title: Facile fabrication of Pd nanoparticle/Pichia pastoris catalysts through adsorption-reduction method: a study into effect of chemical pretreatment.
abstract: Based on rapid adsorption and incomplete reduction in Pd (II) ions by yeast, Pichia pastoris (P. pastoris) GS115, the effects of pretreatment on adsorption and reduction of Pd (II) ions and the catalytic properties of Pd NP/P. pastoris catalysts were studied. Interestingly, the results showed that the adsorption ability of the cells for Pd (II) ions was greatly enhanced after they were pretreated with aqueous HCl, aqueous NaOH and methylation of amino group. For the reduction in the adsorbed Pd (II) ions, more slow reduction rates by pretreated P. pastoris cells were displayed compared with the cells without pretreatment. Using the reduction of 4-nitrophenol as a model reaction, the Pd NP/P. pastoris catalysts based on the cells after pretreatment with aqueous HCl, aqueous NaOH and methylation of amino group exhibited higher stability than the unpretreated cells. The enhanced stability of the Pd catalysts can be attributed to smaller Pd NPs, better dispersion of the Pd NPs, and stronger binding forces of the pretreated P. pastoris for preparing the Pd NPs. This work exemplifies enhancing the stability of Pd catalysts through pretreatments.
authors.affiliation: Environmental Science Research Center, College of the Environment & Ecology, Xiamen University, Xiamen 361005, PR China.
authors.forename: Huimei
authors.initials: H
authors.lastname: Chen
authors.affiliation: Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, PR China.
authors.forename: Dengpo
authors.initials: D
authors.lastname: Huang
authors.affiliation: Environmental Science Research Center, College of the Environment & Ecology, Xiamen University, Xiamen 361005, PR China.
authors.forename: Liqin
authors.initials: L
authors.lastname: Lin
authors.affiliation: Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, PR China.
authors.forename: Tareque
authors.initials: T
authors.lastname: Odoom-Wubah
authors.affiliation: Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, PR China. Electronic address: cola@xmu.edu.cn.
authors.forename: Jiale
authors.initials: J
authors.lastname: Huang
authors.affiliation: Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, PR China.
authors.forename: Daohua
authors.initials: D
authors.lastname: Sun
authors.affiliation: Environmental Science Research Center, College of the Environment & Ecology, Xiamen University, Xiamen 361005, PR China; Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, PR China; College of Chemistry & Life Science, Quanzhou Normal University, Quanzhou 362000, PR China. Electronic address: kelqb@xmu.edu.cn.
authors.forename: Qingbiao
authors.initials: Q
authors.lastname: Li
keywords: 4-Nitrophenol; Adsorption; Chemical modification; Palladium nanoparticles