Abstract

A novel adsorbent, called dithiocarboxyl cornstalk (DTCS), was developed, and the effects of various parameters on the adsorption performance for Cd(II) with DTCS were investigated in this work. The results suggested that DTCS presented the efficient removal capacity for Cd(II) when the pH values, adsorption temperature, and oscillation rate were 3.0 to 6.0, 313 K, and 150 rpm, respectively. The adsorption kinetic data were more agreed with pseudo-second-order kinetic model, and the isotherm data could be characterized by Freundlich model. The thermodynamic data indicated the adsorption process was endothermic and spontaneous. The FTIR and SEM confirmed the chemisorption between Cd(II) and DTCS. Furthermore, to eliminate the secondary pollution, the waste filtrate generated in the preparation of DTCS was employed to remove Cd(II) through flocculation experiments. The results showed that the waste filtrate is a potential flocculant for the treatment of wastewater containing Cd(II).

摘要

研制了一种新型的吸附剂二硫代羧基玉米秸秆（DTCS），并研究了各种参数对DTCS对Cd（II）的吸附性能的影响。结果表明，当pH值，吸附温度和振荡速率分别为3.0至6.0、313 K和150 rpm时，DTCS可以有效去除Cd（II）。吸附动力学数据更符合拟二阶动力学模型，等温线数据可用Freundlich模型表征。热力学数据表明吸附过程是吸热的和自发的。FTIR和SEM证实了Cd（II）和DTCS之间的化学吸附。此外，为了消除二次污染，DTCS制备过程中产生的废滤液通过絮凝实验去除了Cd（II）。结果表明，废滤液是一种潜在的絮凝剂，用于处理含Cd（II）的废水。