以十六烷基三甲基溴化铵(CTAB)为溴源,采用简单的一步共沉淀法合成AgBr/Ag2CO3复合光催化剂,并利用粉末衍射(XRD)、扫描电镜(SEM)、紫外漫反射(UV-Vis DRS)、荧光光谱(PL)和紫外可见光分光光度计等进行表征。以亚甲基蓝溶液为模拟染料进行光催化降解实验,探讨了反应时间、复合物质量比对样品催化性能的影响。结果表明:AgBr的光生电子易迁移到Ag2CO3表面,使复合催化剂稳定性增强,表现出比单一AgBr或Ag2CO3更优越的光催化性能。共沉淀反应时间为1h,加入0.3g CTAB合成的AgBr/Ag2CO3样品在用量为0.08g时降解200mL 10mg/L亚甲基蓝溶液30min后,降解率达到99.19%,第3次循环降解,其降解率仍高达60.91%,循环利用率高。
AgBr/Ag2CO3 composite as photocatalyst was synthesized via a facile one-step coprecipitation method by adding different contents of CTAB as Br source,and characterized by XRD,SEM,UV-Vis DRS and PL.The photocatalytic activity of the as-synthesized AgBr/Ag2CO3 composite were explored by the removal of the photocatalytic degradation of methylene blue(MB) aqueous solution under illumination of visible-light.The effects of coprecipitation time and quality added of CTAB on the catalytic performance of the samples were also investigated.The results revealed that AgBr/Ag2CO3 composite shown a superior photocatalytic behavior than those of the single-phase AgBr or Ag2CO3 due to the photo-produced e- of AgBr may be transferred into Ag2CO3.Among these composites,0.08g AgBr/Ag2CO3 composite obtained with 0.3g CTAB,and co-precipitation time of 1h,shown the highest degradation rate with 99.19% removal efficiency of MB within 30min.More importantly,the recycling tests proved that the degradation rate of methylene blue can reached 60.91% after cycled for three times.
[1] Zhou Xiaosong,Jin Bei,Li Liandi,et al.A carbon nitride/TiO2 nanotube array heterojunction visible-light photocatalyst:synthesis,characterization,and photoelectrochemical properties[J].Journal of Materials Chemistry,2012,22:17900-17905.
[2] Teng Qizhi,Zhou Xiaosong,Jin Bei,et al.Synthesis and enhanced photocatalytic activity of a BiOI/TiO2 nanobelt array for methyl orange degradation under visible light irradiation[J].RSC Advances,2016,6:36881-36887.
[3] Xing Zipeng,Zhang Jiaqi,Cui Jiayi,et al.Recent advances in floating TiO2-based photocatalysts for environmental application[J].Applied Catalysis B:Environmental,2018,225:452-467.
[4] Shahini P,Ashkarran A A.Immobilization of plasmonic Ag-Au NPs on the TiO2 nanofibers as an efficient visible-light photocatalyst[J].Colloids and Surfaces A,2018,537:155-162.
[5] Zhang Jianling,Huang Yun,Dan Yi,et al.P3HT/Ag/TiO2 ternary photocatalyst with significantly enhanced activity under both visible light and ultraviolet irradiation[J].Applied Surface Science,2019,488:228-236.
[6] Eswar N K R,Katkar V V,Ramamurthy P C,et al.Novel AgBr/Ag3PO4 decorated ceria nanoflake composites for enhanced photocatalytic activity toward dyes and bacteria under visible light[J].Industrial & Engineering Chemistry Research,2015,54:8031-8042.
[7] Zhu Lifang,Huang Daiqin,Ma Jianfeng,et al.Fabrication of AgBr/Ag2CrO4 composites for enhanced visible-light photocatalytic activity[J].Ceramics International,2015,41:12509-12513.
[8] Miao Xuli,Ji Zhenyuan,Wu Jiajia,et al.g-C3N4/AgBr nanocomposite decorated with carbon dots as a highly efficient visible-light-driven photocatalyst[J].Journal of Colloid and Interface Science,2017,502:24-32.
[9] Zhong Liansheng,Hu Chaohao,Zhuang Jing,et al.AgBr/MgBi2O6 heterostructured composites with highly efficient visible-light-driven photocatalytic activity[J].J Phys Chem Solids,2018,117:94-100.
[10] Huang Danlian,Li Jing,Zeng Guangming,et al.Facile construction of hierarchical flower-like Z-scheme AgBr/Bi2WO6 photocatalysts for effective removal of tetracycline:degradation pathways and mechanism[J].Chemical Engineering Journal,2019,375(1):121991.
[11] Li Shijie,Jiang Wei,Hua Shiwei,et al.Construction of a novel ternary Ag/AgBr/Ag2WO4 composite for efficient photocatalytic removal of rhodamine B dye and tetracycline hydrochloride antibiotic[J].Materials Letters,2018,224:29-32.
[12] Guo Ruonan,Qi Xinyu,Zhang Xinyi,et al.Synthesis of Ag2CO3/α-Fe2O3 heterojunction and it high visible light driven[J].Separation and Purification Technology,2019,211:504-513.
[13] Wu Xuesen,Hu Yidong,Wang Yu,et al.In-situ synthesis of Z-scheme Ag2CO3/Ag/AgNCO heterojunction photocatalyst with enhanced stability and photocatalytic activity[J].Applied Surface Science,2019,464:108-114.
[14] Tonda S,Kumar S,Shanker V.In situ growth strategy for highly efficient Ag2CO3/g-C3N4 hetero/nanojunctions with enhanced photocatalytic activity under sunlight irradiation[J].Journal of Environmental Chemical Engineering,2015,3:852-861.
[15] Chen Jiufu,Zhong Junbo,Li Jianzhang,et al.Synthesis and characterization of novel Ag2CO3/g-C3N4 composite photocatalysts with excellent solar photocatalytic activity and mechanism insight[J].Molecular Catalysis,2017,435:91-98.
[16] Tian Na,Huang Honghwei,He Ying,et al.Organic-inorganic hybrid photocatalyst g-C3N4/Ag2CO3 with highly efficient visible-light-active photocatalytic activity[J].Colloids and Surfaces A:Physicochemical and Engineering Aspects,2015,467:188-194.
[17] Liu Huiyun,Liang Chao,Niu Chenggang,et al.Facile assembly of g-C3N4/Ag2CO3/graphene oxide with a novel dual Zscheme system for enhanced photocatalytic pollutant degradation[J].Applied Surface Science,2019,475:421-434.
[18] Sun Haibo,Qin Pufeng,Wu Zhibin,et al.Visible light-driven photocatalytic degradation of organic pollutants by a novel Ag3VO4/Ag2CO3 pen heterojunction photocatalyst:mechanistic insight and degradation pathways[J].Journal of Alloys and Compounds,2020,834:155211-155217.
[19] Yu Changlin,Wei Longfu,Zhou Wanqin,et al.Enhancement of the visible light activity and stability of Ag2CO3 by formation of AgI/Ag2CO3 heterojunction[J].Applied Surface Science,2014,319:312-318.
[20] Fujihara Kan,Izumi Shinobu,Ohno Teruhisa,et al.Time-resolved photoluminescence of particulate TiO2 photocatalysts suspended in aqueous solution[J].Journal of photochemistry and Photobiology A:Chemistry,2000,132(1):99-104.
[21] Senthil R A,Khan A,Pan Junqing,et al.A facile single-pot synthesis of visible-light-driven AgBr/Ag2CO3 composite as efficient photocatalytic material for water purification[J].Colloids and Surfaces A,2020,586:124183-124187.