“微超酸”改性硅藻土对Pb~(2+),Cu~(2+),Cd~(2+)的吸附性能研究

以天然硅藻土为原料,通过微波、超声、酸化制备得到"微超酸"改性硅藻土.探讨了该改性硅藻土对水溶液中Pb~(2+)、Cu~(2+)、Cd~(2+)3种重金属离子的吸附效果及影响因素.实验结果表明,在一定范围内,提高溶液pH值、延长吸附时间、升高吸附温度、增加吸附剂的用量均可提高3种金属离子的吸附去除效果;"微超酸"改性硅藻土对3种金属离子的等温吸附符合Langmuir方程.

On Absorption of Pb2+, Cu2+, Cd2+ ions by Modified Diatomite

In this assay, the modified diatomite is prepared via processes of microwave, ultrasound, and acid treatments to natural diatomite. Meanwhile, those key experimental parameters are optimized to achieve high-efficacy absorption of Pb²⁺, Cu²⁺, Cd²⁺ in aqueous phases on modified diatomite. The experimental results indicate that, with the increase of pH value, absorption time, temperature and quantity of sorbent, the effects on the absorption of Pb²⁺, Cu²⁺, Cd²⁺ were improved. Moreover, the models of isothermal absorption of Pb²⁺, Cu²⁺, Cd²⁺ ions are demonstrated according to Langmuir equations.