Preparation method for multifunctional coupled PAC/Bi2O3/TiO2 composite material

Abstract

The invention discloses a preparation method for a multifunctional coupled PAC / Bi2O3 / TiO2 composite material, belonging to the field of water treatment. The preparation method comprises the followingsteps: slowly adding tetrabutyl titanate and glacial acetic acid into absolute ethyl alcohol so as to obtain a solution A, fully dissolving bismuth nitrate pentahydrate into deionized water so as to obtain a solution B, and dropwise adding the solution B into the solution A so as to form a sol; adding powdered active carbon into the sol, and carrying out immersing for 5-8 hours; transferring the immersed sol into a hydrothermal reaction kettle, carrying out a hydrothermal reaction for 12-18 hours, then taking an obtained material out of the hydrothermal reaction kettle, pouring the material into an evaporation boat, carrying out drying in a drying oven, and grinding a dried material into powder; and putting the powder into a tubular furnace, carrying out heat treatment for 2 hours at 300 DEG C in an air atmosphere, and carrying out heat treatment for 3 hours at 500-750 DEG C in a nitrogen or argon atmosphere. The composite material prepared by using the method disclosed by the invention can effectively reduce the mass loss of PAC, continuously degrades pollutants through visible light catalytic oxidation, realizes dynamic unsaturated adsorption and in-situ regeneration of the PAC at the same time, and synchronously completes the coupling effect of pollutant adsorption, visible light catalytic oxidation and in-situ regeneration.

Description

technical field [0001] The invention belongs to the field of water treatment and relates to a multifunctional coupled PAC / Bi 2 o 3 / TiO 2 Composite material preparation method, prepared PAC / Bi 2 o 3 / TiO 2 The composite material has the coupling function of adsorption / visible light catalytic oxidation / in situ regeneration. Background technique [0002] In recent years, the problem of water pollution has become increasingly prominent, and many pollutants are difficult to be effectively removed by conventional purification technologies. With the advancement of high-tech and the development of material science, new decontamination technologies and materials have been continuously developed and applied. Photocatalytic oxidation technology and photocatalytic semiconductor materials have the characteristics of green energy saving, controllable operating conditions, mild reaction conditions, and strong organic oxidation ability. At present, the research and development and a...

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Problems solved by technology

[0003] Titanium dioxide (TiO2) is a highly efficient photocatalytic oxidant, which has the advantages of non-toxicity, high photocatalytic activity and high stability. It has been deeply researched and widely used, but there are still problems such as only using ultraviolet light, low degradation reaction rate, easy agglomeration and difficult recycling.

Powdered activated carbon (PAC), which is widely used in water treatment processes, has a well-developed pore structure and good adsorption performance, but PAC has problems such as easy adsorption saturation, frequent replacement, and regular regeneration, complicated recycling process, and high regeneration costs.

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