The adsorptive removal of Cr(VI) and methylene blue (MB) was studied in a batch reactor using activated carbon (RAC), prepared from natural rubber waste, along with the commercial activated carbon (CAC). Maximum uptake of Cr(VI) and MB by the RAC was 21 and 30 mg g⁻¹, respectively, whereas the corresponding uptake by CAC was 145 and 224 mg g⁻¹. The kinetics of adsorption, however, was found to be faster in RAC than CAC. Both adsorbents were characterized by XRD, FT-IR, and FESEM-EDS. The predictability of various kinetic models, including the Weber-Morris model, was adversely affected by linearization. A multi-linear plot of adsorbed concentration versus square root of time failed to justify the multi-resistance hypothesis of mass transfer. Experimental kinetic data matched well with four surface reactions and an intraparticle diffusion model but showed substantial deviation from the numerical solution of another Fickian model incorporating mass balance and Langmuir isotherm.

使用由天然橡胶废料制备的活性炭 (RAC) 和商业活性炭 (CAC) 在间歇式反应器中研究吸附去除 Cr(VI) 和亚甲蓝 (MB)。RAC 对 Cr(VI) 和 MB 的最大吸收分别为 21 和 30 mg g ^-1，而 CAC 的相应吸收为 145 和 224 mg g ^-1. 然而，发现 RAC 中的吸附动力学比 CAC 更快。两种吸附剂均通过 XRD、FT-IR 和 FESEM-EDS 进行表征。各种动力学模型（包括 Weber-Morris 模型）的可预测性受到线性化的不利影响。吸附浓度与时间平方根的多重线性图未能证明传质的多阻力假设是正确的。实验动力学数据与四个表面反应和粒子内扩散模型非常匹配，但与另一个包含质量平衡和朗缪尔等温线的 Fickian 模型的数值解有很大偏差。