摘要
为了获得高效、低能耗的藻污染控制方法,通过煅烧-沉淀法制备出b-N-TiO_(2)/ Ag_(3)PO_(4)复合光催化材料,通过SEM、TEM、XRD、XPS、UV-Vis等表征手段对材料的整体形貌、表面结构和光响应性能进行测试分析.结果表明:①b-N-TiO_(2)均匀分布在Ag_(3)PO_(4)表面,增强了对可见光的响应,并促进了光生电子-空穴对的分离.②b-N-TiO_(2) /Ag_(3)PO_(4)(0.2T A)复合光催化材料降解铜绿微囊藻(Microcystis aeruginosa)细胞中叶绿素a(Chla)的效果最好,其拟一级动力学方程速率常数分别比纯Ag_(3)PO_(4)和b-N-TiO_(2)高2.73和7.72倍,经过8 h可见光催化后,对Chla的降解率为98.1%,且重复利用3次后降解率仍可达85.4%,具有较高的光催化稳定性.③固定化b-N-TiO_(2)/ Ag_(3)PO_(4)复合光催化材料对实际地表水中的藻细胞和藻毒素具有良好的光催化降解性能.因此,b-N-TiO_(2) /Ag_(3)PO_(4)复合光催化材料在未来有害藻类污染的水处理中具有潜在的应用前景.
In order to obtain an efficient and low-consumption harmful algae pollution prevention method,a novel visible-light responsive photocatalyst b-N-TiO_(2)/Ag_(3)PO_(4)was successfully synthesized via a calcination-precipitation technique.The synthesized photocatalyst was characterized using scanning electron microscopy(SEM),transmission electron microscopy(TEM),X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),and UV-Vis diffuse reflectance spectroscopy(DRS).The obtained results highlighted that:(1)b-N-TiO_(2)was uniformly dispersed on the surface of Ag_(3)PO_(4),which significantly broadened the light response range of Ag_(3)PO_(4)and effectively facilitated the separation of electron-hole pairs in the composite b-N-TiO_(2)/Ag_(3)PO_(4).(2)The b-N-TiO_(2)/Ag_(3)PO_(4)(0.2T A)photocatalyst exhibited the highest photocatalytic activity for the degradation of Chla in Microcystis aeruginosa cells.The pseudo-first-order rate constant of b-N-TiO_(2)/Ag_(3)PO_(4)(0.2T A)was 2.73 and 7.72 times that of pure Ag_(3)PO_(4)and b-N-TiO_(2),respectively.After 8 h visible light irradiation,the composite b-N-TiO_(2)/Ag_(3)PO_(4)(0.2T A)was able to remove approximate 98.1%Chla in algal cells.Even after 3 cycles of recycling,the elimination rate of Chla remained at 85.4%.(3)The immobilized b-N-TiO_(2)/Ag_(3)PO_(4)exhibited excellent photocatalytic activity for degrading algal cells and microcystins in surface water.Therefore,the b-N-TiO_(2)/Ag_(3)PO_(4)composite material has potential application prospects in the treatment of harmful algae polluted water.
作者
张旭
崔娜欣
周丽
蔡敏
邹国燕
陈桂发
ZHANG Xu;CUI Naxin;ZHOU Li;CAI Min;ZOU Guoyan;CHEN Guifa(Institute of Eco-Environmental Protection Research,Shanghai Academy of Agricultural Sciences,Shanghai 201403,China;Shanghai Engineering Research Center of Low-Carbon Agriculture,Shanghai 201415,China)
出处
《环境科学研究》
CAS
CSCD
北大核心
2021年第11期2645-2654,共10页
Research of Environmental Sciences
基金
上海市青年科技英才杨帆计划项目(No.21YF1440900)
上海自然科学基金项目(No.21ZR1456700)
国家自然科学基金项目(No.42007147)。
