Kansai Catalyst Co.

Sakai, Japan

Kansai Catalyst Co.

Sakai, Japan

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Ogata F.,Kinki University | Imai D.,Kinki University | Toda M.,Kansai Catalyst Co. | Otani M.,Kansai Catalyst Co. | Kawasaki N.,Kinki University
Journal of Industrial and Engineering Chemistry | Year: 2016

Nickel hydroxide (Ni) was calcined at 270 and 400 °C (denoted Ni270 and Ni400), and the properties of Ni, Ni270, and Ni400 were investigated. In addition, the phosphate adsorption capabilities of Ni, Ni270, and Ni400 were evaluated by examination of the effects of contact time and solution pH, analysis of an adsorption isotherm, and study of desorption. The amounts of phosphate ion adsorbed by the different samples showed the order Ni < Ni400 < Ni270. Finally, phosphate ions adsorbed onto Ni270 could be desorbed using sodium hydroxide, indicating that Ni270 can be used as a renewable adsorbent. © 2015 The Korean Society of Industrial and Engineering Chemistry.


Ogata F.,Kinki University | Imai D.,Kinki University | Toda M.,Kansai Catalyst Co. | Otani M.,Kansai Catalyst Co. | Kawasaki N.,Kinki University
e-Journal of Surface Science and Nanotechnology | Year: 2014

Nickel hydroxide (Ni100) and nickel hydroxide, including cobalt (NiCo91), were calcined at different temperatures. These materials were investigated by analyzing data obtained from X-ray diffraction (XRD), scanning electron microscopy, specific surface area, thermogravimetric-differential thermal (TG-DTA) technique, and electron-probe microanalysis. The XRD and TG-DTA data obtained indicated that calcination at 250-270°C can promote the conversion of Ni(OH)2 into NiO, and that cobalt hardly affected the structural changes of nickel hydroxide. The specific surface areas of Ni100 and NiCo91 were determined to be in the range 17.9-148.3 and 21.0-145.1 m2/g, respectively. The specific surface area increased suddenly at 260°C. The amount of phosphate adsorbed onto Ni100 and NiCo91 was measured to be in the range 29.2-44.7 and 29.7-54.0 mg/g, respectively. The amount adsorbed onto Ni100 or NiCo91 was greater than that onto another adsorbent previously reported. The correlation coefficient relationships between the specific surface areas of Ni100 and NiCo91 and the saturated amount of the adsorbed phosphate ions were found to be 0.935 and 0.960, respectively. These results suggested that adsorption of phosphate ions with Ni100 or NiCo91 is related to the specific surface area. Our study demonstrated that Ni100 and NiCo91 can be considered as promising materials for the adsorption of phosphate ions from aqueous solutions. © 2014 The Surface Science Society of Japan.


Ogata F.,Kinki University | Imai D.,Kinki University | Toda M.,Kansai Catalyst Co. | Otani M.,Kansai Catalyst Co. | Kawasaki N.,Kinki University
Journal of Environmental Chemical Engineering | Year: 2015

In this study, cobalt hydroxide (Co) was calcined at 130 and 150 °C (Co130 and Co150) and the physical properties of Co, Co130 and Co150 were investigated. Co, Co130, and Co150 were characterized by scanning electron microscopy, X-ray diffraction analysis, and thermogravimetric-differential thermal analysis, and the specific surface area, amount of hydroxyl groups, and surface pH were determined. Moreover, the phosphate adsorption capability of cobalt hydroxide and the cobalt hydroxide calcination products was evaluated via examination of the effect of contact time and solution pH, analysis of an adsorption isotherm, and a desorption study. The amount of hydroxyl groups on the adsorbent decreased in order Co (0.62 mmol/g) > Co130 (0.39 mmol/g) > Co150 (0.06 mmol/g). Similarly, the amount of phosphate ion adsorbed decreased in order Co (155.0 mg/g) > Co130 (120.0 mg/g) > Co150 (2.5 mg/g). These results indicated a linear correlation between the amount of phosphate ions adsorbed and the amount of hydroxyl groups on the adsorbent (correlation coefficient: 0.980). Adsorption kinetic data fit the pseudo-second-order kinetic model better than the pseudo-first-order model, and results from the adsorption isotherm studies suggested that phosphate ion adsorption can be well described by both the Freundlich and Langmuir equations. The ideal pH for phosphate ion adsorption was approximately in the range 6.0-9.0, and the mechanism for phosphate ion adsorption involved ion exchange with surface hydroxyl groups onto the adsorbent. Finally, the desorption results indicated that Co has promising potential for use as a renewable adsorbent. © 2015 Elsevier B.V. All rights reserved.


PubMed | Kinki University and Kansai Catalyst Co.
Type: Journal Article | Journal: Water science and technology : a journal of the International Association on Water Pollution Research | Year: 2017

Different molar ratios of a Ni/Co binary hydroxide (NiCo82, NiCo91, and Ni100) were prepared and calcined at 270 C (NiCo82-270, NiCo91-270, and Ni100-270). The properties of the adsorbents and the amount of adsorbed phosphate ions were evaluated. The adsorbents calcined at 270 C had a nickel oxide structure. The amount of adsorbed phosphate ions, the amount of hydroxyl groups, and the specific surface area of the calcined adsorbents at 270 C were greater than those of the uncalcined adsorbents. The amount of adsorbed phosphate ions was related to the amount of hydroxyl groups and the specific surface area; the correlation coefficients were 0.966 and 0.953, respectively. The adsorption isotherm data for NiCo91 and NiCo91-270 were fit to both the Freundlich and Langmuir equations. The amount of adsorbed phosphate ions increased with increasing temperature. The experimental data fit the pseudo-second-order model better than the pseudo-first-order model. A neutral pH was optimal for phosphate ion adsorption. In addition, the phosphate ions that were adsorbed onto NiCo91-270 could be recovered using sodium hydroxide, and the adsorbent was useful for the repetitive adsorption/desorption of phosphate ions. Collectively, these results suggest that NiCo91-270 is prospectively useful for the adsorption of phosphate ions from aqueous solutions.

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