Regeneration and reuse of spent NaOH-treated oil palm frond for copper and zinc removal from wastewater |
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| Authors: | Babak Salamatinia Azlina Harun Kamaruddin Ahmad Zuhairi Abdullah |
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| Affiliation: | 1. Faculty of Chemical Engineering, Department of Engineering, Tarbiat Modares University, Tehran, Iran;2. Chemical Engineering Department, Engineering Faculty, University of Guilan, Rasht, Iran;1. State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China;2. Department of Catalysis Science and Engineering, School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin 150001, China;1. Institut Charles Gerhardt Montpellier, UMR 5253 CNRS-UM2-ENSCM-UM1 Agrégats, Interfaces et Matériaux pour l’Energie, CC 1502, Place Eugène Bataillon, 34095 Montpellier Cedex 5, France;2. CEA Marcoule, Nuclear Energy Division, RadioChemistry & Processes Department, Service of Separation Processes, Laboratory of Interactions Ligand-Actinide, F-30207 Bagnols-sur-Cèze, France;1. King Abdullah Institute for Nanotechnology, King Saud University, Riyadh 11451, Saudi Arabia;2. Central Metallurgical Research and Development Institute, CMRDI, Helwan 11421, Cairo, Egypt;3. Advanced Materials Research Chair, Department of Chemistry, College of Science, King Saud University, Riyadh 11451, Saudi Arabia;4. Kayyali Chair for Pharmaceutical Industries, Department of Pharmaceutics, Faculty of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia;5. Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Al-Azhar University, 71111 Assiut, Egypt;1. Departamento de Física e Química, Unesp – Univ Estadual Paulista, Av. Brasil, 56-Centro, Caixa Postal 31, 15385-000 Ilha Solteira, São Paulo, Brazil;2. Instituto de Química, Universidade de Campinas, Unicamp, 13084-971 Campinas, São Paulo, Brazil;3. Departamento de Engenharia Mecânica, Unesp – Univ Estadual Paulista, Av. Brasil, 56-Centro, Caixa Postal 31, 15385-000 Ilha Solteira, São Paulo, Brazil;1. Department of Chemical and Biomolecular Engineering, BK21 Plus Program, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea;2. Institute for the BioCentury, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea |
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| Abstract: | The use of NaOH-treated oil palm frond (OPF) sorbent for Cu and Zn removal and its subsequent regeneration process are reported. The regeneration of the spent sorbent was achieved by desorbing the metals in 0.1 M of sodium hydroxide (NaOH), ethylene diamine tetraacetic acid (EDTA), hydrochloric acid (HCl) and nitric acid (HNO3) solutions. The reusability study of the sorbent was conducted using 100 mg/l of Cu and Zn at a pH of 4.5 and 5.5, respectively for 1 h. The results were to be correlated with the mechanism of the metal uptake. Freundlich isotherm fitted the data to indicate the presence of heterogeneous metal sorption sites. Zn showed better regeneration efficiency of up to 88% and HCl was the best regeneration agent. The results confirmed that ion exchange was the main mechanism for the metal uptake. The desorption efficiency dropped by merely about 20% while the sorption capacity experienced a drastic drop after reuse for the fourth cycle. The damage occurred on the heavy metal binding sites by the strong acid was responsible for this drop. |
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