Hydrothermal synthesis of novel 1-aminoperylene diimide/TiO2/MoS2 composite with enhanced photocatalytic activity

Abstract

Abstract1-aminoperylene diimide/TiO2/MoS2 composite (NH2-PDI/TiO2/MoS2) with ordered structure was prepared by hydrothermal synthesis method. The composite was characterized by XRD, SEM, FTIR, XPS, BET, DRS, PL, EIS, Raman, photocurrent, and Mott-Schottky plots spectroscopy. The potential positions of the conduction and valence bands, and the band gap energy of the semiconductors were estimated. The composite exhibited higher photocatalytic activity compared with the mono-component systems. The apparent rate constants (k) were determined as 0.00616, 0.00352, 0.00738, 0.00517, 0.00752, and 0.00806 min−1 for TiO2, NH2-PDI, NH2-PDI/TiO2, MoS2, MoS2/TiO2, and NH2-PDI/TiO2/MoS2, respectively. The detection of radical scavengers confirmed that superoxide radicals, photogenerated holes, and photogenerated electrons were the main active substances for MB degradation. Between type II- heterojunction mechanism and Z-scheme mechanism, the latter could explain the enhanced photocatalytic activity of the composite better. The Z-scheme mechanism accumulates more electrons at CB level of NH2-PDI and hence generates more super oxide radicals.

Bifunctional MoS2/TiO2 Nanoparticles for Hydrodeoxygenation of Oleic Acid and Photodegradation of Carbonaceous Deposits

“…Moreover, MoS 2 also provides electron-trapping sites for the suppression of charge carrier recombination as seen in the quenching of PL emission intensity. , For the photocatalytic study, methylene blue was selected as a model compound for the determination of the photocatalytic efficiency of MoS 2 /TiO 2 nanoparticles under UV light and the results are shown in Table and Figure S5. In comparison, bare TiO 2 exhibits 99.48% degradation ( k = 0.0313 min –1 ) while MoS 2 exhibits only 22.94% degradation ( k = 0.0014 min –1 ) due to low absorption in UV light . For MoS 2 /TiO 2 , the photocatalytic efficiency of 5MoTi is quite low compared to that of bare TiO 2 .…”

“…In comparison, bare TiO 2 exhibits 99.48% degradation (k = 0.0313 min −1 ) while MoS 2 exhibits only 22.94% degradation (k = 0.0014 min −1 ) due to low absorption in UV light. 61 For MoS 2 /TiO 2 , the photocatalytic efficiency of 5MoTi is quite low compared to that of bare TiO 2 . However, with increasing MoS 2 mass loading, the efficiency was markedly increased in % degradation (89.00% for 10MoTi and 98.47% for 20MoTi) with the improved kinetic rate (k = 0.0112 min −1 for 10MoTi and k = 0.0189 min −1 for 20MoTi), which might be due to the dominant factor in the high surface area of the catalyst.…”

Review of Characteristics and Properties of Fe2o3/Sio2 as Water Pollution Prevention

“…This step is useful for removing hydroxide residues and increasing ZnO crystallinity which can be a photocatalytic material for purifying acid red 14, methylene blue, and methyl orange water [55]. Yongshan Ma et al's research results [56] successfully synthesized ternary composites using the hydrothermal synthesis method. With this method, the photoelectrochemical measurement results show that the photocurrent performance of the ternary composite photocatalyst is superior to that of binary composites or NH2-PDI, MoS2, or pure TiO2.…”

“…With this method, the photoelectrochemical measurement results show that the photocurrent performance of the ternary composite photocatalyst is superior to that of binary composites or NH2-PDI, MoS2, or pure TiO2. NH2-PDI/TiO2/MoS2 exhibited excellent photocatalytic activity and high stability [56].…”

TiO2/In2S3 S-scheme photocatalyst with enhanced H2O2-production activity

“…The modification techniques improve H 2 O 2 productivity by effectively inhibiting decomposition and promoting interfacial charge separation. Compared with numerous modification strategies, coupling TiO 2 with narrow band gap semiconductors has been considered as an efficient strategy to enhance the performance of photocatalysts [34][35][36][37][38].…”