摘要
炭化是污泥资资源化利用的重要途径。研究了污泥基生物炭对Cd的吸附过程,探讨了污泥基生物炭吸附重金属Cd的动力学和热力学特征。结果显示污泥基生物炭对Cd的吸附符合准二级动力学方程。Freundlich方程能较好的模拟吸附等温线。随着温度增加,吸附呈现逐渐增强趋势。吸附热力学结果显示35℃时吸附并非自发进行,随着温度增加,吸附转为吸热并自发进行。污泥基生物炭对Cd的吸附主要以化学吸附为主,同时存在多种机制共同作用。研究结果表明污泥基生物炭有作为重金属Cd污染废水修复剂的潜力。
Carbonization is an important pathway for sludge resource utilization. The adsorption of Cd2 ＋on sewage-derived biochar,especially the kinetic and isotherm characteristics of such,was investigated in this study.The kinetics showed that adsorption of Cd2 ＋on sewage-derived biochar could be fitted to a second-order kinetic model. Adsorption data weredescribedby the Freundlich isotherm equation. With an increase in temperature,the adsorption amount increased. The thermodynamics results showed that the adsorption process was not spontaneous at 35 ℃. However,with an increase in temperature,the adsorption could be spontaneous. Chemical adsorption was predominant. The adsorption of Cd2 ＋on sewage-derived biochar was controlled by various mechanisms interactions. Sludge-derived biochar could be used effectively as an adsorbent to remove Cd from wastewater.
出处
《环境工程学报》
CAS
CSCD
北大核心
2016年第10期5971-5977,共7页
Chinese Journal of Environmental Engineering
基金
安徽农业大学青年基金资助项目(2014zr004
jz2015-23)
关键词
污泥基生物炭
CD
动力学
热力学
sewage-derived biochar
cadmium
kinetics
thermodynamic
