title: Equilibrium and kinetic studies of Cd²⁺ biosorption by the brown algae Sargassum fusiforme.
abstract: A fundamental investigation of the biosorption of Cd2+ from aqueous solution by the edible seaweed Sargassum fusiforme was performed under batch conditions. The influences of experimental parameters, such as the initial pH, sorption time, temperature, and initial Cd2+ concentration, on Cd2+ uptake by S. fusiforme were evaluated. The results indicated that the biosorption of Cd2+ depended on the initial Cd2+ concentration, as well as the pH. The uptake of Cd2+ could be described by the Langmuir isotherm model, and both the Langmuir biosorption equilibrium constant and the maximum biosorption capacity of the monolayer decreased with increasing temperature, thereby confirming the exothermic character of the sorption process. The biosorption kinetics follows the pseudo-second-order kinetic model, and intraparticle diffusion is the sole rate-limiting step for the entire biosorption period. These fundamental equilibrium and kinetic results can support further studies to the removal of cadmium from S. fusiforme harvested from cadmium-polluted waters.
authors.affiliation: Zhejiang Provincial Key Lab for Subtropical Water Environment and Marine Biological Resources Protection, College of Life and Environmental Science, Wenzhou University, Wenzhou, China.
authors.forename: Hui-Xi
authors.initials: HX
authors.lastname: Zou
authors.affiliation: Zhejiang Provincial Key Lab for Subtropical Water Environment and Marine Biological Resources Protection, College of Life and Environmental Science, Wenzhou University, Wenzhou, China.
authors.forename: Nan
authors.initials: N
authors.lastname: Li
authors.affiliation: Zhejiang Provincial Key Lab for Subtropical Water Environment and Marine Biological Resources Protection, College of Life and Environmental Science, Wenzhou University, Wenzhou, China.
authors.forename: Li-Hua
authors.initials: LH
authors.lastname: Wang
authors.affiliation: Zhejiang Provincial Key Lab for Subtropical Water Environment and Marine Biological Resources Protection, College of Life and Environmental Science, Wenzhou University, Wenzhou, China.
authors.forename: Ping
authors.initials: P
authors.lastname: Yu
authors.affiliation: Zhejiang Provincial Key Lab for Subtropical Water Environment and Marine Biological Resources Protection, College of Life and Environmental Science, Wenzhou University, Wenzhou, China.
authors.forename: Xiu-Feng
authors.initials: XF
authors.lastname: Yan
mesh_terms: D065966:Absorption, Physicochemical; D001692:Biological Transport; D002104:Cadmium / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D044647:Sargassum / Q000378:metabolism*; D013696:Temperature; D014874:Water Pollutants, Chemical / Q000378:metabolism*
chemical_list: D014874:Water Pollutants, Chemical; D002104:Cadmium
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