摘要
P掺杂g-C_(3)N_(4)(P-g-C_(3)N_(4))具有比g-C_(3)N_(4)更窄的带隙,能提高其对可见光的利用率并提高光催化性能.采用热聚合和原位沉积法制备了Ag_(3)PO_(4)/P-g-C_(3)N_(4)(A/CN)复合材料,并对其结构、形貌特征、光学性质及元素组成进行了分析,探究了A/CN在可见光下降解双酚S(BPS)的性能,考察了溶液初始pH、溶解性有机质(DOM)及无机盐离子(HCO_(3)^(-)、NO_(3)^(-))对BPS降解的影响,并探讨了A/CN降解BPS的机理.结果表明:A/CN具有比Ag_(3)PO_(4)或P-g-C_(3)N_(4)更优异的光催化性能,能在120 min内降解95.02%的BPS(10 mg·L^(-1));酸性或碱性条件均会抑制BPS的降解,HCO_(3)^(-)和DOM投加均对BPS的降解表现出低浓度促进和高浓度抑制的双重作用,NO_(3)^(-)的添加抑制了BPS的降解;空穴(h^(+))和·O_(2)^(-)是A/CN光催化降解BPS体系的主要活性物种,A/CN的复合结构及Ag纳米颗粒的形成显著抑制了复合材料中光生电子与h^(+)的复合,从而显著提高了其光催化性能.A/CN对实际水环境中的BPS也表现出较好的去除效果,说明其具有良好的实际应用前景,为光催化降解BPS提供了新的思路和理论基础.
Phosphorus-doped g-C_(3)N_(4)(P-g-C_(3)N_(4))has a narrower bandgap than g-C_(3)N_(4),which can improve its utilization of visible light and enhance its photocatalytic performance.The Ag_(3)PO_(4)/P-g-C_(3)N_(4)(A/CN)hybrid composite was synthesized by thermal polymerization coupled with an in-situ precipitation method.The structure,morphological features,optical properties,and chemical state of the samples were characterized by a series of techniques.The A/CN composite was used to degrade bisphenol S(BPS)under visible light irradiation,and the influencing factors including pH,dissolved organic matter(DOM),inorganic salt ion(HCO_(3)^(-),NO_(3)^(-)),as well as degradation mechanism were investigated.The results indicated that A/CN showed better photocatalytic activity than Ag_(3)PO_(4)or P-g-C_(3)N_(4),degrading 95.02%BPS(10 mg·L^(-1))within 120 min.The degradation of BPS was inhibited under both acidic and alkaline conditions.A stimulatory effect was observed at low concentrations of HCO_(3)^(-)or DOM,while inhibitory effects were found at high concentrations of HCO_(3)^(-)or DOM,as well as NO_(3)^(-)addition.Holes(h^(+))and superoxide radicals(·O_(2)^(-))were the dominant reactive species involved in BPS degradation by A/CN.The recombination rate of photo-induced electron and h+was inhibited by the hybrid structure of A/CN and the formation of Ag nanoparticles,which remarkably enhanced the photocatalytic activity of the A/CN composite.The A/CN composite has shown relatively good performance in BPS degradation in real natural waters,implying its excellent potential for practical application.This provides new ideas and a theoretical basis for the photocatalytic degradation of BPS.
作者
王国庆
陈苗
徐敏强
孙善伟
张恒
WANG Guoqing;CEHN Miao;XU Minqiang;SUN Shanwei;ZHANG Heng(Puyang Vocational and Technical College,Puyang Institute of Technology,Henan University,Puyang 457000;College of Land Resource and Environment,Jiangxi Agricultural University,Nanchang 330045;State Environmental Protection Key Laboratory of Ecological Effect and Risk Assessment of Chemicals,Chinese Research Academy of Environmental Sciences,Beijing 100012;Huzhou Nanxun District Environmental Emergency and Accident Investigation Center,Huzhou 313399)
出处
《环境科学学报》
北大核心
2025年第3期156-169,共14页
Acta Scientiae Circumstantiae
基金
江西省自然科学基金项目(No.20242BAB20151)。
