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针对甘肃平凉钙基膨润土,以十六烷基氯化吡啶(CPC)和十二烷基磺酸钠(SDS)进行改性,研究了原土及其改性土对亚甲基蓝溶液的吸附特性,并从热力学和动力学角度探讨了吸附作用机理。结果表明,改性前后的膨润土对亚甲基蓝吸附能力大小为:SDS-B t>B t>SDS-CPC-B t>CPC-B t,其吸附动力学行为均符合伪二级动力学方程,吸附活化能较小。在298~353 K范围内,吸附反应为自发过程,表现为物理吸附,且亚甲基蓝在SDS-B t、B t和SDS-CPC-B t上的吸附符合Langmuir等温方程,在CPC-B t上的吸附则符合Tempkin等温方程。
Aiming at the calcium-based bentonite in Pingliang, Gansu, the adsorption properties of methylene blue solution on native soil and its modified soil were studied by cetyl pyridinium chloride (CPC) and sodium dodecyl sulfate (SDS) The mechanism of adsorption was discussed from thermodynamics and kinetics. The results showed that the adsorption capacities of bentonite before and after modification on methylene blue were as follows: SDS-B t> B t> SDS-CPC-B t> CPC-B t. Less activation energy. In the range of 298-353 K, the adsorption reaction was spontaneous and showed physical adsorption. The adsorption of methylene blue on SDS-B t, B t and SDS-CPC-B t conformed to the Langmuir isotherm equation, and on CPC-B t The adsorption is in accordance with the Tempkin isotherm equation.