Abstract: Using diatomite as natural silicon source,and CTAB as template,mesoporous diatomite(DM) and magnetic mesoporous diatomite(MDM) have been prepared,and the prepared products characterized by means of SEM FTIR and STA. Taking Cd²⁺ as target pollutant,the adsorption capabilities of two kinds of adsorbing materials for Cd²⁺ have been investigated. The results show that when the initial Cd²⁺ mass concentration is 10 mg/L,temperature 25℃, pH 6,dosages of DM and MDM are both 3 g/L,and reaction time lasts for 30 min,the removing rates of DM and MDM for Cd²⁺ are 85.67% and 98.75%,respectively. Both of them have good adsorption effect on Cd²⁺ and can be reused 5 times. The behavior of DM and MDM adsorption for Cd²⁺ complies with Freundlich and Langmuir isotherm models, respectively,and both of the adsorption processes complies with pseudo-second-order kinetics equation.

Key words: mesoporous diatomite, magnetic mesoporous diatomite, wastewater containing Cd²⁺, adsorption

摘要： 以硅藻土为天然硅源，CTAB为模板剂制得介孔硅藻（DM）和磁性介孔硅藻（MDM）。采用SEM、FTIR和STA对制备的产品进行了表征，并以Cd²⁺为目标污染物，研究了2种吸附材料对Cd²⁺的吸附性能。结果表明，当初始Cd²⁺质量浓度为10 mg/L，温度为25℃，pH=6，DM和MDM投加量为3 g/L，吸附时间为30 min时，DM和MDM对Cd²⁺的去除率分别为85.67%和98.75%，且均可再生使用5次。DM和MDM对Cd²⁺的吸附分别符合Freundlich和Langmuir等温吸附模型，吸附过程均符合准二级动力学方程。

关键词: 介孔硅藻, 磁性介孔硅藻, 含Cd²⁺废水, 吸附

CLC Number: 

• X703.1