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首页> 外文期刊>International Journal of Environmental Science and Technology >Adsorptive separation of Pb(II) and Cu(II) from aqueous solutions using as-prepared carboxymethylated waste Lyocell fiber
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Adsorptive separation of Pb(II) and Cu(II) from aqueous solutions using as-prepared carboxymethylated waste Lyocell fiber

机译：使用制备的羧甲基化废Lyocell纤维从水溶液中吸附分离Pb（II）和Cu（II）

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摘要

Adsorptive separation of Pb(II) and Cu(II) using modified waste Lyocell fiber adsorbent was investigated in this research. The waste Lyocell fiber was functionalized through carboxymethylation of the hydroxyl moieties using sodium chloroacetate as modifying agent and was crosslinked with epichlorohydrin to provide water stability. The maximum equilibrium batch uptake in single metal system was 353.45 mg/g for Pb(II) and 98.33 mg/g for Cu(II), according to the Langmuir isotherm model. The adsorption rates were very fast and reached equilibrium within 3 and 5-10 min for Cu(II) and Pb(II), respectively. In competitive binary metal system, the uptake of Cu(II) largely decreased to 38.40 mg/g, and Pb(II) selectivity was observed. Elemental and functional characterization suggested that the adsorption proceeded by ion exchange between the adsorbent and metal ions. In a flow-through column system, adsorption followed by desorption aided in effectively eluting similar to 260 mg of Pb(II) (out of similar to 300 mg total adsorbed) from the Pb(II)-Cu(II) binary solution. Finally, the adsorbent was very effective in four successive adsorption-desorption cycles with over 99 % uptake and 94 % desorption efficiencies. The present study may provide an alternative option for waste fiber recycling and could be useful in recovering heavy metal ions from aqueous sources to complement their depleting reserves.
机译：本研究研究了使用改性废Lyocell纤维吸附剂对Pb（II）和Cu（II）的吸附分离。使用氯乙酸钠作为改性剂，通过羟基部分的羧甲基化功能将废Lyocell纤维功能化，并与表氯醇交联以提供水稳定性。根据Langmuir等温模型，单金属系统中最大的平衡批料吸收量为Pb（II）为353.45 mg / g，Cu（II）为98.33 mg / g。 Cu（II）和Pb（II）的吸附速度非常快，并分别在3和5-10分钟内达到平衡。在竞争性二元金属系统中，对Cu（II）的吸收大大降低至38.40 mg / g，并且观察到Pb（II）的选择性。元素和功能表征表明，吸附是通过吸附剂与金属离子之间的离子交换进行的。在流通式色谱柱系统中，吸附接着进行解吸有助于从Pb（II）-Cu（II）二元溶液中有效洗脱出约260 mg的Pb（II）（总吸附量类似于300 mg）。最后，该吸附剂在四个连续的吸附-解吸循环中非常有效，吸收率超过99％，解吸效率达到94％。本研究可能为废纤维回收提供另一种选择，并可用于从水源中回收重金属离子以补充其消耗量。

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