Studies on the Properties and the Structure of Regenerated Humic Acids (I):Fractionation by Gel Filtration on Sephadex and the Properties of Fractions of Regenerated Humic Acids
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Regenerated humic acids (HA I) prepared by nitric acid oxidation of four kinds of coals (C: 75.7-87.1%) were fractionated on Sephadex G-75 gel with 0.75N NaOH solution and the elution curve and IR spectral data of the fractions obtained were examined in comparison with those of the other humic acids prepared by the other methods or from lignite.The elution curves showed two peaks at higher and lower molecular weight parts and that of higher molecular weight part increased its hight with the increase of the carbon content of raw coal. While the measure of aliphatic hydrocarbon contents obtained from IR spectral dota was high at higher molecular weight part and steeply decreased to low value with the decrease in molecular weight, that of carboxyl group contents increased with the decrease in molecular weight and with advancing the oxidation. Regenerated humic acid (HA II and III) prepared by air oxidation and by alkali fusion, natural humic acid (HA IV) and regenerated humic acid (HA V) prepared by nitric acid oxidation of lignite were also fractionated. HA II showed similar elution curves to HA I. The curve of HA III was specific and rich in high molecular weight part. Those of HA IV, HA V were very similar with each other and rich in low molecular weight part. The fractions from Takamatsu regenerated humic acid prepared by nitric acid oxidation were further studied on their molecular weight, neutralization equivalent weight and ion exchange properties. The weightaverage molecular weight (<I>M<SUB>w</SUB></I>) of each fraction determined by sedimentation equilibrium method was ranged from 4.103 to 1.105 and decreased reversely with the increase of the elution volume. The molecular weight distribution was calculated from the relation of elution volume/void volume value to log <I>M<SUB>w</SUB></I>. Neutralization equivalent weight of the fractions decreased with the increase of molecular weight. Adsorption capacity of Cd ion on the fractions in CdCl<SUB>2</SUB> solution at initial pH 5 was in a range from 1. 37 to 0.88 meq./g and increased with the decrease in molecular weight. A measure of the relative affinity of the adsorption of copper ion was also determined from the adsorption equilibrium data. The value of the lowest molecular weight part was about 340 times that of the highest molecular weight part. The results on the adsorption revealed that the chelating ability was more remarkable in the lower molecular weight parts.
- 一般社団法人 日本エネルギー学会の論文
一般社団法人 日本エネルギー学会 | 論文
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