Method for treating chrome-containing wastewater by catalytic reduction of petaloid magnetic iron oxide/molybdenum sulfide composite

A technology of magnetic iron oxide and molybdenum sulfide, applied in reduced water/sewage treatment, chemical instruments and methods, chemical/physical processes, etc., can solve problems such as hazards and carcinogenicity, and achieve high photocatalytic removal rate, low cost, and high potential The effect of industrial application value

Inactive Publication Date: 2015-08-12
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chromium-containing wastewater is difficult to be biodegraded after being discharged into the water

Method used

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  • Method for treating chrome-containing wastewater by catalytic reduction of petaloid magnetic iron oxide/molybdenum sulfide composite
  • Method for treating chrome-containing wastewater by catalytic reduction of petaloid magnetic iron oxide/molybdenum sulfide composite
  • Method for treating chrome-containing wastewater by catalytic reduction of petaloid magnetic iron oxide/molybdenum sulfide composite

Examples

Experimental program
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Effect test

Embodiment 1

[0045] A method for catalytic reduction of petal-shaped magnetic iron oxide molybdenum sulfide complex of the present invention to treat chromium-containing wastewater comprises the following steps in turn: (1) at room temperature, take an appropriate amount of ferrous sulfate heptahydrate and dissolve it in 10-20 ml of deionized water , stirred until transparent to obtain solution 1; (2) at room temperature, take an appropriate amount of sodium chlorate and dissolve it in 15-25 ml of deionized water, stir until transparent to obtain solution 2; (3) keep the concentrations of solutions 1 and 2 at 0.3-2 0.7mol L -1 And 0.1~0.3mol L -1 ; (4) under magnetic stirring, add solution 2 dropwise to solution 1 until the solution appears light yellow; (5) then transfer the above mixed solution to an autoclave, and react at 150-200°C for 10-20 hours; (6) react Afterwards, centrifuge to remove unreacted substances, impurities and water to obtain iron oxide, dry it at 60-75°C and grind it...

Embodiment 2

[0048] A method for catalytic reduction of petal-shaped magnetic iron oxide molybdenum sulfide complex of the present invention to treat chromium-containing wastewater comprises the following steps in turn: (1) at room temperature, take an appropriate amount of ferrous sulfate heptahydrate and dissolve it in 10-20 ml of deionized water , stirred until transparent to obtain solution 1; (2) at room temperature, take an appropriate amount of sodium chlorate and dissolve it in 15-25 ml of deionized water, stir until transparent to obtain solution 2; (3) keep the concentrations of solutions 1 and 2 at 0.3-2 0.7mol L -1 And 0.1~0.3mol L -1 ; (4) under magnetic stirring, add solution 2 dropwise to solution 1 until the solution appears light yellow; (5) then transfer the above mixed solution to an autoclave, and react at 150-200°C for 10-20 hours; (6) react Afterwards, centrifuge to remove unreacted substances, impurities and water to obtain iron oxide, dry it at 60-75°C and grind it...

Embodiment 3

[0051] A method for catalytic reduction of petal-shaped magnetic iron oxide molybdenum sulfide complex of the present invention to treat chromium-containing wastewater comprises the following steps in turn: (1) at room temperature, take an appropriate amount of ferrous sulfate heptahydrate and dissolve it in 10-20 ml of deionized water , stirred until transparent to obtain solution 1; (2) at room temperature, take an appropriate amount of sodium chlorate and dissolve it in 15-25 ml of deionized water, stir until transparent to obtain solution 2; (3) keep the concentrations of solutions 1 and 2 at 0.3-2 0.7mol L -1 And 0.1~0.3mol L -1 ; (4) under magnetic stirring, add solution 2 dropwise to solution 1 until the solution appears light yellow; (5) then transfer the above mixed solution to an autoclave, and react at 150-200°C for 10-20 hours; (6) react Afterwards, centrifuge to remove unreacted substances, impurities and water to obtain iron oxide, dry it at 60-75°C and grind it...

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Abstract

The invention relates to a method for treating chrome-containing wastewater by catalytic reduction of a petaloid magnetic iron oxide/molybdenum sulfide composite. The method comprises the following steps: weighing ferrous sulfate heptahydrate and sodium chlorate, dissolving in deionized water, stirring until the solution becomes light yellow, reacting in a high-pressure reaction kettle, carrying out centrifugal separation to obtain ferric oxide, drying, and pulverizing into powder; weighing the ferric oxide powder, molybdenum trisulphate dihydrate and thiocarbamide, dissolving in deionized water, stirring uniformly, transferring the mixture into a high-pressure reaction kettle, reacting, and carrying out centrifugal separation; cleaning with ethanol and deionized water; and drying to obtain the ferric oxide/molybdenum sulfide composite finished product, adding the finished product into hexavalent-chrome-containing wastewater with the initial concentration of 5-20 mg/L, stirring uniformly, irradiating with a metal halide lamp for more than 30 minutes, determining the hexavalent chrome concentration after treatment, and calculating the removal rate. The ferric oxide/molybdenum sulfide composite for treating hexavalent-chrome wastewater has the advantages of high removal rate and low treatment cost.

Description

technical field [0001] The invention relates to a method for catalytic reduction of petal-shaped magnetic iron oxide molybdenum sulfide compound to treat chromium-containing wastewater, belonging to the technical field of sewage treatment. Background technique [0002] The vigorous development of the metallurgical and mining industries has resulted in an increasing amount of wastewater containing heavy metal chromium being discharged into the environment, which poses a huge threat to the environment. Chromium-containing wastewater is difficult to be biodegraded after being discharged into water bodies, and it will cause potential harm to aquatic animals, plants and humans, and even cause cancer. [0003] The treatment methods of chromium-containing wastewater include: chemical precipitation, adsorption and photocatalysis. Photocatalytic technology is currently one of the main methods for treating chromium-containing wastewater, and its research hotspots mainly focus on the ...

Claims

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Application Information

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IPC IPC(8): C02F1/32C02F1/70C02F1/62B01J27/051C02F101/22
CPCY02W10/37
Inventor 王宏归张娅陈鹏温芳芳姜雅
Owner YANGZHOU UNIV
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