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Adsorption of heavy metal ions from aqueous solution by fly ash

机译：粉煤灰从水溶液中吸附重金属离子

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摘要

The removal characteristics of lead and copper ions from aqueous solution by fly ash were investigated under various conditions of contact time, pH and temperature. The influence of pH of the metal ion solutions on the uptake levels of the metal ions by fly ash were carried out between pH 4 and 12. The level of uptake of Pb~(2+) and Cu~(2+) ions by the fly ash generally increased, but not in a progressive manner, at higher pH values. The effect of temperature on the uptake of Pb~(2+) and Cu~(2+) ions was investigated between 30℃ and 60℃, the adsorption of being enhanced at the lowest temperature. Rate constants were evaluated in terms of a first-order kinetics. The rate constant, k for uptake of Pb~(2+) and Cu~(2+) ions were 1.77 x 10~(-2) s~(-1) and 2.11 x 10~(-2) s~(-1), respectively. The experimental results underline the potential of coal fly ash for the recovery of metal ions from waste water. The main mechanisms involved in the removal of heavy metal ions from solution were adsorption at the surface of the fly ash and precipitation.
机译：研究了在不同的接触时间，pH和温度条件下，粉煤灰从水溶液中去除铅和铜离子的特性。在pH值为4至12的条件下，研究了金属离子溶液的pH值对粉煤灰吸收金属离子的影响。Pb〜（2 +）和Cu〜（2 +）离子的吸收水平。在较高的pH值下，粉煤灰通常会增加，但不会逐渐增加。在30〜60℃范围内研究了温度对Pb〜（2+）和Cu〜（2+）离子吸收的影响，并在最低温度下增强了吸附。根据一级动力学评估速率常数。吸收Pb〜（2+）和Cu〜（2+）离子的速率常数k为1.77 x 10〜（-2）s〜（-1）和2.11 x 10〜（-2）s〜（- 1）。实验结果强调了粉煤灰从废水中回收金属离子的潜力。从溶液中去除重金属离子的主要机理是粉煤灰表面的吸附和沉淀。

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