Selenium in its oxyanion form is major cause of contamination in mining aqueous waste streams. The aqueous oxyanions are rather more toxic than elemental form of selenium. Excessive intake of Selenium can cause dizziness, fatigue, irritations of the mucous membranes, collection of fluid in the lungs and bronchitis. Therefore, research is required to explore efficient methods for abetment of excessive toxic Selenium from contaminated water. In the present investigation, initially 4-HAOT-II co-polymer was synthesized in the laboratory and its structure has been assigned based on physico-chemical evidences. This co-polymer was subjected to surface modification employing molecular adsorption deposition method. This improved surface modified co-polymer has been characterisized using modern techniques like FTIR, SEM and XRD. It was tested for selenium removal efficiency from contaminated water. The material reported in the present article has shown an excellent efficacy towards removal of excessive toxic oxyanion Selenium from contaminated water. Thus, it can be used successfully for wastewater treatment.