Zeolite is a natural porous material with adsorption properties and is widely used in environmental remediation. In this study, different ratios of manganese-modified zeolites (x% Mn-NZ, x = 1,2,5,10) were prepared by chemical precipitation method for the adsorption and transformation of low concentrations of Cr(Ⅵ) in water. The adsorption performance of manganese-modified zeolites for Cr(Ⅵ) was compared for simulated surface water with an initial chromium concentration of 0.5 mg/L under ambient conditions. The experiments showed that when the dosage of manganese-modified zeolite was 20 mg/L, the removal rate of Cr(Ⅵ) by 5% Mn-NZ reached 80.40%, and the concentration of Cr(Ⅵ) in the solution was reduced to below the national standard limit. The kinetic analysis showed that the adsorption of Cr(Ⅵ) by the manganese-modified zeolite was more in line with the quasi-secondary kinetic model (R2 > 0.99), indicating that the adsorption process was dominated by chemical adsorption, and the equilibrium adsorption amount was 23.81 mg/g. By systematically evaluating the effects of pH and coexisting ions on the performance of manganese-loaded zeolites for the adsorption of Cr(Ⅵ), the results showed that the adsorption of Cr(Ⅵ) by 5% Mn-NZ remained optimal in the range of pH 6 to 9, and in the case of coexisted ions, both of them remained optimal in the pH range. It was found that 5% Mn-NZ maintained the optimum adsorption performance in the pH range of 6 to 9 and in the presence of coexisting ions. The main mechanism of Cr(Ⅵ) adsorption by Mn-modified zeolite was revealed by XPS and FT-IR analyses, in which Mn2+ and Mn3+ on the surface provided electrons to reduce Cr(Ⅵ) to Cr(Ⅲ). This study provides technical support for metal-modified zeolite to remove low concentration of Cr(Ⅵ) pollution in water bodies.
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