Thiacalix[4]arene-functionalized magnetic xanthan gum (TC4As-XG@Fe3O4) as a hydrogel adsorbent for removal of dye and pesticide from water medium

•A thiacalix[4]arene functionalized XG was fabricated as an efficient adsorbent system.•ECH-modified TC4As bonded to Fe3O4@XG-NH2 to get the TC4As-XG@Fe3O4.•Great adsorption capacity (769.23 and 833.33 mg/g ) of CPF and CV from water was achieved.•Pseudo second-order kinetic and freundlich isotherm well described the adsorption data.•The TC4As-XG@Fe3O4 exhibited regeneration ability at least for three cycles.