A WO3(H2O) for water treatment 0.5 Preparation method of h-WO3 heterostructure material

Abstract

The present invention relates to a WO3(H2O) for water treatment 0.5 Preparation of h-WO3 heterogeneous structure materials: Specifically, H2WO4 was dispersed in commercial hydrogen peroxide (mass fraction 30%), and then NaNO3 was added, mixed and heated to obtain WO3(H2O) 0.5 / h‑WO3 heterostructure material; the WO3(H2O) 0.5 Application of / h‑WO3 heterostructure materials in water treatment reactions.

Description

Technical Field

[0001] The present invention relates to a WO3(H2O) for water treatment 0.5 The invention discloses a preparation method of a / h-WO3 heterogeneous structure material, belonging to the field of material preparation and application. Background Art

[0002] With the rapid development of modern industry, industrial enterprises discharge a large amount of wastewater into rivers, and the resulting environmental pollution affects the normal life of human beings. At present, the use of efficient methods to effectively remove organic pollutants in water resources has become a hot topic of concern in human society. In 1972, Fujishima A and Honda K published an article in the journal Nature, "Electrochemical photolysis of water at asemiconductor electrode", and found that TiO2 materials can photocatalytically decompose water using near-ultraviolet light (Nature, 1972, 238, 37-38). This technological change has opened up a new field of solar-driven water decomposition. Humans continue to promote the application of photocatalysis in the environmental field, especially the photocatalytic degradation of organic pollutants.

[0003] WO3-based materials exhibit good photocatalytic performance due to their semiconductor properties. For example, Zhang's team used high-temperature calcination of hydrated ammonium tungstate to obtain h / m-WO3 material, which was used as a catalyst to irradiate RhB with a concentration of 10 mg / L under a 300W Xe lamp. The degradation efficiency reached 90% after 180 minutes (Materials Research Bulletin, 2020, 121, 110614). Zhou's team used hydrated sodium tungstate, dicyandiamide, and glucose to hydrothermally react at 200°C for 20 hours, and then calcined at 550°C for 3 hours to obtain a WO3 / g-C3N4 complex; it can effectively photocatalytically degrade tetracycline hydrochloride and ceftriaxone sodium (Applied Catalysis B: Environmental, 2018, 220, 417-428). Chen's group hydrothermally heated Na2WO4·2H2O, nitric acid, and carbon materials at 140°C for 24 hours to produce C-WO3·0.33H2O. Under visible light irradiation with 10 mg / L of RhB, the degradation efficiency reached 100% after 170 minutes (Applied Surface Science, 2016, 362, 182-190). Nilofar A's group calcined a mixture of WCl6, ammonia, and CTAB at 500°C for 2 hours to produce WO3 nanoparticles. They then mixed WO3 with p-toluenesulfonic acid, pyrrole, (NH4)2S2O8, and TiO2 to produce a WO3 / TiO2 composite. This composite was then photocatalytically degraded into methylene blue, achieving a 100% degradation rate in 120 minutes (Journal of Porous Materials, 2016, 23:629-637). These studies demonstrate the potential of photocatalytic technology for removing organic pollutants, demonstrating its simplicity and mild conditions, making it a promising technology for widespread application. The n-type semiconductor WO3 can be excited to electrons under light conditions and can effectively react with organic pollutants.

[0004] Therefore, WO3(H2O) 0.5 The synthesis of h-WO3 heterogeneous structure materials forms free radicals under light conditions, effectively removing difficult-to-degrade organic pollutant molecules, and ultimately turning sewage into usable water, which has important theoretical and practical significance. Summary of the Invention

[0005] The present invention aims to provide a WO3(H2O) for water treatment 0.5 Preparation method of / h-WO3 heterostructure material.

[0006] Based on the above objectives, the technical solutions involved in the present invention are as follows:

[0007] (1)WO3(H2O) 0.5Preparation of h-WO3 heterostructure material: Disperse 0.2g-0.36g of H2WO4 into 8-12mL of commercial hydrogen peroxide (mass fraction 30%), then add 1.8-2.4g of NaNO3, mix and heat at 100-125℃ for 20-40min to obtain WO3(H2O) 0.5 / h-WO3 heterogeneous structure material. The above preparation method, the h-WO3 belongs to the standard card JCPDS#33-1387, the WO3(H2O) 0.5 Belonging to the standard card JCPDS#84-1548, the WO3(H2O) 0.5 The / h-WO3 heterostructure material is a flower-like structure with a diameter of 1.4-3 μm, which is composed of nanosheets with a diameter of 15-30 nm.

[0008] (2) WO3(H2O) prepared by the above-mentioned preparation method 0.5 Application of / h-WO3 heterogeneous structure material in water treatment reaction; in dye wastewater, methylene blue is 0.1-1 mg / L, and the photocatalytic reaction takes 6-8 hours, with a removal rate of 100%.

[0009] The present invention has the following advantages:

[0010] 1) Provided WO3(H2O) 0.5 A new synthetic route for h-WO3 heterostructure materials.

[0011] 2) WO3(H2O) 0.5 / h-WO3 heterostructure materials exhibit high catalytic ability in photocatalytic methylene blue. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 WO3(H2O) 0.5 XRD and SEM characterization results of / h-WO3 heterostructure materials. DETAILED DESCRIPTION

[0013] The following examples are intended to further illustrate the present invention but are not intended to limit the present invention.

[0014] Example 1

[0015] WO3(H2O) 0.5 Preparation of h-WO3 heterostructure material: 0.2 g H2WO4 was dispersed in 8 mL of commercial hydrogen peroxide (mass fraction 30%), and then 1.8 g NaNO3 was added. After mixing, the mixture was heated at 100 ° C for 20 min to obtain WO3 (H2O) 0.5 / h-WO3 heterogeneous structure material. The above preparation method, the h-WO3 belongs to the standard card JCPDS#33-1387, the WO3(H2O) 0.5 Belonging to the standard card JCPDS#84-1548, the WO3(H2O) 0.5 / h-WO3 heterostructure material is a flower-like structure with a diameter of 1.4-2.8μm, which is composed of nanosheets with a diameter of 15-30nm. 0.5 / h-WO3 heterogeneous structure material is used for water treatment; in dye wastewater, methylene blue is 0.1 mg / L and the removal rate is 100% after photocatalytic reaction for 6 hours.

[0016] Example 2

[0017] WO3(H2O) 0.5 Preparation of h-WO3 heterostructure material: 0.36 g H2WO4 was dispersed in 12 mL commercial hydrogen peroxide (mass fraction 30%), and then 2.4 g NaNO3 was added. After mixing, the mixture was heated at 125 ° C for 40 min to obtain WO3 (H2O) 0.5 / h-WO3 heterogeneous structure material. The above preparation method, the h-WO3 belongs to the standard card JCPDS#33-1387, the WO3(H2O) 0.5 Belonging to the standard card JCPDS#84-1548, the WO3(H2O) 0.5 / h-WO3 heterostructure material is a flower-like structure with a diameter of 1.6-3μm, which is composed of nanosheets with a diameter of 18-30nm. 0.5 / h-WO3 heterogeneous structure material is used for water treatment; in dye wastewater, methylene blue is 1 mg / L and the photocatalytic reaction is carried out for 8 hours, with a removal rate of 100%.

[0018] Example 3

[0019] WO3(H2O) 0.5 Preparation of h-WO3 heterostructure material: 0.3 g H2WO4 was dispersed in 10 mL of commercial hydrogen peroxide (mass fraction 30%), and then 2 g NaNO3 was added. After mixing, the mixture was heated at 115 ° C for 30 min to obtain WO3 (H2O) 0.5 / h-WO3 heterogeneous structure material. The above preparation method, the h-WO3 belongs to the standard card JCPDS#33-1387, the WO3(H2O) 0.5 Belonging to the standard card JCPDS#84-1548, the WO3(H2O) 0.5 / h-WO3 heterostructure material is a flower-like structure with a diameter of 1.4-3μm, which is composed of nanosheets with a diameter of 15-30nm. 0.5 / h-WO3 heterogeneous structure material is used for water treatment; in dye wastewater, methylene blue is 0.1 mg / L and the removal rate is 100% after photocatalytic reaction for 8 hours.

Claims

1. A WO3(H2O) 0.5 / h-WO3 heterostructure material preparation method, characterized in that, The following steps are involved: Disperse 0.2g-0.36g H2WO4 into 8-12mL of 30% commercial hydrogen peroxide, then add 1.8-2.4g NaNO3, mix and heat at 100-125℃ for 20-40min to obtain WO3(H2O). 0.5 / h-WO3 heterostructure material; the WO3(H2O) 0.5 / h-WO3 heterostructure material is a flower-like structure with a diameter of 1.4-3 μm, which is composed of nanosheets with a diameter of 15-30 nm. The h-WO3 belongs to the standard card JCPDS#33-1387. The WO3(H2O) 0.5 Belongs to standard card JCPDS#84-1548.

2. WO3(H2O) prepared by the preparation method according to claim 1 0.5 Application of / h-WO3 heterogeneous structure material in water treatment reaction; in dye wastewater, methylene blue is 0.1-1 mg / L, and the photocatalytic reaction takes 6-8 hours, with a removal rate of 100%.

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