Rosa centifolia and Rosa gruss an teplitz distillation waste biomass was immobilized using sodium alginate for Pb(II) uptake from aqueous solutions under varied experimental conditions. The maximum Pb(II) adsorption occurred at pH 5. Immobilized rose waste biomasses were modified physically and chemically to enhance Pb(II) removal. The Langmuir sorption isotherm and pseudo-second-order kinetic models fitted well to the adsorption data of Pb(II) by immobilized Rosa centifolia and Rosa gruss an teplitz. The adsorbed metal is recovered by treating immobilized biomass with different chemical reagents ( , HCl and ) and maximum Pb(II) recovered when treated with sulphuric acid (95.67%). The presence of cometals Na, Ca(II), Al(III), Cr(III), Cr(VI), and Cu(II), reduced Pb(II) adsorption on Rosa centifolia and Rosa gruss an teplitz waste biomass. It can be concluded from the results of the present study that rose waste can be effectively used for the uptake of Pb(II) from aqueous streams. 1. Introduction Mobilization of the heavy metals in the environment due to industrial activities is of serious concern due to toxicity of these metals in human and other forms of life. Lead (II) is known to be one of the heavy metals most toxic to living organisms and is one of the more wide spread heavy metal contaminants on the environment [1]. Once it enters the environment, it is difficult to recover and it affects the human health [2]. Pb(II) is considered as neurotoxic metal when present above 0.05？mg/L in drinking water [3]. Lead is a metabolic poison and enzyme inhibitor. In young children it can cause mental retardation and semipermanent brain damage. Lead has the ability to form sites for long term release by replacing calcium in the bone. In environmental restoration areas conventional techniques used to eradicate heavy metals from wastewater include precipitation, oxidation/reduction, mechanical filtration, ion exchange resins, membrane separation, adsorption, flocculation, coagulation, and reverse osmosis [4, 5]. However, these processes can be expensive and not fully effective especially when the metal concentration is below 100？mg/L. The other drawbacks of these methods include expensive equipment and monitoring system, high reagents, energy and generation of toxic sludge which requires massive land for dumping. Biosorption has some advantages when compared with conventional methods it is nonpolluting and highly selective; more efficient; easy to operate; cost-effective for treatment of large volumes of wastewaters which contains low concentrations of metals
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