Bioadsorption of methyl violet from aqueous solution onto Pu-erh tea powder.
Bioadsorption of methyl violet from aqueous solution onto Pu-erh tea powder.
复制标题
DOI：
10.1016/j.jhazmat.2010.02.054
复制
发表时间：
2010-07
影响因子：
13.6
通讯作者：
Ping Li;Yabin Su;Yan Wang;Bo Liu;Li-ming Sun
中科院分区：
文献类型：
--
作者：
Ping Li;Yabin Su;Yan Wang;Bo Liu;Li-ming Sun
采用中国特有的普洱茶粉（PTP）对阳离子染料甲基紫（MV）进行吸附，并对活性成分进行浸出。在25℃条件下，考察了pH值、接触时间、吸附剂用量、初始浓度、吸附剂粒径等因素对甲基紫脱除效果的影响。结果表明，吸附剂的粒径对吸附过程有显著影响，纳米级PTP颗粒的吸附效率最好。平衡数据采用Langmuir， Freundlich和Tempkin等温线模型进行分析。伪二级动力学模型最好地解释了任何粒径的PTP对MV的吸附。采用颗粒内扩散模型对吸附过程进行分析，发现吸附颗粒越小，边界层效应越大。
Chinese unique Pu-erh tea powder (PTP), with leached active ingredients, was used here to adsorb methyl violet (MV), a cationic dye. The effects of several variables on the removal of methyl violet were studied at 25°C, including pH value, contact time, quantity of the adsorbent, initial concentration, and particle size of the adsorbent. The results showed that the particle size of the adsorbent significantly affected the adsorption process, and the nano-sized PTP particles had the best adsorption efficiency. The equilibrium data was analyzed using Langmuir, Freundlich, and Tempkin isotherms models. The pseudo-second-order kinetics model best explained the MV adsorption by PTP of any particle size. The intra-particle diffusion model was also used to analyze the adsorption process, and it was found that smaller adsorbent particles had a bigger boundary layer effect.