghai 200240, China;

2.School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China;

3.School of Materials Science and Engineering, Shanghai Jiao tong Uni? versity, Shanghai 200240, China) Abstract: In order to remove Cd2+ and Zn2+ from aqueous solutions efficiently, using dairy manure and walnut shells as raw materials, bio? char was prepared at different pyrolysis temperatures. The adsorption equilibrium method and dynamic adsorption method were used to study the kinetic characteristics of biochar and the adsorption effect of biochar on Cd2+ and Zn2+ in aqueous solutions. The adsorption mech? anism was investigated by detecting biochar before and after adsorption using X-ray diffraction and Fourier transform infrared spectrosco? py. The results showed that biomass materials and pyrolysis temperature were two major factors affecting the adsorption effect of biochar. The adsorption effect of dairy manure biochar was greater than that of walnut shell biochar, and the adsorption effect of biochar prepared at

700 ℃ was greater than that of biochar prepared at

300 ℃. Langmuir isotherms were more suitable for describing the Cd2+ and Zn2+ adsorp? tion mechanisms of biochar. Dairy manure biochar prepared at

700 ℃ (DM 700)was the most effective adsorption material for Cd2+ and Zn2+ , with maximum adsorption capacities of 117.5 mg・g-1 and 59.4 mg・g-1 , respectively. The adsorption kinetics of DM700 fit better with pseudo-second order kinetics and included the rapid stage and slow stage. Ion exchange and the complex reaction between hydroxyl and carboxyl groups in biochar with Cd2+ and Zn2+ were the main adsorption mechanisms. CdCO3 and Zn3 (PO4 )

2 precipitates were formed after Cd2+ and Zn2+ were adsorbed. Therefore, DM

700 has great potential as an adsorbent for Cd2+ and Zn2+ .This study provides a theoretical ba? sis and application reference for biochar removal of heavy metals from water and soil. Keywords: dairy manure biochar;

walnut shell biochar;

Cd2+ ;

Zn2+ ;

adsorption 2019,

38 (5) : 1142-1150 2019年5月农业环境科学学报Journal of Agro?Environment Science 刘剑楠, 封吉猛, 李丹, 等. 牛粪和核桃壳生物炭对水溶液中Cd2+ 和Zn2+ 的吸附研究[J]. 农业环境科学学报, 2019,

38 (5) : 1142-1150. LIU Jian-nan, FENG Ji-meng, LI Dan, et al. The adsorption of Cd2+ and Zn2+ in aqueous solutions by dairy manure and walnut shell biochar[J]. Journal of Agro-Environment Science, 2019,

38 (5) : 1142-1150. 牛粪和核桃壳生物炭对水溶液中Cd2+ 和Zn2+ 的吸附研究 刘剑楠1 , 封吉猛2 , 李丹1 , 王欣泽1 , 单爱党3* (1.上海交通大学环境科学与工程学院, 上海 200240;

2.上海交通大学农业与生物学院, 上海 200240;

3.上海交通大学材料科学 与工程学院, 上海 200240) 收稿日期: 2018-05-31 录用日期: 2018-11-07 作者简介: 刘剑楠 (1994―) , 女, 山东聊城人, 硕士研究生, 主要从事土壤修复材料研究.E-mail: [email protected] *通信作者: 单爱党 E-mail: [email protected] 摘要: 为有效去除水溶液中 Cd2+ 和Zn2+ , 以牛粪和核桃壳为原料, 在不同热解温度下制取生物炭, 采用等温吸附法和动力吸附法 研究生物炭对水溶液中 Cd2+ 和Zn2+ 的吸附效果和动力学特性, 通过生物炭吸附前后的 XRD 和FTIR 表征对比, 探究其吸附机理. 结果表明: 生物质原材料的种类和热裂解温度是影响生物炭吸附效果的两大因素, 牛粪生物炭比核桃壳生物炭吸附效果好,