Athanasiadis Konstantinos, Helmreich Brigitte
Institute of Water Quality Control and Waste Management, Technical University of Munich, Am Coulombwall, 85748 Garching, Germany.
Water Res. 2005 Apr;39(8):1527-32. doi: 10.1016/j.watres.2005.01.024. Epub 2005 Mar 17.
Aim of this study was to evaluate the feasibility of the use of clinoptilolite as a barrier material to eliminate heavy metals from roof runoff. The effect of chemical conditioning with 1 M NaCl solution upon the ion exchange capacity and on kinetic of zinc uptake by clinoptilolite has been investigated. According to the batch experiments the modified clinoptilolite has up to 100% higher sorption capacity, regarding Zn than the natural material. The pre-treatment of clinoptilolite results in an acceleration of the ion exchange process up to 40% regarding zinc. In order to define the reasons of this behaviour, both materials, modified and natural, were analysed for: (i) chemical composition, (ii) density, (iii) pore size distribution and (iv) zeta potential. The clogging of the pores, the charge of the grain surface, the pH of the initial metal solution and the ion metal concentration are the factors which are mainly affecting the ion exchange capacity and the rate of zinc uptake by clinoptilolite.
本研究的目的是评估使用斜发沸石作为屏障材料去除屋顶径流中重金属的可行性。研究了用1M NaCl溶液进行化学处理对斜发沸石离子交换容量和锌吸收动力学的影响。根据批量实验，改性斜发沸石对锌的吸附容量比天然材料高出100%。斜发沸石的预处理使锌的离子交换过程加速了40%。为了确定这种行为的原因，对改性和天然两种材料进行了以下分析：(i)化学成分，(ii)密度，(iii)孔径分布和(iv)zeta电位。孔隙堵塞、颗粒表面电荷、初始金属溶液的pH值和离子金属浓度是主要影响斜发沸石离子交换容量和锌吸收速率的因素。
