Characterization and Utilization of Sulphuric Acid and Bitter Leaf Extract Activated Carbon from Rice Husk for Zn(II) Adsorption

Ilesanmi Osasona(1*), Ujiro Bestow Kanuhor(2)

(1) Department of Chemical Sciences, Afe Babalola University, Km 8.5, Afe Babalola Way, P.M.B. 5454, Ado-Ekiti, Nigeria
(2) Department of Chemical Sciences, Afe Babalola University, Km 8.5, Afe Babalola Way, P.M.B. 5454, Ado-Ekiti, Nigeria
(*) Corresponding Author


The world is clamoring for green synthetic modes of scientific and technological operations. From this point of view, an attempt was made to prepare activated carbon from rice husk using aqueous bitter leaf extract and a mineral acid (H2SO4) separately. The surface characteristics and the adsorption properties of the activated carbons from both methods were compared. The effects of adsorption variables on the adsorption of Zn(II) by bitter leaf extract activated carbon (RHAC1) and H2SO4 activated carbon (RHAC2) were conducted through batch studies. The morphological characterization revealed RHAC1 to be fibrous, more porous and contained finer particles than the chemical-activated counterpart. The role of hydroxyl and carbonyl groups in the adsorption of Zn(II) was pivotal. The optimum pH values for the adsorption of Zn(II) by both samples was 7. The adsorption kinetics and equilibrium isotherm obeyed Elovich and Freundlich models respectively while the evaluated Langmuir qmax were 71.47 and 67.12 mg g–1 for RHAC1 and RHAC2 respectively. The thermodynamic parameters revealed that the process was endothermic and spontaneous at all evaluated temperatures. Therefore, bitter leaf aqueous extract, as an activating agent for carbon production, could serve as a better or close substitute for the less environment-friendly H2SO4.


adsorption; green synthesis; rice husk; bitter leaf; activated carbon

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[1] Osasona, I., Ajayi, O.O., and Adebayo, A.O., 2013, Equilibrium, kinetics, and thermodynamics of the biosorption of Zn(II) from aqueous solution using powdered cow hooves, Int. Sch. Res. Notices, 2013, 865219.

[2] Lakherwal, D., 2014, Adsorption of heavy metals: A review, Int. J. Environ. Res. Dev., 4 (1), 41–48.

[3] Ajjabi, L.C., and Chouba, L., 2009, Biosorption of Cu2+ and Zn2+ from aqueous solutions by dried marine green macroalga Chaetomorpha linum, J. Environ. Manage., 90 (11), 3485–3489.

[4] Engelking, L.R., 2015, “Zinc” in Textbook of Veterinary Physiological Chemistry, 3rd Ed., Academic Press, Boston, US, 309–313.

[5] Volesky, B., and Holan, Z.R., 1995, Biosorption of heavy metals, Biotechnol. Progr., 11 (3), 235–250.

[6] Plum, L.M., Rink, L., and Haase, H., 2010, Essential toxin: Impact of zinc on human health, Int. J. Environ. Res Public Health, 7 (4), 1342–1365.

[7] Nomanbhay, S.M., and Palanisamy, K., 2005, Removal of heavy metal from industrial wastewater using chitosan coated oil palm shell charcoal, Electron. J. Biotechnol., 8 (1), 43–53.

[8] Monser, L., and Adhoum, N., 2002, Modified activated carbon for the removal of copper, zinc, chromium, and cyanide from wastewater, Sep. Purif. Technol., 26 (2-3), 137–146.

[9] Shim, J.W., Park, S.J., and Ryu, S.K., 2001, Effect of modification with HNO3 and NaOH on metal adsorption by pitch-based activated carbon fibers, Carbon, 39 (11), 1635–1642.

[10] Ismail, N.E.A., Taha, M.F., and Ramli, A., 2016, Preparation and characterization activated carbon from rice husk and oil palm empty fruit bunches for removal of Zn2+ in aqueous solution, AIC Conf. Proc., 1787, 040019.

[11] Osasona, I., Aiyedatiwa, K., Johnson, J.A., and Faboya O.L., 2018, Activated carbon from spent brewery barley husks for cadmium ion adsorption from aqueous solution, Indones. J. Chem., 18 (1), 145–152.

[12] Li, K., and Wang, X., 2009, Adsorptive removal of Pb(II) by activated carbon prepared from Spartina alterniflora: Equilibrium, kinetics and thermodynamics, Bioresour. Technol., 100 (11), 2810–2815.

[13] Hasar, H., Cuci, Y., Obek, E., and Dilekoglu, M.F., 2003, Removal of zinc(II) by activated carbon prepared from almond husks under different conditions, Adsorpt. Sci. Technol., 21 (9), 799–808.

[14] Kobya, M., Demirbas, E., Senturk, E., and Ince, M., 2005, Adsorption of heavy metal ions from aqueous solutions by activated carbon prepared from apricot stone, Bioresour. Technol., 96 (13), 1518–1521.

[15] Amuda, O.S., Giwa, A.A., and Bello, I.A., 2007, Removal of heavy metal from industrial wastewater using modified activated coconut shell carbon, Biochem. Eng. J., 36 (2), 174–181.

[16] Alkherraz, A.M., Ali, A.K., and Elsherif, K.M., 2020, Equilibrium and thermodynamic studies of Pb(II), Zn(II), Cu(II) and Cd(II) adsorption onto mesembryanthemum activated carbon, J. Med. Chem. Sci., 3, 1–10.

[17] Sharaf El-Deen, G.E, 2015, Sorption of Cu(II), Zn(II) and Ni(II) from aqueous solution using activated carbon prepared from olive stone waste, Adv. Environ. Technol., 3, 147–161.

[18] Ademiluyi, F.T., and Abidde, A., 2016, Batch adsorption kinetics of zinc ions using activated carbon from waste Nigerian bamboo, Int. J. Eng. Appl. Sci., 3 (1), 95–99.

[19] Zhang, X., Hao, Y., Wang, X., and Chen, Z., 2017, Rapid removal of Zinc(II) from aqueous solutions using a mesoporous activated carbon prepared from agricultural waste, Materials, 10 (9), 1002.

[20] Kumar, P.S., Saravanan, A., Kumar, K.A., Yashwanth, R., and Visvesh, S., 2016, Removal of toxic zinc from water/wastewater using eucalyptus seeds activated carbon: non-linear regression analysis, IET Nanobiotechnol., 10 (4), 244–253.

[21] Alkherraz, A.M., Ali, A.K., and Elsherif, K.M., 2020, Removal of Pb(II), Zn(II), Cu(II) and Cd(II) from aqueous solutions by adsorption onto olive branches activated carbon: Equilibrium and thermodynamic studies, Chem. Int., 6 (1), 11–20.

[22] Tuomikoski, S., Kupila, R., Romar, H., Bergna, D., Kangas, T., Runtti, H., and Lassi, U., 2019, Zinc adsorption by activated carbon prepared from lignocellulosic waste biomass, Appl. Sci., 9 (21), 4853.

[23] Adebisi, G.A., Chowdhury, Z.Z., and Alaba, P.A., 2017, Equilibrium, kinetic, and thermodynamic studies of lead ion and zinc ion adsorption from aqueous solution onto activated carbon prepared from palm oil mill effluent, J. Cleaner Prod., 148, 958–968.

[24] Ajala, A.S., and Gana, A., 2015, Analysis of challenges facing rice processing in Nigeria, J. Food Process., 2015, 893673.

[25] James, A., Mamai, E.A., and Bako, T., 2017, Rice waste conversion for economic empowerment in Taraba State, Nigeria: A review, Int. J. Trend Res. Dev., 4 (5), 515–519.

[26] Abass, A., and Ansumali, S., 2010, Global potential of rice husk as a renewable feedstock for ethanol biofuel production, BioEnergy Res., 3 (4), 328–334.

[27] Okoro, E.E., Dosunmu, A., Iyuke, S., and Oriji, B., 2016, Production of silicon ethoxide from Nigerian rice husk, Int. J. Recent Sci. Res., 7 (2), 9032–9036.

[28] Faronmbi, E.O., and Owoeye, O., 2011, Antioxidative and chemopreventive properties of Vernonia amygdalina and Garcinia biflavonoid, Int. J. Environ. Res. Public Health, 8 (6), 2533–2555.

[29] Alara, O.R., Abdurahman, N.H., Mudalip, S.K.A., and Olalere, O.A., 2017, Phytochemical and pharmacological properties of Vernonia amygdalina: A review, JCEIB, 2 (1), 80–96.

[30] Imaga, N.O.A., and Bamigbetan, D.O., 2013, In vivo biochemical assessment of aqueous extracts of Vernonia amygdalina (Bitter leaf), Int. J. Nutr. Metab., 5 (2), 22–27.

[31] Seef, L.B., Lindsay, K.L., Bacon, B.R., Kresina, T.F., and Hoofnagle, J.H., 2001, Complementary and alternative medicine in chronic liver disease, Hepatology, 34 (3), 595–603.

[32] Ekpete, O.A., Horsfall Jr., M., and Tarawou, T., 2011, Sorption kinetic study on the removal of phenol using fluted pumpkin and commercial activated carbon, Int. J. Biol. Chem. Sci., 5 (3), 1143–1152.

[33] Vijayaraghavan, K., and Yun, Y.S., 2008, Bacterial biosorbents and biosorption, Biotechnol. Adv., 26 (3), 266–291.

[34] Elliott, H.A., and Huang, C.P., 1981, Adsorption characteristics of some Cu(II) complexes on aluminosilicates, Water Res., 15 (7), 849–855.

[35] Srivastava, V.C., Swamy, M.M., Mall, I.D., Prasad, B., and Mishra, I.M., 2006, Adsorptive removal of phenol by bagasse fly ash and activated carbon: Equilibrium, kinetics and thermodynamics, Colloids Surf., A, 272 (1-2), 89–104.

[36] Khademi, Z., Ramavandi, B., and Ghaneian, M.T., 2015, The behaviors and characteristics of a mesoporous activated carbon prepared from Tamarix hispida for Zn(II) adsorption from wastewater, J. Environ. Chem. Eng., 3 (3), 2057–2067.

[37] Fischer, A.R., Sgolik, L., Kreller, A., and Dornack, C., 2018, Zinc(II) adsorption by low-carbon shungite: The effect of pH, Water, 10 (4), 422.

[38] Mouni, L., Merabet, D., Bouzaza, K., and Belkhiri, L., 2010, Removal of Pb2+ and Zn2+ from the aqueous solutions by activated carbon prepared from Dates stone, Desalin. Water Treat., 16 (1-3), 66–73.

[39] Yang, C., Girma, A., Lei, T., Liu, Y., and Ma, C., 2016, Study on simultaneous adsorption of Zn(II) and methylene blue on waste-derived activated carbon for efficient applications in wastewater treatment, Cogent Environ. Sci., 2, 1151983.

[40] Sathishkumar, M., Binupriya, A.R., Kavitha D., Selvakumar, R., Choi, J.G., and, Yun, S.E., 2009, Adsorption potential of maize cob carbon for 2,4-dichlorophenol removal from aqueous solutions: Equilibrium, kinetics and thermodynamics modeling, Chem. Eng. J., 147 (2-3), 265–271.

[41] Al-Rashed, S.M., and Al-Gaid A.A., 2012, Kinetic and thermodynamic studies on the adsorption behavior of Rhodamine B dye on Duolite C-20 resin, J. Saudi Chem. Soc., 16 (2), 209–215.

[42] Yu, Y., Zhuang, Y.Y., and Wang, Z.H., 2001, Adsorption of water soluble dye onto functionalized resin, J. Colloid Interface Sci., 242 (2), 288–293.

[43] Malik, A., Khan, A., Anwar, N., and Naeem, M., 2020, Comparative study of the adsorption of Congo Red dye on rice husk, rice husk char and chemically modified rice husk char from aqueous media, Bull. Chem. Soc. Ethiop., 34 (1), 41–54.

[44] Foo, K.Y., and Hameed, B.H., 2010, Insights into the modeling of adsorption isotherm systems, Chem. Eng. J., 156 (1), 2–10.

[45] López-Luna, J., Ramírez-Montes, L.E., Martinez‑Vargas, S., Martínez, A.I., Mijangos‑Ricardez, O.F., González-Chávez, M.C.A., Carrillo-González, R., Solís-Domínguez, F.A., Cuevas-Díaz, M.C., and Vázquez-Hipólito, V., 2019, Linear and nonlinear kinetic and isotherm adsorption models for arsenic removal by manganese ferrite nanoparticles, SN Appl. Sci., 1 (8), 950.

[46] Mahmoud, D.K., Mohd Salleh, M.A., and Wan Abdul Karim, W.A., 2012, Langmuir model application on solid liquid adsorption using agricultural wastes: Environmental application review, J. Purity Util. React. Environ., 1 (4), 170–199.

[47] Tran, H.N., You, S.J., Hosseini-Bandegharaei, A., and Chao, H.P., 2017, Mistakes and inconsistencies regarding adsorption of contaminants from aqueous solutions: A critical review, Water Res., 120, 88–116.

[48] Cheung, C.W., Porter, J.F., and McKay, G., 2000, Sorption kinetics for the removal of copper and zinc from effluents using bone char, Sep. Purif. Technol., 19 (1-2), 55–64.

[49] Osasona, I., Adebayo, A.O., and Okoronkwo, A.E., 2017, Characterization and utilization of citric acid modified cow hoof for adsorption of cadmium and copper from wastewater, Chem. Sci. Int. J., 21 (1), 32537.

[50] Wu, F.C., Tseng, R.L., and Juang, R.S., 2009, Characteristics of Elovich equation used for the analysis of adsorption kinetics in dye–chitosan systems, Chem. Eng. J., 150 (2-3), 366–373.

[51] Aldawsari, A., Khan, M.A., Hameed, B.H., Alqadami, A.A., Siddiqui, M.R., Alothman, Z.A., and Hadj Ahmed, A.Y.B., 2017, Mercerized mesoporous date pit activated carbon- A novel adsorbent to sequester potentially toxic divalent heavy metals from water, PLoS ONE, 12 (9), e0184493.


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