Marin Nicoleta Mirela, Dolete Georgiana, Motelica Ludmila, Trusca Roxana, Oprea Ovidiu Cristian, Ficai Anton
National Research and Development Institute for Industrial Ecology ECOIND, Street Podu Dambovitei no. 57-73, District 6, 060652 Bucharest, Romania.
Science and Engineering of Oxide Materials and Nanomaterials, Faculty of Chemical Engineering and Biotechnologies, University Politehnica of Bucharest, Gh. Polizu 1-7, 011061 Bucharest, Romania.
Polymers (Basel). 2023 May 10;15(10):2251. doi: 10.3390/polym15102251.
In the present study, two chelating resins were prepared and used for simultaneous adsorption of toxic metal ions, i.e., Cr, Mn, Fe, Co, Ni, Cu, Zn, Cd, and Pb (M). In the first step, chelating resins were prepared starting with styrene-divinylbenzene resin, a strong basic anion exchanger Amberlite IRA 402(Cl) with two chelating agents, i.e., tartrazine (TAR) and amido black 10B (AB 10B). Key parameters such as contact time, pH, initial concentration, and stability were evaluated for the obtained chelating resins (IRA 402/TAR and IRA 402/AB 10B). The obtained chelating resins show excellent stability in 2M HCl, 2M NaOH, and also in ethanol (EtOH) medium. The stability of the chelating resins decreased when the combined mixture (2M HCl:EtOH = 2:1) was added. The above-mentioned aspect was more evident for IRA 402/TAR compared to IRA 402/AB 10B. Taking into account the higher stability of the IRA 402/TAR and IRA 402/AB 10B resins, in a second step, adsorption studies were carried out on complex acid effluents polluted with M. The adsorption of M from an acidic aqueous medium on the chelating resins was evaluated using the ICP-MS method. The following affinity series under competitive analysis for IRA 402/TAR was obtained: Fe(44 µg/g) > Ni(39.8 µg/g) > Cd(34 µg/g) > Cr(33.2 µg/g) > Pb(32.7 µg/g) > Cu (32.5 µg/g) > Mn(31 µg/g) > Co(29 µg/g) > Zn (27.5 µg/g). While for IRA 402/AB 10B, the following behavior was observed: Fe(58 µg/g) > Ni(43.5 µg/g) > Cd(43 µg/g) > Cu(38 µg/g) > Cr(35 µg/g) > Pb(34.5 µg/g) > Co(32.8 µg/g) > Mn(33 µg/g) > Zn(32 µg/g), consistent with the decreasing affinity of M for chelate resin. The chelating resins were characterized using TG, FTIR, and SEM analysis. The obtained results showed that the chelating resins prepared have promising potential for wastewater treatment in the context of the circular economy approach.
在本研究中，制备了两种螯合树脂并用于同时吸附有毒金属离子，即铬（Cr）、锰（Mn）、铁（Fe）、钴（Co）、镍（Ni）、铜（Cu）、锌（Zn）、镉（Cd）和铅（Pb）（M）。第一步，以苯乙烯 - 二乙烯基苯树脂、带有两种螯合剂（即酒石黄（TAR）和氨基黑10B（AB 10B））的强碱性阴离子交换树脂Amberlite IRA 402(Cl)为原料制备螯合树脂。对所得螯合树脂（IRA 402/TAR和IRA 402/AB 10B）的接触时间、pH值、初始浓度和稳定性等关键参数进行了评估。所得螯合树脂在2M盐酸、2M氢氧化钠以及乙醇（EtOH）介质中表现出优异的稳定性。当加入混合液（2M盐酸：乙醇 = 2:1）时，螯合树脂的稳定性下降。与IRA 402/AB 10B相比，上述情况在IRA 402/TAR中更为明显。考虑到IRA 402/TAR和IRA 402/AB 10B树脂具有较高的稳定性，第二步，对受M污染的复合酸性废水进行了吸附研究。使用电感耦合等离子体质谱法（ICP-MS）评估了螯合树脂对酸性水介质中M的吸附情况。在IRA 402/TAR的竞争分析下得到以下亲和序列：铁（44 µg/g）>镍（39.8 µg/g）>镉（34 µg/g）>铬（33.2 µg/g）>铅（32.7 µg/g）>铜（32.5 µg/g）>锰（31 µg/g）>钴（29 µg/g）>锌（27.5 µg/g）。而对于IRA 402/AB 10B，观察到以下情况：铁（58 µg/g）>镍（43.5 µg/g）>镉（43 µg/g）>铜（38 µg/g）>铬（35 µg/g）>铅（34.5 µg/g）>钴（32.8 µg/g）>锰（33 µg/g）>锌（32 µg/g），这与M对螯合树脂亲和力的降低一致。使用热重分析（TG）、傅里叶变换红外光谱（FTIR）和扫描电子显微镜（SEM）分析对螯合树脂进行了表征。所得结果表明，在循环经济方法的背景下，制备的螯合树脂在废水处理方面具有广阔的应用前景。
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