title: Biosorption of U(VI) by modified Hottentot Fern: Kinetics and equilibrium studies.
abstract: Batch experiments were conducted to investigate the biosorption of U(VI) onto Hottentot Fern (Cyclosorus interruptus). The selective adsorption, the adsorption of different sections of Cyclosorus interruptus (CI), and the adsorption of polluted CI compared with that of unpolluted one were studied in detail. The raw CI and the CI modified by CaCl2, MgCl2, MgCl2/H2O2were investigated for adsorption of U(VI) from aqueous solution. The results indicate that raw CI showed good adsorption selectivity for U(VI), compared with the adsorption of Cu(II), Co(II) and Ni(II). The stem of CI possesses a prominent adsorption capacity compared to the leaf and root of CI, and the unpolluted CI showed its superiority in adsorption capacity than the polluted CI. Adsorption rate was very fast during the first 30 min in the whole adsorption process. The pseudo-second-order kinetics model was proposed for the adsorption of U(VI) and the equilibrium data fitted well to Langmuir adsorption isotherms. The maximum adsorption capacity of R-CI, Ca-CI, Mg-CI and Mg/H2O2-CI is 41.67, 52.63, 62.50 and 71.43 mg g-1at 20 °C, respectively.
authors.affiliation: School of Chemistry and Chemical Engineering, Central South University, Lushan South Road 932, Changsha, Hunan, 410083, China.
authors.forename: Ke
authors.initials: K
authors.lastname: Zhou
authors.affiliation: School of Chemistry and Chemical Engineering, Central South University, Lushan South Road 932, Changsha, Hunan, 410083, China. Electronic address: liuyaochi72@163.com.
authors.forename: Yaochi
authors.initials: Y
authors.lastname: Liu
authors.affiliation: School of Chemistry and Chemical Engineering, Central South University, Lushan South Road 932, Changsha, Hunan, 410083, China; ShenZhen Research Institute of Central South University, Yuanna Road 607, Shenzhen, Guangdong, 518057, China.
authors.forename: Zhaoguang
authors.initials: Z
authors.lastname: Yang
authors.affiliation: School of Chemistry and Chemical Engineering, Central South University, Lushan South Road 932, Changsha, Hunan, 410083, China.
authors.forename: Houzhi
authors.initials: H
authors.lastname: Liu
mesh_terms: D000327:Adsorption; D001673:Biodegradation, Environmental; D029624:Ferns / Q000502:physiology*; D007700:Kinetics; D013816:Thermodynamics; D014501:Uranium / Q000378:metabolism*; D014875:Water Pollutants, Radioactive / Q000378:metabolism*
chemical_list: D014875:Water Pollutants, Radioactive; D014501:Uranium
keywords: Biosorption; Cyclosorus interruptus; Different section; Hottentot Fern; Modification; U(VI)