关键词: 红磷, 磷化镍, 水热合成, 重金属吸附

Abstract:

Ni12P5 and Ni2P were controllably prepared by thermal synthesis using non-toxic red phosphorus instead of white phosphorus, and nickel nitrate at initial mole ratio of Ni/P. The adsorption capacities for Pb2+ and Cd2+ of the phosphides obtained were tested. The results show that at synthesis conditions of 120 ℃ and 12 h, the phase structure of the phosphide is transformed from the tetragonal Ni12P5 to the hexagonal Ni2P with increasing the initial P/Ni mole ratio. The later has a higher heavy metal adsorption capacity. The removal rate of Ni12P5 for Pb2+ and Cd2+ in solution are 83.13% and 52.59%, respectively. While for Ni2P, the removal rate reaches 89.33% and 56.57%, respectively.

Key words: red phosporus, nickel phosphide, hydrothermal synthesis, heavy metal adsorption