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Articles by Teruo Henmi
Total Records ( 4 ) for Teruo Henmi
  Hamayoon Khan , Amir Zaman Khan , Rozina Khan , Naoto Matsue and Teruo Henmi
  The objective of this study was to quantify the effects of Zeolite and Allophane on vegetative phenology of determinate and inderminate soybean. One determinate (Enrei, [MG] 1V) and indeterminate cultivar (Harosoy [MG] 11) were planted in pots on April 20th at the Faculty of Agriculture, Ehime University, Matsuyama Japan during 2007. Zeolite levels of 0, 20 and 40 g were used to determine the growth behavior of soybean cultivars grown on KyP and KnP of allophanic soil. Zeolite and allophanic soil application significantly affected vegetative phenological parameters of soybean cultivars. Minimum number of days to emergence, unifoliate first and second and 6th trifoliate leaf formation were taken by 20 and 40 g Zeolite application in both cultivars. KyP and KnP of allophanic soil took minimum days to all vegetative phonological parameters. Enrei cultivar took minimum days to emergence and in all respective vegetative developmental periods than Harosoy. Zeolite treated plots attained more plant height than control plots. Both KyP and KnP of allophanic soil gave maximum plant height as compared to paddy soil. Harosoy produced the tallest plants than Enrei. Present findings support the results of experiments by demonstrating that Zeolite application at planting time encourages the initiation of vegetative phenology of soybean cultivars grown on KyP and KnP of allophanic Soil.
  Adel Ghoneim , Naoto Matsue and Teruo Henmi
  Mechanisms of change in charge characteristics after copper adsorption on one low Si/Al (KyP) and one high Si/Al (KnP) nano-ball allophane samples were investigated. The CEC values of the two nano-ball allophane samples tended to decrease while AEC increased after copper species adsorption at the initial concentration of 1.60 mM. The change in charge characteristics of the allophane samples was governed by the pH, Cu2+, CuOH+ in the solution and amounts of adsorption. The decline in the CEC values after adsorption was due to the neutralization reactions between the monomeric Cu2+ with Si-O- or Al-O- functional groups. Molecular orbital calculations indicated that Cu2+ and CuOH+ could adsorb not only on the dissociated Si-O- but also with the undissociated Si-OH groups. When copper ion reacted with undissociated Si-OH groups, dissociation reaction of silanol groups accelerated. The Cu2+ ion has a possibility to accelerate the deprotonation of undissociated Si-OH groups near the adsorption sites. The decrease in change CEC values was found to be higher in case of a higher Si/Al ratio (KnP) than that for the lower Si/Al ratio (KyP) counterpart, due to it`s a higher adsorptive capacity for copper species. The slight increase in the AEC values after zinc adsorption was probably due to in part to the initial H+ ions released into the bulk solution.
  Adel Ghoneim , Naoto Matsue , Azza Ebid and Teruo Henmi
  Effect of Zn adsorption on the change in charge characteristics of two nano-ball allophane samples with different Si/Al ratio at various pH values was studied. The Cation Exchange Capacity (CEC) values of the two nano-ball allophane samples were likely to decrease whereas Anion Exchange Capacity (AEC) increased after Zn adsorption at initial concentration of 0.18 mM. The change in charge characteristics of the allophane samples was controlled by equilibrium pH, amounts of Zn adsorption and Zn species in the solution. The decrease in CEC values after Zn adsorption was due to neutralization reactions between cationic Zn with Si–O¯ functional groups. The decrease in CEC values was found to be higher in case of allophane sample with higher Si/Al ratio (KnP) than that with lower Si/Al ratio counterpart (KyP), due to its higher adsorptive capacity for Zn species. The slight increase in the AEC values after Zn adsorption was probably due to in part to the initial H+ ions released into the bulk solution. Molecular orbital calculation indicated that the adsorbed Zn species has a ability to accelerate the deprotonation of undissociated Si–OH groups near the adsorption sites by an inductive effect.
  Adel Ghoneim , Naoto Matsue , Azza Ebid and Teruo Henmi
  Effect of zinc adsorption on the change in surface acidity of two nano-ball allophane samples with varying Si/Al ratio was studied. Zinc adsorption caused the enhancement in the surface acidity of nano-ball allophane samples. The enhancement in the surface acidity after zinc species adsorption is attributed to the inductive effect on the Si–OH groups near the adsorption sites. Molecular orbital calculations indicated that Zn2+ ion has the possibility to accelerate deprotonation of the Si–OH functional groups near the adsorption site. The result showed that the surface acidity of the allophane sample with a higher Si/Al ratio (KnP) was stronger than the KyP sample with lower Si/Al ratio. This tendency was observed under RH between 0 and 76%; then, the acid strength for the two nano-ball samples was the same at RH of 100%. The stronger acidity of the KnP sample is attributed to its a higher number of accessory polymeric silanol groups attached to the main frame structure, which cause the enhancement of the Brønsted acidity. The higher increase in the acid strength of the KnP could be also attributed to its higher adsorptive capacity for zinc species.
 
 
 
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