Versatile Surface Modification of Ceramsite Via Honeycomb Calcium-aluminum-silicate-hydrate and Its Functionalization by 3-thiocyanatopropyltriethoxysilane for Enhanced Cadmium（Ⅱ） Removal
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2020年第1期
论文作者：赵都 刘鹏 WANG Fazhou HU Chuanlin HU Shuguang
文章页码：71 - 80
摘 要：A low-cost and efficient filter medium for Cd（Ⅱ） removal was prepared by anchoring-SCN functional groups（by 3-thiocyanatopropyltriethoxysilane, TCPS） on ceramsite via the approach of synthesizing a honeycomb calciumaluminum-silicate-hydrate（C-A-S-H） layer as intermediate. The specific surface area of ceramsite was increased enormously by more than 50 times because of the modification of honeycomb layer. Moreover, the abundant Si-OH bonds existing in the structure of CAS-H can serve as active sites for TCPS. The combined effects ensure that the hybrid filter medium（named ceramsite/C-A-S-H/TCPS） demonstrated a high Cd（Ⅱ） adsorption capacity of 18.27 mg·g1 for particle size of 0.1-0.6 mm, 12.63 mg·g-1 for 0.6-1.25 mm and 8.64 mg g-1 for 1.25-2.35 mm. The Cd（Ⅱ） adsorption capacity per unit area of ceramsite/C-A-S-H/TCPS（0.1-0.6 mm） is up to 4.07 mg·m-2, which is much higher than that of many nano-adsorbents. In addition, ceramsite/C-AS-H/TCPS could maintain a high removal efficiency（> 85%） in a wide range of p H 3-11 and showed excellent selectivity in the presence of competing ions. Furthermore, Cd（Ⅱ） could be desorbed from ceramsite/C-A-S-H/TCPS composites with nearly 100%, suggesting the potential application in recycling of heavy metal ions.
赵都1，刘鹏1,2，WANG Fazhou1，HU Chuanlin1，HU Shuguang1
1. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology2. School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology
摘 要：A low-cost and efficient filter medium for Cd（Ⅱ） removal was prepared by anchoring-SCN functional groups（by 3-thiocyanatopropyltriethoxysilane, TCPS） on ceramsite via the approach of synthesizing a honeycomb calciumaluminum-silicate-hydrate（C-A-S-H） layer as intermediate. The specific surface area of ceramsite was increased enormously by more than 50 times because of the modification of honeycomb layer. Moreover, the abundant Si-OH bonds existing in the structure of CAS-H can serve as active sites for TCPS. The combined effects ensure that the hybrid filter medium（named ceramsite/C-A-S-H/TCPS） demonstrated a high Cd（Ⅱ） adsorption capacity of 18.27 mg·g1 for particle size of 0.1-0.6 mm, 12.63 mg·g-1 for 0.6-1.25 mm and 8.64 mg g-1 for 1.25-2.35 mm. The Cd（Ⅱ） adsorption capacity per unit area of ceramsite/C-A-S-H/TCPS（0.1-0.6 mm） is up to 4.07 mg·m-2, which is much higher than that of many nano-adsorbents. In addition, ceramsite/C-AS-H/TCPS could maintain a high removal efficiency（> 85%） in a wide range of p H 3-11 and showed excellent selectivity in the presence of competing ions. Furthermore, Cd（Ⅱ） could be desorbed from ceramsite/C-A-S-H/TCPS composites with nearly 100%, suggesting the potential application in recycling of heavy metal ions.
关键词：
