The Photocatalyst Was Prepared With Adsorbent As A Template To Remove Environmental Endocrine Disruptors

Endocrine Disrupting Chemicals(EDCs),could interfer the endocrine system of animals and plants and cause the endocrine abnormalities.At present,a large number of domestic and foreign scholars were spare no effort to find the ideal techniques to removal EDCs.Among these techniques,adsorption and photocatalysis method with its unique advantages are becoming a hot spot of research.In this paper,EDCs was removed by the adsorption and photocatalytic technology.The high efficient photocatalysts were synthesized on the basis of the templates of the high efficient adsorbents.The high efficient photocatalysts were expected to inherit the microstructure of the high efficient adsorbents and then obtained excellent photocatalytic properties.According to the characteristics of strong hydrophobic EDCs compounds,PACPF and BNW adsorbents were designed and synthesized,and two kind of photocatalysts of ?-Bi2O3 nanosheets and ?-Bi2o3 nanowires were prepared by using PACPF and BNW as templates,respectively.Four kinds of materials were used to remove BPA or EE2,and characterized by the SEM,TEM,BET,EDS,XRD,UV-Vis diffuse reflectance spectroscopy and PL to evaluate the morphology,phase and optical performance.The main research content in this dissertation are as follows:1.The adsorbent PACPF was prepared in ice water bath by using aniline and pyrrole as monomer,ammonium persulfate as initiator,P123 as morphology controlling agent.The prepared PACPF were used to adsorb BPA(40mg/L)in water.The adsorption equilibrium time was 480 min at room temperature.The PACPF maximum theory adsorption quantity for BPA was calculated by Langmuir model and reached 157.7 mg/g.Mechanism experiment suggested that the adsorption process of BPA on PACPF were mainly due to ? bonding and hydrogen bonding interaction.2.The ?-Bi2O3 nanosheets was synthesized by precipitation method and used to remove EE2(3mg/L).PACP was not only a structure-directing agent but was also the sources of C and N.The addition of PACP not only enhanced the adsorption capacity of?-Bi2O3 nanosheets to EE2,but also greatly improved the catalytic performance of(3-Bi2O3 nanosheets by introducing trace amounts of C and N elements.The optimum material were used to photocatalytic degradation EE2 and 98.86%of EE2(3mg/L)was degraded after only 20 min of visible-light irradiation.The recycled experimental results showed that the materials from pure ?-Bi2O3 become ?-Bi2O3/Bi2O2CO3 composite and formed p-n heterojunction after the photodegradation.The ?-Bi2O3/Bi2O2CO3 composite still could remove EE2 rapidly after recycled three times.3.The BNW adsorbent was prepared for removal BPA(10mg/L)by using Bi(NO3)3·5H2O and H2BDC as raw material,DMF as solvent.The adsorption equilibrium time was 120 min at room temperature.The maximum theory adsorption quantity for BPA was calculated by Langmuir model and reached 44.05 mg/g.Mechanism experiment suggested that the adsorption process of BPA on BNW adsorbent were mainly due to ?bonding and hydrogen bonding interaction.4.?-Bi2O3 nanowires was prepared using BNW adsorbent as precursor for photocatalytic degradation of BPA(10mg/L).Elemental analysis results showed that there were trace amounts of C and N elements in p-Bi2O3 nanowires.The trace elements of C and N elements helped to expand the range of visible light absorption as well as increasedthe separation efficiency of electronic and hole.The structure of nanowires further improved the transmission efficiency of photogenerated electrons.The remove rate for 10 mg/L BPA solution is about 99.9%after only 20 min of visible-light irradiation.The recycled experimental results showed that the removal rate of BPA were more than 96%,the materials still could remove BPA rapidly after recycled three times.