ABSTRACT: The A novel colorimetric sensor based on TiO2/ poly(acryl amide-co-methylen bis acrylamideco-dithizone) (TiO2/poly(Am-co-MBAco- DTz)) nanocomposite was synthesized by surface modification of a synthesized TiO2 NPs using vinyl linker, which created a reactive vinyl groups for the polymerization of the Am, MBA and modified dithizone on the surface of modified TiO2 NPs. The prepared polymeric nanocomposite was characterized by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), there mogravimetric analysis (TGA) and X-ray powder diffraction (XRD). A fast, selective and inexpensive screening-test for recognizing Hg ions contamination in aqueous solution is described to avoid time-consuming and costly determination using atomic absorption spectrometry. This nanostructured composite with polymeric shell contain dithizone was developed as a sensitive and selective sensor for adsorption and detection of mercury ions from aqueous solution at optimized condition. Living things such as animals, humans and plants required some basic needs such as air, food and water that are clean and adequate for continue survive. However, due to the growth of industrialization and urbanization, environmental sources, especially of water, have been polluted and this is predicted to become worse over time. This global issue is caused by agricultural
