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Biomass adsorbent, and preparation method and applications thereof

A technology of biomass adsorbent and biomass waste, applied in the direction of chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve the problems of high price, small capacity, and expensive treatment of synthetic resins, and achieve High adsorption capacity, high capacity adsorption effect

Inactive Publication Date: 2015-07-22
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The activated carbon adsorption method has good selectivity for gold ion adsorption, but the capacity is small (56mg / g), regeneration is difficult, and the treatment cost is expensive
Synthetic resin is expensive, difficult to regenerate, and less selective than activated carbon

Method used

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  • Biomass adsorbent, and preparation method and applications thereof
  • Biomass adsorbent, and preparation method and applications thereof
  • Biomass adsorbent, and preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] Embodiment 1 adds and does not add complexing agent EDTA, the selectivity of biomass adsorbent to metal

[0084] 1) Preparation of original solutions of various metal ions: In this example, the hydrochloric acid system is taken as an example, and a certain quality of chloroauric acid, chloroplatinic acid, rhodium chloride, copper chloride, ferric chloride, cobalt chloride, chloride The solids of nickel and palladium chloride were dissolved in deionized water respectively, and the insolubles were removed by filtration to obtain the original solutions of various metal ions respectively, with a concentration of 1 mmol / L.

[0085] 2) Use the solution in 1) as the mother solution, adjust the pH of the solution with HCl and NaOH, and prepare mixed metal solutions with different acidities. The acidity is: 1M HCl, pH=1, 2, 3, 4, 5, 6, mixed metals include Chloroauric acid, chloroplatinic acid, rhodium chloride, copper chloride, ferric chloride, cobalt chloride, nickel chloride ...

Embodiment 2

[0091] Embodiment 2 thermodynamic adsorption isotherm

[0092] 1) Preparation of gold ion single-component solution: In this example, the hydrochloric acid system is taken as an example, a certain mass of chloroauric acid solid is added to deionized water to dissolve, and the insoluble matter is filtered to obtain a 0.1mol / L gold ion single-component solution.

[0093] 2) Put 10mg of thiourea-modified corn straw adsorbent into 13 50mL Jusai Erlenmeyer flasks, add different volumes of chloroauric acid solution prepared in step 1), add hydrochloric acid, and dilute to the total solution volume with deionized water The concentration of gold ions in the solution is distributed between 0.1mmol / L and 30mmol / L, and the concentration of HCl is 1M.

[0094] 3) Place the Jusai Erlenmeyer flask in step 2) in a water bath shaker for adsorption reaction, the reaction conditions are: shaker speed: 120r / m, water bath temperature: 298K, adsorption reaction time: 48h.

[0095] 4) After the ad...

Embodiment 3

[0097] The regeneration of the adsorbent of embodiment 3 loaded gold and the recovery of elemental gold

[0098] 1) Preparation of 20mmol / L chloroauric acid solution: In this study, the hydrochloric acid system was taken as an example, a certain mass of chloroauric acid solid was added to deionized water to dissolve, an appropriate amount of hydrochloric acid was added, insoluble matter was removed by filtration, and deionized water was used to make up to volume. Obtain 20mmol / L chloroauric acid solution, the concentration of hydrochloric acid is 1M.

[0099] 2) Put 100mg of adsorbent into a 150mL Erlenmeyer flask with a stopper, and add the chloroauric acid solution prepared in step 1).

[0100] 3) Place the stoppered Erlenmeyer flask in step 4) in a water-bath shaker for adsorption reaction, reaction conditions, shaker speed: 120r / m, water-bath temperature: 298K, adsorption reaction time: 48h.

[0101] 4) After the reaction is finished, filter to obtain a clear liquid phase...

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Abstract

The invention relates to a biomass adsorbent prepared by taking biomass waste as a raw material via thiourea modification, an application method used for realizing high-capacity adsorption and recovery of gold from aqueous solutions. A preparation method comprises following steps: biomass waste is activated with NaOH, and then is subjected to selective oxidation in the presence of NaIO4 so as to obtain a biomass waste material with dialdehyde functional groups; introduction of thiourea groups is realized via Schiff reaction of aldehyde groups with amino groups in thiosemicarbazide so as to obtain the thiourea-modified biomass adsorbent. According to the application method, the biomass adsorbent is added into a gold adsorbed solution at a certain solid liquid ratio; after oscillation of a certain time, solid liquid separation is realized, the biomass adsorbent loaded with gold is processed with acidic thiourea hydrochloric acid solution for gold desorption, or the biomass adsorbent loaded with high concentration gold is subjected to roasting, and metallic gold is obtained via decomposition of the biomass adsorbent. Adsorption capacity of the biomass adsorbent on gold ions in multi-metal coexistent systems is high; and high-selectivity recovery of gold from aqueous solutions is realized.

Description

technical field [0001] The invention relates to a preparation method of a biomass adsorbent, a biomass adsorbent prepared by the method, and a method for selectively extracting and separating gold from an aqueous solution by using the biomass adsorbent and finally recovering elemental gold, belonging to the field of hydrometallurgy . Background technique [0002] Gold, located in the first subgroup of the sixth cycle in the periodic table, has very little content in the earth's crust, and its resources are extremely scarce compared to the increasing demand. Gold, the beautiful metallic luster and stability endow gold with unique ornamental value and collection value; excellent ductility, processability, and catalytic activity, gold has also been widely used in high-tech and medical fields; excellent electrical conductivity and Corrosion resistance, gold is widely used in the electrical and electronic industry. my country's gold mine resources are short, and most of them ar...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F1/62C22B7/00C22B11/00
CPCY02P10/20
Inventor 赵君梅王福春霍芳刘会洲
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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