Method for preparing cadmium ion adsorbent in water through wheat straws subjected to combined pretreatment based on dilute sulfuric acid and DDBAC (Dodecyldimethyl Ammonium Chloride)

A technology of wheat straw and dilute sulfuric acid, applied in chemical instruments and methods, water/sewage treatment, adsorption water/sewage treatment, etc., can solve the problem of unsatisfactory adsorption capacity of original straw, and achieve low cost, good effect, and simple raw materials Easy to get effect

Inactive Publication Date: 2018-05-04
HUNAN UNIV
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Problems solved by technology

However, due to the unsatisfactory adsorption capacity of the original straw, how to improve its adsorption efficiency through different pretreatment methods has become a research hotspot.

Method used

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  • Method for preparing cadmium ion adsorbent in water through wheat straws subjected to combined pretreatment based on dilute sulfuric acid and DDBAC (Dodecyldimethyl Ammonium Chloride)
  • Method for preparing cadmium ion adsorbent in water through wheat straws subjected to combined pretreatment based on dilute sulfuric acid and DDBAC (Dodecyldimethyl Ammonium Chloride)

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Embodiment

[0022] The wheat straw was selected for a series of pretreatments and the adsorption concentration of Cd(NO) was 15mg / L. 3 ) 2 Solution. The specific steps are as follows: (1) Cut the wheat straw into 1-3 cm sections, wash with deionized water, and bake at 80°C for 24 hours. After crushing through a 100-mesh sieve, save for later use.

[0023] (2) Prepare sulfuric acid with a mass fraction of 2%, measure 100 mL, weigh 10 g of the wheat straw treated in (1), mix the two in a 250 mL beaker, soak the straw completely in sulfuric acid, and soak at 25°C for 24 hours. Then shake for 2h, wash with deionized water until the pH is neutral, add 200mL 2.5mmol / L double DDBAC solution after drying, and treat for 3h.

[0024] (3) Take out the pretreated wheat straw, rinse with deionized water until the pH is neutral, and bake at 80°C for 12 hours.

[0025] (4) Weigh 0.5g of the above-mentioned pretreated straw and add it to 50mL 15mg / L Cd(NO 3 ) 2 In the solution, the adsorption reaction is carr...

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Abstract

The invention discloses a method for preparing a cadmium ion adsorbent in water through wheat straws subjected to combined pretreatment based on dilute sulfuric acid and DDBAC (Dodecyldimethyl Ammonium Chloride) and belongs to the technical field of waste recycling and wastewater treatment. The method disclosed by the invention comprises the following steps: (1) physically treating wheat straws; (2) chemically treating the wheat straws; (3) cleaning; and (4) performing an adsorption experiment. The method is simple and readily available in raw materials, economical and high in efficiency, hashigh efficiency of adsorbing and removing cadmium ions in the water, does not cause secondary pollution, has wide prospects in the field of treatment of heavy metal polluted wastewater, and can achieve an aim of recycling the wastes.

Description

Technical field [0001] The invention belongs to the technical field of waste recycling and wastewater treatment, and specifically relates to a method for preparing a cadmium ion adsorbent in a water body based on the combined pretreatment of dilute sulfuric acid and DDBAC of wheat straw. Background technique [0002] Cadmium is a common harmful heavy metal. Under natural circumstances, water usually contains a certain concentration of cadmium, which mainly comes from the weathering of soil and the leaching of rocks. Cadmium pollution in water bodies is mainly due to human activities, including large amounts of cadmium-containing wastewater produced by cadmium-related industries such as metal smelting, electroplating, batteries, printing and dyeing, etc.; the use of many types of fertilizers and pesticides; the burning of fossil fuels and daily life The random stacking of certain wastes generated in the cadmium may introduce cadmium into the water environment and cause pollution....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/22C02F1/28C02F101/20
CPCB01J20/22B01J20/24C02F1/286C02F2101/20
Inventor 杨春平吴梦洁刘红玉曾光明吴彬李惠茹周琦邬鑫
Owner HUNAN UNIV
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