Cd2;+-Adsorption Properties in Wastewater of Composite Modified Maifan Stone

摘要

A new kind of Cd2+adsorption material was prepared using maifan stone by composite modification with chemical and heat treatment methods. The modified maifan stones were characterized by SEM and EDS. Effects of the modified maifan stone content, contact time and the initial pH of the solution on the adsorption of Cd2+ were studied. The research results show as follows: 1) The composite modified maifan stone was prepared with heat treatment for 1 h at 340 °C after the chemical dipping for 24 h with 2 mol/L CaCl2 solutions; 2) The composite modified maifan stone had even more obvious poor porosity holes and more contact area for ion exchange and adsorption of Cd2+; 3)In the condition of the initial Cd2+ concentration=50 mg/L, the maifan stone content=50 g/L, the contact time=40 min and pH=8, the adsorption of Cd2+ was up to 87.6 %.