title: A new approach for rhenium(VII) recovery by using modified brown algae Laminaria japonica adsorbent.
abstract: Brown algae Laminaria japonica was chemically modified with sulfuric acid to obtain a crosslinked brown algae gel (CAS). The CAS gel showed a high affinity for Re(VII) comparing with other biomass gels, and the maximum adsorption capacity was evaluated as 37.20 mg g(-1) in case of pH 6, which could be explained by their different adsorption mechanisms. The adsorption equilibrium, kinetics and thermodynamic study for Re(VII) on the CAS gel was discussed in detail by the several models, such as Langmuir, Freundlich, Temkin and Dubinin-Radushkevich model for kinetics analysis, the pseudo first, the second-order, the Elovich and intraparticle diffusion equation for equilibrium analysis. Reutilization of the CAS gel was confirmed up to three adsorption-elution cycles in column-mode operation with no damage of gel, packed in the column. The result also provides a new approach for the recovery of Re(VII) from Re-containing wastewater by using the modified brown algae gel.
authors.affiliation: College of Chemistry, Key Laboratory of Rare-scattered Elements of Liaoning Province, Liaoning University, Shenyang 110036, PR China. xiongying_1977@hotmail.com
authors.forename: Ying
authors.initials: Y
authors.lastname: Xiong
authors.forename: Jia
authors.initials: J
authors.lastname: Xu
authors.forename: Weijun
authors.initials: W
authors.lastname: Shan
authors.forename: Zhenning
authors.initials: Z
authors.lastname: Lou
authors.forename: Dawei
authors.initials: D
authors.lastname: Fang
authors.forename: Shuliang
authors.initials: S
authors.lastname: Zang
authors.forename: Guangxi
authors.initials: G
authors.lastname: Han
mesh_terms: D000327:Adsorption; D005782:Gels; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D007795:Laminaria / Q000378:metabolism*; D008956:Models, Chemical; D015394:Molecular Structure; D012211:Rhenium / Q000737:chemistry / Q000302:isolation & purification* / Q000378:metabolism; D017550:Spectroscopy, Fourier Transform Infrared; D013816:Thermodynamics; D062065:Wastewater / Q000032:analysis*; D018508:Water Purification / Q000379:methods*
chemical_list: D005782:Gels; D012211:Rhenium; D062065:Wastewater