1. Qaiser S, Saleemi AR, Ahmad MM (2007) Heavy metal uptake by agro based waste materials. Environ Biotechnol 10:409–416
2. Wang J, Chen C (2006) Biosorption of heavy metals. Biotechnol Prog 1:235–250
3. Regine HSF, Volesky B (2000) Biosorption: a solution to pollution. Int Microbiol 3:17–24
4. Dowlatshahi S, Torbati ARH, Loloei M (2014) Adsorption of copper, lead and cadmium from aqueous solutions by activated carbon prepared from saffron leaves. J Environ Health Sci 1(1):37–44
5. Kurniawan TA, Chan GYS, Lo WH, Babel S (2006) Physico–chemical treatment techniques for wastewater laden with heavy metals. J Chem Eng 118:83–98