An in situ approach for the synthesis of a gum ghatti-g-interpenetrating terpolymer network hydrogel for the high-performance adsorption mechanism evaluation of Cd(II), Pb(II), Bi(III) and Sb(III)
An in situ approach for the synthesis of a gum ghatti-g-interpenetrating terpolymer network hydrogel for the high-performance adsorption mechanism evaluation of Cd(II), Pb(II), Bi(III) and Sb(III)
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DOI：
10.1039/c8ta01106k
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发表时间：
2018-05
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通讯作者：
N. Singha;M. Karmakar;M. Mahapatra;Himarati Mondal;Arnab Dutta;Mousumi Deb;Madhushree Mitra;Chandan Roy;P. Chattopadhyay
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文献类型：
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作者：
N. Singha;M. Karmakar;M. Mahapatra;Himarati Mondal;Arnab Dutta;Mousumi Deb;Madhushree Mitra;Chandan Roy;P. Chattopadhyay
本文研究了一种新型互穿三元共聚物网络水凝胶（gtinamsa），该凝胶具有前所未有的热机械和物理化学性能以及优异的可回收性。以N，N ' -亚甲基双丙烯酰胺（MBA）和过硫酸钾(PPS)/亚硫酸氢钠（SBS）分别作为交联剂和氧化还原对引发剂，在丙烯酸钠（SA）和N-异丙基丙烯酰胺（NIPAMPA）溶液聚合过程中，通过接枝甘树胶（GTI）和3-（N-异丙基丙烯酰胺）丙酸（NIPAMPA）原位策略突出合成。通过系统的多阶段优化组分和反应温度，全面了解有害金属离子M（II/III）、Cd（II）、Pb（II）、Bi（III）、Sb（III）的超吸附机理。通过FTIR、1H-/13C-NMR、C 1s-/O 1s-/Cd 3d5/2,3/2-/Pb 4f7/2,5/2-/Bi 4f7/2,5/2-/Sb 3d3/2-XPS、TGA、XRD、FESEM和EDX等多种微观结构分析，以及凝胶含量（% GC）、零电荷点pH （pHPZC）、%接枝率（% GR）和水凝胶的网络参数。通过FTIR、拟合动力学数据以及吸附活化能的测量，研究了gtinamsa和M（II/III）之间的离子(I)和杂配相互作用，如单齿(M)、双齿桥接（BB）和双齿螯合（BC）。M（II/III）的平衡吸附数据与Langmuir等温线模型拟合良好。在303 K、吸附剂剂量为0.02 g、M（II/III）初始浓度为500 ~ 800 ppm的条件下，对Cd（II）、Pb（II）、Bi（III）和Sb（III）的最大吸附量（ACs）分别为1477.83、1568.81、1582.38和1518.09 mg g−1。
Herein, gum ghatti-g-(N-isopropylacrylamide-co-3-(N-isopropylacrylamido) propanoic acid-co-sodium acrylate) (GTINIAMSA), a novel interpenetrating terpolymer network hydrogel with unprecedented thermomechanical and physicochemical properties and excellent recyclability, was synthesized via the grafting of gum ghatti (GTI) and the in situ strategic protrusion of 3-(N-isopropylacrylamido) propanoic acid (NIPAMPA) during the solution polymerization of sodium acrylate (SA) and N-isopropylacrylamide (NIPAm) using N,N′-methylenebisacrylamide (MBA) and potassium persulfate (PPS)/sodium bisulfite (SBS) as a cross-linker and redox pair of initiators, respectively, through the systematic multistage optimization of the constituents and the reaction temperature for a comprehensive understanding of the superadsorption mechanism of hazardous metal ions, i.e. M(II/III), like Cd(II), Pb(II), Bi(III) and Sb(III). The unorthodox in situ attachment of NIPAMPA, grafting of GTI into NIPAm-co-NIPAMPA-co-SA (NIAMSA) matrix and the superadsorption mechanism were systematically investigated via extensive unloaded and/or loaded microstructural analyses by FTIR, 1H-/13C-NMR, C 1s-/O 1s-/Cd 3d5/2,3/2-/Pb 4f7/2,5/2-/Bi 4f7/2,5/2-/Sb 3d3/2-XPS, TGA, XRD, FESEM and EDX, along with the measurements of the %gel content (% GC), pH at point of zero charge (pHPZC), % graft ratio (% GR) and network parameters of the hydrogels. The prevalence of ionic (I) and variegated coordinative interactions, such as monodentate (M), bidentate bridging (BB) and bidentate chelation (BC), between GTINIAMSA and M(II/III) were also investigated by FTIR and the fitting of kinetics data to a pseudo-second-order model as well as by the measurements of the activation energies of adsorption. The equilibrium adsorption data of M(II/III) were fitted excellently to the Langmuir isotherm model. The thermodynamically spontaneous chemisorption processes showed the excellent maximum adsorption capacities (ACs) of 1477.83, 1568.81, 1582.38 and 1518.09 mg g−1 for Cd(II), Pb(II), Bi(III), and Sb(III), respectively, at 303 K with an adsorbent dose of 0.02 g and initial concentration of M(II/III) = 500–800 ppm.