Selective recovery of precious metals by persimmon waste chemically modified with dimethylamine

Xiong, Ying; Adhikari, Chaitanya Raj; Kawakita, Hidetaka; Ohto, Keisuke; Inoue, Katsutoshi; Harada, Hiroyuki

doi:10.1016/j.biortech.2009.03.014

Cited by 88 publications

(53 citation statements)

References 12 publications

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“…The shifting of the free ionization carboxy (C=O) peaks is attributed to the polymerization during the modification (Liang et al 2010a). Moreover, two new peaks at 1315.7 and 459.1 cm -1 are due to amino (N-H) stretching, which infers the polyphenol groups have combined with glycine (Xiong et al 2009). …”

Section: Ft-ir Analysismentioning

confidence: 98%

Study on the adsorption behavior of modified persimmon powder biosorbent on Pt(IV)

Gong

Guo

Liang

et al. 2015

Int. J. Environ. Sci. Technol.

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A glycine-modified persimmon powder was used as biosorbent for platinum adsorption in aqueous solution. The combined effects of modifying agent amount, modifying time and temperature on Pt(IV) adsorption by persimmon biosorbent were investigated, from which the optimum modification conditions with modifying agent amount of 50 %, temperature of 333 K and contact time of 4.0 h were determined. The influences of solution initial pH, solid-to-liquid ratio, contact time, temperature and initial concentration on the Pt(IV) adsorption were studied systematically by batch experiments. The optimum modification conditions were determined as follows: chemical reagent amount of 50 %, temperature of 333 K and contact time of 4.0 h. From the adsorption kinetic analysis, it was found that the adsorption kinetics of glycine-modified persimmon powder followed a pseudo-second-order kinetic model. The adsorption isotherms of the crude persimmon powder and glycine-modified persimmon powder were analyzed with the BET-type adsorption isotherm. The adsorption mechanism of Pt(IV) on the glycine-modified persimmon was considered to be adsorption-reduction mechanism. The results achieved from this study indicated that the novel persimmon adsorbent could be applied to recover trace Pt(IV) ions from a concentrated chloride solution.

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Section: Ft-ir Analysismentioning

confidence: 98%

Study on the adsorption behavior of modified persimmon powder biosorbent on Pt(IV)

Gong

Guo

Liang

et al. 2015

Int. J. Environ. Sci. Technol.

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“…Although, as mentioned earlier, CPT and PP gels were found to exhibit extraordinary high selectivity for gold(III), we further attempted to enhance the affinity also for platinum(IV) and palladium [35][36][37][38][39][40]. It is easy to chemically modify persimmon tannin extract and persimmon waste including persimmon peel by immobilizing a variety of functional groups which exhibit special affinities for some metal ions onto their surface similar to other biomass wastes [41,42].…”

Section: Chemical Modification Of Persimmon Tannin Extract and Persimmentioning

confidence: 99%

“…It is easy to chemically modify persimmon tannin extract and persimmon waste including persimmon peel by immobilizing a variety of functional groups which exhibit special affinities for some metal ions onto their surface similar to other biomass wastes [41,42]. In our research works, persimmon waste was chemically modified by immobilizing functional group of dimethylamine (DMA) to prepare the adsorption gel functioning as a typical weak base type of anion exchange material and investigated its adsorption behavior for some precious and base metals from hydrochloric acid solutions [35,36]. Further, a variety of adsorption gels were prepared from persimmon tannin extract powder by the chemical modifications immobilizing other functional groups such as tertiary amine where the immobilized tertiary amine groups function as quaternary ammonium compounds (QA) [37], a typical strong base, as well as tetraethylenepentamine (TEPA) [38], glycidyltrimethyl ammonium (GTA), aminoguanidine (AG) [40], and bisthiourea (BTU) [41].…”

Section: Chemical Modification Of Persimmon Tannin Extract and Persimmentioning

confidence: 99%

Hydrometallurgical Recovery of Precious Metals and Removal of Hazardous Metals Using Persimmon Tannin and Persimmon Wastes

Inoue

Gurung

Xiong

et al. 2015

Metals

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Novel and environmentally benign adsorbents were prepared via a simple sulfuric acid treatment process using the wastes of astringent persimmon, a type of biomass waste, along with persimmon tannin extract which is currently employed for the tanning of leather and as natural dyes and paints. The effectiveness of these new biosorbents was exemplified with regards to hydrometallurgical and environmental engineering applications for the adsorptive removal of uranium and thorium from rare earths, cesium from other alkaline metals such as sodium, hexa-valent chromium from zinc as well as adsorptive recovery of gold from chloride media. Furthermore, reductive coagulation of gold from chloride media for the direct recovery of metallic gold and adsorptive recovery of palladium and platinum using chemically modified persimmon tannin extract were studied. OPEN ACCESSMetals 2015, 5 1922

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“…The dimethylamine modified persimmon peel gel (abbreviated as DMA-PP) was prepared according to Scheme 2. 1.0 g PP was mixed together with 5 ml acetic acid, 10 ml phosphoric acid, 1.0 g para-formaldehyde, 10 ml 1,4-dioxane and 20 ml hydrochloric acid and the mixture stirred for 18 h at 358 K. The chlorinated product was washed with 0.1 mol/l sodium hydroxide and dried for 3 h at 323 K. Then, it was mixed with 10 ml dimethylamine solution, and heated at 363 K with continuous stirring for 3 h. The product was filtered and washed by 0.1 mol/l NaCl, and finally dried and sieved to 150 mesh size [9].…”

Section: Preparation Of the Dimethylamine Modified Persimmon Peel Gelmentioning

confidence: 99%

Recovery of Precious Metals by Selective Adsorption on Dimethylamine-Modified Persimmon Peel

Xiong

Adhikari

Kawakita

et al. 2010

Waste Biomass Valor

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Dimethylamine (DMA) functional group was grafted to obtain modified persimmon peel gel (DMA-PP) with the focus of development of selective recovery of gold as well as other precious metals like palladium and platinum. The adsorption behavior of the DMA-PP gel for various metal ions at varying hydrochloric acid concentrations has been studied. It was found that the DMA-PP exhibits high affinity for Au(III) as well as for Pt(IV) and Pd(II) and no affinity for base metals such as Cu(II), Fe(III), Ni(II), and Zn(II) under the operating conditions. The valuated apparent activation energy value suggests that adsorption of Au(III) on the DMA-PP gel is a chemical process. Another important result is that the size of the gel has an important effect on kinetics of the adsorption and reduction of Au(III). The application of this gel which has very high adsorption capacity and selectivity avoids the use of any additional reducing agents for the recovery of Au(III) in elemental form. In addition, its excellent adsorption characteristics for the precious metals were confirmed under dynamic conditions of column operation.

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Selective recovery of precious metals by persimmon waste chemically modified with dimethylamine

Cited by 88 publications

References 12 publications

Study on the adsorption behavior of modified persimmon powder biosorbent on Pt(IV)

Study on the adsorption behavior of modified persimmon powder biosorbent on Pt(IV)

Hydrometallurgical Recovery of Precious Metals and Removal of Hazardous Metals Using Persimmon Tannin and Persimmon Wastes

Recovery of Precious Metals by Selective Adsorption on Dimethylamine-Modified Persimmon Peel

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