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 TiO2-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 TiO2 under UV light radiation. Results: In total, 10 related and eligible studies were selected. Based on the results, TiO2 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.

Background: This study aimed to evaluate the Environmental Performance Index (EPI) in the field of climate changes in Iran in 2020, to compare these indexes in the Middle East countries and developed countries, and to evaluate the relationship between these indexes and gross domestic product (GDP) in Iran and some of the Middle East countries, as well as 10 developed countries in the world. Methods: Data related to the EPI in the field of climate changes and GDP were extracted from the database of the Yale University (https://epi.yale.edu) and the World Bank. The relationship between them was investigated using linear regression analysis. Results: The results showed that in 2020, Iran was ranked fourteenth and sixth among the studied countries, in terms of carbon dioxide growth rate and black carbon growth rate, respectively. It has also been ranked first in terms of carbon dioxide from land cover. Also, Iran was ranked eleventh among the Middle East countries and developed countries in terms of methane (CH4 ) growth rate and was ranked sixth among the Middle East countries in terms of greenhouse gas (GHG) per capita and 13th among all studied countries. However, a significant relationship was observed between changes in GDP with GHG emissions of EPI (R2=0.82). Conclusion: Based on the Iran’s ranking in the field of climate change performance index, planning to reduce CHGs generation is necessary. Also, education of citizens in the field of methods to reduce greenhouse effects should be done by environmental policy makers.