BiOCl Structure Regulation And Photocatalytic Degradation Of Carbamazepine

People became rich since China’s reform and opening up.In the meantime,organic pollutants such as chemical fertilizers,pesticides,industrial wastes,cosmetics,hospital pharmaceutical wastewater continuously discharge into the environment.Pharmaceutical and Personal Care Products(PPCPs)is a new type of pollutants,has drawn much attention nationwide for its high toxicity and refractory degradation.Carbamazepine,an antiepileptic drug,is a typical representative of PPCPs.Carbamazepine is difficult to be completely removed in the existing wastewater treatment process,resulting in significant persistent characteristics of Carbamazepine in water bodies.Therefore,it is urgent to find a green method that can efficiently degrade Carbamazepine in water.Due to the unique lamellar structure and appropriate bandgap width,BiOCl show great promise in the photocatalytic degradation of Carbamazepine.However,BiOCl was restricted in practical applications because of its unresponsiveness to visible light and low quantum utilization efficiency.This paper focused on the influence of tetrabryl ammonium hydroxide(TBAOH)and different hydroxyl alcohols on the morphology and photocatalytic performance of BiOCl.By optimizing the experimental scheme,the best ratio of TBAOH was explored to improve the photocatalytic performance of BiOCl.The effects of TBAOH and different hydroxyl alcohols on the structure,morphology,and photocatalytic properties of BiOCl were discussed.Finally,carbamazepine was taken as the target pollutant to detect the photocatalytic performance of BiOCl.The main contents are as follows:1.Optimize the photocatalytic performance of BiOCl: BiOCl was synthesized by hydrolysis with Bi(NO3)3?5H2O as the bismuth source,NaCl as the chlorine source,surfactant TBAOH for structural modification.A series of BiOCl photocatalysts were prepared by adjusting the dosage of TBAOH as well as changing the type and dosage of chlorine source.The results showed that BiOCl-1 prepared in 1 mmol of Bi(NO3)3?5H2O,TBAOH and NaCl showing the best photocatalytic performance in the solution of Carbamazepine(2.5 mg?L-1)in simulated sunlight and visible light(the concentration of photocatalyst was 0.8 g?L-1).BiOCl-1 can degrade carbamazepine at91.1 % at 30 min under simulated solar light,and at 49.8 % at 180 min under visible light,while BiOCl without TBAOH can degrade at 58.8 % under solar light and at22.6 % under visible light.2.Reasons underlying TBAOH affects BiOCl: after a series of characterization of the prepared BiOCl,it was found that TBA functional groups were attached to the surface of the BiOCl-1 material after the addition of TBAOH.Furthermore,the characteristic peak of BiOCl(001)was enhanced,the specific surface area was slightly increased,the band gap was narrowed,and the separation efficiency of photogenerated carriers was improved in BiOCl-1.3.Change the number of hydroxyl groups in the solvent: Bi(NO3)3?5H2O was used as the bismuth source,KCl as the chlorine source,and alcohols were used as the solvent for structural modification.BiOCl was synthesized by solvothermal method,and a series of BiOCl photocatalysts were prepared by changing the types of organic alcohols.The results showed that when the organic alcohol was ethylene glycol,the BiOCl prepared displayed the highest photocatalytic activity for Carbamazepine degradation under simulated solar irradiation with a removal rate of 55%.The enhanced photocatalytic activity was due to the surface hydroxyls group and preferential exposed(001)face.