Amidoxime group-containing modified silica gel adsorbent and preparation method thereof

Abstract

Belonging to the field of modified silica gel adsorbents, the invention particularly relates to an amidoxime group containing modified silica gel adsorbent specific to heavy metal copper ions in an adsorption solution and a preparation method thereof. The preparation method includes: taking silica gel as a starting raw material, conducting activation by a methanesulfonic acid solution, performing impregnation in a toluene solution of KH580, carrying out drying, then adding the obtained dry particles into an N, N-dimethylformamide solution of acrylonitrile to undergo first modification, and carrying out a treatment, then adding the dried first modified particles into a mixed solution of a hydroxylamine hydrochloride solution and a sodium carbonate solution to perform second modification, and conducting a treatment, thus obtaining dried second modified particles, i.e. an amidoxime group containing modified silica gel adsorbent finished product. Compared with an adsorption capacity of 0.5mg / g of the original silica gel, the adsorption capacity of the amidoxime containing modified silica gel adsorbent involved in the invention is substantially increased to 20mg / g.

Description

technical field The invention belongs to the field of modified silica gel adsorbents. In particular, it relates to an amidoxime group-containing modified silica gel adsorbent for adsorbing heavy metal copper ions in a solution and a preparation method thereof. Background technique As we all know, with the rapid development of my country's national economy, environmental pollution and its derived economic and social problems are increasingly emerging. The protection, deterioration and treatment of the water environment have also attracted widespread attention from all walks of life, especially the treatment of heavy metal polluted water bodies. The research and development of practical new governance technologies is of great theoretical and practical significance to the protection of water resources, human life and health, and the sustainable development of economy and society. Among many heavy metal water treatment technologies, the adsorption and enrichment of heavy me...

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Problems solved by technology

But still there are following deficiencies: 1. the adsorption equilibrium time is long; 2. the adsorption effect on low-concentration heavy metals is not good; The prepared titanium dioxide is blended with oxime to obtain a hybrid amidoxime-based uranium-extracting material, but there are still the following deficiencies: ①The mechanical strength of the obtained material is not enough; ②The adsorption capacity of the material to uranium is not high; Chinese patent CN101357325A, a Spherical cellulose chelating adsorbent with amidoxime group and carboxyl group and its preparation method. This patent uses acrylonitrile and cellulose graft copolymerization, followed by saponification and oximation to prepare a chelating agent containing amidoxime group and carboxyl group. Carboxylated spherical cellulose chelate adsorption material, but there are still the following deficiencies: ①The degree of grafting is not high; ②The adsorption selectivity of the material is not high; ③The specific surface area of ​​the material is not large enough to lead to poor adsorption effect

Chinese patent CN101954268A, a method for preparing an adsorbent for heavy metal ions in water. This patent uses mercapto compounds to modify nano-titanium dioxide to obtain a nano-titanium dioxide adsorption material containing mercapto groups. However, the following disadvantages still exist: the nano-scale adsorption material is not easy Separation may cause secondary pollution

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