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首页> 外文期刊>RSC Advances >Selective removal of lead ions from aqueous solutions using 1,8-dihydroxyanthraquinone (DHAQ) functionalized graphene oxide; isotherm, kinetic and thermodynamic studies
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Selective removal of lead ions from aqueous solutions using 1,8-dihydroxyanthraquinone (DHAQ) functionalized graphene oxide; isotherm, kinetic and thermodynamic studies

机译：使用1,8-二羟基蒽醌（DHAQ）功能化的氧化石墨烯从水溶液中选择性去除铅离子;等温线，动力学和热力学研究

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An anthraquinone – graphene structure was fabricated and applied for the removal of lead( II ) from aqueous solution. The equilibrium occurred in about 10 min revealing the high adsorption rate at the beginning of the process. The maximum Pb( II ) adsorption capacity of the Fe _(3) O _(4) @DHAQ_GO nanocomposite was about 283.5 mg g ~(?1) that was observed at 323 K and pH 5.5. The Pb( II ) adsorption ability increased with the increasing pH. The isotherm and kinetic studies indicated that the Sips isotherm model and the linear form of the pseudo-second kinetic model had a better fit with the experimental results. The positive value of Δ H ~(0) indicated endothermic interactions between Pb( II ) and Fe _(3) O _(4) @DHAQ_GO. The negative Δ G ~(0) indicated that the reactions are spontaneous with a high affinity for Pb( II ). The positive Δ S ~(0) values indicated increasing randomness at the solid–solute interface during the adsorption process. The selective removal of Pb( II ) by the nanocomposite confirms the presence of higher-affinity binding sites for Pb( II ) than Cd( II ), Co( II ), Zn( II ), and Ni( II ) ions. Furthermore, the Fe _(3) O _(4) @DHAQ_GO nanocomposite revealed an excellent preferential adsorbent for Pb( II ) spiked in drinking water samples containing natural ion matrices. EDTA-2NA 0.01 N was found to be a better elution agent than HCl 0.1 M for the nanocomposite regeneration. After five adsorption/desorption cycles using EDTA-2NA 0.01 N, more than 84% of the adsorbed Pb( II ) was still desorbed in 30 min. Capturing sub-ppm initial concentrations of Pb( II ) and the capability to selectively remove lead from drinking water samples make the Fe _(3) O _(4) @DHAQ_GO nanocomposite practically convenient for water treatment purposes. High adsorption capacity and facile chemical synthesis route are the other advancements.
机译：制备了蒽醌-石墨烯结构，并将其用于从水溶液中去除铅（II）。平衡发生在大约10分钟内，表明该过程开始时吸附率很高。 Fe _（3）O _（4）@DHAQ_GO纳米复合材料的最大Pb（II）吸附容量约为323.50 mg g〜（？1），在323 K和pH 5.5下观察到。 Pb（II）的吸附能力随pH的增加而增加。等温线和动力学研究表明，Sips等温线模型和伪秒动力学模型的线性形式更符合实验结果。 ΔH〜（0）的正值表示Pb（II）与Fe _（3）O _（4）@DHAQ_GO之间的吸热相互作用。负的ΔG〜（0）表明反应是自发的，对Pb（II）的亲和力很高。 ΔS〜（0）的正值表示在吸附过程中固溶界面的随机性增加。纳米复合材料对Pb（II）的选择性去除证实了Pb（II）的亲和力结合位点比Cd（II），Co（II），Zn（II）和Ni（II）离子更高。此外，Fe _（3）O _（4）@DHAQ_GO纳米复合材料显示出对掺入含有天然离子基质的饮用水样品中的Pb（II）极好的优先吸附剂。对于纳米复合材料再生，发现EDTA-2NA 0.01 N比HCl 0.1 M是更好的洗脱剂。在使用0.01 N的EDTA-2NA进行五个吸附/解吸循环后，在30分钟内仍有超过84％的吸附的Pb（II）解吸。捕获低于百万分之几的Pb（II）初始浓度和从饮用水样品中选择性去除铅的能力，使得Fe _（3）O _（4）@DHAQ_GO纳米复合材料实际上方便于水处理目的。高吸附能力和便捷的化学合成路线是其他进展。

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