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Preparation method and application of citric acid modified palm tree bark adsorbing agent

A palm bark, citric acid technology, applied in chemical instruments and methods, adsorption water/sewage treatment, textile industry wastewater treatment, etc., to achieve the effects of good desorption performance, high adsorption efficiency, and large adsorption capacity

Inactive Publication Date: 2013-07-24
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of natural polymer material has the characteristics of natural, green, biodegradable, high mechanical strength and strong corrosion resistance. Palm bark can be regenerated and reused many times as an adsorbent, and has a large adsorption capacity for dyes. However, there is no report on the chemical modification and adsorption properties of palm bark abroad.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Palm bark pretreatment: Wash the palm bark with water to remove soil and impurities, put it in a container and soak it in water for 7 days to remove non-fibrous substances, cut the palm bark into small pieces, wash with water, and vacuum dry Pulverize, sieve with 40 mesh sieves, obtain pretreatment palm bark;

[0021] (2) Alkaline treatment of palm bark: Soak the pretreated palm bark with 4% NaOH aqueous solution for 20 hours, boil for 30nm, wash with deionized water after cooling until neutral, and dry at 110°C after suction filtration dry, to obtain alkalized palm bark;

[0022] (3) Preparation of citric acid palm bark: In a reactor, mix alkalized palm bark and 10% by mass citric acid solution at a ratio of 1g:10mL, react at room temperature for 60nm, heat up to 50°C, and react for 30 h, heating up to 125°C, reacting for 1 h, after cooling, washing with distilled water until no citric acid exists in the lotion, to obtain citric acid palm bark;

[0023] (4) Prepa...

Embodiment 2

[0025] (1) Palm bark pretreatment: Wash the palm bark with water to remove soil and impurities, put it in a container and soak it in water for 10 days to remove non-fibrous substances, cut the palm bark into small pieces, wash with water, and vacuum dry Pulverize, sieve with 40 mesh sieves, obtain pretreatment palm bark;

[0026] (2) Alkaline treatment of palm bark: Soak the pretreated palm bark with 6% NaOH aqueous solution for 15 hours, boil for 20nm, wash with deionized water after cooling until neutral, and dry at 100°C after suction filtration dry, to obtain alkalized palm bark;

[0027] (3) Preparation of citric acid palm bark: In a reactor, mix alkalized palm bark and citric acid solution of 15% by mass at a ratio of 1g:8mL, react at room temperature for 40nm, raise the temperature to 50°C, and react for 24 h, heating up to 120°C, reacting for 1.5 h, after cooling, washing with distilled water until no citric acid exists in the lotion, to obtain citric acid palm bark; ...

Embodiment 3

[0030](1) Palm bark pretreatment: Wash the palm bark with water to remove soil and impurities, put it in a container and soak it in water for 7 days to remove non-fibrous substances, cut the palm bark into small pieces, wash with water, and vacuum dry Pulverize, sieve with 20 mesh sieves, obtain pretreatment palm bark;

[0031] (2) Alkaline treatment of palm bark: Soak the pretreated palm bark with 8% NaOH aqueous solution for 12 hours, boil for 15nm, wash with deionized water after cooling until neutral, and dry at 120°C after suction filtration dry, to obtain alkalized palm bark;

[0032] (3) Preparation of citric acid palm bark: In a reactor, mix alkalized palm bark and 8% by mass citric acid solution at a ratio of 1g:15mL, react at room temperature for 60nm, raise the temperature to 60°C, and react for 36 h, heating up to 125°C, reacting for 1.5 h, after cooling, washing with distilled water until there is no citric acid in the lotion, to obtain citric acid palm bark;

...

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Abstract

The invention discloses a preparation method and an application technology of a citric acid modified palm tree bark adsorbing agent. The preparation method is characterized by comprising the following steps of: washing palm tree bark by water to remove mud and impurities, drying and crushing the washed palm tree bark, mixing the crushed palm tree bark with a 8%-20% citric acid solution according to the proportion of 1g: 5ml-15ml after the palm tree bark is dried by a NaOH aqueous solution, reacting the mixture for 35-60 minutes at room temperature, heating the reacted mixture to 50-60 DEG C, reacting the heated mixture for 24-36 hours, heating the reacted mixture to 120-130 DEG C, reacting the heated mixture for 1-2 hours, cooling the reacted mixture, washing the cooled mixture with distilled water until no citric acid exists in washing liquid, mixing the washing liquid with a 10%-20% magnesium chloride solution according to the proportion of 1g: 5ml-12ml, reacting the mixture at room temperature, performing suction filtration on the reacted mixture, washing the filtered mixture with a 5%-10% magnesium chloride solution, and finally, baking washing liquid to obtain the citric acid modified palm tree bark adsorbing agent. The adsorbing agent has high adsorption capacity to basic dye, good physical and chemical properties, high mechanical stability and strong regeneration capacity, and is recyclable, low in cost and environment-friendly.

Description

technical field [0001] The invention relates to a preparation method of a biological adsorbent and the technical field of application of dye adsorption in industrial wastewater, in particular to a preparation method and application technology of a citric acid-modified palm bark adsorbent. Background technique [0002] With the rapid development of industry, the amount of dyes is also increasing. Compared with natural dyes, synthetic dyes have the advantages of convenient use, stable properties, low cost, and many varieties, and are widely used in textile, paper, pharmaceutical and food industries. . Dye wastewater has become one of the main polluted wastewater in our country at present, and it is very urgent to solve the problem of environmental pollution. At present, the structures of most synthetic dyes have complex aromatic ring structures, which are very stable and difficult to biodegrade. These dyes will pose a threat to human health, enter the food chain, and may cau...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F103/30
Inventor 李慧芝许崇娟江川
Owner UNIV OF JINAN
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