znin 2 the s 4 /bipo 4 Heterojunction photocatalyst, preparation method and application thereof
A photocatalyst, znin2s4 technology, applied in physical/chemical process catalysts, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve problems such as low utilization rate of light energy, low photocatalytic activity, and weak visible light response , to achieve the effect of improved photocatalytic activity, simple operation, and improved photocatalytic activity
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[0032] The preparation method comprises the following steps:
[0033] Step 1: Add bismuth nitrate and trisodium phosphate to ethylene glycol, and carry out hydrothermal reaction to prepare nano-spherical bismuth phosphate, wherein, the mass ratio of bismuth nitrate to trisodium phosphate is 10-13:10, and hydrothermal reaction The temperature is 120~170℃, and the reaction time is 5~8h;
[0034] Step 2: adding zinc acetate, indium nitrate and cysteine to deionized water, and performing a hydrothermal reaction to prepare indium zinc sulfide, wherein the molar ratio of zinc acetate, indium nitrate and cysteine is 1:1-2 : 6~8; hydrothermal method reaction temperature is 120~200 ℃, and reaction time is 10~16h;
[0035] Step 3: Add the indium zinc sulfide prepared in step 2 and the bismuth phosphate prepared in step 1 to deionized water, and perform a hydrothermal reaction to prepare ZnIn 2 S 4 / BiPO 4 The p-n heterojunction photocatalyst has a mass ratio of indium zinc sulfi...
Embodiment 1
[0044] According to the above-mentioned technical scheme, this embodiment provides the ZnIn2S4 / BiPO4 heterojunction photocatalyst, its preparation method and its application. Include the following steps:
[0045] Step 1: 1.455g Bi(NO 3 ) 3 ·5H 2 O and 1.14 g Na 3 PO 4 12H 2 O dissolved in 100mL C 2 h 6 o 2 Then, stir at room temperature for 5-8 hours to obtain a precipitate, wash the precipitate three times with ethanol at a speed of 11000 rpm, and then add 60ml of 2mol / L phosphoric acid aqueous solution to the precipitate to form a mixed solution. Subsequently, the mixed solution was transferred into a 100 ml Teflon-lined stainless steel autoclave, and then heated to 160 °C for 6 h. The precipitate was collected by centrifugation, washed three times with ethanol, and dried at 60 °C for 24 h, then ground into powder to obtain nanospherical BiPO composed of flakes 4 , SEM picture as figure 1 As shown, the nanospherical BiPO 4 The particle size is 500-800nm.
[0046...
Embodiment 2
[0051] ZnIn of this embodiment 2 S 4 / BiPO 4 The preparation method of the p-n heterojunction photocatalyst is the same as in Example 1, the only difference is that the BiPO prepared in the preparation method 4 The shape of the BiPO in this example is different 4 The shape of is octahedron, and the preparation method is as follows:
[0052] Add nitric acid to 40ml deionized water, adjust the pH value to 1, weigh 2mmol Bi(NO 3 ) 3 ·5H 2 O and 2 mmol Na 3 PO4·12H 2 O, dissolved in the above solution, stirred at room temperature until completely dissolved and ultrasonicated for 30min. Then the mixture was transferred to a polytetrafluoroethylene-lined reactor, placed in an oven, kept at 190°C for 24 h, and then cooled to room temperature naturally. The product was centrifuged and washed several times with deionized water and absolute ethanol, dried under vacuum at 60 °C for 18 h, and finally ground into powder to collect octahedral BiPO 4 sample. Such as figure 1 As s...
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