photocatalytic removal of malachite green dye from aqueous solutions by nano-composites containing titanium dioxide: a systematic review

Background: malachite green (mg) is widely used as a fungicide, bactericide parasiticide in the aquaculture industry, as a food additive, medical disinfectant, and also, as a dye for materials such as silk, leather, paper, etc. in this study, the photocatalytic removal of mg from aqueous solutions using tio_2 containing nanocomposites was reviewed. methods: in this study, four databases (pubmed, web of science, sciencedirect, and scopus) were systematically searched to collect studies on the decomposition of mg using nanocomposites containing tio_2 under uv light radiation. results: in total, 10 related and eligible studies were selected. based on the results, tio_2 was doped with iron, sn, ag, si, and ni. the highest percentage of photocatalytic decomposition for mg was observed in sn > ni > ag > fe > si. the removal efficiency of mg in the studied papers was between 75%100%. conclusion: recombinant nanocomposites had a higher dye removal percentage than uncombined ones because they play an important role in the photocatalytic process of dye, by producing free radicals.