A. Pandikumar is a scientist in the Organic and Materials Electrochemistry Division of the CSIR-Central Electrochemical Research Institute, Karaikudi, Tamil Nadu, India. He obtained his PhD in chemistry (2014) from the Madurai Kamaraj University, Madurai, India. He successfully completed his postdoctoral fellowship (2014–2016) from the University of Malaya, Malaysia, under its High Impact Research grant. He then joined the Functional Materials Division of the CSIR-Central Electrochemical Research Institute as a scientist. His current research involves development of novel materials with graphene and graphitic carbon nitride, in combination with metals, metal oxides, polymers, and carbon nanotubes, for photocatalysis, photoelectrocatalysis, dye-sensitized solar cells, and electrochemical sensor applications.K. Jothivenkatachalam is head and a professor at the Department of Chemistry, Anna University-BIT Campus, Tiruchirappalli, India. He obtained his PhD in chemistry from the University of Madras, Chennai, India. His current research focuses on photocatalysis for energy and environmental applications and his other research interests are functional materials, photocatalysis, photoelectrochemistry, photoelectrocatalysis, and dye-sensitized solar cells.S. Moscow is an assistant professor at the Department of Chemistry, University College of Engineering, BIT Campus, Tiruchirappalli, India. He has been a lecturer at AVVM Sri Pushpam College and an assistant professor at SASTRA University and Anna University-BIT Campus. He has authored and co-authored book chapters and papers in publications of international repute. His areas of research are photochemistry, geochemistry, environmental sciences, and materials chemistry.

• 1. Heterojunction Photocatalysts: Boon for Water Purification 2. Role of Heterostructure for the Photocatalytic Application 3. Type II Heterojunction Photocatalysts for Environmental Applications 4. Two-Dimensional Photocatalytic Heterojunction Hybrid Nanomaterials for Environmental Applications 5. Heterojunction Photocatalytic Materials for Energy and Environmental Applications 6. Graphitic Carbon Nitride Heterostructures for Energy and Environmental Applications 7. Graphene–Metal Oxides Nanocomposite Heterojunction as an Efficient Photocatalyst for Energy and Environmental Applications 8. Heterojunction Perovskite Oxide/Halide Materials for Photocatalytic Solar Hydrogen Production 9. Deep Eutectic Solvent–Assisted Synthesis of Bismuth-Based Heterostructured Photocatalysts for Water Splitting and Wastewater Treatment 10. Synergistic Effect of ZnO and g-C3N4: Photocatalytic Activity Toward Cost-Effective Decomposition of Toxic Organic Dyes 11. Nanostructured Metal Oxide and Hybrid Photocatalyst for Water Treatment and Hydrogen Generation 12. Two-Dimensional-Based Hybrid Materials for Photocatalytic and Electrochemical Conversion from Carbon Dioxide to Hydrocarbon Fuels

A. Pandikumar is a scientist in the Organic and Materials Electrochemistry Division of the CSIR-Central Electrochemical Research Institute, Karaikudi, Tamil Nadu, India. He obtained his PhD in chemistry (2014) from the Madurai Kamaraj University, Madurai, India. He successfully completed his postdoctoral fellowship (2014–2016) from the University of Malaya, Malaysia, under its High Impact Research grant. He then joined the Functional Materials Division of the CSIR-Central Electrochemical Research Institute as a scientist. His current research involves development of novel materials with graphene and graphitic carbon nitride, in combination with metals, metal oxides, polymers, and carbon nanotubes, for photocatalysis, photoelectrocatalysis, dye-sensitized solar cells, and electrochemical sensor applications.K. Jothivenkatachalam is head and a professor at the Department of Chemistry, Anna University-BIT Campus, Tiruchirappalli, India. He obtained his PhD in chemistry from the University of Madras, Chennai, India. His current research focuses on photocatalysis for energy and environmental applications and his other research interests are functional materials, photocatalysis, photoelectrochemistry, photoelectrocatalysis, and dye-sensitized solar cells.S. Moscow is an assistant professor at the Department of Chemistry, University College of Engineering, BIT Campus, Tiruchirappalli, India. He has been a lecturer at AVVM Sri Pushpam College and an assistant professor at SASTRA University and Anna University-BIT Campus. He has authored and co-authored book chapters and papers in publications of international repute. His areas of research are photochemistry, geochemistry, environmental sciences, and materials chemistry.

• 1. Heterojunction Photocatalysts: Boon for Water Purification 2. Role of Heterostructure for the Photocatalytic Application 3. Type II Heterojunction Photocatalysts for Environmental Applications 4. Two-Dimensional Photocatalytic Heterojunction Hybrid Nanomaterials for Environmental Applications 5. Heterojunction Photocatalytic Materials for Energy and Environmental Applications 6. Graphitic Carbon Nitride Heterostructures for Energy and Environmental Applications 7. Graphene–Metal Oxides Nanocomposite Heterojunction as an Efficient Photocatalyst for Energy and Environmental Applications 8. Heterojunction Perovskite Oxide/Halide Materials for Photocatalytic Solar Hydrogen Production 9. Deep Eutectic Solvent–Assisted Synthesis of Bismuth-Based Heterostructured Photocatalysts for Water Splitting and Wastewater Treatment 10. Synergistic Effect of ZnO and g-C3N4: Photocatalytic Activity Toward Cost-Effective Decomposition of Toxic Organic Dyes 11. Nanostructured Metal Oxide and Hybrid Photocatalyst for Water Treatment and Hydrogen Generation 12. Two-Dimensional-Based Hybrid Materials for Photocatalytic and Electrochemical Conversion from Carbon Dioxide to Hydrocarbon Fuels

A. Pandikumar is a scientist in the Organic and Materials Electrochemistry Division of the CSIR-Central Electrochemical Research Institute, Karaikudi, Tamil Nadu, India. He obtained his PhD in chemistry (2014) from the Madurai Kamaraj University, Madurai, India. He successfully completed his postdoctoral fellowship (2014–2016) from the University of Malaya, Malaysia, under its High Impact Research grant. He then joined the Functional Materials Division of the CSIR-Central Electrochemical Research Institute as a scientist. His current research involves development of novel materials with graphene and graphitic carbon nitride, in combination with metals, metal oxides, polymers, and carbon nanotubes, for photocatalysis, photoelectrocatalysis, dye-sensitized solar cells, and electrochemical sensor applications.K. Jothivenkatachalam is head and a professor at the Department of Chemistry, Anna University-BIT Campus, Tiruchirappalli, India. He obtained his PhD in chemistry from the University of Madras, Chennai, India. His current research focuses on photocatalysis for energy and environmental applications and his other research interests are functional materials, photocatalysis, photoelectrochemistry, photoelectrocatalysis, and dye-sensitized solar cells.S. Moscow is an assistant professor at the Department of Chemistry, University College of Engineering, BIT Campus, Tiruchirappalli, India. He has been a lecturer at AVVM Sri Pushpam College and an assistant professor at SASTRA University and Anna University-BIT Campus. He has authored and co-authored book chapters and papers in publications of international repute. His areas of research are photochemistry, geochemistry, environmental sciences, and materials chemistry.

• 1. Heterojunction Photocatalysts: Boon for Water Purification 2. Role of Heterostructure for the Photocatalytic Application 3. Type II Heterojunction Photocatalysts for Environmental Applications 4. Two-Dimensional Photocatalytic Heterojunction Hybrid Nanomaterials for Environmental Applications 5. Heterojunction Photocatalytic Materials for Energy and Environmental Applications 6. Graphitic Carbon Nitride Heterostructures for Energy and Environmental Applications 7. Graphene–Metal Oxides Nanocomposite Heterojunction as an Efficient Photocatalyst for Energy and Environmental Applications 8. Heterojunction Perovskite Oxide/Halide Materials for Photocatalytic Solar Hydrogen Production 9. Deep Eutectic Solvent–Assisted Synthesis of Bismuth-Based Heterostructured Photocatalysts for Water Splitting and Wastewater Treatment 10. Synergistic Effect of ZnO and g-C3N4: Photocatalytic Activity Toward Cost-Effective Decomposition of Toxic Organic Dyes 11. Nanostructured Metal Oxide and Hybrid Photocatalyst for Water Treatment and Hydrogen Generation 12. Two-Dimensional-Based Hybrid Materials for Photocatalytic and Electrochemical Conversion from Carbon Dioxide to Hydrocarbon Fuels