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Tomohito Kameda,Tetsu Shinmyou,Toshiaki Yoshioka 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.36 No.-
1-Hydroxyethane-1,1-diphosphonic acid intercalated Li–Al layered double hydroxide (HEDP Li–Al LDH)was prepared by co-precipitation. HEDP Li–Al LDH was found to take up Nd3+ and Sr2+ ions from aqueoussolutions; this can be attributed to the metal-chelating functions of the HEDP ions in the interlayers ofHEDP Li–Al LDH. Sr2+ uptake by HEDP Li–Al LDH was larger than Nd3+ uptake. This is probably becausethe uptake of one mole of Nd3+ by HEDP Li–Al LDH requires two times the number of moles of HEDP ionsthan the uptake of one mole of Sr2+. The mass-transfer-controlled shrinking core model described theuptake behavior better than the surface reaction-control model. HEDP ions in the HEDP Li–Al LDHinterlayer rapidly form chelate complexes with Nd3+ or Sr2+, as a result of which the transfer of Nd3+ orSr2+ through the product layer is rate limiting. Furthermore, this reaction mechanism can be described bya Langmuir-type adsorption phenomenon, indicating that this reaction involves chemical adsorption;this is consistent with the formation of chelate complexes between Nd3+ or Sr2+ and HEDP ions in theinterlayers of HEDP Li–Al LDH. The control of chelate ions in the interlayer of Li–Al LDH leads to thecontrol of the preferential uptake of metal ions.
Tomohito Kameda,Yoshiaki Umetsu 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.53 No.-
Carbonate ion-intercalated Mg–Al layered double hydroxides (CO3-type Mg–Al LDHs) were prepared by using various methods to mix a solution of Mg(NO3)2 and Al(NO3)3 with an alkaline solution, and the particle properties of the obtained samples were compared. By mixing stoichiometric quantities of Mg2+, Al3+, and OH according to the coprecipitation reaction for preparing CO3-type Mg–Al LDHs, Mg2+ and Al3+ in solution were quantitatively precipitated, and the Mg/Al molar ratios of the obtained Mg–Al LDHs were equal to those of the solution, irrespective of the preparation method. However, the different preparation methods resulted in different particle properties, namely, different particle size distributions, particle morphologies, and sedimentation properties were observed. These differences were attributed to different formation processes for Mg–Al LDH. The ideal preparation method was determined to involve the addition of Mg(NO3)2 and Al(NO3)3 solution to Na2CO3 solution at a constant pH, which was achieved by adjusting with NaOH solution. This preparation method resulted in the formation of CO3-type Mg–Al LDH particles with uniform primary particles, good sedimentation properties, and a narrow distribution of secondary particle aggregates. Such characteristics make these Mg–Al LDHs excellent candidates for wastewater treatment.
Treatment of hydrochloric acid using Mg–Al layered double hydroxide intercalated with carbonate
Tomohito Kameda,Masahito Tochinai,Toshiaki Yoshioka 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.39 No.-
Mg–Al layered double hydroxide intercalated with CO32 (CO3 Mg–Al LDH) was found to take up onlylow amounts of Cl during the treatment of hydrochloric acid. Low pH promotes the removal of Cl . HClis considered to react with CO32 in the interlayers of Mg–Al LDH as a result of which Cl is probablyintercalated in the interlayers. High pH of the Mg–Al LDH suspension leads to a lower extent of reactionbetween HCl and Mg–Al LDH, owing to the neutralization of the acid. We can state that the adsorption ofCl on Mg–Al LDH is best described by the Dubinin–Radushkevich adsorption isotherm. The maximumadsorption amounts were calculated to be 1.4 and 0.6 mmol/g for CO3 Mg–Al LDH with Mg/Al molarratios of 2 and 4, respectively, whereas the adsorption energies were calculated to be 82 and 124 kJ/mol,respectively. In summary, the removal of Cl is caused by both the reaction between hydrochloric acidand CO32 in the interlayers of Mg–Al LDH as well as anion exchange between the HCO3produced and adifferent Cl ion in hydrochloric acid. This explains why the adsorption is best expressed by the D–Radsorption isotherm, which assumes a heterogeneous surface and non-constant adsorption potential
Adsorption of Methylene Blue from Aqueous Solution on Analcime Synthesized from Diatomite
( Zhang Yi ),( Jing Zhenzi ),( Tomohito Kameda ),( Toshiaki Yoshioka ) 한국폐기물자원순환학회(구 한국폐기물학회) 2015 한국폐기물자원순환학회 3RINCs초록집 Vol.2015 No.-
The adsorption of methylene blue from aqueous solution was studied by using hydrothermally synthesized analcime from diatomite at different temperatures. The linear Langmuir, Freundlich adsorption models were carried out to describe the equilibrium isotherms. In addition to that, the pseudo-first order and pseudo-second order were used to determine the kinetic data and the thermodynamic parameters were also calculated. These values showed that the adsorption of MB on analcime sample endothermic and was occurred spontaneously.
( Shogo Kumagai ),( Harendra Kumar ),( Tomohito Kameda ),( Yuko Saito ),( Toshiaki Yoshioka ) 한국폐기물자원순환학회 2022 ISSE 초록집 Vol.2022 No.-
The wire harness assembly, used to conduct electricity to vehicle components and electrical and electronic appliances, is abundantly present in waste electrical and electronic equipment (WEEE) and end-of-life vehicles (ELVs). Wire harnesses usually consist of copper (Cu) strands coated with thin polyvinyl chloride (PVC) cables. Current technologies for recycling this waste are either ineffective or have significant limitations because they are currently only available for thick and uniform cables. Therefore, this work developed combined PVC swelling by organic solvent and ball or rod milling approaches for the recovery of high purity Cu and PVC from thin and ununiform cables in waste wire harnesses. We developed both lab-scale and bench-scale milling reactors to thoroughly investigate the milling efficiency and the separation mechanism, and the subsequent scaling up for the developed process. The PVC swelling behavior and the plasticizer removal from the PVC coatings by the selected organic solvents were thoroughly evaluated by employing Hansen Solubility Parameters (HSPs) and the effectiveness of the swelling ratio on the separation of PVC coatings and Cu wires were investigated by using lab-scale reactor. n-Butyl acetate and acetone were selected as the best solvents for PVC swelling and plasticizer removal. This work achieved complete recovery of PVC coatings, Cu wires, and plasticizers from the waste WH cables by the bench-scale reactors. Thus, this work established both the academic and technical bases of the developed approaches combining PVC swelling and milling processes.