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The excessive phosphate (P(V)) removal is a key factor to control the eutrophication. The ligand based composite adsorbent was fabricated from the stand point of ion-exchange adsorption, eletroselectivity and hydrogen bonding mechanism. The mesoporous silica and ligand embedded composite adsorbent were characterized to understand ordered porosity in the frameworks. The composite adsorbent was protonated before going to start the adsorption by using 2.0 M HCl. In this work, the competitive adsorption of the similar chemical properties and ionic radii of arsenic and phosphate was also evaluated. The adsorbent was exhibited rapid adsorption, significant selectivity and high adsorption capacity. Remarkably, this adsorbent demonstrated the adsorption in low pH area; however, the neutral pH 7.0 was selected to expel the competing ions. The adsorption process was fitted to the Langmuir model …