Mineaki Kabayama

Bio: Mineaki Kabayama is an academic researcher. The author has contributed to research in topics: Adsorption & Phosphate. The author has an hindex of 6, co-authored 16 publications receiving 541 citations.

Relationship between Anion Adsorption and Physicochemical Properties of Aluminum Oxide

Abstract: This study investigated the adsorption capacity and adsorption mechanism of phosphate by calcined aluminum oxide (GB) at temperatures of 200 to 1150 ◦ C. The results showed that GB and GB calcined at a temperature of 200 ◦ Ce xhibited almost no adsorption capacity, and GB calcined at temperatures of 300 or 400 ◦ Ce xhibited the highest adsorption capacity. After that, adsorption capacity tended to decrease with increasing calcination temperature. The specific surface area and the concentration of surface hydroxyl groups exhibited the highest values in GB calcined at temperatures of 300 and 400 ◦ C. From the above facts, it is conjectured that the specific surface area and concentration of surface hydroxyl groups contribute to the adsorption of phosphate in calcined GB. The results of X-ray diffraction showed that the structure of GB changed drastically at temperatures of 200 to 300 ◦ C and 900 to 1000 ◦ C. Also ,i tw as evident that phosphate was adsorbed selectively even in complex solution systems containing chloride, nitrate, sulfate, hydrogen carbonate and phosphate ions, and that calcined GB is suitable for adsorption of phosphate. For the adsorption of phosphate, it was found that the optimum pH is around 4. When calcined GB is suspended in purified water, it is thought that hydroxyl groups form through dissociative adsorption with wate rm olecules, and that these hydroxyl groups conduct ion exchange with phosphate.

Characteristics of Phosphate Ion Adsorption-Desorption onto Aluminum Oxide Hydroxide for Preventing Eutrophication

Abstract: Human and industrial activities have recently lead to problems in regard to the eutrofication of isolated bodies of water due to influx of phosphate ions from industrial and domestic wastewater. Various methods have been developed for the removal of phosphate ions. And in particular, adsorption allows efficient and inexpensive recovery of phosphate ions in which the adsorbant and adsorbate are regenerable. In this study, investigations were carried out regarding the production of aluminum oxide hydroxide and granular aluminum oxide hydroxide, the adsorption and desorption capacities of these substances with respect to phosphate ion, and desorption efficiency and phosphate ion recovery levels obtained using sodium hydroxide and sodium carbonate. Adsorption and desorption were repeated 50 times in order to evaluate the effectiveness of aluminum oxide hydroxide, and it was determined that the adsorption performance of aluminum oxide hydroxide and granular aluminum oxide hydroxide with respect to phosphate ions is highly relative to aluminum oxide. The quantity of phosphate ions adsorbed was seen to decrease with repeated use of aluminum oxide hydroxide. The adsorption mechanism for phosphate ions onto aluminum oxide is conjectured as involving the presence of active hydroxyl groups contributing to ion exchange at the surface of the aluminum oxide hydroxide, ion exchange with phosphate ions, and the chemical bonding of hydroxyl groups with phosphate ions. It was thus clarified that aluminum oxide hydroxide is suitable for use as an adsorbant for the recovery of phosphate ions. Moreover, the investigations suggested that this material would be useful for preserving phosphate ion resources by recovering phosphate, a cause of eutrophication, as a value-added sodium phosphate product.

Sorption of pollutants by porous carbon, carbon nanotubes and fullerene- An overview

Abstract: The quality of water is continuously deteriorating due to its increasing toxic threat to humans and the environment. It is imperative to perform treatment of wastewater in order to remove pollutants and to get good quality water. Carbon materials like porous carbon, carbon nanotubes and fullerene have been extensively used for advanced treatment of wastewaters. In recent years, carbon nanomaterials have become promising adsorbents for water treatment. This review attempts to compile relevant knowledge about the adsorption activities of porous carbon, carbon nanotubes and fullerene related to various organic and inorganic pollutants from aqueous solutions. A detailed description of the preparation and treatment methods of porous carbon, carbon nanotubes and fullerene along with relevant applications and regeneration is also included.

Sustainable management of coffee industry by-products and value addition—A review

Abstract: Coffee is one of the popular beverages of the world and second largest traded commodity after petroleum. Coffee is cultivated in about 80 countries across the globe and entangles huge business worldwide. Coffee dispensation requires an elevated degree of processing know how and produces large amounts of processing by-products such as coffee pulp and husk, which have limited applications such as fertilizer, livestock feed, compost and such others. Biotechnological applications in the field of industrial residues management promote sustainable development of country's economy. The objectives pertaining to food processing by-products, waste and effluents include the recovery of fine chemicals and production of precious metabolites via chemical and biotechnological processes. Pre-treatments, followed by recovery procedures endow value-added products (natural antioxidants, vitamins, enzymes, cellulose, starch, lipids, proteins, pigments) of high significance to the pharmaceutical, cosmetic and food industries. With the background of high crop production in the upcoming years, there is an imperative need to counterpart this production with some utilization and industrial application of coffee by-products since coffee industry emerges enormous amounts of coffee by-products which are thriving nutrient resources. The present review highlights explorations of value addition to coffee by-products which can be achieved with valorization strategy, integration of techniques and applications of bioengineering principles in food processing and waste management and secondly conserve environment with disposal problem accelerating both ecological and economical resources.