REMOVAL OF LEAD(II) BY ADSORPTION ONTO WASTE IRON(III) CHROMIUM(III) HYDROXIDE FROM AQUEOUS-SOLUTION AND RADIATOR MANUFACTURING-INDUSTRY WASTE-WATER

''Waste'' iron(III)/chromium(III) hydroxide has been used as an adsorb ent for the effective removal of Pb(II) from aqueous solution. The par ameters-studied include agitation time,; Pb(II) concentration, tempera ture, and pH. The percent adsorption of Pb(II) increased with a decrea se in concentration of Pb(II) and an increase in temperature and pH. Q uantitative removal of Pb(II) was observed at pH > 7.0. The equilibriu m data fit well with the Langmuir isotherm. The adsorption capacity (Q (0)) calculated from Langmuir isotherm was 126.55 mg/g at an initial p H of 3.5 at 30 degrees C. Desorption of Pb(II) from Pb loaded adsorben t was 56% at pH 4.0. Application of the adsorbent was successfully dem onstrated using the radiator manufacturing industry wastewater.