Methylene blue adsorption on graphene oxide/calcium alginate composites
2013; Elsevier BV; Volume: 95; Issue: 1 Linguagem: Inglês
10.1016/j.carbpol.2013.01.094
ISSN1879-1344
AutoresYanhui Li, Qiuju Du, Tonghao Liu, Jiankun Sun, Yonghao Wang, Shao-Ling Wu, Zonghua Wang, Yanzhi Xia, Linhua Xia,
Tópico(s)Nanomaterials for catalytic reactions
ResumoGraphene oxide has been used as an adsorbent in wastewater treatment. However, the dispersibility in aqueous solution and the biotoxicity to human cells of graphene oxide limits its practical application in environmental protection. In this research, a novel environmental friendly adsorbent, calcium alginate immobilized graphene oxide composites was prepared. The effects of pH, contact time, temperature and dosage on the adsorption properties of methylene blue onto calcium alginate immobilized graphene oxide composites were investigated. The equilibrium adsorption data were described by the Langmuir and Freundlich isotherms. The maximum adsorption capacity obtained from Langmuir isotherm equation was 181.81 mg/g. The pseudo-first order, pseudo-second order, and intraparticle diffusion equation were used to evaluate the kinetic data. Thermodynamic analysis of equilibriums indicated that the adsorption reaction of methylene blue onto calcium alginate immobilized graphene oxide composites was exothermic and spontaneous in nature.
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