MXene Ti 3 C 2 derived Z?scheme photocatalyst of graphene layers anchored TiO 2 /g?C 3 N 4 for visible light photocatalytic degradation of refractory organic pollutants
MXene Ti 3 C 2 derived Z?scheme photocatalyst of graphene layers anchored TiO 2 /g?C 3 N 4 for visible light photocatalytic degradation of refractory organic pollutants
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MXene Ti3C2 衍生的 Z 型石墨烯层锚定 TiO2/g-C3N4 光催化剂，用于可见光光催化降解难降解有机污染物
DOI：
10.1016/j.cej.2020.124921
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发表时间：
2020-08-15
影响因子：
15.1
通讯作者：
Xiao, Zhihua
中科院分区：
文献类型：
--
作者：
Wu, Zhibin;Liang, Yunshan;Xiao, Zhihua
以四环素(TC)、环丙沙星(CIP)、双酚A(BPA)和罗丹明B(RhB)为原料，采用一步法原位焙烧法制备了高光活性的层状固载二氧化钛/g-C3N4(GTOCN)石墨烯催化剂，并将其用于可见光照射下降解四环素(TC)、环丙沙星(CIP)、双酚A(BPA)和罗丹明B(RhB)。对其晶相、化学组成、形态结构和光电化学性能进行了表征。结果表明，层次化结构的GTOCN光催化剂在可见光吸附和光生载流子分离方面表现出明显的改善。GTOCN3对TC(0.02442 m in−1)、CIP(0.01675 m in−1)、双酚A(0.01935 m in−1)和罗丹明B(0.05586 m in−1)具有最好的可见光催化协同降解率，远高于固定有Ti02、g-C3N4和g-C3N4/Ti02(P25)的石墨烯，这得益于石墨烯、TiO2和g-C3N4之间的固体相互作用，分离和积累了具有高还原能力的g-C3N4电子和具有高氧化能力的TiO2空穴。此外，通过自由基捕获和电子自旋共振实验，确定了污染物分解的主要物种为自由基DOTO2−和自由基DOTOH。此外，GTOCN的可重用性和稳定性表明其在医药、内分泌干扰物和色素废水处理和环境保护等方面具有很大的应用潜力。
Highly photoactive Z–scheme of graphene layers anchored TiO2/g–C3N4(GTOCN) photocatalyst was synthesized from MXene Ti3C2through one–step in–situ calcination, and used for tetracycline (TC) and ciprofloxacin (CIP), bisphenol A (BPA) and rhodamine B (RhB) degradation under visible light irradiation. The crystal phases, chemical compositions, morphological structures and photoelectrochemical properties were characterized. The results demonstrated that hierarchical structured GTOCN photocatalysts exhibited significant improvement in visible light adsorption and photogenerated carriers separation. The GTOCN3 presented the best visible light photocatalytic synergism of degradation rate towards TC (0.02442 min−1), CIP (0.01675 min−1), BPA (0.01935 min−1) and RhB (0.05586 min−1), which was much higher than that of graphene layers anchored TiO2, g–C3N4and g–C3N4/TiO2(P25), benefitting from solid interactions among graphene, TiO2and g–C3N4for separation and accumulation of g–C3N4electrons with high reduction capability and TiO2holes with high oxidation capability. Furthermore, the main species of radical dotO2−and radical dotOH for pollutants decomposition was confirmed by free radical capture and electron spin resonance experiments. Besides, the acceptable reusability and stability indicated the great application potential of GTOCN in pharmaceuticals, endocrine disruptors and colourants contained wastewater disposal and environmental protection.