Ultrathin g-C3N4 Films Supported on Attapulgite Nanofibers with Enhanced Photocatalytic Performance
Ultrathin g-C3N4 Films Supported on Attapulgite Nanofibers with Enhanced Photocatalytic Performance
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凹凸棒土纳米纤维负载的超薄 g-C3N4 薄膜具有增强的光催化性能
DOI：
10.1016/j.apsusc.2018.01.127
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发表时间：
2018
影响因子：
6.7
通讯作者：
Xin Wang
中科院分区：
文献类型：
--
作者：
Yongshuai Xu;Lili Zhang;Minghui Yin;Dengyu Xie;Jiaqi Chen;Jingzhou Yin;Yongsheng Fu;Pusu Zhap;Hui Zhong;Yijiang Zhao;Xin Wang
以3-缩水甘油氧基丙基三甲氧基硅烷（KH 560）为表面活性剂，通过原位沉积法将g-C3 N4. 5 H2O薄膜引入到ATP（三聚氰胺）表面，制备了一种新型的可见光响应光催化剂。利用XRD、FT-IR、BET、XPS、UV-vis、TEM和SEM等技术对产物的组成、形貌和光学性能进行了表征。结果表明，在KH_（560）的作用下，g-C_3 N_4以包覆层的形式均匀地负载在ATP表面，形成新的化学键（Si-O-C）。与g-C_3 N_4和ATP相比，ATP/g-C_3 N_4催化剂对橙子的可见光催化降解活性显著提高。(MO)由于其高的比表面积、合适的带隙以及g-C3 N4与ATP之间的协同作用，通过控制ATP-KH 560与三聚氰胺的质量比（r = m（ATP-KH 560）/m（三聚氰胺））来调节g-C3 N4的比例，以获得最佳的光催化剂。当r = 0.5时，甲基橙子（MO）的降解率最高，达到96.06%，循环4次后，降解率基本不变，是纯g-C_3 N_4的10倍。提出了可能的光催化机理。
A novel visible-light-responsive photocatalyst is fabricated by introducing g-C3N4 .ultrathin films onto the surface of attapulgite (ATP) via a simple in-situ depositing technique, in .which ATP was pre-grafted using (3-Glycidyloxypropyl) trimethoxysilane (KH560) as the surfactant. .A combination of XRD, FT-IR, BET, XPS, UV-vis, TEM and SEM techniques are utilized to .characterize the composition, morphology and optical properties of the products. The results show .that with the help of KH560, g-C3N4 presented as ultrathin layer is uniformly loaded onto the surface .of ATP by forming a new chemical bond (Si-O-C). Comparing with g-C3N4 and ATP, ATP/g-C3N4 .exhibits remarkably enhanced visible-light photocatalytic activity in degradation of methyl orange .(MO) because of its high surface area, appropriate band gap and the synergistic effect between .g-C3N4 and ATP. To achieve the best photocatalyst, the ratio of g-C3N4 was adjusted by controlling .the mass portion between ATP-KH560 and melamine (r = m (ATP-KH560) /m (melamine)). The .highest decomposition rate of methyl orange (MO) was 96.06% when r = 0.5 and this degradation .efficiency remained unchanged after 4 cycles, which is 10 times as that of pure g-C3N4 particles. .Possible photocatalytic mechanism is presented.