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Hexavalent chromium adsorbent and preparation method and application thereof

An adsorbent, hexavalent chromium technology, applied in chemical instruments and methods, adsorbed water/sewage treatment, other chemical processes, etc., can solve the problems of chromium pollution in natural water and soil, pollution of the environment, waste of resources, etc., to achieve the scope of application Wide, high adsorption efficiency, low cost effect

Active Publication Date: 2016-12-07
NORTHEAST AGRICULTURAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In my country's electroplating industry, less than 30% of enterprises have completely treated wastewater. On the one hand, a large amount of toxic chromium enters natural water bodies. On the other hand, a large amount of chromium in wastewater is deposited in sludge, and most of these sludge are placed around farmland in the countryside. Nearly 10% of the sludge is applied to farmland, which causes chromium pollution in natural water bodies and soil, and then transfers to the human body through plants and animals, which is extremely harmful
[0004] my country's edible fungus industry is developing rapidly. Fungus chaff is the waste substrate after harvesting edible fungi. The annual output of fungus chaff in my country is nearly 70 million tons, but most of the fungus chaff is piled up or burned, which wastes resources and pollutes the environment.

Method used

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  • Hexavalent chromium adsorbent and preparation method and application thereof
  • Hexavalent chromium adsorbent and preparation method and application thereof
  • Hexavalent chromium adsorbent and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 6

[0039] The preparation of embodiment 1 hexavalent chromium adsorbent

[0040] The preparation of hexavalent chromium adsorbent is carried out according to the following method:

[0041] (1) Pretreatment of bacterial chaff

[0042] Put the fungus chaff into a constant temperature drying incubator, dry at 80°C until constant weight, pulverize, and pass through a 40-mesh sieve. The sieved fungus bran powder was sterilized by high-pressure steam at 121°C, and stored in a dry environment for later use ( figure 1 ).

[0043] (2) Modification of bacterial chaff - grafting cationic groups

[0044]Choose hexadecyltrimethylammonium bromide as the modifier, take 0.34g of hexadecyltrimethylammonium bromide at 25°C, add 1L of deionized water, stir until completely dissolved, and make 1CMC critical For a solution with a micellar concentration, add 100g of fungus chaff powder to the solution, put it in a shaker, set it at 150r / min, modify it for 24 hours, filter it, wash it with deionize...

Embodiment 2

[0048] Embodiment 2 Application of adsorbent of the present invention in static adsorption of hexavalent chromium

[0049] 1. Method

[0050] According to the dosage of 0.5~5g / L, the hexavalent chromium adsorbent prepared in Example 1 is added to pH (2~8), and the hexavalent chromium ion concentration is 25~150mg / L in the waste water, in 15~ Under the condition of 35°C, on a shaker with a rotating speed of 60-180r / min, shake the adsorption for 0.5-5h, filter and remove the adsorbent, measure different pH (2-8), different initial concentration (25-150mg / L), different adsorption Dosing amount of agent (0.5~5g / L), different adsorption time (30~300min), different temperature (15~35℃), different speed (60~180r / min) on the adsorption effect. After the adsorption, the atomic absorption spectrophotometer measures the hexavalent chromium content in the filtrate. Calculate the adsorption rate R. The adsorption rate (%) is calculated according to the following formula:

[0051] ...

Embodiment 3

[0059] Example 3 Static adsorption efficiency comparison of unmodified bacterial chaff and modified bacterial chaff adsorbent for hexavalent chromium

[0060] Take the bacteria chaff adsorbent before modification and after modification according to the dosage of 3g / L, under the conditions of pH 5.5, initial concentration of hexavalent chromium 100mg / L, adsorption time 120min, temperature 25°C, speed 150r / min respectively Determination of adsorption capacity and adsorption rate, the results are shown in Table 1. It can be seen from Table 1 that the removal rate of hexavalent chromium by the modified fungus chaff adsorbent is increased by 16.3%, and the adsorption capacity is increased by 5.4mg / g.

[0061] Table 1

[0062]

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Abstract

The invention discloses a hexavalent chromium adsorbent and a preparation method and application thereof, and belongs to the technical field of environmental protection. According to the hexavalent chromium adsorbent and the preparation method and application thereof, edible fungus waste matrix-fungus chaff serves as the material, the advantages that the fungus chaff is loose and porous, large in specific surface area and rich in active group are utilized, and the fungus chaff is modified and prepared into an anion adsorbent and used for adsorbing hexavalent chromium which exists in an anionic form in electroplating wastewater. The fungus chaff modified adsorbent is used for treating hexavalent chromium wastewater, and on the condition that the pH is 5.5, the initial concentration of hexavalent chromium is 100 mg / L, the dosage of the adsorbent is 3 g / L, the adsorption time is 120 min, the temperature is 25 DEG C, and the rotating speed is 150 r / min, the adsorption quantity can reach 31.5 mg / g. The hexavalent chromium adsorbent and the preparation method and application thereof have the main advantages that agricultural solid waste resource recovery is achieved, contamination of waste fungus chaff to environment is reduced, the fungus chaff is applied to water pollution treatment simultaneously, resource utilization of agricultural solid waste is achieved, and the hexavalent chromium adsorbent has the advantages of being wide in material resource, low in preparation cost, easy to operate, high in adsorption efficiency and the like and can be widely applied to treatment of industrial wastewater in electroplating, printing and dyeing, tanning, metallurgy and the like.

Description

technical field [0001] The present invention relates to a hexavalent chromium adsorbent and its preparation method and application, in particular to an adsorbent made by pretreatment of mushroom chaff wastes harvested from edible fungi, and also to a preparation method of the adsorbent and Its use in the biological adsorption treatment of low-concentration heavy metal polluted wastewater. The invention belongs to the technical field of environmental protection. Background technique [0002] With the development of my country's economy and the continuous expansion of development scale, heavy metal pollution is becoming more and more serious. There are nearly 10,000 electroplating enterprises in my country, covering 33 major categories of national economic industries involving hexavalent chromium, 130 medium industries, and 267 small industries, covering all provinces, autonomous regions and municipalities directly under the central government. The electroplating industry pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F101/22
CPCB01J20/24C02F1/286C02F2101/22
Inventor 金羽曲娟娟戴航宇臧婷婷董莉莹
Owner NORTHEAST AGRICULTURAL UNIVERSITY
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