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偏高岭土基地聚合物吸附铜离子的行为研究
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摘要
地聚合物是一类新兴的重金属吸附剂。为了更好的理解地聚合物对水中Cu~(2+)的吸附规律,本文以偏高岭土为原料,以硅酸钠和氢氧化钠为激活剂制备地聚合物,利用吸附等温式、动力学公式、热力学公式、Elovich公式和Weber-Morris公式,揭示地聚合物吸附Cu~(2+)的吸附方式及过程。结果表明:Cu~(2+)理论最大吸附量是40.161mg·g~(-1);吸附动力学满足表观二级动力学方程;Cu~(2+)吸附过程分为四步,在0min~0.5min内存在一个快速吸附的过程,0.5min~3min内Cu~(2+)出现了释放,3min~30min Cu~(2+)去除率随时间增加,并在30min后Cu~(2+)吸附逐渐达到平衡;地聚合物对Cu~(2+)的吸附属于物理吸附,吸附过程自发吸热。
The kinetics and thermodynamics of the adsorption isotherm of geopolymers on the Cu~(2+) adsorption process were studied in this paper. The results showed that the adsorption process was in accordance with the Freundlich adsorption isotherm equation. The adsorption capacity of Cu~(2+) was 40.161mg·g~(-1), and adsorption process meet the pseudo-second-order kinetics equation. Elovich formula, Weber-Morris formula and dynamic boundary formula showed that the adsorption process of Cu~(2+) was divided into four steps. The rapid adsorption of Cu~(2+) by geopolymers was appeared in first 0.5min. Gibbs free energy change indicate that the geopolymers of Cu~(2+) adsorption was a spontaneous process. Adsorption of Cu~(2+) was affected the electron cloud of silicon and aluminum, but do not changed the way they connection.
引文
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