Uptake and recovery of gold ions from electroplating wastes using eggshell membrane

Ishikawa, Shin‐ichi; Suyama, Kyozo; Arihara, Keizo; Itoh, Makoto

doi:10.1016/s0960-8524(01)00134-1

Cited by 166 publications

(80 citation statements)

References 17 publications

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“…[1][2][3][4][5][6][7] Previously, one of the authors reported that persimmon tannin (PT) gel, a newly developed biosorbent, adsorbed large amounts of gold from a solution containing hydrogen tetrachloroaurate(III). 8 The gold adsorption by the gel was rapid, endothermic, and obeyed the Langmuir isotherm.…”

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confidence: 99%

Mechanism of Gold Adsorption by Persimmon Tannin Gel

et al. 2003

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IntroductionRecently, attention has been focused on the recovery of gold from aqueous solutions from the standpoints of gold recovery from industrial resources, such as electronics parts and plating materials. [1][2][3][4][5][6][7] Previously, one of the authors reported that persimmon tannin (PT) gel, a newly developed biosorbent, adsorbed large amounts of gold from a solution containing hydrogen tetrachloroaurate(III). 8 The gold adsorption by the gel was rapid, endothermic, and obeyed the Langmuir isotherm. On the other hand, the gel also adsorbed large amounts of uranium, 9 iron, 10 and vanadium. 11 The gel contained a number of adjacent hydroxyphenyl groups, which are suitable ligands for hard acids, such as uranyl, iron(III), and vanadyl ions, based on the HSAB idea. 12,13 Because Au(III) ion is softer than these cations, hydroxyphenyl groups in the gel are not suitable.Preliminary experiments revealed that colloidal Au(0) was formed in a HAuCl4 solution containing PT gel. In this note, therefore, further experiments were conducted to analyze the mechanism of gold adsorption. ExperimentalThe persimmon tannin (PT) solution used throughout this study was obtained from Tomiyama Shoten, Kyoto. PT gel was prepared as previously described. 8,11 Hydrogen tetrachloroaurate(III) tetrahydrate and other chemicals used for this study were obtained from Nacalai Tesque, Inc. (Kyoto, Japan). Gold adsorption experiments in a column system were conducted as follows: 1000 ml of a solution (pH 3) containing 0.1 mM HAuCl4 was passed through a column (diameter 8 mm, bed volume 8.9 ml) of PT gel at 150 and 300 ml/h, collecting 100 ml for each fraction. The pH of the gold solution was adjusted to 3 by 0.1 M HCl and 0.1 M NaOH. To avoid an optical reduction of Au(III) ion, adsorption experiments were conducted under dark conditions. The gold content in each fraction was determined by a inductively coupled plasma quantometer (Shimadzu ICPQ 1000II). A colloidal Au(0) solution was prepared by adding 20 µM of formaldehyde to a solution containing 0.05 mM HAuCl4. After adjusting the pH to the desired value by 0.1 M HCl and 0.1 M NaOH, the mixture solution was allowed to stand. The time when the gold solution became colored purplish red was recorded as the time for colloid formation. Fifty milliliters of the resulting colloidal Au(0) solution were passed through a column (diameter 8 mm, bed volume 5 ml) of PT gel at 100 ml/h. The gold adsorption ratio (%) was estimated from the gold content in each elute. The optical absorption spectra were measured using an absorption spectrophotometer (Japan Spectroscopic Co. Ltd., JASCO V-550). Powder X-ray diffraction (XRD) patterns of PT adsorbed gold were recorded with a powder X-ray diffractometer (Shimadzu XD-D1) using Cu Kα1 radiation (λ = 1.54056 Å) over a 2θ range from 1˚ to 80˚. Results and DiscussionThe effect of the flow rate on gold adsorption by PT gel was examined in a column system, the results of which are listed in Table 1. When the HAuCl4 solution (pH 3) was passed through the PT g...

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Mechanism of Gold Adsorption by Persimmon Tannin Gel

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“…It is clear that the preparation method has a significant influence on the morphology of the sample. It is well known that there are a plenty of functional groups (e.g., amines, amides and carboxylic) on the surface of this bio-membranes template [29]. Zirconium ions can be easily chelated or adsorbed onto the template surface, as a result, the coating of zirconium on the template can form.…”

Section: Catalytic Combustion Of Chmentioning

confidence: 99%

Cataluminescence and Catalysis Properties of CO Oxidation Over Porous Network of ZrO2 Nanorods Synthesized by a Bio-Template

Teng¹,

Zhu²,

He³

et al. 2009

TOCATJ

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A network of ZrO 2 nanorods was prepared using the porous biomembranes as templates. The sample was characterized by SEM, XRD and nitrogen physicosorption isotherm. ZrO 2 nanoparticles were also prepared with a hydrothermal method in order to compare with this network. The results showed that after being calcined at 800 o C for 24 h, a volume contraction of ZrO 2 nanorod network occurred accompanied by a phase transformation of tetragonal-to-monoclinic ZrO 2 ; but the nanoparticles have grown into the large microparticles; as a result, ZrO 2 nanorod network has a higher BET area (45.7 m 2 g -1 ) and a larger pore volume (0.20 cm 3 g -1 ). The calcined network showed a higher cataluminescence (CL) intensity of CO oxidation and a higher combustion activity than the calcined particles, which was ascribed its high surface area, as well as advanced pores.

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“…3) The effectiveness of egg shell membrane for recovery from burns 4) and for the adsorption of many metal ions 5,6) such as Fe 3þ , Cu 2þ , Zn 2þ , Cd 2þ , Co 2þ , Ag þ , Pt 2þ and Au 3þ , and of acitnides 7) has been reported. But egg shell membrane is a little-used proteinaceous resource, because its available size is very small, and it cannot be liquefied or rendered soluble due to a substantial degree of crosslinkage such as cystine, hydroxylysinonorleicine, and desmosines.…”

Section: Improved Physical and Biochemical Features Of A Collagen Memmentioning

confidence: 99%

“…SEP-PSC matrix was prepared according to the method described previously. 11) In brief, 10 g of an SEP-PSC solution (solvent, 0.05 M acetate buffer [pH 6.0]; PSC conc., 0.3%; SEP:PSC proportions, 0:1, 1:10, and 1:1 [w/w]) on an acrylic resin tray (5 Â 5 Â 1 cm 3 ) was incubated at 37 C for 24 h, and then dried for 24 h under an air stream at 37 C to obtain a membrane. The dried membrane was cross-linked by pouring onto it 5 ml of a 1-ethyl-3-(3-[dimethylamino]propyl) carbodiimide (EDC) solution (10 mg/ml), and then incubating at 37 C for 12 h to it.…”

Section: )mentioning

confidence: 99%