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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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Substantial attempts have been undertaken for the improvement of the air quality over decades; and Volatile Organic Compounds (VOCs) from the chemical and textile industries are truly listed as severe issue to be controlled. To come up with modus operandi for this issue, a novel composite of metal organic frameworks (MOFs) MIL-100(Fe) with salient tuned features of natrite was designed by a green and facile method. Mineralized composite MOFs exhibited enhanced crystallinity than pure MIL-100(Fe) as well showcased a higher surface area of 1300 m2 g−1. Through dynamic acetone pressure swing adsorption setup, MIL-0.05Na (MIL-100(Fe) synthesized with 0.05 mM Na2CO3 solution) revealed an enhanced acetone adsorption of 210 mg g 1 at room temperature. Gas phase adsorption isotherms confirmed the mono layer adsorption behavior. The kinetics models evaluated that the external mass transfer was the rate limiting step for surface adsorption. The thermodynamic study manifested that the adsorption reaction was spontaneous and exothermic. The proposed mechanism of adsorption was the act of physisorption which enriched the adsorbents reusability. This research work provides a futuristic vista to design mineralized Fe-MOFs composites for an energy saving adsorbents for VOCs removal.