PANI载的孔状g-C3N4的界面聚合法制备与光催化性能研究

doi:10.15541/jim20150092

摘要/Abstract

摘要：

在孔状石墨型氮化碳(g-C₃N₄)存在下, 通过苯胺单体的界面聚合成功制备了孔状g-C₃N₄/聚苯胺(PANI)复合催化剂。采用XRD、FTIR、SEM、TGA、UV-Vis和电化学阻抗谱等对样品的结构、形貌、性能以及可见光催化降解亚甲基蓝的催化活性进行表征。结果表明: PANI组装在孔状g-C₃N₄片上, 此种复合结构不仅利于孔状g-C₃N₄对PANI链段运动的限制, 提高孔状g-C₃N₄/PANI复合催化剂的稳定性; 而且增强材料的可见光利用率、氧化能力和电子输运性能, 利于可见光催化性能的改善。

关键词: 孔状g-C3N4, PANI, 热稳定性, 界面聚合, 光催化性能

Abstract:

Polyaniline (PANI) was successfully loaded on porous graphitic carbon nitride (porous g-C₃N₄) by interfacial polymerization of aniline monomers. The structure, morphology and properties of the prepared samples were characterized by XRD, FTIR, SEM, TGA, UV-Vis and Electrochemical Impedance Spectroscope (EIS). Photocatalytic degradation of methylene blue was investigated to determine the photoactivity of the catalyst. The porous g-C₃N₄ showed good dispersion and interfacial adhesion to PANI, which improved the photocatalytic degradation of methylene blue and thermal stability. The improved photocatalytic activity could be attributed to the improved visible light utilization, oxidation power and electron transport property.

Key words: porous g-C3N4, PANI, thermal stability, interfacial polymerization, photocatalytic performance

中图分类号:

TQ174

李宪华, 张雷刚, 王雪雪, 于清波. PANI载的孔状g-C₃N₄的界面聚合法制备与光催化性能研究[J]. 无机材料学报, 2015, 30(10): 1018-1024.

LI Xian-Hua, ZHANG Lei-Gang, WANG Xue-Xue, YU Qing-Bo. Synthesis of Porous g-C₃N₄ Loaded With Highly Dispersed PANI by Interfacial Polymerization and Its Photocatalytic Performance[J]. Journal of Inorganic Materials, 2015, 30(10): 1018-1024.

图/表 7

图1 暗处样品的吸附曲线

Fig. 1 Adsorption of samples under dark conditions

图2 孔状 g-C3N4(1)、PANI(2)和孔状g-C3N4/PANI 复合材料(3)的XRD(a), FTIR (b)图谱和氮气吸附曲线(c)

Fig. 2 (a) XRD, (b) FTIR spectra and (c) nitrogen adsorption-desorption isotherms of porous g-C3N4 (1), PANI (2), and the porous g-C3N4/PANI composite (3)

图3 孔状 g-C3N4 (a高倍; d低倍)、PANI (b)和孔状g-C3N4/PANI 复合材料(c高倍; e低倍)的SEM照片

Fig. 3 Typical SEM images of porous g-C3N4 at (high (a) and low (d) magnification), PANI (b), and the porous g-C3N4/PANI composite at (high (b) and low (e) magnification)

图4 孔状g-C3N4/PANI 复合材料的形成过程

Fig. 4 Schematic presentation for fabrication of porous g-C3N4/PANI composite

图5 PANI(1)、孔状g-C3N4/PANI复合材料(2)和孔状g-C3N4(3)的TGA(a)、UV-Vis(b)、禁带宽度(c)和莫特-肖特基曲线(d)

Fig. 5 (a) TGA curves, (b) UV-Vis absorption spectrum, (c) plots of (αhν)2 vs photon energy (hν) for the band gap energy, and (d) Mott-Schottky plots for PANI nanorods (1), porous g-C3N4/PANI composite (2), and porous g-C3N4 (3)

图6 孔状 g-C3N4(2)和孔状g-C3N4/PANI复合材料(1)的瞬态光电流(a)和电化学阻抗谱(b)

Fig. 6 Photocurrent densities (a) and EIS spectra (b) of porous g-C3N4/PANI composite (1) and porous g-C3N4 (2)

图7 样品对亚甲基蓝的降解(a)及其ln(C0/Ct)-t曲线(b), 孔状g-C3N4/PANI 复合材料的光催化稳定性(c), 不同含量的孔状g-C3N4/PANI复合催化剂的光催化性能(d)

Fig. 7 Photocatalytic effect of the samples process of photocatalytic degradation of MB under visible light irradiation (λ>400 nm), (b) first-order plots for the photodegradation of MB, (c) recycle test of porous g-C3N4/PANI composite catalyst, and (d) photocatalytic degradation of MB in the presence of different ratio of porous g-C3N4/PANI

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PANI载的孔状g-C₃N₄的界面聚合法制备与光催化性能研究

Synthesis of Porous g-C₃N₄ Loaded With Highly Dispersed PANI by Interfacial Polymerization and Its Photocatalytic Performance

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