文章摘要
刘剑楠,封吉猛,李丹,王欣泽,单爱党.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.
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
投稿时间:2018-05-31  
DOI:10.11654/jaes.2018-0718
中文关键词: 牛粪生物炭  核桃壳生物炭  Cd2+  Zn2+  吸附
英文关键词: dairy manure biochar  walnut shell biochar  Cd2+  Zn2+  adsorption
基金项目:
作者单位E-mail
刘剑楠 上海交通大学环境科学与工程学院, 上海 200240  
封吉猛 上海交通大学农业与生物学院, 上海 200240  
李丹 上海交通大学环境科学与工程学院, 上海 200240  
王欣泽 上海交通大学环境科学与工程学院, 上海 200240  
单爱党 上海交通大学材料科学与工程学院, 上海 200240 adshan@sjtu.edu.cn 
摘要点击次数: 213
全文下载次数: 276
中文摘要:
      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,700℃制备的生物炭比300℃制备的生物炭吸附效果好;生物炭对Cd2+和Zn2+的吸附符合Langmuir方程;700℃制备的牛粪生物炭(DM700)对Cd2+和Zn2+的吸附性能最佳,饱和吸附量分别为117.5 mg·g-1和59.4 mg·g-1,其吸附过程由快速吸附和慢速吸附两个阶段组成,符合准二级动力学方程;吸附机理主要是生物炭中的羟基和羧基与Cd2+、Zn2+间发生离子交换和络合反应,Cd2+、Zn2+被吸附后进一步生成CdCO3和Zn3(PO42沉淀。这说明,DM700具备作为水溶液中Cd2+、Zn2+吸附剂的潜力,本研究为生物炭去除水中重金属和土壤重金属污染的修复提供了理论依据与应用参考。
英文摘要:
      In order to remove Cd2+ and Zn2+ from aqueous solutions efficiently, using dairy manure and walnut shells as raw materials, biochar 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 mechanism was investigated by detecting biochar before and after adsorption using X-ray diffraction and Fourier transform infrared spectroscopy. 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+ adsorption 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 basis and application reference for biochar removal of heavy metals from water and soil.
HTML    查看全文   查看/发表评论  下载PDF阅读器