JEAS  Vol.7 No.2 , June 2017
Adsorptive Removal from Aqueous Solution of Cr(VI) by Green Moringa Tea Leaves Biomass
Abstract: Hexavalent chromium, Cr(VI), is a toxic metal present in industrial effluents. The study was carried to test the use of green Moringa leaves biomass as adsorbent for Cr(VI) from aqueous solutions. Batch adsorption method was used and the concentration of Cr(VI) measured using an ultraviolet-visible (UV-Vis) spectrophotometry. The effects of the adsorption contact time, adsorbent dosage, pH, initial adsorbate concentration and temperature were studied. Results show maximum removal of Cr(VI) of 99% ± 1%, with maximum adsorption capacity of 33.9 mg/g at a pH 2, 60 minutes contact time and 100 mg/l initial Cr(IV) concentration. The Langmuir and Freundlich adsorption isotherm models were used to fit the experimental data. The data showed that adsorption on green Moringa oleifera leaves tea biomass fitted well to Freundlich isotherm (r2 = 0.9432) compared to the Langmuir isotherm (r2 = 0.9122). M. oleifera leaves biomass can be used in water purification systems. The sludge of M. oleifera leaves is biodegradable, cost effective and environmentally friendly and therefore attractive in hexavalent chromium removal in water.
Cite this paper: Timbo, C. , Kandawa-Schulz, M. , Amuanyena, M. and Kwaambwa, H. (2017) Adsorptive Removal from Aqueous Solution of Cr(VI) by Green Moringa Tea Leaves Biomass. Journal of Encapsulation and Adsorption Sciences, 7, 108-119. doi: 10.4236/jeas.2017.72008.

[1]   Fu, F. and Wang, Q.I. (2011) Removal of Heavy Metal Ions from Wastewaters: A Review. Journal of Environmental Management, 92, 407-418.

[2]   Kwaambwa, H.M., Chimuka, L., Kandawa-Schulz, M., Munkombwe, N.M. and Thwala, J.M. (2012) Situational Analysis and Promotion of the Cultivation and Utilisation of the Moringa oleifera Tree in Selected Sub-Saharan Africa Countries. Progress Multi-Disciplinary Research Journal, 4, 9-40.

[3]   Vargas-Nieto, C., Carriazo, J.G. and Castillo, E. (2011) A Study of Low-Cost Adsorbent Materials for Removing Cr(VI) from Aqueous Waste Effluent. Ingeniería E Investigación, 31, 154-162.

[4]   Veena Devi, B., Jahagirdar, A.A. and Zulfiqar Ahmend, M.N. (2012) Adsorption of Chromium on Activated Carbon Prepared from Coconut Shell. International Journal of Engineering Research and Applications, 2, 364-370.

[5]   Venkateswarlu, P., Venkata Ratnam, M., Rao, D. and Rao, M. (2007) Removal of Chromium from an Aqueous Solution Using Azadirachta indica (neem) Leaf Powder as an Adsorbent. International Journal of Physical Sciences, 2, 188-195.

[6]   Bansal, M., Singh, D., Garg, V.K. and Rose, P. (2008) Mechanisms of Cr(Vi) Removal from Synthetic Wastewater by Low Cost Adsorbents. Journal of Environmental Research and Development, 3, 228-243.

[7]   Chen, P., Xiong, Z., Luo, J., Lin, J. and Tan, K.L. (2002) Interaction of Hydrogen with Metal Nitrides and Imides. Nature, 420, 302-304.

[8]   Jeyaseelan, C. and Gupta, A. (2016) Green Tea Leaves as a Natural Adsorbent for the Removal of Cr(VI) from Aqueous Solutions. Air, Soil and Water Research, 9, 13-19.

[9]   Dehghani, M.H., Sanaei, D., Ali, I. and Bhatnagar, A. (2016) Removal of Chromium(VI) from Aqueous Solution Using Treated Waste Newspaper as a Low-Cost Adsorbent: Kinetic Modeling and Isotherm Studies. Journal of Molecular Liquids, 215, 671-679.

[10]   Gebrehawaria, G., Hussen, A. and Rao, V.M. (2015) Removal of Hexavalent Chromium from Aqueous Solutions Using Barks of Acacia albida and Leaves of Euclea schimperi. International Journal of Environmental Science and Technology, 12, 1569-1580.

[11]   Taheryan, P., Shahidi, A. and Najafi Mood, M.H. (2015) Removal Performance Assessment of Chromium (VI) in Solution Using Grape Leaves Powder and Carbon as Adsorbent. International Journal of Research Studies in Agricultural Sciences, 1, 21-28.

[12]   Mckay, G., Blair, H.S. and Gardener, J.K. (1982) Adsorption of Dyes on Chitin. Equilibrium Studies. Journal of Applied Polymer Science, 27, 3043-3057.

[13]   Guo, Y.P, Yang, S.F, Yu, K.F, Wang, Z.C. and Xu, H.D. (2002) Adsorption of Cr(VI) on Micro- and Mesoporous Rice Husk-Based Active Carbon. Materials Chemistry and Physics Journal, 78, 132-137.

[14]   Mohanty, S., Bal, B. and Das, A.P. (2014) Adsorption of Hexavalent Chromium onto Activated Carbon. Austin Journal of Biotechnology & Bioengineering, 1, 5.

[15]   Gupta, S. and Babu, B.V. (2006) Adsorption of Cr(VI) by a Low-Cost Adsorbent Prepared from Neem Leaves. Proceedings of National Conference on Environmental Conservation, 1-3, 175-180.

[16]   Vinodhini, V. and Das, N. (2010) Relevant Approach to Assess the Performance of Sawdust as Adsorbent of Chromium (VI) Ions from Aqueous Solutions. International Journal of Environmental Science and Technology, 7, 85-92.

[17]   Munir, K., Yusuf, M., Noreen, Z., Hameed, A., Hafeez, F.Y. and Faryal, R. (2010) Isotherm Studies for Determination of Removal Capacity of Bi-Metal (Ni and Cr) Ions by Aspergillus niger. Pakistan Journal of Botany, 42, 593-604.

[18]   Dakiky, M., Khamis, M., Manassra, A. and Mereb, M. (2002) Selective Adsorption of Chromium (VI) in Industrial Wastewater Using Low-Cost Abundantly Available Adsorbents. Advances in Environmental Research Journal, 6, 533-540.

[19]   Dhanakumar, S., Solaraj, G., Mohanraj, R. and Pattabh, S. (2007) Removal of Cr (VI) from Aqueous Solution by Adsorption Using Cooked Tea Dust. Indian Journal of Science and Technology, 1, 1-6.