利用蒸汽加压混凝土废料去除废水中的Cd(II)
Removal of Cd(II) from Wastewater by Autoclaved Aerated Concrete Waste

蒸汽加压混凝土废料（AACW）是一种建材工业的废弃物，主要成分中含钙、铝、铁的氧化物，同时由于材料经过发泡具有较大的比表面积.本文以该废料研磨加工的粉末作为吸附剂，研究了废料对中3mg/L含Cd2+废水的去除效果.通过XRF，SEM，XRD手段探究了AACW的结构和性能，并研究了该材料在不同反应条件下对低浓度Cd2+的吸附性能.结果表明，当投加量为10 g/L，吸附时间为90 min时，Cd2+的去除率可达到97%.吸附反应符合Langmuir方程和拟二级动力学方程，且吸附过程中同时存在着物理吸附和化学吸附的机理.此外，AACW对工业污水中Cu 2+、 Pb2+和Zn2+等其它重金属离子表现出广泛的去除效果. 从建筑行业回收的AACW可以作为一种有应用前景的低成本吸附剂去除水溶液中的有毒重金属.
： The removal efficiency and mechanism of Cd2+ in wastewater were studied by using the powder of autoclaved aerated concrete (AAC) waste. The structure and physical properties of AAC were characterized by XRF, SEM, XRD and its adsorption properties for removal of 3 mg/L Cd2+ under different conditions were investigated. The results showed that the removal rate of AAC for Cd2+ has attained 97% after 90 min when the initial dosage of AAC was 10 g/L. The adsorption process fitted to Langmuir model and pseudo-second-order kinetic model. Physical adsorption and chemisorption were both observed during the process. Besides, AAC possesses comprehensive removal effect for other heavy metal ions include Cu2+, Pb2+ and Zn2+ in industrial wastewater. AAC of the construction industry can effectively remove the toxic heavy metal ions in the aqueous solution and is a low cost and promising water purifying agent