摘要
选用小麦秸秆为生物质代表,在200、400、500℃不同温度下,限氧碳化制备生物碳质吸附剂M200、M400、M500,分别考察其对Cr(Ⅵ)的吸附性能,通过观察等温吸附模型和吸附动力学方程,分析其可能的吸附机理.研究结果表明,三种生物碳质对Cr(Ⅵ)的吸附量随着初始浓度的增加而增加,6h达到吸附平衡;吸附反应符合准二级动力学方程;吸附等温线结果表明,生物碳质对Cr(Ⅵ)的吸附可以用Langmuir模型很好描述;小麦秸秆生物碳质对Cr(Ⅵ)的最大吸附量随着碳化温度的升高而降低,分别为35.778、19.79、19.227mg/g.小麦秸秆生物碳质是去除含铬废水中Cr(Ⅵ)的廉价与良好的吸附剂.
Selecting wheat straw for the biological substance,the biological carbon adsorbents M200,M400,and M500 were prepared with limited oxygen carbonization at different temperature 200,400,and 500 ℃,respectively.Their Cr（Ⅵ） adsorptive capability was investigated respectively.By using isothermal adsorption model and adsorption dynamic equation,their possible adsorption mechanism was analyzed.The investigation result showed that the adsorptive amount of these three biological carbon substances increased with the initial concentration until the adsorption equilibrium was reached after 6 hours.The adsorptive reaction agreed with the quasi-second-order dynamic equation.It was shown by the adsorptive isotherm that the Cr（Ⅵ） adsorption with the biological carbon substance could well be characterized with Langmuir mode.The maximum Cr（Ⅵ） adsorptive amount with biological carbon substance of wheat straw was decreased with the carbonization temperature,being 35.778,19.79,and 19.227 mg/g respectively.The biological carbon substance of wheat straw would be a cheap and good adsorbent for removal of Cr（Ⅵ） from chrome-laden wastewater.
出处
《兰州理工大学学报》
CAS
北大核心
2011年第2期64-68,共5页
Journal of Lanzhou University of Technology
基金
甘肃省自然科学基金(0809RJZA009)
关键词
生物碳质
Cr(Ⅵ)
吸附
biological carbon substance
Cr（Ⅵ）
adsorption
