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Fumihiko Ogata,Ayaka Ueda,Shigeharu Tanei,Daisuke Imai,Naohito Kawasaki 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.35 No.-
We investigated the simultaneous removal of phosphate and nitrite ions from aqueous solutions by acombination treatment that used both PG-Ca (poly-g-glutamic acid combined with flocculating agents)and SB600 (soybeans treated with calcium chloride, hydrochloric acid and calcined at 600 8C). Phosphateions and nitrite ions were selectivity adsorbed by PG-Ca and SB600, respectively. The removalmechanism of phosphate ions from aqueous solution was related to the presence of calcium hydroxide(derived from PG-Ca), and that of nitrite ions was related to the presence of chloride ions at the surface ofSB600.
Fumihiko Ogata,Erimi Ueta,Naohito Kawasaki 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.59 No.-
In the present study, we prepared a newly adsorbent, Iron–Magnesium-type hydrotalcite (FHT), at different molar ratios (FHT3.0; Mg2+/Fe3+ = 3.0 and FHT5.0; Mg2+/Fe3+ = 5.0) for removing heavy metal ions. Characteristics of FHT and arsenite (As(III)) and hexavalent chromium (Cr(VI)) adsorption capability onto that were evaluated. Amount adsorbed of As(III) and Cr(VI) increased with raising temperatures. Amount adsorbed of heavy metal ions onto FHT in the single liquid phase was smaller than that in the mixed liquid phase, which suggests that the amount adsorbed was affected by the adsorbent properties, interlayer space, and solution pH.
Fumihiko Ogata,Daisuke Imai,Megumu Toda,Masashi Otani,Naohito Kawasaki 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.34 No.-
Nickel hydroxide (Ni) was calcined at 270 and 400 8C (denoted Ni270 and Ni400), and the properties ofNi, 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 anadsorption isotherm, and study of desorption. The amounts of phosphate ion adsorbed by the differentsamples showed the order Ni < Ni400 < Ni270. Finally, phosphate ions adsorbed onto Ni270 could bedesorbed using sodium hydroxide, indicating that Ni270 can be used as a renewable adsorbent.