Publications by authors named "Kohji Sakane"
Synthesis and phosphate uptake behavior of Zr4+ incorporated MgAl-layered double hydroxides.
J Colloid Interface Sci
September 2007
Article Synopsis
- Synthesized Zr(4+) incorporated MgAl-layered double hydroxides (Mg(AlZr)-LDH) with varying Mg/(Al+Zr) molar ratios to explore their phosphate ion uptake behavior.
- CO(3)-type LDH materials exhibited low crystallinity at room temperature, while Cl-type LDH with high crystallinity was successfully created using hydrothermal treatment.
- The CO(3)-type LDH showed significantly higher phosphate ion uptake compared to Cl-type materials, achieving maximum take-ups of 30 mg-P/g in wastewater and 16 mg-P/g in seawater, attributed to complex formation with Zr(IV) centers.
Ce(IV)-loaded Y-zeolites (CeY) were prepared for selective removal of the trace amount of organic sulfur compounds from hydrodesulfurization (HDS)-treated diesel oil. The CeY samples can be obtained from NH4-Y-zeolite (NH4Y) using liquid-phase ion-exchange and solid-state ion-exchange methods. The ion-exchange reactions, structures, and selective adsorptions of organic sulfur compounds of the CeY samples were investigated using XRD, IR, XPS, TEM, and GC sulfur analyzer.
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- Low crystalline iron hydroxides, goethite and akaganeite, were synthesized to selectively adsorb phosphate ions from phosphate-rich seawater.
- Goethite and akaganeite exhibited different selectivity patterns for oxoanions, with both showing a strong preference for phosphate even in the complex seawater environment.
- The maximum phosphate uptake was determined to be 10 mg P/g at a concentration of 0.3 mg P/L, and akaganeite demonstrated excellent stability across multiple adsorption/desorption cycles.
Phosphate adsorption from single electrolyte (NaH2PO4), phosphate-enriched seawater, and model wastewater was studied using amorphous zirconium hydroxide, ZrO(OH)2(Na2O)0.05 1.5H2O, as an adsorbent.
View Article and Find Full Text PDFAdsorption of phosphate from seawater on calcined MgMn-layered double hydroxides.
J Colloid Interface Sci
October 2005
Adsorptive properties of MgMn-3-300 (MgMn-type layered double hydroxide with Mg/Mn mole ratio of 3, calcined at 300 degrees C) for phosphate were investigated in phosphate-enriched seawater with a concentration of 0.30 mg-P/dm3. It showed the highest phosphate uptake from the seawater among the inorganic adsorbents studied (hydrotalcite, calcined hydrotalcite, activated magnesia, hydrous aluminum oxide, manganese oxide (delta-MnO2)).
View Article and Find Full Text PDFAdsorption of the organic sulfur compounds thiophene (TP) and 1-benzothiophene (1-BTP) in an organic model solution of hydrodesulfurizated gasoline (heptane with 1 wt% toluene and 0.156 mM (5 ppmw as sulfur) TP or 1-BTP) was studied by a batch method at 80 degrees C using metal-ion-exchanged Y-zeolites. Although NaY-zeolite or its acid-treated material rarely adsorbed the organic sulfur compounds, NaY-zeolites exchanged with Ag+, Cu2+, and Ce3+ ions and NH(4)Y-zeolites exchanged with Ce3+ ions showed markedly high adsorptive capacities for TP and 1-BTP.
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