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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
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.