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Manganese oxide diatomite composite adsorbent for treating lead-containing wastewater and preparation method thereof

A manganese oxide diatomite, composite adsorption technology, applied in chemical instruments and methods, water/sewage treatment, adsorbed water/sewage treatment, etc., can solve the problems of decreased adsorption efficiency, difficult diffusion of reaction medium, and easy to reduce the use effect. , to achieve the effect of solving the phenomenon of agglomeration and solving the difficulty of recycling

Inactive Publication Date: 2014-10-01
沈阳东大新材料有限公司
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Problems solved by technology

The paper once disclosed a preparation method of nanometer hydrated manganese oxide (Su, Q., Pan, B., Wan, S., Zhang, W., & Lv, L. (2010). Use of hydrous manganese dioxide as a potential sorbent for selective removal of lead, cadmium, and zinc ions from water. Journal of colloid and interface science , 349(2), 607–12. doi:10.1016 / j.jcis.2010.05.052), although this nanomaterial has a high removal ability for lead ions, due to the insurmountable agglomeration tendency of nanomaterials, the It is easy to reduce its use effect in the actual application process
[0004] A widely accepted and applied method to solve the problem of nano-adsorbent agglomeration is to combine nano-adsorbents with natural porous materials. The Chinese patent application number 200610008135.8 "Preparation of an iron-manganese composite oxide / diatomite adsorbent , use and regeneration method" discloses that diatomite is added to the preparation solution of iron-manganese composite oxide and shaken for 30-60 minutes, then aged, washed with water, and dried to obtain a composite material adsorbent for the treatment of arsenic pollutants in water ; Application No. 200810025795.6 Chinese patent "for removing Cr in water 6+ The preparation method of the nano-magnetite / diatomite composite" discloses that diatomite powder is added to the iron salt solution, and then the pH value of the reaction solution is controlled so that iron oxide can be generated in the pores of diatomite for The core of this technology is to introduce natural porous materials in the process of preparing nano-adsorbents, control the synthesis and preparation conditions to make nano-materials nucleate and grow in the pores of porous materials, and Finally, the nano-adsorbent cannot be agglomerated. However, since the porous material as the matrix does not participate in the reaction, the mechanism of the growth of the nano-adsorbent in the pores of the porous material is the same. Further, due to the diffusion of the reaction medium in the pores of the porous material Difficulty, it will lead to more materials formed directly outside the pore structure of porous materials, and this part of the materials still faces the problem of agglomeration during the application process, resulting in a decrease in adsorption efficiency

Method used

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  • Manganese oxide diatomite composite adsorbent for treating lead-containing wastewater and preparation method thereof
  • Manganese oxide diatomite composite adsorbent for treating lead-containing wastewater and preparation method thereof
  • Manganese oxide diatomite composite adsorbent for treating lead-containing wastewater and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] (1) Disperse 20 g of diatomaceous earth into 100 ml of glucose solution with a mass concentration of 5%, stir for 30 minutes, then filter, dry the obtained solid in an oven at 120°C for 5 hours, and place it in a nitrogen atmosphere furnace, Calcined at 600°C for 2 hours;

[0026] (2) Add the calcined product to a potassium permanganate solution with a concentration of 60 g / L and heat it with microwave for 15 minutes. The amount of the calcined product added is 35 g / L potassium permanganate solution, and the microwave power is controlled at 1kW;

[0027] (3) The product after microwave heat treatment is collected by filtration, washed and dried to obtain a manganese oxide diatomite composite adsorbent whose composition is 5% manganese oxide and 95% diatomite by mass percentage.

[0028] The low-magnification and high-magnification scanning electron microscope morphologies are as follows: figure 1 with figure 2 As shown, it can be seen that the oxides are evenly dist...

Embodiment 2

[0031] (1) Disperse 25g of diatomaceous earth into 100ml of soluble starch solution with a mass concentration of 2%, stir for 5 minutes, then filter, dry the obtained solid in an oven at 120°C for 5 hours, place it in a vacuum oven, and Calcined at 400°C for 5 hours;

[0032] (2) Add the calcined product to a potassium permanganate solution with a concentration of 100 g / L and heat it with microwave for 5 minutes. The amount of the calcined product added is 10 g / L potassium permanganate solution, and the microwave power is controlled at 4k W;

[0033] (3) The product after microwave heat treatment is collected by filtration, washed and dried to obtain a manganese oxide diatomite composite adsorbent whose composition is 20% manganese oxide and 80% diatomite by mass percentage.

[0034]Put the manganese oxide diatomite composite adsorbent prepared in this example into the lead ion solution with an initial concentration of 80 mg / L at a dosage of 1.5 g / L, and the adsorption kinetic...

Embodiment 3

[0036] (1) Disperse 30g of diatomaceous earth into 100ml of sucrose solution with a mass concentration of 10%, stir for 2 hours, then filter, dry the obtained solid in an oven at 120°C for 5 hours, place it in a nitrogen atmosphere furnace, and Calcined at 800°C for 30 minutes;

[0037] (2) Add the calcined product to a potassium permanganate solution with a concentration of 50 g / L and heat it with microwave for 60 minutes. The amount of the calcined product added is 75 g / L potassium permanganate solution, and the microwave power is controlled at 500 W;

[0038] (3) The product after microwave heat treatment is collected by filtration, washed and dried to obtain a manganese oxide diatomite composite adsorbent whose composition is 40% manganese oxide and 60% diatomite by mass percentage.

[0039] Put the manganese oxide diatomite composite adsorbent prepared in this example into lead ion solutions with different initial concentrations at a dosage of 1 g / L, and its adsorption is...

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Abstract

The invention belongs to the technical field of composite materials, and specifically relates to a manganese oxide diatomite composite adsorbent for treating lead-containing wastewater and a preparation method. The composite adsorbent of the present invention consists of 5-40% manganese oxide and 60-95% diatomite in terms of mass percentage. Its preparation method is to disperse diatomite into a soluble low-chain organic solution, stir and then filter. Calcined at 400-800°C, the calcined product is added to a potassium permanganate solution for microwave heating for 5 to 60 minutes. The product after microwave heat treatment is collected by filtration, washed and dried to obtain a manganese oxide diatomite composite adsorbent. The manganese oxide diatomite composite adsorbent prepared by the method of the present invention can effectively remove lead ions in sewage and wastewater, and can adsorb more than 98% of a 60 mg / L lead solution in one hour.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a manganese oxide diatomite composite adsorbent for treating lead-containing wastewater and a preparation method thereof. Background technique [0002] Lead is a toxic heavy metal that is widely used in industry. A large amount of lead-containing wastewater is produced in electroplating, metallurgy, chemical and other industries. If it is directly discharged into the natural environment without treatment, lead will be in the water body or in the corresponding organisms. It is enriched and finally enters the human body through the food chain, causing great poisonous effects. There are many technical means to eliminate lead ions in industrial wastewater discharge, including ion exchange, chemical precipitation, membrane method, electrolysis and adsorption. Among them, the adsorption method is one of the most effective methods for treating heavy metal ion po...

Claims

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Application Information

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IPC IPC(8): B01J20/14B01J20/30C02F1/28C02F1/62
Inventor 秦高梧李松秦耀坤任玉平左良
Owner 沈阳东大新材料有限公司
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