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Preparation method for modified walnut shell cation adsorbent

A cation adsorption and walnut shell technology, which is applied in chemical instruments and methods, adsorption water/sewage treatment, and other chemical processes, can solve the problems of difficult regeneration and high cost of activated carbon, and achieve high mechanical strength, high removal rate, and simple process Effect

Inactive Publication Date: 2013-11-06
HOHAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, activated carbon has the disadvantages of high cost and difficult regeneration.

Method used

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  • Preparation method for modified walnut shell cation adsorbent
  • Preparation method for modified walnut shell cation adsorbent
  • Preparation method for modified walnut shell cation adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A kind of preparation method of modified walnut shell cationic adsorbent proposed, its preparation process comprises the following steps:

[0042] Step 1, preprocessing:

[0043] Purchase a small amount of walnuts at the local farmer's market, remove the pulp and shell, remove the inner skin and seed coat, boil in boiling water for 60 minutes, and remove the remaining pulp and skin. Soak in deionized water for 7 days and change it every day to wash away the sticky dust and residual pulp. After one week, bake it at 105°C for 24 hours, crush it with a plant sample grinder, and sieve it to get a particle size of 0.125-0.2 mm, and put it into a jar for later use;

[0044] Step 2, a modification:

[0045] Take 2 g of the walnut shell powder obtained in step 1, add 30 mL of sodium hydroxide solution with a concentration of 1.25 mol / L and 20 mL of epichlorohydrin solution, modify it in a constant temperature combined reactor at 40 ° C for 30 min, and wash it with deionized w...

Embodiment 2

[0049] Operation steps one and three are the same as in embodiment 1, and the difference in step two is modified as follows:

[0050] Take 2 g of the walnut shell powder obtained in step 1, add 15 mL of sodium hydroxide solution with a concentration of 1 mol / L and 20 mL of epichlorohydrin solution, modify it in a constant temperature combined reactor at 40 ° C for 30 min, and wash it with deionized water to medium properties, and vacuum-dried in an oven at 65°C for 3 hours, ground and sieved to obtain primary modified walnut shells with a particle size of 0.125-0.2mm;

Embodiment 3

[0052] Operation steps one and three are the same as in embodiment 1, and the difference in step two is modified as follows:

[0053] Take 2 g of the walnut shell powder obtained in step 1, add 45 mL of sodium hydroxide solution with a concentration of 1 mol / L and 2 mL of epichlorohydrin solution, modify it in a constant temperature combined reactor at 40 ° C for 30 min, and wash it with deionized water to medium properties, and vacuum-dried in an oven at 65°C for 3 hours, ground and sieved to obtain primary modified walnut shells with a particle size of 0.125-0.2mm;

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Abstract

The invention discloses a preparation method for a modified walnut shell cation adsorbent, belongs to the field of modified adsorbent material preparation, and particularly relates to a preparation method for the modified walnut shell cation adsorbent used for adsorption removal of anionic dye in printing and dyeing wastewater. According to the preparation method, waste materials such as walnut shells are used as raw materials; in an alkaline environment, epichlorohydrin is used as an etherifying agent, diethylenetriamine is used as a crosslinker, modifying is performed in two steps and amino groups are introduced, and the poly-amino-contained modified walnut shell cation adsorbent is prepared in a compound mode. Experiment results show that walnut shells modified through the method can absorb anionic azo dyes to the capacity of 500 mg / g, and the adsorption capacity is nearly 9 times the adsorption capacity of non-modified walnut shells. The modified walnut shell cation adsorbent is wide in raw material source, high in mechanical strength, good in chemical stabilization, low in costs, easy to regenerate, simple in modifying method, applicable to the field of printing and dyeing wastewater treatment and high in removal rate, reliable and efficient and has an extremely good prospect.

Description

technical field [0001] The invention belongs to the field of preparation of modified adsorbent materials. In particular, it relates to a preparation method of a modified walnut shell cationic adsorbent for anionic dyes in printing and dyeing wastewater. Background technique [0002] In recent years, with the rapid development of township enterprises and the further acceleration of rural urban construction, the discharge of various domestic sewage and industrial wastewater is increasing, especially the impact of printing and dyeing wastewater on the ecological environment and human health is becoming increasingly serious, and it should be treated accordingly It has become an increasingly prominent issue in environmental governance. The traditional methods for treating dye wastewater include electrochemical method, coagulation precipitation method, oxidation method, membrane separation method and activated carbon adsorption method. Among them, activated carbon adsorption has...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30C02F1/28
Inventor 操家顺林俊雄方芳张明婷江心乔松玲江慧
Owner HOHAI UNIV
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