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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 9, Number 4
JKCSEZ 9(4)
August 20, 1965 

 
Title
Acidity and Adsorption Mechanism of Solid Acid

고체산의 산성도와 흡착메카니즘에 관한 연구
Author
Oh Cheun Kwun

권오천
Keywords
Abstract
한국산 산성백토류 및 일본산 백토를 1NKCI 용액으로 처리한 후 그 노액의 pH를 측정하므러써 그들의 산성도를 결정하였다. 또 KCI, NaCI, BaCI2, Pb(NO3)2 및 CuSO4 들의 중성염용액이 산성도에 미치는 영향을 조사한 결과 위의 적은 순으로 그 영향이 작음을 알았고 이것은 K+>Na+>Ba++>Cu++의 순으로 Lyotrope 계열과 일치하였다. 그리고 cation 흡착후에 백토로부터 용출되는 Al2O3 및 Fe2O3를 측정한 결과 용출양이 산성도에 대략 비례함을 알았다. 이 결과는 백토류의 산성원이 cation 교환에 의해서 1차적으로 생긴 HCI이 백토고체와 반응하여 용출한 염화물이 가수분해를 일으켜 2차적으로 HCI을 형성한다는 고바야시, 야마모토들의 설명과 일치한다. 염기성 및 산성색소의 수용액에서 백토의 색소흡착률을 측정한 결과 산성색소는 산성도와 무관계하며 흡착되지 않았으나 염기성색소의 흡착률은 산성도에 비례함을 보았다. 염기성색소흡착후의 pH는 고체산의 산성도에 비례하였으며 색소흡착률에도 비례하였으므로 염기성색소흡착은 중성염의 흡착메카니즘과 동일하다고 보았다. 본 실험결과로부터 고체산의 수용액에서의 산성원인, 색소흡착 메카니즘을 고찰하게 되었다.

Korean acid clays and Japanese acid clay were 1 N KCl solution and then their acidities were determined by measuring pH of the filtrates produced. And on examining the effect of neutral salt solution, such as KCl, NaCl, BaCl2, Pb(NO3)2 and CuSO4on the acidity, it was found that the effect decreased in order mentioned above and this situation proved to be in accord with Lyotrope series, i.e., the order of K+ > Na+>Ba++ > Pb++ > Cu++. And after adsorbing cation, Al2O3 and Fe2O3 which dissolved out of acid clay were measured, with the result that the amounts dissolved out were nearly proportional to acidity. This result accords with Kobayashi and Yamamoto's theory that the cause for acidity of clays is due to the fact that HCl which is formed initially by exchange of cation reacts with solid clay, and then chlorides dissolved out bring about hydrolysis, then resulting in the second formation of HCl. On measuring the rate which acid clay adsorbed dye in aqueous solution of basic and acid dyes, it was found that acid dye had no relation to acidity, and though it was not adsorbed by acid clay, the adsorption rate of basic dye was proportional to acidity. After adsorbing basic dye, pH was proportional to both acidity of solid acid and its adsorption rate of dye. Hence, it was concluded that the adsorption of basic dye was in accord with adsorption mechanism of neutral salt. This study led to find the acidic cause of solid acid and its adsorption mechanism of dye in aqueous solution.

Page
179 - 184
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