Centre for the Environment, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India.
J Hazard Mater. 2011 Feb 28;186(2-3):1088-96. doi: 10.1016/j.jhazmat.2010.11.104. Epub 2010 Dec 3.
In this study, various activation methods have been employed to examine the potential reuse of tannery residual biomass (TRB) obtained from vegetable tanning process for the removal of Cr(VI) and Rhodamine B (RB) from aqueous solution. The maximum BET surface area (10.42 m(2)/g), honey comb pore distribution and uptake of both Cr(VI) and RB were achieved when only 3-fold volume of HCl was used to activate the biomass. The pH and temperature experiment showed that they have considerable impact on the adsorption capacity of the used adsorbent. The presence of other ions (Na(+), Ca(2+) and NH(4)(+)) significantly reduces the metal uptake but marginal enhancement in the dye removal was observed when Na(+) and NH(4)(+) ions were present in the solution. The equilibrium data fitted satisfactorily with the Langmuir model and monolayer sorption capacity obtained as 177-217 and 213-250 mg/g for Cr(VI) and RB at 30-50°C, respectively. The sorption kinetics was found to follow the pseudo-second-order kinetic model. The increase in adsorption capacity for both metal and dye with increase in temperature indicates that the uptake was endothermic in nature. The results indicate that the HCl modified TRB (A-TRB) could be employed as a low cost adsorbent for the removal of both Cr(VI) and RB from the aqueous solution including industrial wastewater.
在这项研究中，采用了各种活化方法来研究从植物鞣制过程中获得的制革厂剩余生物质（TRB）是否可用于去除水溶液中的 Cr(VI)和 Rhodamine B（RB）。仅使用 3 倍体积的 HCl 活化生物质，即可实现最大 BET 比表面积（10.42 m(2)/g）、蜂窝状孔分布和对 Cr(VI)和 RB 的吸附。pH 值和温度实验表明，它们对所用吸附剂的吸附能力有相当大的影响。当溶液中存在其他离子（Na(+)、Ca(2+)和 NH(4)(+)）时，它们会显著降低金属的摄取量，但当存在 Na(+)和 NH(4)(+)离子时，染料的去除量略有增加。平衡数据与 Langmuir 模型拟合良好，在 30-50°C 时，Cr(VI)和 RB 的单层吸附容量分别为 177-217 和 213-250 mg/g。吸附动力学符合准二级动力学模型。吸附容量随着温度的升高而增加，这表明吸附是吸热的。结果表明，HCl 改性的 TRB（A-TRB）可作为一种低成本的吸附剂，用于去除水溶液中的 Cr(VI)和 RB，包括工业废水。
