Volume No. 7 Issue No.: 2 Page No.: 622-632 Oct. - Dec. 2012

 

SELECTIVE REMOVAL OF TOXIC METALS FROM WASTE WATER USING 2,4-DIHYDROXYPRO PIOPHENONE-ADIPAMIDE-FOR MALDEHYDE POLYMERIC CHELATING RESIN

 

Gurnule B. Wasudeo *1, Makde S. Charulata and Ahmed Mudrika2

1. Department of Chemistry, Kamla Nehru Mahavidyalaya, Sakkardara, Nagpur, Maharashtra ( INDIA)
2. Department of Chemistry, Priyadarshani College of Engineering, Nagpur, Maharashtra (INDIA)

 

Received on : July 10, 2012

 

ABSTRACT

 

The concentration of different toxic metals has increased beyond environmentally and ecologically permissible levels due to increase in industrial activity. More than 100 million people of West Bengal in India and Bangladesh are affected by drinking ground water contaminated with copper, lead, cadmium and some part of India is also affected by poisoning effects of copper, cadmium, zinc and lead. Different methods have been evolved to reduce the cadmium concentration in water in a maximum permissible level of 10 µg/L as where various methods are also available today, removal of cadmium and copper by polymeric ion-exchangers has been most effective. While chelating ion-exchange resins having specific chelating groups attached to a polymer have found extensive use in sorption of Cu2+ and Cd2+ ions. The copolymer resin 2,4-DHAAF has been synthesized by the condensation of 2,4-dihydroxypropiophenone and adipamide with formaldehyde in 1:1:2 molar ratio in presence of 2M hydrochloric acid as catalyst. The newly synthesized copolymer resin has been characterized by UV-visible, IR and proton NMR spectral studies. The copolymer 2,4-DHAAF proved to be a selective chelating ion exchange polymer for certain metals. Chelating ion-exchange properties of this polymer were studied for Fe3+, Cu2+, Ni2+, Co2+, Zn2+, Cd2+ and Pb2+ ions. A batch equilibrium method has been employed in the study of the selectivity of metal-ion uptake involving the measurements of the distribution of a given metal ion between the copolymer sample and a solution containing the metal ion. The study was carried out over a wide pH range and in media of various ionic strengths. The polymer showed higher selectivity for Fe3+, Cu2+, Ni2+ than for Co2+, Zn2+, Cd2+ and Pb+2 ions. Study of distribution ratio as a function of pH indicates that the amount of metal ion taken by resin increases with the increasing pH of the medium.

 

Keywords : Toxic metals, Ion-exchanger, Metal ion uptake, Distribution ratio, Chelating resin

 

 

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