Photochemical method for removing organic phenolic pollutants and hexavalent chromium in water body and preparation method of catalytic agent
A technology for hexavalent chromium and pollutants, applied in the direction of physical/chemical process catalysts, water pollutants, chemical instruments and methods, etc., to achieve the effect of wide application range, broad application prospects, and improved removal efficiency
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Embodiment 1
[0040] Preparation of mesoporous Bi 2 o 3 / TiO 2 Composite nano-visible photocatalyst:
[0041] Dissolve bismuth nitrate in nitric acid of a certain concentration, add a mixed solution of tetraisopropyl titanate and isopropanol drop by drop while stirring at room temperature, the molar ratio of bismuth nitrate to titanate is 3.0%, after the addition is completed Stirring was continued for 2 hours, followed by hydrothermal treatment for 5 hours, cooling to room temperature to remove the supernatant, and infrared drying for 2 hours to obtain light yellow mesoporous Bi 2 o 3 / TiO 2 Composite nano-visible light photocatalyst.
[0042] A glass reactor containing 50 ml of simulated composite polluted wastewater containing 60 mg / L TCP and 45 mg / L hexavalent chromium, mesoporous Bi 2 o 3 / TiO 2 Composite nano-visible light catalyst 50 mg (amount of 1.0 g / L composite polluted wastewater), adjust the pH value of the wastewater to 3.0 with nitric acid, the artificial light source...
Embodiment 2
[0044] The three glass reactors contained 50 ml of simulated composite polluted wastewater, which contained 45 mg / L of hexavalent chromium and TCP with a concentration of 60, 200, and 600 mg / L, respectively, and added mesoporous Bi 2 o 3 / TiO 2 Composite nano-visible light catalyst 50 mg (amount of 1.0 g / L composite polluted wastewater), adjust the pH value of wastewater to 3.0 with nitric acid, the artificial light source used is a 300W xenon lamp, equipped with a 420 nm cut-off filter, turn on the light source and irradiate with visible light for 90 minutes , so that the mesoporous Bi 2 o 3 / TiO 2 Composite nano-visible photocatalyst is excited by visible light to undergo charge separation, using TiO 2 The valence band holes or hydroxyl groups generated by oxidized water photocatalytically degrade TCP, while Bi 2 o 3 The conduction band electrons can reduce the coexisting hexavalent chromium to trivalent chromium with low toxicity. The reaction results are shown in Tab...
Embodiment 3
[0046] Each of the three glass reactors contained 50 ml of simulated composite polluted wastewater, which contained 60 mg / L of TCP and 20, 150, and 500 mg / L of hexavalent chromium, and respectively added mesoporous Bi 2 o 3 / TiO 2 Composite nano-visible light catalyst 50 mg (amount of 1.0 g / L composite polluted wastewater), adjust the pH value of wastewater to 3.0 with nitric acid, the artificial light source used is a 300W xenon lamp, equipped with a 420 nm cut-off filter, turn on the light source and irradiate with visible light for 90 minutes , so that the mesoporous Bi 2 o 3 / TiO 2 Composite nano-visible photocatalyst is excited by visible light to undergo charge separation, using TiO 2 The valence band holes or hydroxyl groups generated by oxidized water photocatalytically degrade TCP, while Bi 2 o 3 The conduction band electrons can reduce the coexisting hexavalent chromium to trivalent chromium with low toxicity. The reaction results are shown in Table 1, which sh...
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