title: Methylene blue adsorption on graphene oxide/calcium alginate composites.
abstract: Graphene 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.
authors.affiliation: Laboratory of Fiber Materials and Modern Textile, the Growing Base for State Key Laboratory, College of Electromechanical Engineering, Qingdao University, 308 Ningxia Road, Qingdao 266071, PR China. liyanhui@tsinghua.org.cn
authors.forename: Yanhui
authors.initials: Y
authors.lastname: Li
authors.forename: Qiuju
authors.initials: Q
authors.lastname: Du
authors.forename: Tonghao
authors.initials: T
authors.lastname: Liu
authors.forename: Jiankun
authors.initials: J
authors.lastname: Sun
authors.forename: Yonghao
authors.initials: Y
authors.lastname: Wang
authors.forename: Shaoling
authors.initials: S
authors.lastname: Wu
authors.forename: Zonghua
authors.initials: Z
authors.lastname: Wang
authors.forename: Yanzhi
authors.initials: Y
authors.lastname: Xia
authors.forename: Linhua
authors.initials: L
authors.lastname: Xia
mesh_terms: D000327:Adsorption; D000464:Alginates / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry*; D020723:Glucuronic Acid / Q000737:chemistry; D006108:Graphite / Q000737:chemistry*; D006603:Hexuronic Acids / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D008751:Methylene Blue / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D013816:Thermodynamics; D014865:Waste Disposal, Fluid / Q000379:methods; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D000464:Alginates; D004396:Coloring Agents; D006603:Hexuronic Acids; D014874:Water Pollutants, Chemical; D006108:Graphite; D020723:Glucuronic Acid; D008751:Methylene Blue