Co(OH)_(2)/g-C_(3)N_(4)复合材料的制备及光催化降解土霉素的性能  

Preparation of Co(OH)_(2)/g-C_(3)N_(4)composites and photocatalytic degradation of oxytetracycline

作　　者：毛娜[1] 徐腾 马欣玥 唐嘉璇 MAO Na;XU Teng;MA Xinyue;TANG Jiaxuan(Weinan Normal University,Wennan 714099,China)

机构地区：[1]渭南师范学院,陕西渭南714099

出　　处：《化工科技》2025年第2期45-50,共6页Science & Technology in Chemical Industry

基　　金：陕西省教育厅重点实验室项目(20JS046);渭南市科技局项目(2021ZDYF-JCYJ-282);渭南师范学院大学生创新训练计划项目(202310723020,S202310723051)。

摘　　要：废水中抗生素的处理方法,是环境污染治理中关注的问题。石墨型氮化碳(g-C_(3)N_(4))能带宽、光生电子-空穴分离效率低,在光催化领域的应用受到限制,加入Co(OH)_(2)改性g-C_(3)N_(4)能够提升其光催化的效率。采用原位沉淀法合成Co(OH)_(2)/g-C_(3)N_(4)复合材料,探究其光芬顿降解土霉素(OTC)的性能。对催化剂进行X-射线衍射(XRD)、傅里叶红外光谱(FTIR)以及荧光光谱(PL)等表征。结果表明,m[5%-Co(OH)_(2)/g-C_(3)N_(4)]=10 mg、m[5%-Co(OH)_(2)/g-C_(3)N_(4)]∶V(OTC)=1∶2 mg/mL、V(H_(2)O_(2))=3 mL、pH=5时,光催化降解OTC的降解率为87%。空穴(h+)和羟基自由基(·OH)是OTC光催化降解过程中的主要影响因素,Co(OH)_(2)和g-C_(3)N_(4)之间形成异质结,提高了光生电子-空穴对的分离和传输效率。该催化剂的合成及应用为光催化降解抗生素提供一种新策略。The treatment of antibiotics in wastewater is an important issue in environmental pollution control.The application of graphitic carbon nitride(g-C_(3)N_(4))in the field of photocatalysis is affected by its low electron-hole separation efficiency due to its energy bandwidth.The photocatalytic efficiency of g-C_(3)N_(4)was improved by adding Co(OH)_(2).This paper adopted the co-precipitation method to synthesize Co(OH)_(2)/g-C_(3)N_(4)composite materials and explored the performance of Co(OH)_(2)/g-C_(3)N_(4)photocatalytic degradation of oxytetracycline.The catalyst was characterized by X-ray diffraction(XRD),Fourier infrared spectroscopy(FTIR),and fluorescence spectroscopy(PL).The study found that when the content of Co(OH)_(2)in 10 mg of composite catalyst was 5%,the solid-liquid ratio was 1∶2,the dosage of H_(2)O_(2)was 3 mL,and the pH was 5,the degradation efficiency of the composite catalyst reached 87%.Holes(h+)and hydroxyl radicals(·OH)were the main influencing factors in the photocatalytic degradation process of oxytetracycline.The improvement of the photocatalytic performance of the composite material was due to the formation of heterojunctions between Co(OH)_(2)and g-C_(3)N_(4),which improved the separation and transmission efficiency of photogenerated electron-hole pairs.The synthesis and application of the catalyst provide a new strategy for photocatalytic degradation of antibiotics.

关 键 词：Co(OH)_(2)/g-C_(3)N_(4) 土霉素 光催化 异质结 光芬顿 

分 类 号：O643.3[理学—物理化学]