SrTiO3, Bi2S3, and SrTiO3/Bi2S3 heterojunction were prepared for efficient photocatalytic hydrogen production. SrTiO3/Bi2S3 heterojunction was prepared by different weight percentages of Bi2S3 (1, 3, 5, and 7%) with SrTiO3. SrTiO3 and Bi2S3 are exhibited in cubic and orthorhombic crystal structures, respectively. The morphologies of SrTiO3 and Bi2S3 have existed as nanocubic and bar-like structures, respectively. Transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) results further confirmed the formation of SrTiO3/Bi2S3 heterojunction. The photoluminescence (PL) and electrochemical impedance spectroscopy (EIS) results indicated that the SrTiO3/Bi2S3 heterojunction reduces the rate of photogenerated electron–hole pair recombination and electron-transfer resistance than pure SrTiO3 and Bi2S3. The formation of SrTiO3/Bi2S3 heterojunction effectively separates the photogenerated charge carriers, which enhances the photocatalytic hydrogen production under UV light. The SrTiO3/Bi2S3 heterojunction shows superior photocatalytic hydrogen production than bare SrTiO3 and Bi2S3 due to the synergistic effect. The photocatalytic hydrogen production of SrTiO3/Bi2S3 (5%) gives 7.7 mmol g–1 within 180 min under UV irradiation.

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Norfloxacin (NF) is an emerging antibiotic contaminant due to its significant accumulation in the environment. Photocatalytic degradation is an effective method for removing emerging contaminant compounds in aqueous solution; however, it is not commonly applied because of the poor solubility of contaminant compounds in water. In this study, a photocatalytic degradation experiment was carried out on NF using a self-made ceria catalyst. At an initial concentration of NF of 2.5 mg L−1, the dosage of CeO2 was 0.1 g L−1 photocatalyst in water, and the initial pH of the NF solution was 8.0. With a reaction time of 180 min, the total removal rate of NF could reach 95%. Additionally, the studies on hydrogen production show that the maximum hydrogen production with 2% Fe–CeO2 can reach 25,670 μmol h−1 g−1 under close to 8 W of 365 nm, a methanol concentration of 20%, and a catalyst dose of 0.1 g L−1 photocatalyst in water. Furthermore, the intensities of photoluminescence (PL) emission peaks decreased with increased Fe-doped amounts on CeO2, suggesting that the irradiative recombination seemed to be weakened.