李静1,
龚焱2,
李一兵1,
赵旭2,
1.河北工业大学土木与交通学院，天津 300401
2.中国科学院生态环境研究中心，环境水质学国家重点实验室，北京 100085
基金项目: 国家自然科学基金资助项目（51578532）
河北省住房和城乡建设厅科研项目（2014-230）
Photocatalytic degradation of BPA by a MnFe2O4 manosphere modified graphite carbon nitride composite photocatalyst with peroxymonosulfate activation ability
ZHANG Mingming1,2,,LI Jing1,
GONG Yan2,
LI Yibing1,
ZHAO Xu2,
1.School of Civil and Transportation, Hebei University of Technology, Tianjin 300401, China
2.State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
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摘要:采用水热法制备了铁酸锰(MnFe2O4)纳米球修饰的石墨相氮化碳(g-C3N4)复合光催化剂(MnFe2O4/g-C3N4)，并对其光催化活化过一硫酸盐(PMS)去除内分泌干扰物双酚A(BPA)的性能进行探究。考察了PMS浓度、MnFe2O4负载量、催化剂投加量及pH对双酚A去除的影响。XRD、SEM、TEM及FT-IR等结果证明，MnFe2O4纳米球已成功负载于g-C3N4。光催化实验结果表明，与单独g-C3N4相比，MnFe2O4/g-C3N4光催化活性有明显提升。同时，PMS的加入可进一步大幅提高该复合光催化剂的光催化性能。当PMS浓度为1 mmol·L-1、MnFe2O4负载量为20%及催化剂投加量为0.5 g·L-1时，复合催化剂光催化活性最佳，反应2 h后，BPA的去除率达到98%。光电化学测试结果表明，引入MnFe2O4后可提升g-C3N4光生载流子分离能力。重复性实验结果表明该复合光催化剂具备较好的稳定性。本研究可为新型高效光催化体系的开发及其在环境污染控制领域的应用提供参考。
关键词: 光催化/
石墨相氮化碳/
铁酸锰/
过一硫酸盐/
双酚A
Abstract:In this work, MnFe2O4/g-C3N4 composite photocatalyst was prepared through a facile hydrothermal method and its photocatalytic activity for BPA degradation was evaluated. The effects of the operational parameters including PMS concentration, MnFe2O4 loading content, catalyst dosage, and pH on photocatalytic degradation of BPA were investigated. The characterization results of X-ray diffraction(XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FT-IR) demonstrated that the MnFe2O4 nanospheres have been successfully loaded on the g-C3N4. Compared with bare g-C3N4, the MnFe2O4/g-C3N4 composite showed an enhanced photocatalytic activity for BPA degradation under visible light irradiation. More importantly, the as-prepared hybrids exhibited remarkably improved photocatalytic activities toward BPA degradation in the presence of PMS under visible light irradiation. Nearly 98% of BPA can be removed after 2 h irradiation by the 20% MnFe2O4/g-C3N4 with dosage of 0.5 g·L-1 under the optimal condition of 1 mmol·L-1 PMS. Photoelectrochemical data further confirmed the enhanced charge carrier separation performance of composite. The result of repeated experiments showed that MnFe2O4/g-C3N4 composite possessed an excellent photocatalytic stability. This work paves the way for the design of novel photocatalysis systems with applications in environmental remediation.
Key words:photocatalytsis/
g-C3N4/
MnFe2O4/
peroxymonosulfate/
bisphenol A.
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铁酸锰纳米球修饰石墨相氮化碳光催化活化过一硫酸盐去除双酚A
张明明1,2,,李静1,
龚焱2,
李一兵1,
赵旭2,
1.河北工业大学土木与交通学院，天津 300401
2.中国科学院生态环境研究中心，环境水质学国家重点实验室，北京 100085
基金项目: 国家自然科学基金资助项目（51578532） 河北省住房和城乡建设厅科研项目（2014-230）
关键词: 光催化/
石墨相氮化碳/
铁酸锰/
过一硫酸盐/
双酚A
摘要:采用水热法制备了铁酸锰(MnFe2O4)纳米球修饰的石墨相氮化碳(g-C3N4)复合光催化剂(MnFe2O4/g-C3N4)，并对其光催化活化过一硫酸盐(PMS)去除内分泌干扰物双酚A(BPA)的性能进行探究。考察了PMS浓度、MnFe2O4负载量、催化剂投加量及pH对双酚A去除的影响。XRD、SEM、TEM及FT-IR等结果证明，MnFe2O4纳米球已成功负载于g-C3N4。光催化实验结果表明，与单独g-C3N4相比，MnFe2O4/g-C3N4光催化活性有明显提升。同时，PMS的加入可进一步大幅提高该复合光催化剂的光催化性能。当PMS浓度为1 mmol·L-1、MnFe2O4负载量为20%及催化剂投加量为0.5 g·L-1时，复合催化剂光催化活性最佳，反应2 h后，BPA的去除率达到98%。光电化学测试结果表明，引入MnFe2O4后可提升g-C3N4光生载流子分离能力。重复性实验结果表明该复合光催化剂具备较好的稳定性。本研究可为新型高效光催化体系的开发及其在环境污染控制领域的应用提供参考。
English Abstract
Photocatalytic degradation of BPA by a MnFe2O4 manosphere modified graphite carbon nitride composite photocatalyst with peroxymonosulfate activation ability
ZHANG Mingming1,2,,LI Jing1,
GONG Yan2,
LI Yibing1,
ZHAO Xu2,
1.School of Civil and Transportation, Hebei University of Technology, Tianjin 300401, China
2.State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
Keywords: photocatalytsis/
g-C3N4/
MnFe2O4/
peroxymonosulfate/
bisphenol A
Abstract:In this work, MnFe2O4/g-C3N4 composite photocatalyst was prepared through a facile hydrothermal method and its photocatalytic activity for BPA degradation was evaluated. The effects of the operational parameters including PMS concentration, MnFe2O4 loading content, catalyst dosage, and pH on photocatalytic degradation of BPA were investigated. The characterization results of X-ray diffraction(XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FT-IR) demonstrated that the MnFe2O4 nanospheres have been successfully loaded on the g-C3N4. Compared with bare g-C3N4, the MnFe2O4/g-C3N4 composite showed an enhanced photocatalytic activity for BPA degradation under visible light irradiation. More importantly, the as-prepared hybrids exhibited remarkably improved photocatalytic activities toward BPA degradation in the presence of PMS under visible light irradiation. Nearly 98% of BPA can be removed after 2 h irradiation by the 20% MnFe2O4/g-C3N4 with dosage of 0.5 g·L-1 under the optimal condition of 1 mmol·L-1 PMS. Photoelectrochemical data further confirmed the enhanced charge carrier separation performance of composite. The result of repeated experiments showed that MnFe2O4/g-C3N4 composite possessed an excellent photocatalytic stability. This work paves the way for the design of novel photocatalysis systems with applications in environmental remediation.
