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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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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.

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
Comparison scheme
Effect test

Example Embodiment

[0024] Example 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 the potassium permanganate solution with a concentration of 60 g / L for 15 minutes and microwave heating treatment. The added amount of the calcined product is 35 g / L potassium permanganate solution, and the microwave power is controlled at 1kW;

[0027] (3) The product after microwave heat treatment is filtered and collected, washed and dried to obtain a manganese oxide diatomaceous earth composite adsorbent composed of 5% manganese oxide and 95% diatomaceous earth by mass percentage.

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

Example Embodiment

[0030] Example 2

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

[0032] (2) Add the calcined product to the potassium permanganate solution with a concentration of 100 g / L and microwave heating for 5 minutes. The added amount of the calcined product 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 filtered and collected, washed and dried to obtain a manganese oxide diatomaceous earth composite adsorbent composed of 20% manganese oxide and 80% diatomaceous earth by mass percentage.

[0034] Put the manganese oxide diatomaceous earth composite adsorbent prepared in this example in a lead ion solution with an initial concentration of 80 mg / L at a dosage of 1.5 g / L...

Example Embodiment

[0035] Example 3

[0036] (1) Disperse 30g of diatomaceous earth into 100ml of 10% sucrose solution by mass concentration, stir for 2 hours, 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 800°C for 30 minutes;

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

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

[0039] Put the manganese oxide diatomaceous earth composite adsorbent prepared in this example in a lead ion solution of different initial concentrations at a dosage of 1 g / L, and its adsorption iso...

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Abstract

The invention belongs to the technical field of composite materials, and particularly relates to a manganese oxide and infusorial earth composite adsorbent for treating lead-containing wastewater and a preparation method. The composite adsorbent comprises, in weight percent, 5-40% of manganese oxide and 60-95% of infusorial earth. The preparation method of the composite adsorbent includes the steps: dispersing the infusorial earth into soluble low-chain organic solution; stirring and filtering the solution; calcining the solution at the temperature of 400-800 DEG C; adding a calcined product into potassium permanganate solution and performing microwave heating for 5-60 minutes; and filtering, collecting, washing and drying the product after microwave heating to obtain the manganese oxide and infusorial earth composite adsorbent. By the aid of the manganese oxide and infusorial earth composite adsorbent prepared by the method, lead ions in wastewater can be effectively removed, and more than 98% of 60mg/L of lead solution can be adsorbed for 1 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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