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Methylene Blue Removal from Aqueous Solution by Adsorption on Archidendron jiringa Seed Shells

Journal of Geoscience and Environment Protection 2020年第2期8卷 128-143页

作者： sarah nadira hurairah Nurulhuda Md Lajis Azhar Abdul Halim Department of Environmental Science & Natural Resources Faculty of Science and Technology Universiti Kebangsaan Malaysia Bangi Selangor Malaysia

A study of batch and column adsorption using A. jiringa seed shell as a natural adsorbent to remove methylene blue from aqueous solution was carried out. This study aimed to determine the effectiveness of A. jiringa seed shell in removing methylene blue as well as to determine the isotherm and adsorption kinetics of methylene blue by A. jiringa seed shells. Parameters in the batch study showed optimum pH for adsorption was at pH 7 with the optimum contact time of 60 minutes whereas the adsorbent dose obtained was 12 g/l. The percentage removal of methylene blue increased with elevated temperature while the ionic strength reduced the adsorption capacity in the dye uptake. Langmuir isotherm was suitable for this study rather than Freundlich model due to the higher regression value: R2 = 0.9999. The most suitable kinetic model for this study was the pseudo second order, compared to pseudo first order, Elovich and intra particle with the value of regression: R2 = 0.9158. This column adsorption study used several different flow rates: 15 mL/min, 18 mL/min, 21 mL/min, 24 mL/min and 27 mL/min for 75 minutes long. The breakthrough time was lesser: 10 minutes in higher flow rates (24 mL/min and 27 mL/min), which indicated the shorter time for the adsorbent to be saturated. Thomas and Yoon & Nelson’s models were proven to be more suitable compared to Bohart-Adams model for the fixed bed adsorption study.

关键词： A. jiringa Seed Shells Adsorption Isotherm Kinetic Model Methylene Blue

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Removal of Hexavalent Chromium from Aqueous Solution by Adsorption on Palm Oil Fuel Ash (POFA)

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Journal of Geoscience and Environment Protection 2020年第2期8卷 112-127页

作者： Nurulhana Nordin Nur Amirah Ahmad Asmadi Mohan Kumar Manikam Azhar Abdul Halim Marlia Mohd Hanafiah sarah nadira hurairah Center for Earth Sciences and Environment Faculty of Science and Technology Universiti Kebangsaan Malaysia Bangi Selangor Malaysia Centre for Tropical Climate Change System Institute of Climate Change Universiti Kebangsaan Malaysia Bangi Selangor Malaysia

This study investigated the removal of hexavalent chromium, Cr(VI) from aqueous solution by adsorption using palm oil fuel ash (POFA), an agricultural waste from the palm oil industry. POFA adsorbent was characterized by X-ray diffraction (XRD) analysis. Batch adsorption study revealed that the optimum conditions for the removal were as follows: pH 2, adsorbent dosage 80 g/L and contact time of 6 min, which resulted in 92% removal and 0.464 mg/g maximum adsorption capacity. Adsorption isotherm and kinetic studies showed that Freundlich isotherm and pseudo-second-order kinetic models fitted best to the experimental data. Column adsorption study at 5 mL/min of flow rate showed that 90% removal was obtained at 2 min of contact time which represented its breakthrough point. The column reached saturation at 30 min and the maximum column adsorption capacity recorded was 0.412 mg/g. The column adsorption behavior showed good fit with both Thomas and Yoon-Nelson kinetic models. These findings suggested that the utilization of POFA as a low-cost adsorbent to remove Cr(VI) from wastewater, either in batch or fixed bed adsorption system is not only effective, but concurrently will help to reduce wastes from the palm oil industry.

关键词： Hexavalent Chromium Palm Oil Fuel Ash (POFA) Low Cost Adsorbent Adsorption Isotherms Adsorption Kinetics

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