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Preparation and application of palygorskite/Zn-Mg-Cr ternary metal oxide composite photocatalyst

A zn-mg-cr, ternary metal technology, used in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, heterogeneous catalyst chemical elements, etc., can solve the problem that the adsorption capacity cannot be simultaneously Reach the maximum, it is difficult to meet the emission requirements, the number of active adsorption sites of the material is limited, etc., to achieve the effect of good removal capacity

Inactive Publication Date: 2019-07-12
NORTHWEST NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the treatment of dye wastewater mainly includes membrane separation, chemical coagulation, biological treatment and other methods, but this type of treatment has disadvantages such as high treatment cost, unstable technical operation, and secondary pollution.
Although the adsorption method is simple, convenient, efficient and low-cost, in most cases dye wastewater contains not only dyes, nitro substances, amines and phenols, but also heavy metals such as mercury, cadmium and copper, which are organic pollutants, For metal ion coexistence, if only materials with adsorption capacity are used to treat wastewater, the number of active adsorption sites of materials is limited, and the adsorption capacity for metal ions and organic pollutants cannot be maximized at the same time, and it is difficult to meet the discharge requirements

Method used

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  • Preparation and application of palygorskite/Zn-Mg-Cr ternary metal oxide composite photocatalyst
  • Preparation and application of palygorskite/Zn-Mg-Cr ternary metal oxide composite photocatalyst
  • Preparation and application of palygorskite/Zn-Mg-Cr ternary metal oxide composite photocatalyst

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Experimental program
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Effect test

Embodiment 1

[0026] 1.3630 g ZnCl 2 , 0.2033g MgCl 2 and 0.2664 g CrCl 3 Add to 150 mL of deionized water, add 0.80 g palygorskite, stir to dissolve, then use 1.5 M NaOH and 1.25 M Na 2 CO 3 Adjust the pH of the solution to 9 with the mixed solution, move it to a hydrothermal reaction kettle at 110~130°C and keep it for 20~24 h, wait until the reaction kettle is cooled to room temperature, filter, wash the precipitate several times with deionized water, and dry; Then it was calcined at 500℃ for 4~6 h to obtain 10%PGS / Zn-Mg-Cr LDO (14:2:2.6) composite catalyst.

[0027] In this composite catalyst, ZnO, MgO, Cr 2 o 3 The mass ratio is 13.5:6.6:8.5, and the content of PGS in the composite catalyst is 10%.

Embodiment 2

[0029]Weigh 20 mg of 10% PGS / Zn-Mg-Cr LDO (14:2:2.6) prepared in Example 1, add it to 30 mL of 10 mg / L malachite green solution, and stir for 30 min in the dark to achieve adsorption-desorption After measuring the concentration of the solution in equilibrium, a 300 W xenon lamp was used to simulate a visible light source, and the concentration of the solution was measured every 10 minutes. After irradiating for 70 minutes, according to D% = ( C 0 - C t ) / C 0 *100% calculated photodegradation rate of malachite is 97.7%.

Embodiment 3

[0031] Weigh 20 mg 10%PGS / Zn-Mg-Cr LDO (14:2:2.6) and add to 10 mL 100 mg / L Pb 2+ solution, shake at room temperature for 60 min, measure the solution concentration, according to D% = ( C 0 - C t ) / C 0 *100% calculation of Pb 2+ The adsorption rate was 98.3%.

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Abstract

The invention provides a preparation method of a palygorskite / Zn-Mg-Cr ternary metal oxide composite photocatalyst. The preparation method is as follows: dissolving ZnCl2, MgCl2, CrCl3 in water, adding palygorskite and performing uniform stirring, and adjusting the solution pH with an alkali solution to be 8-10; then transferring the mixed solution into a hydrothermal reaction kettle, and maintaining for 20-24 h at 110-130 DEG C; performing washing with water on the obtained precipitate and performing drying to obtain palygorskite / ternary metal hydroxide; and performing calcination on the palygorskite / ternary metal hydroxide for 4-6 h at 400-600 DEG C to obtain the palygorskite / Zn-Mg-Cr ternary metal oxide composite photocatalyst. The composite photocatalyst can photo-catalytically degrademethylene blue, rhodamine B, crystal violet, malachite green and other dyes, and can adsorb heavy metal ions Pb<2+>, Cu<2+>, Ni<2+> and acid fuchsin dye in water, so that the composite photocatalystcan be used for the treatment of dye wastewater and heavy metal wastewater.

Description

technical field [0001] The invention relates to a preparation method of palygorskite / ternary metal oxide catalyst, in particular to a preparation method of palygorskite / Zn-Mg-Cr ternary metal oxide composite catalyst, which is mainly used for the treatment of dye wastewater , belonging to the field of composite materials and the field of sewage treatment. [0002] technical background [0003] The chemical industry has played an important role in promoting human social and economic development and improving human life, but with its rapid development, it has also caused more prominent environmental pollution problems, especially water pollution. Among them, dye pollution is an important source of water pollution. At present, the treatment of dye wastewater mainly includes membrane separation, chemical coagulation, biological treatment and other methods, but this kind of treatment has the disadvantages of high treatment cost, unstable technical operation, secondary pollution a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/26C02F1/30C02F101/20C02F101/30
CPCB01J23/002B01J23/26C02F1/30B01J2523/00C02F2305/10C02F2101/308C02F2101/20B01J35/39B01J2523/22B01J2523/27B01J2523/67
Inventor 常玥李梦佳李小妹唐清海査飞
Owner NORTHWEST NORMAL UNIVERSITY
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