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Carbonated furnace steel slag is effective in enhancing polycondensation reactions of humic precursors such as quinones, amino acids and saccharides. To obtain more detailed information concerning the nature of the catalytic sites on the surface of slag, a pristine slag sample was treated with HNO 3 , HF and NH 2 OH to alter the surface states. The catalytic activities for the formation...
The influence of pH on the surface activity of humic acid (HA), was extracted from peat soil, was investigated by surface tension (γ) measurement and the increase in solubility of p-dichlorobenzene (p-DCB). The γ for an HA solution gradually decreased with increasing concentrations of HA. As the pH was decreased, the γ versus HA concentration curve shifted into a lower HA concentration region. In...
The effects of light irradiation on the reduction rate of Fe(III) by humic acid (HA) were studied. The kinetic constants under light conditions were 140-230 times larger than those under dark conditions. Moreover, light irradiation resulted in a decrease in the activation free energy, in which the activation enthalpy was increased but the activation entropy remained unchanged. This suggests that the...
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