ABSTRACT
Toxic heavy metals are released into the environment from a number of industries, including petroleum, petrochemical, mining, plating, dyeing, automobile manufacturing, and metal processing. The presence of heavy metals in the environment resulted in a number of environmental problems. Rice husk is insoluble in water, has good chemical stability, has high mechanical strength, and possesses a granular structure, making it a good adsorbent material for treating heavy metals from wastewater. Concentration is another major factor that influences heavy metal sorption capacity of rice husk. Utilization of a mixture of sorbents instead of a single sorption agent like rice husk is more beneficial and effective. The concentration of metal ions in solution is one other important factor that should be considered when conducting sorption studies by any agri-waste like rice husk. Thermodynamics is a very important parameter in sorption processes to determine the energy requirement and mechanism of sorption.
