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Preparation of formaldehyde-free persimmon tannin-based rigid foam as an adsorbent for selective recovery of Au(III) ions

文献类型: 外文期刊

作者: Fan, Ruiyi 1 ; Hong, Xingxing 3 ; Min, Huiyu 3 ; Yi, Qingping 4 ; Zhang, Qinglin 3 ; Luo, Zhengrong 3 ;

作者机构: 1.Guangdong Acad Agr Sci, Key Lab South Subtrop Fruit Biol & Genet Resource, Inst Fruit Tree Res, MOA, Guangzhou 510640, Guangdong, Peoples R China

2.Guangdong Prov Key Laboratary Trop & Subtrop Frui, Guangzhou 510640, Guangdong, Peoples R China

3.Huazhong Agr Univ, Key Lab Hort Plant Biol, MOE, Wuhan 430070, Hubei, Peoples R China

4.Jingchu Univ Technol, Coll Bioengn, Jingmen 448000, Peoples R China

5.Huanggang Normal Univ, Hubei Collaborat Innovat Ctr Characterist Resourc, Huanggang 438000, Peoples R China

关键词: Persimmon bark; Tannin rigid foam; Adsorption; Au(III); Selective recovery

期刊名称:DESALINATION AND WATER TREATMENT ( 影响因子:1.254; 五年影响因子:1.553 )

ISSN: 1944-3994

年卷期: 2019 年 151 卷

页码:

收录情况: SCI

摘要: A new and green tannin rigid foam was prepared without using formaldehyde and named as "Kaki-TRF" since the tannin is derived from waste persimmon (Diospyros kaki Thunb.) barks. Persimmon tannin is highly reactive and the cross linker is not necessary. The prepared foam was of porous nature and the Brunauer-Emmett-Teller (BET) surface area is 7.014 m (2) g(-1). Adsorption of Au(III) ions from aqueous solution by Kaki-TRF was investigated including the effect of solid-liquid ratio, initial pH, reaction time, initial concentration of Au(III) and ionic strength. The selective property of Kaki-TRF toward Au(III) was examined in both static and continuous adsorption manners. Pseudo-second-order and Langmuir can well fit the experimental data of adsorption kinetics and isotherms. The calculated maximum adsorption capacity of Kaki-TRF toward Au(III) is 1.31 mmol g(-1) which is relatively high compared with other porous bio-sorbents. Electrostatic attraction and in situ reduction were proposed to be the main adsorption mechanisms. The adsorption-regeneration recycling test proved that Kaki-TRF can be reused for at least five times.

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