Department of Chemistry and Biochemistry, Mendel University in Brno, Zemedelska 1, CZ-61300 Brno, Czech Republic.
Central European Institute of Technology, Brno University of Technology, Purkyňova 656/123, CZ-61200 Brno, Czech Republic.
Molecules. 2019 Mar 18;24(6):1063. doi: 10.3390/molecules24061063.
The removal of selenium from superficial and waste water is a worldwide problem. The maximum limit according to the World Health Organization (WHO) for the selenium in the water is set at a concentration of 10 μg/L. Carbon based adsorbents have attracted much attention and recently demonstrated promising performance in removal of selenium. In this work, several materials (iron oxide based microparticles and graphene oxides materials) and their composites were prepared to remove Se(IV) from water. The graphene oxides were prepared according to the simplified Hummer's method. In addition, the effect of pH, contact time and initial Se(IV) concentration was tested. An electrochemical method such as the differential pulse cathodic stripping voltammetry was used to determine the residual selenium concentration. From the experimental data, Langmuir adsorption model was used to calculate the maximum adsorption capacity. Graphene oxide particles modified by iron oxide based microparticles was the most promising material for the removal of Se(IV) from its aqueous solution at pH 2.0. Its adsorption efficiency reached more than 90% for a solution with given Se(IV) concentration, meanwhile its maximal recorded adsorption capacity was 18.69 mg/g.
从地表水和废水中去除硒是一个全球性的问题。世界卫生组织（WHO）规定水中硒的最高限量为 10μg/L。基于碳的吸附剂引起了广泛关注，最近在去除硒方面表现出了良好的性能。在这项工作中，制备了几种材料（氧化铁基微颗粒和氧化石墨烯材料）及其复合材料，以从水中去除硒（IV）。氧化石墨烯是根据简化的 Hummer 法制备的。此外，还测试了 pH 值、接触时间和初始硒（IV）浓度的影响。采用差分脉冲阴极溶出伏安法等电化学方法来测定残留硒的浓度。根据实验数据，采用朗缪尔吸附模型计算最大吸附容量。在 pH 值为 2.0 时，氧化铁基微颗粒修饰的氧化石墨烯颗粒是从水溶液中去除硒（IV）最有前途的材料。对于给定浓度的硒（IV）溶液，其吸附效率达到 90%以上，同时记录到的最大吸附容量为 18.69mg/g。
