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Different Ti/(I/S) composites are synthesized by sol‐gel method. The microstructure, interfacial and optical properties of the obtained different Ti/(I/S) composites are characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), X‐ray diffraction (XRD), surface area measurement (BET), and UV–vis diffused reflectance spectroscopy (UV‐Vis DRS). The results show that 5‐Ti/(I/S) composite has an obvious photocatalytic activity to rhodamine B (RhB) and the degradation rate can reach 81%, ·O2− is the key oxidative species. Moreover, 5‐Ti/(I/S) composite has good stability and repeatability. [ABSTRACT FROM AUTHOR]

Samples of biochar-coupled g-C 3 N 5 /C have been prepared using 3-amino-1,2,4-triazole and peanut oil as precursors to increase the specific surface area of g-C 3 N 5. The results showed that the specific surface area of g-C 3 N 5 /C-1.0 reached 44.7 m2 g−1, and the C/N ratio increased from 0.56 to 1.48. The weakness of its photoluminescence (PL) peak confirmed that g-C 3 N 5 /C-1.0 had the best separation of photogenerated electrons and holes. Furthermore, the fluorescence lifetime of g-C 3 N 5 /C-1.0 is extended to 6.4 ns, compared to 2.9 ns for g-C 3 N 5. Therefore, g-C 3 N 5 /C-1.0 displays superior photocatalytic activity to that of pure g-C 3 N 5 under visible-light irradiation. This is because the large specific surface area leads to increased absorption of visible light and efficient separation of electron–hole pairs. The hydrogen evolution rate of g-C 3 N 5 /C-1.0 is 303.3 μmol g−1 h−1 (cf. 67.5 μmol g−1 h−1 for g-C 3 N 5), and the photodegradation efficiency of rhodamine B (RhB) is as high as 93.7% (cf. 26.1% for g-C 3 N 5). Sample g-C 3 N 5 /C-1.0 also maintained outstanding photocatalytic stability after four cycles. Radical scavenger experiments and ESR tests have shown •O 2 − to be the main reactive species responsible for RhB degradation under visible light. • Biochar-doped g-C 3 N 5 was synthesized by one-step method with peanut oil as biochar source. • Biochar-doped g-C 3 N 5 can improve the specific surface area and light absorption ability. • g-C 3 N 5 /C-1.0 exhibited H 2 evolution of 303.3 μmol g−1 h−1, which was 4.5 times than that of pure g-C 3 N 5. • The photodegradation to rhodamine B of g-C 3 N 5 /C-1.0 can reach 93.7% after 150 min. • The g-C 3 N 5 /C-1.0 has good photocatalytic activity and chemical stability. [ABSTRACT FROM AUTHOR]

Series of visible light responsive Ag/AgBr/(I/S) composites based on I/S were synthesized by deposition-precipitation method. Methyl orange (MO) and other organic dyes were used to evaluate the photoactivity of Ag/AgBr/(I/S) composites. The results showed that Ag/AgBr/(I/S) composites display a good photocatalytic activity for organic dyes degradation. As the content of Ag/AgBr was 25 wt%, Ag/AgBr/(I/S) composites exhibited the best the photocatalytic activity for organic dyes. The degradation rate of Rhodamine B (RhB) and MO were 90% and 92% after 20 min. Furthermore, cycling experiments revealed that the 25%Ag/AgBr/(I/S) composites had long-term recycling stability. The photocatalytic mechanism of Ag/AgBr/(I/S) composites to MO degradation was studied by free radical trapping experiments and electron paramagnetic resonance (EPR) test, which indicating that photogenerated · O 2 − is the dominant reactive specie. • Ag/AgBr-I/S composite based on I/S were synthesized by deposition-precipitation method. • Ag/AgBr can improve the light absorption ability and photocatalytic property. • The photodegradation to Methyl orange of 25%-Ag/AgBr-I/S can reach 90% after 20 min. • The 25%-Ag/AgBr-I/S has good photocatalytic activity and chemical stability. [ABSTRACT FROM AUTHOR]