Ranjit Bariki

Bio: Ranjit Bariki is an academic researcher from National Institute of Technology, Rourkela. The author has contributed to research in topics: Photocatalysis & Materials science. The author has an hindex of 4, co-authored 7 publications receiving 112 citations.

Facile synthesis and photocatalytic efficacy of UiO-66/CdIn2S4 nanocomposites with flowerlike 3D-microspheres towards aqueous phase decontamination of triclosan and H2 evolution

Abstract: Construction of porous heterostructure photocatalyst material with improved surface and optoelectrical properties is a practical and effective strategy for mineralization of toxic organic pollutants and water splitting reaction under visible light irradiation. Herein, we have developed a facile hydrothermal route to prepare a series of novel UiO-66/CdIn2S4 heterojunction nanocomposite materials containing finely dispersed UiO-66 spherical nanoparticles (20−40 nm) anchored over high aspect ratio CdIn2S4 nanosheets. Comprehensive characterization of the UiO-66/CdIn2S4 nanocomposites revealed a hierarchical 3D microflower structure with enhanced surface reactive sites, better channelization of charge carriers, high resistance to charge recombination and a favorable band alignment between the two semiconductor components. The optimal photocatalyst (30UiO-66/CdIn2S4) showed improved photocatalytic efficiency towards triclosan degradation with rate constant (0.0094 min−1) twelve times higher than the pure CdIn2S4 (0.0007 min−1). The 30UiO-66/CdIn2S4 photocatalyst also exhibited higher H2 evolution rate (2.95 mmolg−1 h−1) with apparent conversion efficiency of 20.8 %.

A facile reflux method for in situ fabrication of a non-cytotoxic Bi2S3/β-Bi2O3/ZnIn2S4 ternary photocatalyst: a novel dual Z-scheme system with enhanced multifunctional photocatalytic activity

Abstract: In this study, we have developed a novel non-cytotoxic Bi2S3/β-Bi2O3/ZnIn2S4 ternary nanocomposite using a mild in situ reflux method for multimodal applications in the fields of waste water remediation, H2 energy production and microbial disinfection. Initially, the metastable β-Bi2O3 phase with nanoplate morphology was synthesized by thermal decomposition of Bi2O2CO3. The co-assembly of Bi2S3 and ZnIn2S4 with β-Bi2O3 is achieved by a tailor made in situ reflux route using thioacetamide as the sulfur source. Comprehensive characterization of the ternary composite revealed close microscopic contact between the semiconductors, fast electron channelization, enhanced charge carrier separation and a prolonged life time (11.25 ns) of the excited state. The ternary composite exhibits excellent visible light assisted photocatalytic activity for aqueous phase tetracycline (TCN) degradation and Cr(VI) reduction achieving 96.3% (Kapp = 0.0868 min−1) and 93.7% (Kapp = 0.2236 min−1) removal in a short reaction span of 40 min and 12 min, respectively. The ternary composite also afforded a H2 generation rate of 2243 μmol h−1 g−1 with an apparent conversion efficiency of 14.3%. A bacterial inactivation study conducted using Enterobacter cloacae suggested good visible light assisted bacterial degradation activity of the coupled semiconductor system. The MTT assay study confirms the non-cytotoxic nature of the photocatalyst as well as the treated TCN and Cr(VI) solutions. A synergistic dual Z-scheme electron migration mechanism is deduced from radical trapping experiments and the ESR study which accounts for the excellent photocatalytic activity of the ternary composite material.

Facile Synthesis and Application of CdS/Bi20TiO32/Bi4Ti3O12 Ternary Heterostructure: A Synergistic Multi-heterojunction Photocatalyst for Enhanced Endosulfan Degradation and Hydrogen Evolution Reaction

Abstract: Facile fabrication of visible light responsive multicomponent heterostructure photocatalysts with synergistic photoelectron migration is an effective approach with potential application in water remediation and renewable energy generation. In this study, a series of ternary multi-heterojunction CdS/Bi20TiO32/Bi4Ti3O12 (CdSxBTC) photocatalysts were prepared by hydrothermal deposition of CdS nanoparticles (15–25 nm) over one pot combustion synthesized Bi20TiO32/Bi4Ti3O12 (BTC) nanostructures. Comprehensive characterization of the ternary composites revealed enhanced optical absorption, high interfacial contact, fast electron channelization and a prolonged excited state life time. The CdSxBTC composite materials displayed enhanced photocatalytic activity for endosulfan degradation (kapp value 6–12 times greater than pure semiconductors) and water splitting reaction (H2 production rate 1890 μmolg−1h−1 and apparent conversion efficiency 19%). The cell viability -study disclosed non-cytotoxic nature of the treated endosulfan solution. A synergistic Type-I bridged coupled Z-scheme electron migration process accounted for robust radical generation ability (•O2− and •OH) and photocatalytic activity of the ternary composites.

Architecting a Double Charge-Transfer Dynamics In2S3/BiVO4 n-n Isotype Heterojunction for Superior Photocatalytic Oxytetracycline Hydrochloride Degradation and Water Oxidation Reaction: Unveiling the Association of Physicochemical, Electrochemical, and Photocatalytic Properties.

Abstract: To surmount incompatibility provoked efficiency suppression of an anisotype heterojunction and to pursue an improved intrinsic photocatalytic activity by manipulating oriented transfer of photoindu...

In situ Irradiated XPS Investigation on S-Scheme TiO2@ZnIn2S4 Photocatalyst for Efficient Photocatalytic CO2 Reduction

Abstract: Reasonable design of efficient hierarchical photocatalysts has gained significant attention. Herein, a step-scheme (S-scheme) core-shell TiO2 @ZnIn2 S4 heterojunction is designed for photocatalytic CO2 reduction. The optimized sample exhibits much higher CO2 photoreduction conversion rates (the sum yield of CO, CH3 OH, and CH4 ) than the blank control, i.e., ZnIn2 S4 and TiO2 . The improved photocatalytic performance can be attributed to the inhibited recombination of photogenerated charge carriers induced by S-scheme heterojunction. The improvement is also attributed to the large specific surface areas and abundant active sites. Meanwhile, S-scheme photogenerated charge transfer mechanism is testified by in situ irradiated X-ray photoelectron spectroscopy, work function calculation, and electron paramagnetic resonance measurements. This work provides an effective strategy for designing highly efficient heterojunction photocatalysts for conversion of solar fuels.