Karmakar Mrinmoy, Sadaf Somya, Ghoroi Chinmay
DryProTech Lab, Department of Chemical Engineering, Indian Institute of Technology-Gandhinagar, Palaj, Gandhinagar, Gujarat-382055, India.
ACS Omega. 2024 Jun 27;9(27):29620-29632. doi: 10.1021/acsomega.4c02772. eCollection 2024 Jul 9.
The elevated accumulation of electronic wastes, especially containing Dysprosium ion [i.e., Dy(III)], is emerging as a potential environmental threat. To overcome the deleterious effects of Dy(III), detection and removal of Dy(III) is crucial. Moreover, recovery of high-value Dy(III) is economically beneficial. However, the availability of a single material, capable of sensing Dy(III) in nanomolar concentration and simultaneously adsorbing it with high adsorption capacity (AC), is rare. Therefore, to solve this problem, a pH-responsive fluorescent amino graphene oxide-impregnated-engineered polymer hydrogel () has been synthesized, suitable for selective sensing of Dy(III) in nanomolar concentration and adsorbing it from wastewater at ambient temperature. This terpolymeric hydrogel is synthesized from two nonfluorescent monomers, propenoic acid (PNA) and prop-2-enamide (PEAM), along with an in situ generated comonomer (3-acrylamidopropanoic acid/AAPPA) through N- activation during polymerization. Surface properties and structural details of are established using NMR, FTIR, XRD, TEM, SEM, EDX, Raman, MALDI-mass, and DLS studies. The exhibits blue fluorescence with turn-off sensing of Dy(III) with the detection limit of 1.88 × 10 (M). The maximum AC of is 41.97 ± 0.39 mg g. The developed shows consistent adsorption-desorption property over five cycles, with more than 90% desorption efficiency per cycle, confirming significant recovery of the valuable Dy(III). From Logic gate calculations, complexation of Dy(III) and may be the reason behind fluorescence quenching. The also shows antibacterial action against ∼3 × 10 cells mL of solution. Overall, the developed pH-responsive engineered hydrogel can be used as a potential low-cost sensing device and reusable adsorbent for Dy(III).
电子废物的大量积累，尤其是含有镝离子[即Dy(III)]的电子废物，正成为一种潜在的环境威胁。为了克服Dy(III)的有害影响，检测和去除Dy(III)至关重要。此外，回收高价值的Dy(III)在经济上是有益的。然而，能够检测纳摩尔浓度的Dy(III)并同时以高吸附容量(AC)吸附它的单一材料却很少见。因此，为了解决这个问题，已经合成了一种pH响应型荧光氨基氧化石墨烯浸渍工程聚合物水凝胶()，适用于选择性检测纳摩尔浓度的Dy(III)并在室温下从废水中吸附它。这种三元聚合物水凝胶由两种非荧光单体丙烯酸(PNA)和丙烯酰胺(PEAM)以及通过聚合过程中的N-活化原位生成的共聚单体(3-丙烯酰胺基丙酸/AAPPA)合成。通过NMR、FTIR、XRD、TEM、SEM、EDX、拉曼、MALDI-质谱和DLS研究确定了的表面性质和结构细节。该在Dy(III)的关闭传感下呈现蓝色荧光，检测限为1.88×10 (M)。的最大AC为41.97±0.39 mg g。所开发的在五个循环中表现出一致的吸附-解吸性能，每个循环的解吸效率超过90%，证实了有价值的Dy(III)的显著回收。从逻辑门计算来看，Dy(III)与的络合可能是荧光猝灭的原因。该对~3×10个细胞/mL的溶液也显示出抗菌作用。总体而言，所开发的pH响应型工程水凝胶可作为一种潜在的低成本传感装置和Dy(III)的可重复使用吸附剂。
