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Novel heavy metal ion adsorbent and preparation method and use thereof

A technology of heavy metal ions and adsorbents, applied in the directions of alkali metal compounds, chemical instruments and methods, alkali metal oxides/hydroxides, etc., can solve the problem that the adsorption effect of heavy metal ions is easily affected by water quality and the mechanical strength of chitosan is not high. , application limitations of chitosan, etc., to achieve the effect of good adsorption effect, fast adsorption rate and low cost

Inactive Publication Date: 2018-05-29
TIANJIN POLYTECHNIC UNIV
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low mechanical strength of chitosan, as an alkaline polysaccharide, it is easy to dissolve in acidic medium, and the adsorption effect on heavy metal ions is easily affected by water quality, so the application of chitosan is greatly limited.
At the same time, there is a problem of small adsorption capacity for low-concentration heavy metal ions in aqueous solution
[0005] Aiming at the shortcomings of existing adsorbents such as large dosage of synthetic organic polymers, high processing cost, and secondary pollution, the present invention provides a new type of adsorbent, which has high mechanical strength, large adsorption capacity, fast adsorption rate, and no Pollution, can be reused many times, and can be well applied to the removal of harmful heavy metal ions in the food and juice industry, which is of great significance to environmental protection, comprehensive utilization of natural resources and the development of the national economy

Method used

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  • Novel heavy metal ion adsorbent and preparation method and use thereof
  • Novel heavy metal ion adsorbent and preparation method and use thereof
  • Novel heavy metal ion adsorbent and preparation method and use thereof

Examples

Experimental program
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Effect test

example 1

[0028] Example 1: Preparation of Chitosan Composite Resin

[0029] Weigh 2g with a molecular weight of 4×10 4 1. Chitosan powder with a degree of deacetylation of 95% is added with 98 g of acetic acid solution with a concentration of 1% by weight to fully dissolve it to form a light yellow transparent liquid. The above-mentioned 2% by weight chitosan solution was defoamed overnight and allowed to stand for 0.5 h for subsequent use.

[0030] Weigh 5 g of phytic acid and add 95 g of deionized water, and magnetically stir at room temperature until completely dissolved to obtain a 5% by weight phytic acid homogeneous solution. The pH of the solution was adjusted to 5 by sodium hydroxide and hydrochloric acid. Wherein, the deionized water contains glutaraldehyde cross-linking agent, and the weight concentration of glutaraldehyde is 1 gram / 100 gram of chitosan used.

[0031] Extract a certain amount of 2% by weight of chitosan solution with a syringe and inject it into 5% by weig...

Embodiment 1

[0032] The surface of the resin obtained in Example 1 is transparent, the color is light yellow, and the hardness is relatively high.

example 2

[0033] Example 2: Preparation of sodium phytate / chitosan resin

[0034] Weigh 5g with a molecular weight of 1×10 5 1. The chitosan powder with a degree of deacetylation of 85% is added with 95 g of acetic acid solution with a concentration of 5% by weight to fully dissolve it to form a light yellow transparent liquid. The above-mentioned 5% chitosan solution was defoamed overnight and allowed to stand for 0.5 h for later use.

[0035] Weigh 9g of sodium phytate powder and add 91g of deionized water, and stir at room temperature until completely dissolved to obtain a 9% by weight sodium phytate homogeneous solution. The pH of the solution was adjusted to 9 by sodium hydroxide and hydrochloric acid. Wherein, the deionized water contains epichlorohydrin, and the weight concentration of epichlorohydrin is 5 grams per 100 grams of chitosan used.

[0036] Extract a certain amount of 5% by weight of chitosan solution with a syringe, drop it into 9% by weight of sodium phytate solu...

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Abstract

The invention relates to a novel heavy metal ion adsorbent and a preparation method and use thereof. Chitosan is used as a matrix, phytic acid or sodium phytate is cross-linked on the molecular chainof the chitosan through the effect of a crosslinking agent. The novel heavy metal ion adsorbent has high mechanical strength, large adsorption capacity, good adsorption effect and fast adsorption rate, can be reused many times, can be used in the fields of food such as beverages and the like which are polluted by heavy metals, and can effectively reduce heavy metal content. The preparation methodof the novel heavy metal ion adsorbent is simple, low-cost and non-polluting, and has a broad market prospect.

Description

technical field [0001] The invention belongs to the field of adsorbents, and mainly relates to a novel biosorbent, which is suitable for removing heavy metal ions from beverages. Specifically, the present invention relates to a novel adsorbent for heavy metal ions, and the present invention further relates to the adsorbent method of preparation and use. Background technique [0002] Juice contains various minerals such as calcium, phosphorus, iron, chromium, zinc, aluminum, tin, etc., and there may also be a small amount of heavy metal ions harmful to human body such as copper, lead, cadmium, arsenic, and mercury. These metal ions mainly come from electrolytes, electroplating solutions, mining and metal smelting wastewater containing heavy metals such as lead, copper, cadmium, chromium, mercury, as well as the soil where plants grow, irrigation water, applied fertilizers, processing pollution, etc. . The content of calcium, phosphorus, iron, chromium, zinc, cobalt, copper,...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30A23L2/80
CPCB01J20/24A23L2/80B01J20/28021B01J2220/4812B01J2220/4825
Inventor 何本桥孔爱群李建新郝英东崔振宇
Owner TIANJIN POLYTECHNIC UNIV
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