title: Facile synthesis of 3D porous thermally exfoliated g-C3N4 nanosheet with enhanced photocatalytic degradation of organic dye.
abstract: 3D porous framework composed of exfoliated ultrathin nanosheets is a hot topic in the field of energy storage and conversion. A facile method to prepare 3D mesoporous C3N4 with few-layered nanosheets interconnected in large quantity via H2SO4 intercalation and subsequent thermal treatment was described herein. The obtained thermally-exfoliated C3N4 (TE-C3N4) was thoroughly characterized by scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FTIR) spectroscopy, atomic force microscopy (AFM), UV-Vis diffuse reflectance spectroscopy (DRS) and Brunauer-Emmett-Teller (BET) measurements. The detailed analysis indicated that TE-C3N4 possessed enlarged inter-layer space, enhanced UV-light adsorption and high specific surface area with 3D interconnected structure composed of ultrathin 2D nanosheets. Compared to bulk C3N4, TE-C3N4 showed an enhanced photocatalytic activity for photodegradation of Rhodamine B under UV-light irradiation and exhibited no significant loss of photocatalytic activity after 11 recycled runs. The pseudo-first reaction rate constant for TE-C3N4 was about four times higher than that for pure bulk-C3N4. The better photocatalytic performance could be attributed to more active catalytic sites, prolonged photo-excited carrier lifetime and shorted pathway of the carriers to the reaction sites.
authors: College of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing 400074, China. Electronic address: yuanxy@cqjtu.edu.cn.
authors: Xiaoya
authors: X
authors: Yuan
authors: College of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing 400074, China.
authors: Chou
authors: C
authors: Zhou
authors: College of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing 400074, China.
authors: Yanrong
authors: Y
authors: Jin
authors: College of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing 400074, China.
authors: Qiuye
authors: Q
authors: Jing
authors: College of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing 400074, China.
authors: Yaling
authors: Y
authors: Yang
authors: College of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing 400074, China.
authors: Xu
authors: X
authors: Shen
authors: College of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing 400074, China.
authors: Qi
authors: Q
authors: Tang
authors: College of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing 400074, China.
authors: Yuanhua
authors: Y
authors: Mu
authors: Chongqing Academy of Science and Technology, Chongqing 401123, China.
authors: An-Ke
authors: AK
authors: Du
keywords: C(3)N(4) nanosheets; Mesoporous; Photocatalytic degradation; Thermal exfoliation