Effect of isomorphic replacement of palygorskite on its heavy metal adsorption performance
Source abstract
Abstract
Isomorphism is a common phenomenon in clay minerals, which is one of the main reasons for the change of mineral chemical composition and physical and chemical properties. In this study, four kinds of palygorskite with different degrees of isomorphic replacement of octahedral cations were selected. The microstructure and surface-interface properties of different Mg2+/Al3+ palygorskite were analyzed by X-ray diffraction, infrared spectroscopy, N2 adsorption-desorption method, X-ray fluorescence spectroscopy and other characterization methods, and the effects of isomorphic replacement on microstructure such as Mg content and surface-interface properties such as hydroxyl concentration and acid content were discussed. Taking Cu2+ as the target pollutant, the adsorption capacity of different palygorskite to Cu2+ was measured and discussed. Combining the surface hydroxyl concentration and acid amount of palygorskite, as well as the concentration, time and temperature of the reaction system, the rule of adsorption of the four palygorskite for Cu2+ was Mg-rich palygorskite (a-ATP) > palygorskite with equal Mg and Al (c-ATP) > Al-rich palygorskite (d-ATP) > palygorskite with the most Mg (b-ATP), demonstrating that when Mg was partially replaced by Al, palygorskite contained appropriate hydroxyl concentration and acid amount, resulting in the best adsorption effect for Cu2+ (29.2 mg/g). It is of great significance for resource utilization of palygorskite to reveal the regularity of heavy metal adsorption by isomorphic replacement of palygorskite.
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Research context
OpenAlex topics: Clay minerals and soil interactions · Soil and Unsaturated Flow · Iron oxide chemistry and applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Materials Science and Engineering, Shenyang Jianzhu University 1 , Shenyang 110168, China
School of Mechanical Engineering, Shenyang Jianzhu University 2 , Shenyang 110168, China
Funding
National Natural Science Foundation of China · Liaoning Province “Xingliao talent plan project” · Department of Education of Liaoning Province · Key Laboratory of Clay Mineral Applied Research of Gansu Province · Natural Science Foundation of Liaoning Province
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