Method for preparing Cu2O/Ca(OH)2 nano composite photocatalyst by interface reduction method

Abstract

The invention discloses a method for preparing a Cu2O / Ca(OH)2 nano composite photocatalyst by an interface reduction method. The method is characterized by comprising the following steps: uniformly mixing raw materials including water-soluble copper salt, glucose and solid calcium hydroxide in de-ionized water according to a mol ratio of (0.1-1) to 1 to 5; agitating at a room temperature for one hour to obtain turbid liquid; agitating and heating the turbid liquid at 60-90 DEG C for 0.5 hour; naturally cooling to room temperature to obtain a reaction product; and filtering, washing and carrying out vacuum drying on the reaction product to obtain the target product Cu2O / Ca(OH)2 nano composite photocatalyst. The method disclosed by the invention does not need to use any protection agent or surfactant, is simple to operate and is environment-friendly; the Cu2O / Ca(OH)2 nano composite photocatalyst is easy to separate and recycle and the difficulty of separating and recycling small Cu2O nano particles is overcome.

Description

technical field [0001] The invention relates to the technical fields of fine chemical industry and environmental protection, in particular, it is an interface reduction method for preparing Cu 2 O / Ca(OH) 2 Nanocomposite photocatalysts. Background technique [0002] As a typical p-type semiconductor material, Cu 2 O is known as the "all-round star" in the material industry due to its wide range of applications. It can be used as solar cells, Li-ion batteries, CO oxidation, and biosensors, etc. In addition, due to its narrow bandgap (2.2eV) and appropriate energy level position, Cu 2 O can also be used as a visible light photocatalyst to split water to produce hydrogen or degrade organic pollutants. In fact, Cu 2 O has many advantages as a photocatalyst. On the one hand, compared with traditional photocatalysts (such as TiO 2 , ZnO, etc.), it can make good use of the visible light energy in sunlight. On the other hand, compared with some other photocatalysts, it also h...

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Problems solved by technology

However, the preparation of nanoparticles by the liquid phase method also has its disadvantages. For example, nanoparticles are prone to agglomeration. Generally, surfactants need to be added to control their particle size. For example, Huang et al. Reduced Cu 2+ , and using CTAB as a surfactant, successfully prepared Cu 2 O nanoribbons; Gou et al. 2 SO 4 , sodium ascorbate and NaOH were used as raw materials, and CTAB was also used as a protective agent to synthesize Cu 2 O nanocube, Tang et al. successfully synthesized Cu with ethanol as reducing agent and PVP as surfactant 2 O nanocubes; M.Kooti et al. successfully prepared Cu with a particle size of about 30nm by using glucose reduction film reagent and using SLES or Triton X-100 as a surfactant. 2 O nanoparticles

Adding surfactants increases the cost of the reaction on the one hand, and also complicates the subsequent separation and purification process, and the remaining surfactants will further cause environmental pollution

Another disadvantage of the liquid phase method is that due to the small particle size of the prepared product, it is generally necessary to use a high-speed centrifuge for separation by centrifugation, which also complicates the reaction process.

Therefore, the preparation of nano-Cu by liquid phase method 2 O still faces many challenges

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