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The functional organic ligand of 4-tert-Octyl-4-((phenyl)diazenyl)phenol (TPDP) was immobilized directly onto the mesoporous silica for the fabrication of composite adsorbent to detect and remove the toxic copper (Cu(II)) ions from contaminated water. The mesoporous silica and the composite adsorbent were characterized systematically using different instrumentations. Upon addition of a trace amount of Cu(II) with composite adsorbent, a significant color was formed to visualize the Cu(II) ion detection at optimum experimental protocol. The pH played a key factor in the detection and removal operation and the optimum pH was 4.0 for this study. The effect of pH, color optimization, contact time, competing ions, and concentration was assessed systematically both in the detection and removal operations. The limit detection by the composite adsorbent to Cu(II) ion was 0.28 µg/L. The diverse metal ions did not interfere …