Ni-coordination polymer as potential remedial compound for efficient detection and seclusion of toxic aromatic dyes from contaminated water

Abstract

A parqueted 2D metal-organic framework [Ni(HBTC)(Bimb)]n(1) has been synthesized hydrothermally by means of Ni(II) ion with Benzene 1,3,5 tricarboxylic acid (BTC), 1,4-bis(imidazole-1-ylmethyl)benzene (Bimb) ligands. The (1) was employed as adsorbent for a series of 13 harmful organic dyes in contaminated water. The adsorption study shows that it exhibits good efficiency for cationic dyes like Methyl Violet (93.0%), Crystal Violet (92.0%),), Rhodamine B (87%), Rhodamine 6G (89.0%) and for Rose Bengal it is 90.0%, which is an anionic dye while for neutral dye i.e., Neutral Red it is 87.0% at ambient temperature and found that electrostatic attractions, π–π and H-bonding interactions are instrumental in dye uptake. The effect of pH was analyised and found that as pH increases the adsorption efficiency of Ni-coordination polymer increased exponentially. It shows maximum adsorption concentration than Rice husk (RH) and Saw dust (SD) for maximum dyes among all the 13 screened dyes. The detection limit of (1) for mostly adsorbed concentration of dyes, namely MV, CV, RB, NR, RhB and Rh6G, was found to be 0.70 ppm, 0.87 ppm, 1.06 ppm, 1.33 ppm, 1.34 ppm and 1.36 ppm, respectively and follows pseudo-first (MV, CV and RB) and pseudo-second (NR, RhB and Rh6G) order kinetics. The excellent adsorption and regeneration concert of (1) summit to be a potential and efficient future remedial material for detection and separation of toxic dyes from waste water contaminated by industrial effluents.