title: [Removal of Sulfate Ions from Aqueous Solution by Adsorption with Hydrotalcite- like Composite].
abstract: Hydrotalcite-like composite synthesized by co-precipitation method was used as an adsorbent to remove the sulfate ions in aqueous solution. XRD, FT-IR , SEM and EDS elemental analysis were used to clarify the structure and composition of the hydrotalcite- like composite. The influences of time, initial pH value and coexisting ions on adsorption performance were investigated. The result showed the material was the composite of zinc aluminum nitrate hydrotalcite-like compounds and zinc aluminum phenylalanine hydrotalcite-like compounds. Hydrotalcite-like composite had a good performance in adsorption of sulfate ions, and the maximum adsorption capacity was 52.75 mg · g⁻¹. The data fitted pseudo-second order kinetic model best, which indicated that chemical adsorption was the rate-limiting step. Freundlich isotherm was more suitable to describe the adsorption process, and this meant the adsorption of sulfate ions by hydrotalcite-like composite was multilayered adsorption. Thermodynamic parameters showed that the adsorption process was endothermic and spontaneous at room temperature. Hydrotalcite-like composite adsorbed sulfate ions mainly through ion exchange, electrostatic force and physical adsorption. The experimental results showed that the hydrotalcite-like composite had potential for sulfate ion removal in the aqueous solution.
authors.forename: Yi-bing
authors.initials: YB
authors.lastname: Gu
authors.forename: Yong-wen
authors.initials: YW
authors.lastname: Ma
authors.forename: Jin-quan
authors.initials: JQ
authors.lastname: Wan
authors.forename: Yan
authors.initials: Y
authors.lastname: Wang
authors.forename: Ze-yu
authors.initials: ZY
authors.lastname: Guan
mesh_terms: D000327:Adsorption; D017607:Aluminum Compounds / Q000737:chemistry; D000536:Aluminum Hydroxide / Q000737:chemistry*; D007700:Kinetics; D008276:Magnesium Hydroxide / Q000737:chemistry*; D009566:Nitrates / Q000737:chemistry; D013431:Sulfates / Q000737:chemistry*; D013816:Thermodynamics; D017967:Zinc Compounds / Q000737:chemistry
chemical_list: D017607:Aluminum Compounds; D009566:Nitrates; D013431:Sulfates; D017967:Zinc Compounds; C010467:hydrotalcite; D000536:Aluminum Hydroxide; C042103:zinc nitrate; C050609:aluminum nitrate; D008276:Magnesium Hydroxide