Introduction and fundamentals of chalcogenides and chalcogenides-based nanomaterials 1 Mohammad Mansoob Khan 2 Advances in chalcogenides and chalcogenides-based nanomaterials such as sulfides, selenides, and tellurides 7 Ersan Y. Muslih, Badrul Munir, Mohammad Mansoob Khan 3 Chalcogenides as well as chalcogenides-based nanomaterials and its importance in photocatalysis 33 Mohd Salman Siddiqui, Mohammed Aslam 4 Basic principles, fundamentals, and mechanisms of chalcogenide-based nanomaterials in photocatalytic reactions 77 G.V.S. Subbaroy Sarma, Murthy Chavali, Maria P. Nikolova, Manoj Kumar Enamala, Chandrasekar Kuppan 5 Synthesis methods for chalcogenides and chalcogenides-based nanomaterials for photocatalysis 105 Aga Ridhova, Vinda Puspasari, Muhamad I. Amal 6 Band gap engineered chalcogenide nanomaterials for visible light-induced photocatalysis 135 Dehua Xia, Qi Chen, Zhiyao Li, Manhui Luo, Po Keung Wong 7 Chalcogenide-based nanomaterials as photocatalysts for water splitting and hydrogen production 173 Hossam A. El Nazer, Yasser Mahmoud A. Mohamed 8 Chalcogenides-based nanomaterials for solar cells and dye sensitized solar cells 185 Ho Soonmin, S.S. Hegde, K. Ramesh, J.K. Dongre, Yousaf Hameed Khattak, Xiang-Hua Zhang, Sadanand, D.K. Dwivedi, D.A. Oeba 9 Chalcogenides-based nanomaterials for artificial photosynthesis 219 Theivasanthi Thirugnanasambandan 10 Use of chalcogenides-based nanomaterials for wastewater treatment including bacterial disinfection and organic contaminants degradation 243 Manoj Kumar Enamala, Murthy Chavali, Amala Tangellapally, Divya Pasumarthy, Mannam Krishna Murthy, Chandrasekhar Kuppam, Vishal Chaudhary, Roli Mishra, Divya Naradasu 11 Use of chalcogenides-based nanomaterials for photocatalytic heavy metal reduction and ions removal 261 Metwally Madkour, Hossam A. El Nazer, Yasser K. Abdel-Monem 12 Photocatalytic N2 fixation using chalcogenide-based nanomaterials 281 Yasser Mahmoud A. Mohamed, Hossam A. El Nazer, Elzahraa A. Elgohery, Mohammad Mansoob Khan 13 Photocatalytic CO2 reduction using chalcogenide-based nanomaterials 291 Magdeline Tze Leng Lai, Chin Wei Lai, Joon Ching Juan 14 Challenges, novel applications, and future prospects of chalcogenides and chalcogenide-based nanomaterials for photocatalysis 303 Mehmet Ates, Ersen Yilmaz, Mehmet Kayra Tanaydin