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An efficient adsorbents for arsenate removal was developed by modification of calcined eggshell with goethite (calcined eggshell/goethite; sorbent 1), α-MnO 2 (calcined eggshell/α-MnO 2 ; sorbent 2) and hybride system goethite/α-MnO 2 (calcined eggshell/goethite/α-MnO 2 ; sorbent 3). Methods and processes for preparation of novel adsorbents were defined and obtained...