Zhejiang Provincial Key Laboratory of Chemical Utilization of Forestry Biomass, Zhejiang A & F University, Lin'an, Zhejiang 311300, PR China.
Zhejiang Provincial Key Laboratory of Chemical Utilization of Forestry Biomass, Zhejiang A & F University, Lin'an, Zhejiang 311300, PR China.
Chemosphere. 2014 Sep;111:225-31. doi: 10.1016/j.chemosphere.2014.03.118. Epub 2014 May 6.
Chemically modified bamboo (CMB) was utilized for removing methylene blue (MB) from aqueous media in the present study. The adsorbent was characterized by Fourier transform infrared (FTIR) spectra and elemental analysis, which confirms that carboxyl groups and diethylenetriamine were successfully introduced into the surface of bamboo. The effects of initial MB concentration (100-900mgL(-1)), contact time (15-315min), the pH of the solution (3-10), temperature (298-318K), adsorbent dosage (0.4-2.6gL(-1)) and salt concentration on the adsorption efficiency of CMB towards MB were investigated. It was found that the adsorption of MB in CMB fits Langmuir mode well, and the maximum adsorption capacity of CMB achieved 606mgg(-1) at 298K, which is much higher than those obtained from previously investigated bioadsorbents. The adsorption kinetics can be described by pseudo-second-order kinetic model, and the adsorption of MB on CMB was an exothermic process. The results of the present study suggest that CMB is an effective biosorbent for removal of organic pollutants from aqueous solutions.
本研究利用化学改性竹（CMB）从水溶液中去除亚甲基蓝（MB）。通过傅里叶变换红外（FTIR）光谱和元素分析对吸附剂进行了表征，证实了羧基和二乙烯三胺成功引入到竹材表面。考察了初始 MB 浓度（100-900mgL(-1)）、接触时间（15-315min）、溶液 pH 值（3-10）、温度（298-318K）、吸附剂用量（0.4-2.6gL(-1)) 和盐浓度对 CMB 吸附 MB 的影响。结果表明，MB 在 CMB 上的吸附很好地符合朗缪尔模型，在 298K 时 CMB 的最大吸附容量达到 606mgg(-1)，远高于先前研究的生物吸附剂。吸附动力学可以用拟二级动力学模型来描述，MB 在 CMB 上的吸附是一个放热过程。本研究结果表明，CMB 是一种从水溶液中去除有机污染物的有效生物吸附剂。
