title: Synthesis of hydrophobic cross-linked polyzwitterionic acid for simultaneous sorption of Eriochrome black T and chromium ions from binary hazardous waters.
abstract: Hydrophobic cross-linked polyzwitterionic acid (HCPZA) containing long chain (C18) hydrophobes and residues of a glutamic acid having unquenched nitrogen valency was synthesized. Exploiting the chelating ability of the amino acid residues to scavenge toxic metals and the hydrophobic surface to scoop up the organic contaminants, the resin HCPZA was evaluated for simultaneous removal of chromium and Eriochrome black T (EBT) from wastewaters. The structure and morphology of the polymer before and after sorption were characterized by using FTIR, TGA, EDX and SEM. The effect of various parameters such as contact time, pH and initial concentrations were investigated to arrive at optimum conditions. The adsorption of Eriochrome black T and Cr (III) on HCPZA reached equilibrium in 30 min. The mechanism of adsorption was investigated using kinetic, diffusion and isotherm models. The adsorption kinetic data were described well by the pseudo-second order model and by the Freundlich isotherm model. EDX analysis confirmed the adsorption of Cr (III) and EBT on the polymer. The hydrophobic resin exhibited a remarkable simultaneous adsorption capacity for EBT and Cr (III) and thus demonstrated its potential to be a promising adsorbent for removal of dyes and heavy metal ions from wastewaters.
authors: Department of Chemistry, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia. Electronic address: tawfik@kfupm.edu.sa.
authors: Tawfik A
authors: TA
authors: Saleh
authors: Department of Environmental Science, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia.
authors: Auwal M
authors: AM
authors: Musa
authors: Department of Chemistry, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia.
authors: Shaikh A
authors: SA
authors: Ali
mesh_terms: D000327:Adsorption; D001391:Azo Compounds / Q000737:chemistry* / Q000302:isolation & purification*; D002857:Chromium / Q000737:chemistry* / Q000302:isolation & purification*; D003432:Cross-Linking Reagents / Q000737:chemistry; D018698:Glutamic Acid / Q000138:chemical synthesis / Q000737:chemistry*; D015386:Hazardous Substances / Q000737:chemistry; D057927:Hydrophobic and Hydrophilic Interactions; D007477:Ions / Q000737:chemistry; D015394:Molecular Structure; D011108:Polymers / Q000138:chemical synthesis* / Q000737:chemistry; D013499:Surface Properties; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000302:isolation & purification*
chemical_list: D001391:Azo Compounds; D003432:Cross-Linking Reagents; D015386:Hazardous Substances; D007477:Ions; D011108:Polymers; D014874:Water Pollutants, Chemical; D002857:Chromium; D018698:Glutamic Acid; C014527:Eriochrome Black T
keywords: Adsorption; Chromium; Eriochrome black T (EBT); Hydrophobic cross-linked polyzwitterionic; Water treatment