Biomimetic synthesis method of high-activity nanometer bismuth phosphate photocatalyst
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A photocatalyst and biomimetic synthesis technology, applied in the field of photocatalysis, can solve the problems of difficult preparation of nanoparticles and achieve high photocatalytic activity
Inactive Publication Date: 2014-07-23
HENAN NORMAL UNIV
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While the usual BiPO 4 Preparation methods, such as co-precipitation, hydrothermal and solid-phase methods, are difficult to prepare nanoparticles of BiPO 4 , so looking for a simple, easy-to-operate and environmentally friendly preparation of highly active nano-BiPO 4 Photocatalyst approach makes sense
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Embodiment 1
[0010] Dissolve 0.685g of soluble starch in 1mol / L nitric acid solution, stir well, add 1mmol of bismuth nitrate, and continue stirring for 2h to obtain a mixed solution; add 1mmol of sodium dihydrogen phosphate to the mixed solution, stir for 0.5h, add Adjust pH=1, continue to stir for 0.5h, transfer to hydrothermal reaction kettle for 24h at 180°C, centrifuge, wash, vacuum dry at 60°C for 4h, and then calcinate at 450°C for 2h to obtain highly active nano phosphoric acid Bismuth photocatalyst 1, figure 1 It is the scanning electron micrograph of the highly active nano bismuth phosphate photocatalyst that the present embodiment makes, figure 2 It is a transmission electron microscope image of the highly active nanometer bismuth phosphate photocatalyst prepared in the present embodiment, and the particle diameter of the bismuth phosphate photocatalyst 1 obtained can be seen from the figure to be 10-50nm.
Embodiment 2
[0012] Dissolve 0.343g of soluble starch in 1mol / L nitric acid solution, stir evenly, add 1mmol of bismuth nitrate, and continue stirring for 2h to obtain a mixed solution; add 1mmol of ammonium dihydrogen phosphate to the mixed solution, stir for 0.5h, add Adjust pH=4, continue to stir for 0.5h, transfer to hydrothermal reaction kettle at 180°C for 24h, centrifuge, wash, vacuum dry at 60°C for 4h, and then calcinate at 400°C for 2h to obtain highly active nano phosphoric acid Bismuth photocatalyst 2.
Embodiment 3
[0014] Dissolve 1.37g of soluble starch in 1mol / L nitric acid solution, stir evenly, add 1mmol of bismuth nitrate, and continue stirring for 2h to obtain a mixed solution; add 1mmol of disodium hydrogen phosphate to the mixed solution, stir for 0.5h, add Adjust pH=7, continue to stir for 0.5h, transfer to hydrothermal reaction kettle for 6h at 210°C, centrifuge, wash, dry in vacuum at 60°C for 4h, and then calcinate at 500°C for 2h to produce highly active nano phosphoric acid Bismuth photocatalyst3.
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Abstract
The invention discloses a biomimetic synthesis method of a high-activity nanometer bismuth phosphate photocatalyst. According to the technical scheme, the biomimetic synthesis method is characterized by comprising the following steps: (1) dissolving soluble starch into a 1mol/L nitric acid solution, adding bismuth nitrate after evenly agitating, and agitating for 2 hours again so as to obtain a mixed solution, wherein the molar ratio of the soluble starch to bismuth nitrate is (1-4):1; and (2) adding phosphate with molar weight equal to that of bismuth nitrate to the mixed solution prepared in the step (1), agitating for 0.5 hour, adjusting the pH to 1-7 by ammonium hydroxide, agitating for 0.5 hour again, transferring into a hydrothermal reaction kettle to carry out hydrothermal reaction at 150-210 DEG C for 6-24 hours, centrifugally separating, washing, drying in vacuum at 60 DEG C for 4 hours, and then burning at 400-500 DEG C for 2 hours, thereby obtaining the high-activity nanometer bismuth phosphate photocatalyst. The high-activity nanometer bismuth phosphate photocatalyst prepared by the method is a nanometer material and has high photocatalytic activity, which is higher than that of P25 and a bismuth phosphate photocatalyst prepared by a common hydrothermal method.
Description
technical field [0001] The invention belongs to the technical field of photocatalysis, and in particular relates to a biomimetic synthesis method of a high-activity nano bismuth phosphate photocatalyst. Background technique [0002] As an advanced oxidation technology, photocatalytic degradation of pollutants has great application prospects in environmental remediation and has received more and more attention. The photocatalyst is the core of this technology. Among many semiconductor photocatalysts, TiO 2 Due to its biological inertness, strong oxidation, low cost and high efficiency, resistance to light corrosion and chemical corrosion, and strong stability, it is considered to be the most suitable photocatalyst for environmental pollution control. But TiO 2 There are still some shortcomings that are difficult to overcome, such as low utilization rate of sunlight, high recombination rate of photogenerated holes-electrons, and difficulty in separation and recovery. Theref...
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