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| Adsorption of Cd2+ from Solution by Modified Ginkgo Shell Powder |
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| KeyWord:gingko shells; chemical modification; Cd2+; kinetic model; isothermal adsorption model; SEM; FT-IR |
| Author Name | Affiliation | | SU Juan | College of Resource and Environment, Sichuan Agricultural University, Chengdu 611130, China | | WU Jun | College of Resource and Environment, Sichuan Agricultural University, Chengdu 611130, China | | YANG Gang | College of Resource and Environment, Sichuan Agricultural University, Chengdu 611130, China | | WANG Zhang-hong | College of Resource and Environment, Sichuan Agricultural University, Chengdu 611130, China |
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| Abstract: |
| Utilizing agricultural or forestry wastes to remove heavy metals in water has recently received much attention. In this work, ginkgo shells were ground and modified with 1％KMnO4 solution to make a adsorbing material named WSK. The effects of temperature, pH, time and original Cd2+ concentrations on Cd2+ adsorption by WSK were investigated. Cadmium adsorption mechanisms were also discussed based on the adsorption model, SEM and FTIR data. The adsorption capacity of Cd by WSK enhanced as the temperature increased. Cadmium adsorption was increased at lower solution pH but reduced at higher pH, with adsorption peak occurred at pH5.5. The Cd2+ adsorption by WSK reached equilibrium in 60 mins. Increasing original Cd2+ concentrations enhanced Cd2+ adsorption, but decreased Cd2+ removal percentages. Adsorption of Cd2+ was fit to the Freundlich model with R2 of 0.94, and the largest adsorption was 119.76 mg·g-1. The adsorption kinetics was described by the second-order kinetic adsorption model with R2 of 0.9995. SEM indicated that WSK surface was porous, which might increase Cd2+ adsorption on WSK. IR-spectrum showed that Cd2+ was adsorbed to WSK via coordination of functional groups such as -OH, -COO, -NH-, C=O, -P=O and -CH-, with -COO- playing an important role. |
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