Center for Advanced Materials and Industrial Chemistry (CAMIC), School of Science, RMIT University, Victoria, 3001, Australia; Chemical and Environmental Engineering, School of Engineering, RMIT University, Victoria, 3001, Australia; Department of Chemical Engineering, M V J College of Engineering, Near ITPB Whitefield, Kadugodi, Bengaluru, Karnataka, 560067. India.
Center for Advanced Materials and Industrial Chemistry (CAMIC), School of Science, RMIT University, Victoria, 3001, Australia.
Chemosphere. 2019 Dec;237:124488. doi: 10.1016/j.chemosphere.2019.124488. Epub 2019 Jul 30.
The adsorptive capability of rice-husk for the sorption of thorium ions from aqueous solutions in batch mode was studied. The key process variables (initial metal ion concentration, initial solution pH and S/L (solid-to-liquid ratio) were optimized for achieving maximum bioremoval efficiency (B%) by employing the Box-Behnken design (33) in response surface methodology (RSM). A quadratic model developed by fitting the experimental data predicted 93% of the responses and estimated the local maximum of B% as >99% for an initial ThIV concentration of 150 g/L, S/L ratio of 5, and an initial pH of 4, and the reported biosorption capacity (qe) is 15.95 mg/g for the same conditions. Freundlich isotherm (R = 0.9841) and pseudo-first-order (R = 0.9416) kinetic models had the best concurrence with the experimental data in the thorium concentration range used implying the sorption mechanism involves surface biosorption and intraparticle diffusion.
采用 Box-Behnken 设计（33）在响应面法（RSM）中优化了关键工艺变量（初始金属离子浓度、初始溶液 pH 值和固液比（S/L）），以实现最大生物去除效率（B%），研究了稻壳在批处理模式下从水溶液中吸附钍离子的吸附能力。通过拟合实验数据开发的二次模型预测了 93%的响应，并估计在初始 ThIV 浓度为 150 g/L、S/L 比为 5 和初始 pH 值为 4 的情况下，B%的局部最大值>99%，在相同条件下报道的生物吸附容量（qe）为 15.95 mg/g。在所用的钍浓度范围内，Freundlich 等温线（R = 0.9841）和拟一级动力学（R = 0.9416）模型与实验数据具有最佳一致性，表明吸附机制涉及表面生物吸附和颗粒内扩散。
