Persimmon tannin adsorption material and preparation method thereof

Abstract

The invention discloses a persimmon tannin adsorption material and a preparation method of the persimmon tannin adsorption material. The preparation method comprises the steps of: adding 2-5 parts of cattle-hide collagen fiber and 5-8 parts of persimmon powder which are treated into 100 parts of deionized water to be mixed and dissolved, and stirring for 10-20h at the normal temperature; adding 3-8 parts of cross-linking agent into the mixed solution, adjusting the pH value of the mixed solution to 6.0-6.6 by NaOH or HCl water solution, and carrying out reaction for 1-3 hours at the normal temperature; leading reactant to carry out water bath reaction for 3-5h at the temperature of 50-60 DEG C; taking out products of the reaction and filtering, carrying out vacuum drying at the temperature of 60 DEG C; and after drying, grinding the products into fine powder by a grinding machine to obtain the cattle-hide collagen fiber-cured persimmon tannin adsorption material. The persimmon tannin adsorption material is good in physical stability, remarkable in adsorption effect, low in cost and free from secondary pollution for the environment, and can be used in a circulating way; the persimmon tannin adsorption material is used for carrying out adsorption recovery test on noble metals such as Cu, Cr, Fe, Ag and the like, and the average adsorption rate reaches more than 95%, so that better adsorption effect can be achieved; and the persimmon tannin adsorption material disclosed by the invention is suitable for adsorbing, separating and recovering the heavy metal ions in industrial waste water with low concentration.

Description

technical field [0001] The invention belongs to the field of functional polymer materials, in particular to a persimmon tannin adsorption material and a preparation method thereof. Background technique [0002] At present, there are three main methods for treating heavy metal-containing wastewater and waste residue at home and abroad: one is chemical precipitation, the other is biological treatment, and the third is adsorption. Adsorption method is a more effective method for treating heavy metal ion wastewater, especially low concentration heavy metal ion wastewater. Commonly used adsorption materials include activated carbon, synthetic resin, minerals, microorganisms and natural biomass, etc.; South China University of Technology Zhang Huiping, Zhu Liguo et al. The adsorption performance of activated carbon fiber and modified activated carbon fiber on heavy metal ions, the results show that: activated carbon fiber on Cu 2+ 、Ni 2+ The saturated adsorption capacity of the ...

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Problems solved by technology

Adsorption method is a more effective method for treating heavy metal ion wastewater, especially low concentration heavy metal ion wastewater. Commonly used adsorption materials include activated carbon, synthetic resin, minerals, microorganisms and natural biomass, etc.; South China University of Technology Zhang Huiping, Zhu Liguo et al. The adsorption performance of activated carbon fiber and modified activated carbon fiber on heavy metal ions, the results show that: activated carbon fiber on Cu 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 has reached 20.6mg / g, 8.0mg / g, and the adsorption capacity is still relatively small; these adsorption materials still have some shortcomings in industrial applications. First, the adsorption capacity is low. There is adsorption and the adsorption capacity is usually between 5-20mg / g; second, the adsorption and desorption speed is slow. The currently used adsorption materials mainly depend on the porous nature of the adsorption materials themselves, and heavy metal ions mainly pass through the pores of the adsorption materials. Third, many adsorption materials cannot be regenerated and reused after adsorption and saturation, and can only be treated as solid waste for landfill or incineration, which often causes secondary pollution

[0003] Tannin is a natural polyphenolic compound, which widely exists in plants. The multiple ortho phenolic hydroxyl groups of tannin enable it to undergo electrostatic bonding and complexation reactions with various metal ions, and the reaction is rapid, but the single Ning is easily soluble in water and polar organic solvents, so it is difficult to be directly used in industrial wastewater treatment. Existing studies have shown that tannin can be reacted with aldehyde compounds to form tannin resin, or polymer materials can be used as supporting materials , curing tannin on these polymer materials to make a cured tannin adsorption material, but there are still problems such as the tannin is not solidified, easy to fall off, poor stability, etc.