中孔活性炭对水溶液中Cr^(3+)的吸附  

Adsorption of Cr^(3+) from Aqueous Solution on Mesoporous Activated Carbon

作　　者：万柳[1] 童仕唐[1] 

机构地区：[1]武汉科技大学化学工程与技术学院,湖北武汉430081

出　　处：《化工环保》2012年第1期75-80,共6页Environmental Protection of Chemical Industry

基　　金：国家自然科学基金资助项目(50574071和51174150)

摘　　要：采用模板法和氢氧化钾化学活化法制备出不同中孔率的中孔活性炭并用于水中Cr3+的静态吸附,探讨了中孔活性炭吸附Cr3+的影响因素。实验结果表明,当溶液pH为6.0、吸附温度为50℃、吸附时间为120 min、活性炭加入量为2.0 g/L以及活性炭中孔率为80.0%～90.0%时,中孔活性炭对溶液中Cr3+的去除率达到98.5%。分别采用Langmuir和Freundlich方程拟合活性炭对Cr3+吸附的等温线,发现Langmuir等温吸附模型对活性炭吸附Cr3+拟合程度更好。活性炭中孔率的增大有利于提高Cr3+的平衡吸附量,但同时还受到活性炭表面酸总量的影响。吸附Cr3+前、后活性炭的FTIR谱图表明,Cr3+与活性炭表面含氧官能团发生了离子交换反应。The mesoporous activated carbon （MAC）with different porosity was prepared by template method and KOH activation method, and was used in static adsorbing Cr^3＋ from aqueous solution. The factors affecting Cr^3＋ adsorption on MAC were studied. The experimental results show that when the solution pH is 6.0, the adsorption temperature is 50 ℃, the adsorption time is 120 min, the MAC dosage is 2.0 g/L and the porosity of MAC is 80.0% - 90.0%, the Cr^3＋ removal rate is 98.5%. The Langmuir and Freundlich isotherm equations were used to describe the adsorption isotherm of Cr^3＋ on MAC. It is found that Langmuir isotherm equation is fitted better. The Cr^3＋ equilibrium adsorption quantity increases with the increasing of MAC＇ s porosity, but is influenced by the total amount of acid on MAC＇ s surface. The FTIR spectra of MAC＇ s before and after adsorption show that the ion exchange reaction has taken place between Cr^3＋ and oxygen-containing functional groups on MAC＇ s surface.

关 键 词：中孔活性炭 三价铬 吸附 中孔率 废水处理 

分 类 号：X703.1[环境科学与工程—环境工程]