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首页> 外文期刊>Separation and Purification Technology >Adsorption of Cu(II), Pb(II) and humic acid on natural zeolite tuff in single and binary systems
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Adsorption of Cu(II), Pb(II) and humic acid on natural zeolite tuff in single and binary systems

机译：单一和二元体系中天然沸石凝灰岩上Cu（II），Pb（II）和腐殖酸的吸附

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摘要

A natural zeolite tuff was used for adsorption of heavy metals, Cu~(2+) and Pb~(2+), and humic acid (HA) in aqueous solution. Its adsorptive behaviour was investigated in both single component and binary component systems. For single component system, the adsorption capacities of Cu~(2+), Pb~(2+) and humic acid at 30 °C, pH 5 are 23, 68 and 78 mg/g, respectively. Solution pH was found to influence the adsorption. For heavy metals, adsorption is enhanced at higher pH while humic acid adsorption is reduced when solution pH is increased. In Pb~(2+)/humic-acid system, Pb~(2+) exhibits competitive adsorption with humic acid on the natural zeolite, resulting in reduced adsorption of both Pb~(2+) and humic acid. However, in Cu~(2+)/humic-acid system, competitive adsorption and complexation between Cu~(2+) and humic acid influence the adsorption, resulting in decreased adsorption of humic acid but increased adsorption of Cu~(2+). The complexation structure of Pb-HA/zeolite and Cu-HA/zeolite in three-component system was proposed as S-Pb-HA and S-HA-Cu, respectively.
机译：天然沸石凝灰岩用于吸附水溶液中的重金属，Cu〜（2+）和Pb〜（2+）以及腐殖酸（HA）。在单组分和二组分体系中都研究了其吸附行为。对于单组份系统，Cu〜（2 +），Pb〜（2+）和腐殖酸在30°C，pH 5时的吸附容量分别为23、68和78 mg / g。发现溶液的pH值影响吸附。对于重金属，当溶液的pH值升高时，在较高的pH值下吸附力增强，而腐殖酸的吸附率降低。在Pb〜（2 +）/腐植酸体系中，Pb〜（2+）在天然沸石上表现出与腐殖酸的竞争性吸附，导致Pb〜（2+）和腐殖酸的吸附降低。然而，在Cu〜（2 +）/腐植酸体系中，Cu〜（2+）与腐殖酸之间的竞争性吸附和络合影响吸附，导致腐殖酸的吸附减少，但Cu〜（2+）的吸附增加。 。提出了三组分体系中Pb-HA /沸石和Cu-HA /沸石的络合结构分别为S-Pb-HA和S-HA-Cu。

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