title: Selective adsorption and recovery of Au(III) from three kinds of acidic systems by persimmon residual based bio-sorbent: a method for gold recycling from e-wastes.
abstract: A low cost bio-sorbent, named "PPF resin", was prepared by crosslinking the persimmon residual with formaldehyde. The adsorption behavior of PPF resin towards Au(III) from varied HCl and HNO3 concentration solutions was studied. PPF resin could adsorb almost complete Au(III) from high acidic systems. The influence of dilution ratio, solid-liquid ratio and time towards Au(III) from aqua regia leached PCBs liquor was censored in detail by batch and continuous adsorption methods. The PPF resin before and after adsorption was characterized by FT-IR, XRD and XPS spectra which provided evidences for the reduction of Au(III) to Au(0) with a proposed mechanism of Au(III) adsorption-reduction process. After saturated column adsorption of 0.1g PPF resin, 0.0506 g gold (purity: 99.9%) was obtained by the method of incineration. The present results provide a new approach for gold recovery from the secondary resources.
authors.affiliation: Key Laboratory of Horticultural Plant Biology (MOE), Huazhong Agricultural University, 430070 Wuhan, China.
authors.forename: Ruiyi
authors.initials: R
authors.lastname: Fan
authors.affiliation: Key Laboratory of Horticultural Plant Biology (MOE), Huazhong Agricultural University, 430070 Wuhan, China; Institute of Horticultural Sciences, Jiangxi Academy of Agricultural Sciences, 330200 Nanchang, China.
authors.forename: Feng
authors.initials: F
authors.lastname: Xie
authors.affiliation: Key Laboratory of Horticultural Plant Biology (MOE), Huazhong Agricultural University, 430070 Wuhan, China.
authors.forename: Xueliang
authors.initials: X
authors.lastname: Guan
authors.affiliation: Key Laboratory of Horticultural Plant Biology (MOE), Huazhong Agricultural University, 430070 Wuhan, China.
authors.forename: Qinglin
authors.initials: Q
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Horticultural Plant Biology (MOE), Huazhong Agricultural University, 430070 Wuhan, China. Electronic address: luozhr@mail.hzau.edu.cn.
authors.forename: Zhengrong
authors.initials: Z
authors.lastname: Luo
mesh_terms: D000143:Acids / Q000737:chemistry*; D000327:Adsorption; D006046:Gold / Q000737:chemistry*; D059027:Recycling
chemical_list: D000143:Acids; D006046:Gold
keywords: Gold; Industrial application; Persimmon tannin; Selective recovery; e-waste