Production of Biosorbents from Agricultural by-product and theirs Adsorption Characteristics for Metal ions

The project concerns to adsorptive elimination of heavy metal ions from aqueous solution, namely to synthesis, modifying, studying of properties and to application combined biosorbents on the base of materials from agricultural by products. The main purpose is preparation of effective biosorbents for elimination of heavy metals ions from aqueous systems. The potential to remove metal ions from aqueous solutions through biosorption using the straws and shells of agricultural by products (such as barley, hazelnut etc.) was investigated. The batch experiments will be completed previous studies will be discussed. The effects of the significant process parameters such as initial pH, change in pH during adsorption, contact time, adsorbent amount, and the initial metal ion concentration will interpreted from the data realized from batch studies. These low-cost adsorbents developed from the naturally and abundantly available are biodegradable. The advantages of these materials include availability, low-cost, and a reasonable metal sorption capacity. Within their complex structure, agro-waste materials have functional groups that play a major role in metal ion sorption. Agro-waste materials functional groups are associated, in part, to carboxyl, hydroxyl groups and phenolic: these oxygen-containing sites play an important role in the metal ion removal. The most probable metal sorption mechanisms are ion exchange and complexation and partly physical adsorption and electrostatic attraction.