Method for absorbing and recycling heavy metals by using persimmon tannins

An adsorption material, adsorption recovery technology, applied in the direction of selective adsorption, chemical instruments and methods, ion exchange, etc., can solve the problems of slow adsorption and desorption, small adsorption capacity, slow adsorption speed, etc., to achieve high adsorption rate and adsorption capacity. Large, slow adsorption effect

Inactive Publication Date: 2012-07-04
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology

Commonly used adsorption materials include activated carbon, synthetic resin, minerals, microorganisms and natural biomass, etc.; the research results of Zhang Huiping, Zhu Liguo, et al. 2+ 、Ni 2+ The saturated adsorption capacity of the modified activated carbon fiber is 5.1mg/g, 6.6mg/g respectively, and the modified activated carbon fiber has a 2+ 、Ni 2+ The saturated adsorption capacity reaches 20.6mg/g, 8.0mg/g, and the adsorption capacity is still relatively small; this method still has some shortcomings in industrial application: first, the adsorption capacity is low, such as activated carbon only

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The prepared cowhide collagen fiber solidified persimmon tannin adsorption material is used to adsorb copper, and the operation steps are as follows:

[0030] 1. Configure 5 groups of CuSO with different concentrations 4 solution, using a spectrophotometer to make Cu 2+ The standard curve, and its concentration-absorbance fitting equation is obtained by linear fitting, and the degree of fitting R 2 Greater than 0.999;

[0031] 2. Take the persimmon tannin adsorption material prepared by a certain quality, soak it in deionized water for 24 hours, and then place it in a certain initial concentration of CuSO 4 In the solution, adjust the pH value of the solution to 6.0, use ultrasonic oscillation, and then load it into a chromatographic analysis column, and use the method of column packing for static adsorption;

[0032] 3. Use a spectrophotometer to measure the absorbance of the solution after adsorption. Through the prepared copper standard curve and the concentration...

Embodiment 2

[0035] Get 0.5 g of the prepared cowhide collagen fiber solidified persimmon tannin, soak it in deionized water for 24 hours, and configure the Fe-containing 2+ FeSO with an ion concentration of 1000mg / L 4 solution 50ml, put the solidified persimmon tannin adsorbent in FeSO 4 In the solution, its pH was measured to be 4.05, the solution was loaded into a chromatographic analysis column, the glass piston was tightened, and after oscillating and adsorbing for 4 hours, it was left to stand for 48 hours; according to the Fe measured by spectrophotometry, 2+ Standard curve and fitting equation Y=2.77556E-17+0.1915X, calculate its concentration after adsorption. Measured: the absorbance of the solution after adsorption is 0.008, and the corresponding concentration is 0.042mg / L. After calculation, the effect of this cowhide collagen fiber solidified persimmon tannin on Fe 2+ The adsorption rate is 99.9%, and almost all of them are adsorbed.

[0036] Using 0.1mol / L of H 2 SO 4 Th...

Embodiment 3

[0038] Get 0.5 g of the prepared cowhide collagen fiber solidified persimmon tannin, soak it in deionized water for 24 hours, and configure the Fe-containing 3+ Fe with an ion concentration of 500mg / L 2 (SO 4 ) 3 Solution 50ml, put solidified persimmon tannin adsorbent in Fe 2 (SO 4 ) 3 In the solution, its pH was measured to be 2.18, the solution was loaded into a chromatographic analysis column, the glass piston was tightened, and after oscillating and adsorbing for 4 hours, it was left to stand for 24 hours; according to the Fe measured by spectrophotometry, 3+Standard curve and fitting equation Y=0.01795+3.03771X, calculate its concentration after adsorption. Measured: the absorbance of the solution after adsorption is 0.147, and the corresponding concentration is 0.042mg / ml. After calculation, the effect of this cowhide collagen fiber solidified persimmon tannin on Fe 3+ The adsorption rate is 91.5%, and the adsorption capacity is 45.752mg / g; put 40ml of the filtere...

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Abstract

The invention discloses a method for absorbing and recycling heavy metals by using persimmon tannins. The absorbing material used in the method is prepared by the steps of: firstly dissolving cowhide collagen fibers and persimmon powder in water, reacting, adding glutaraldehyde or formaldehyde, reacting at the temperature of 50 DEG C and filtering, drying in vacuum and grinding. According to the method for absorbing and recycling the heavy metal, a chromatographic analytical column adsorption method is adopted to absorb and recycle precious metal, such as copper, iron, chrome and silver, wherein the average adsorption rate is above 95%. The method is applied to the absorbing and recycling treatments of a plurality of heavy metal ions in industrial wastewater with low concentration (less than 1000mg/L); and the method is low in the operating cost, can be reused and has no secondary pollution to the environment.

Description

technical field [0001] The invention relates to the adsorption recovery of heavy metals, in particular to a method for adsorption and recovery of heavy metals by persimmon tannin adsorption materials. Background technique [0002] At present, there are three main methods for treating precious metal-containing wastewater and waste residue at home and abroad: one is chemical precipitation, the other is biological treatment, and the third is adsorption. [0003] In the chemical precipitation method, because of the precipitation of heavy metal ions produced by the precipitation reaction, the final disposal is usually landfill, so the environmental pollution of toxic heavy metals still exists for a long time, which is actually a kind of pollution transfer. At present, most biological treatment methods are in the stage of experimental research, and most of them stay in the discussion of influencing factors, and there is still a considerable distance from industrial application. A...

Claims

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Application Information

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IPC IPC(8): B01D15/08B01J20/22B01J20/30
Inventor 王仲民崔健周治德戴培邦周怀营李桂银
Owner GUILIN UNIV OF ELECTRONIC TECH
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