首页|SiO2增强自敏性氮化碳微球可见光降解盐酸四环素的研究

SiO2增强自敏性氮化碳微球可见光降解盐酸四环素的研究

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光催化技术在水中新型污染物的治理中应用广泛。自敏性氮化碳(SSCN)是一种新型非金属光催化剂，其表面的自敏性高分子可以有效地拓宽可见光吸收范围，但该材料存在严重的团聚现象，抑制了其光催化活性和稳定性。SiO2的分散性好，被广泛用作载体构建复合结构应用于光催化领域。本研究首先用Stober法制备了 SiO2微球，随后利用水热法原位合成了 SiO2/SSCN复合材料。采用多种表征手段分析样品的物相结构、微观形貌、光电性能。制备的复合材料在光催化降解水中盐酸四环素中表现出增强的降解活性，其活性与SiO2加入量密切相关，当SiO2与SSCN的质量比为0。04∶1时，复合材料的光催化活性和稳定性最佳，光照60 min可降解42％的盐酸四环素，经5次循环后其光催化降解效率仍然能够维持约38％。引入的SiO2为SSCN提供了分散位点，改善了 SSCN较为严重的团聚现象，使SSCN表面的1，3，5-三嗪基低聚物(TBO)快速分解后达到表面活性位点暴露的最佳含量，提升了 SSCN对可见光的利用率，促进了光生电荷的分离效率，从而有效地提升了 SSCN的光催化活性及稳定性。本研究为提高催化剂的光催化活性和稳定性及治理新型污染物提供了一个新思路。
Visible-light Photodegradation of Tetracycline Hydrochloride on Self-sensitive Carbon-nitride Microspheres Enhanced by SiO2
Photocatalysis is widely employed to treat emerging pollutants in water,due to its well-organized attributes.Self-sensitive carbon nitride(SSCN)represents a novel class of non-metallic photocatalyst that has garnered significant attention for its distinctive properties in contrast with traditional graphitic carbon nitride(g-C3N4).However,their visible-light photodegradation effect remained still to be enhanced.Here,SiO2 microspheres were initially synthesized by the Stöber method,followed by the preparation of SiO2/SSCN composites through an in-situ hydrothermal process.Their microstructure,phase structure,and photoelectric properties were systematically investigated using a combination of characterization techniques.It is discovered that the SiO2 within the composites effectively disperses in the SSCN.The obtained composite material was then applied to photocatalytic degradation of antibiotic pollutants in water,exhibiting enhanced degradation activity,which was closely correlated with the quantity of SiO2.At mass ratio of SiO2 to SSCN of 0.04∶1,the composite achieved optimal photocatalytic activity and demonstrated good stability.After irradiation for 60 min,42％of tetracycline hydrochloride was degraded,and the photocatalytic degradation efficiency remained at 38％after 5 cycles.Furthermore,incorporation of the SiO2 component offers supplementary sites for the dispersion of SSCN,mitigating serious agglomeration phenomenon of SSCN.This facilitates the rapid decomposition of 1,3,5-triazine oligomers(TBO)on the surface of SSCN under light irradiation,and the optimizing content of TBO on surface active sites.Consequently,utilization efficiency of visible light on SSCN is significantly improved,and a higher separation rate of photogenerated electron-hole pairs is simultaneously observed.These attributes culminate in significantly improved photocatalytic activity for the degradation of tetracycline hydrochloride on SSCN under visible light irradiation.Above advantages may position the as-synthesized SiO2 dispersed SSCN as prospective candidate for practical application.Therefore,this research offers a novel route for enhancing the photocatalytic activity and stability of catalysts.

self-sensitive carbon nitridesilicon dioxidephotocatalysistetracycline hydrochlorideenhanced activity

曹青青、陈翔宇、吴健豪、王筱卓、王乙炫、王禹涵、李春颜、茹菲、李兰、陈智

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中国计量大学材料化学学院,杭州 310018

自敏性氮化碳 二氧化硅 光催化 盐酸四环素 活性增强

国家重点研发计划浙江省尖兵领雁项目宁波市重大科技任务攻关项目中建股份科技重点研发项目国家级大学生创新创业训练计划浙江省高分子材料表界面重点实验室开放基金

2023YFF06126002023C020382022Z178CSCEC-2021-Z-5202210356009SISPM-2022-03

2024

10.15541/jim20240009

无机材料学报
中国科学院上海硅酸盐研究所

无机材料学报

CSTPCD北大核心
影响因子：0.768
ISSN：1000-324X
年,卷(期)：2024.39(7)