Modification of Deoiled Diatomite and Its Adsorption Performance for Methyl Violet

doi:10.15541/jim20260056

Abstract

Abstract: Oily diatomite is generated during the filtration of rolling oil using diatomite in the aluminum rolling process. Thermal desorption technology is utilized to recover oil and deoiled diatomite is produced. To reduce landfill and mitigate secondary environmental pollution, resource utilization of deoiled diatomite is essential. In this study, two modification methods were adopted and changes in functional groups, surface element valences, pore structure, and microstructure were analyzed. Adsorption experiments of methyl violet (MV) from simulated dye wastewater were conducted using the modified deoiled diatomite. Adsorption kinetics and thermodynamics were investigated, and the adsorption mechanism was discussed. By comparison with pristine diatomite, the feasibility of preparing diatomite filter aid from deoiled diatomite and its application in the dye wastewater treatment were explored. The results indicated that the optimal calcination temperature was 900 ℃, and the prepared material exhibited a high permeability and SiO₂ content meeting the Grade I diatomite filter aid. Compared with the calcined deoiled diatomite, the iron-modified deoiled diatomite exhibited increased crystallinity, enhanced lattice oxygen content, elevated surface Si-OH content and Fe³⁺/Fe²⁺ ratio, and increased specific surface area. It achieved a removal rate of 82.11% for MV after seven cycles, significantly higher than 58.34% for the calcined counterpart. The enhanced adsorption performance is primarily attributed to the introduction of new surface active sites, micropore filling, and the creation of additional pore structures after iron loading.

Key words: deoiled diatomite, modification, dye wastewater, adsorption, recycling

CLC Number:

TB321
O647

CUI Mengmeng, LI Xiaoyan. Modification of Deoiled Diatomite and Its Adsorption Performance for Methyl Violet[J]. Journal of Inorganic Materials, DOI: 10.15541/jim20260056.

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