Kostić Miloš, Đorđević Miloš, Mitrović Jelena, Velinov Nena, Bojić Danijela, Antonijević Milan, Bojić Aleksandar
Department of Chemistry, Faculty of Science and Mathematics, University of Niš, Višegradska 33, 18000 Nis, Serbia.
Faculty of Engineering and Science, University of Greenwich, Chatham Maritime, Kent, ME4 4TB, UK.
Environ Sci Pollut Res Int. 2017 Jul;24(21):17790-17804. doi: 10.1007/s11356-017-9419-1. Epub 2017 Jun 11.
The removal of Cr(III) ions and methylene blue (MB) from aqueous solutions by xanthated corn cob (xCC) in batch conditions was investigated. The sorption capacity of xCC strongly depended of the pH, and increase when the pH rises. The kinetics was well fitted by pseudo-second-order and Chrastil's model. Sorption of Cr(III) ions and MB on xCC was rapid during the first 20 min of contact time and, thereafter, the biosorption rate decrease gradually until reaching equilibrium. The maximum sorption capacity of 17.13 and 83.89 mg g for Cr(III) ions and MB, respectively, was obtained at 40 °C, pH 5, and sorbent dose 4 g dm for removal of Cr(III) ions and 1 g dm for removal of MB. The prediction of purification process was successfully carried out, and the verification of theoretically calculated amounts of sorbent was confirmed by using packed-bed column laboratory system with recirculation of the aqueous phase. The wastewater from chrome plating industry was successfully purified, i.e., after 40 min concentration of Cr(III) ions was decreased lower than 0.1 mg dm. Also, removal of MB from the river water was successfully carried out and after 40 min, removal efficiency was about 94%.
研究了在间歇条件下，黄原酸化玉米芯（xCC）对水溶液中Cr(III)离子和亚甲基蓝（MB）的去除情况。xCC的吸附容量强烈依赖于pH值，且随pH升高而增加。动力学符合准二级动力学和Chrastil模型。Cr(III)离子和MB在xCC上的吸附在接触时间的前20分钟内迅速进行，此后，生物吸附速率逐渐降低直至达到平衡。在40°C、pH为5、吸附剂剂量为4 g dm用于去除Cr(III)离子和1 g dm用于去除MB的条件下，Cr(III)离子和MB的最大吸附容量分别为17.13和83.89 mg g。成功进行了净化过程的预测，并通过使用水相循环的填充床柱实验室系统对理论计算的吸附剂用量进行了验证。镀铬工业废水成功得到净化，即40分钟后Cr(III)离子浓度降至低于0.1 mg dm。此外，也成功从河水中去除了MB，40分钟后去除效率约为94%。
