Brooks, R. M., Bahadory, M., Tovia, F. and Rostami, H., “Removal of lead from contaminated water”, International Journal of Soil, Sediment and Water, 3 (2), 14 (2010).
 Deng, Y., Gao, Z., Liu, B., Hu, X., Wei, Z. and Sun, C., “Selective removal of lead from aqueous solutions by ethylenediamine modified Attapulgite”, Chemical Engineering Journal, 223, 91 (2013).
 Wang, Z., Liu, G., Zheng, H., Li, F., Ngo, H. H., Guo, W. and Xing, B., “Investigating the mechanisms of biochar’s removal of lead from solution”, Bioresour. Technol., 177, 308 (2015).
 Moslehi, P., Shayegan, J. and Bahrpayma, S., “Performance of membrane bioreactor in removal of heavy metals from industrial wastewater”, Iranian Journal of Chemical Engineering, 5 (4), 33 (2008).
 Ge, F., Li, M. M., Ye, H. and Zhao, B. X., “Effective removal of heavy metal ions Cd2+, Zn2+, Pb2+, Cu2+ from aqueous solution by polymer-modified magnetic nanoparticles”, Journal of Hazardous Materials, 211–212, 366 (2012).
 Delavar, M., Hosseini, M. and Bakeri, Gh., “Fabrication and characterization of polycarbonate/titanium oxide nanotubes mixed matrix membranes for efficient removal of cadmium and copper from aqueous solution”, Iranian Journal of Chemical Engineering, 14 (2), 59 (2017).
 Eren, E., Afsin, B. and Onal, Y., “Removal of lead ions by acid activated and manganese oxide-coated bentonite”, Journal of Hazardous Materials, 161 (2-3), 677 (2009).
 Ghasemi, M., Ghoreyshi, A. A., Younesi, H. and Khoshhal, S., “Synthesis of a high characteristics activated carbon from walnut shell for the removal of Cr (VI) and Fe (II) from aqueous solution: Single and binary solutes adsorption”, Iranian Journal of Chemical Engineering, 12 (4), 28 (2015).
 Nam, S. W., Choi, D. J., Kim, S. K., Her, N. and Zoh, K. D., “Adsorption characteristics of selected hydrophilic and hydrophobic micropollutants in water using activated carbon”, Journal of Hazardous Materials, 270, 144 (2014).
 Zeinali, F., Ghoreyshi, A. A. and Najafpour, G., “Adsorption of volatile organic compounds from aqueous solution by granular activated carbon (GAC) in batch system”, Iranian Journal of Chemical Engineering, 8 (4), 50 (2011).
 Malik, P. K., “Dye removal from wastewater using activated carbon developed from sawdust: Adsorption equilibrium and kinetics”, Journal of Hazardous Materials, 113 (1–3), 81 (2004).
 Annadurai, G., Juang, R. S. and Lee, D. J., “Adsorption of heavy metals from water using banana and orange peels”, Water Science and Technology, 47 (1), 185 (2003).
 Kumar, A. and Kumar, V., “Equilibrium and thermodynamic studies of Cd (II) biosorption by chemically modified orange peel”, Journal of Environmental Biology, 37 (2), 201 (2016).
 Tadepalli, S., Murthy, K. S. R. and Rakesh, N. N., “Removal of Cu (II) and Fe (II) from Industrial waste water using orange peel as adsorbent in batch mode operation”, International Journal of Chem. Tech. Research, 9 (5), 290 (2016).
 Hamdaoui, O., “Removal of cadmium from aqueous medium under ultrasound assistance using olive leaves as sorbent”, Chemical Engineering and Processing: Process Intensification, 48, 1157 (2009).
 Ibrahima, T. H., Sabria, M. A., Khamisb, M. I., Elsayedb, Y. A., Sarab, Z. and Hafeza, B., “Produced water treatment using olive leaves”, Desalination and Water Treatment, 60, 129 (2017).
 Senthil Kumar, P., Gayathri, R. and Prabhu Arunkumar, R., “Adsorption of Fe(III) ions from aqueous solution by bengal gram husk powder: Equilibrium isotherms and kinetic approach”, Electronic J. of Environmental, Agricultural and Food Chemistry, 9 (6), 1047 (2010).
 Pandey, G., “Removal of Cd(II) and Cu(II) from aqueous solution using Bengal gram husk as a biosorbent”, Desalination and Water Treatment, 57 (16), 7270 (2016).
 Bhatia, A. K. and Khan, F., “Biosorptive removal of copper (II) ion from aqueous solution using lawsonia inermis plant leaf biomass”, Journal of Environment and Earth Science, 5 (5), 21 (2015).
 Pyrzyńska, K. and Bystrzejewski, M., “Comparative study of heavy metal ions sorption onto activated carbon,carbon nanotubes, and carbon-encapsulated magnetic nanoparticles”, Colloids and Surfaces, A: Physicochem. Eng. Aspects, 362 (1-3), 102 (2010).
 Fu, R., Liu, Y., Lou, Z., Wang, Z., Baig, S. A. and Xu, X., “Adsorptive removal of Pb(II) by magnetic activated carbon incorporated with amino groups from aqueous solutions”, Journal of the Taiwan Institute of Chemical Engineers, 62, 247 (2016).
 Manzoor, Q., Nadeem, R., Iqbal, M., Saeed, R. and Ansari, T. M., “Organic acids pretreatment effect on Rosa bourbonia phyto-biomass for removal of Pb(II) and Cu(II) from aqueous media”, Bioresource Technology, 132, 446 (2013).