Chapter 8
Visible-Light Photocatalytic Degradation of Heavy Metal Ion Hexavalent Chromium [ Cr ( VI )]
Priya Rawat,
Harshita Chawla,
Seema Garg,
Priya Rawat
Department of Chemistry, Amity Institute of Applied Sciences, Amity University, Sector 125, Noida, 201313, Uttar Pradesh, India
Search for more papers by this authorHarshita Chawla
Department of Chemistry, Amity Institute of Applied Sciences, Amity University, Sector 125, Noida, 201313, Uttar Pradesh, India
Search for more papers by this authorSeema Garg
Department of Chemistry, Amity Institute of Applied Sciences, Amity University, Sector 125, Noida, 201313, Uttar Pradesh, India
Search for more papers by this authorPriya Rawat,
Harshita Chawla,
Seema Garg,
Priya Rawat
Department of Chemistry, Amity Institute of Applied Sciences, Amity University, Sector 125, Noida, 201313, Uttar Pradesh, India
Search for more papers by this authorHarshita Chawla
Department of Chemistry, Amity Institute of Applied Sciences, Amity University, Sector 125, Noida, 201313, Uttar Pradesh, India
Search for more papers by this authorSeema Garg
Department of Chemistry, Amity Institute of Applied Sciences, Amity University, Sector 125, Noida, 201313, Uttar Pradesh, India
Search for more papers by this authorBook Editor(s):Sabu Thomas,
Merin Sara Thomas,
Laly A Pothen,
Sabu Thomas
Mahatma Gandhi University, Priyadarshini Hills P.O., Kottayam, India
Search for more papers by this authorMerin Sara Thomas
Mar Thoma College, Kuttapuzha P.O., Tiruvalla, India
Search for more papers by this authorLaly A Pothen
Mahatma Gandhi University, Priyadarshini Hills P.O., Kottayam, India
Search for more papers by this authorFirst published: 05 August 2022
Summary
Among various toxic elements, hexavalent chromium is also found as a toxic element in water. If its concentration is too high, it can harm people's health and even lead to cancer. So, there is a need for an effective method for removal of these contaminants from water. One of the effective methods to get rid of this toxic hexavalent chromium [Cr(VI)] is to convert it into much safer form, which is trivalent chromium [Cr(III)]. This conversion can be successfully carried out by using photoreduction. This review mainly focuses on basic mechanism involving photocatalysis using titania (TiO 2 ), and its modifications with metal oxides, metal sulfide, and noble metals and also by combination with deionization technique. The results showed enhanced photocatalytic activity due to efficient separation of photogenerated charge carriers, and a decrease in bandgap leads to shifting of adsorption spectra from UV to visible region with higher stability of photocatalyst.
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