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Effective Removal of Chromium(III) from Low Concentration Aqueous Solution Using a Novel Diazene/Methoxy-Laced Coordination Polymer

机译:使用新型的二氮杂苯/甲氧基-配位聚合物从低浓度水溶液中有效去除铬(III)

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In this study, a novel coordination polymer [CdL 2 (H 2 O) 0.5 ] n ( 1 ), [HL = 4-(2-(4-((pyridin-3-yl)methoxy)phenyl)diazenyl)benzoic acid] was fabricated via an in situ ligand transformation reaction under solvothermal conditions. The as-prepared polymer exhibited a selectivity and efficiency for Cr(III) removal with a high uptake capacity of 106.13 mg·g ?1 . Interestingly, even in the low concentration (0.02–0.20 ppm), it still performs a relatively high efficiency (≥ 92.5%) towards the removal of Cr(III) in aqueous solution. Remarkably, it also presents good selectivity and high efficiency (93.3%) for Cr(III) removal in the presences of interfering metal ions. The good removal performance for Cr(III) was demonstrated to be a structure-dependent chemical process between polymer and Cr(III) involving the diazene and methoxy groups in polymer 1 , which happened not only on the surfaces of the adsorbent but also in the pores of polymer, giving rise to a strong affinity toward Cr(III) adsorption. The possible adsorption mechanism of Cr(III) was proposed and systematically verified by FT-IR, scanning electron microscope (SEM), atomic force microscope (AFM) and energy dispersive spectrometer (EDS) measurements.
机译:在这项研究中,一种新型的配位聚合物[CdL 2(H 2 O)0.5] n(1),[HL = 4-(2-(4-(((吡啶-3-基)甲氧基)苯基)二氮烯基)苯甲酸通过溶剂热条件下的原位配体转化反应制备[α]。所制备的聚合物显示出对Cr(III)的去除选择性和效率,并具有106.13 mg·gΔ1的高吸收能力。有趣的是,即使在低浓度(0.02–0.20 ppm)下,它对去除水溶液中的Cr(III)仍具有较高的效率(≥92.5%)。值得注意的是,在存在干扰金属离子的情况下,它对于Cr(III)的去除也具有良好的选择性和高效率(93.3%)。 Cr(III)的良好去除性能证明是聚合物与Cr(III)之间的结构依赖性化学过程,该过程涉及聚合物1中的重氮和甲氧基,这种过程不仅发生在吸附剂表面,而且发生在吸附剂表面。聚合物的孔,对Cr(III)的吸附具有很强的亲和力。提出了Cr(III)可能的吸附机理,并通过FT-IR,扫描电子显微镜(SEM),原子力显微镜(AFM)和能谱仪(EDS)进行了系统的验证。

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