Silver nanoparticles made by green synthesis have been incorporated into pectin-based copolymer gel to make a nanocomposite gel to be used as an adsorbent material for the removal of divalent metal ions and dyes from aqueous solutions. Silver nanoparticles were obtained by mixing silver nitrate with aqueous solution of pectin followed by microwave irradiation. The nanocomposite hydrogel was obtained by the microwave-assisted polymerization of 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS) and acrylamide (AAm) in the presence of N,N’-methylene-bis-acrylamide (MBA) in pectin solution containing silver particles. Characterization of the nanocomposite gel was done by FTIR, TGA, XRD, FESEM and EDS techniques. The system was evaluated for its capacity to adsorb cationic dye, crystal violet (CV) and metal ions [Cu(II) and Pb(II)] from aqueous solutions. The presence of Ag nanoparticles is observed to enhance the adsorption capacity of the gel for the above mentioned adsorbates. The kinetic studies revealed second-order adsorption processes which fit well into Langmuir model. The evaluation of thermodynamic parameters indicated the adsorption process to be exothermic and spontaneous. A maximum of 1950 mg/g CV, 111 mg/g Cu(II) and 130 mg/g Pb(II) could be removed from the aqueous solution which is quite high in comparison with other reported materials. The desorption studies indicated the possible reusability of the nanocomposite.

中文翻译：

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用于吸附去除染料和金属离子的银纳米颗粒嵌入果胶基水凝胶

通过绿色合成制成的银纳米粒子已被掺入到果胶基共聚物凝胶中，制成纳米复合凝胶，用作吸附材料，用于从水溶液中去除二价金属离子和染料。通过将硝酸银与果胶水溶液混合然后进行微波照射来获得银纳米颗粒。纳米复合水凝胶是通过 2-丙烯酰胺-2-甲基-1-丙磺酸 (AMPS) 和丙烯酰胺 (AAm) 在 N,N'-亚甲基-双-丙烯酰胺 (MBA) 存在下的微波辅助聚合获得的。含有银颗粒的果胶溶液。通过 FTIR、TGA、XRD、FESEM 和 EDS 技术对纳米复合凝胶进行表征。对该系统吸附阳离子染料的能力进行了评估，从水溶液中提取结晶紫 (CV) 和金属离子 [Cu(II) 和 Pb(II)]。观察到 Ag 纳米粒子的存在增强了凝胶对上述吸附物的吸附能力。动力学研究揭示了适合朗缪尔模型的二级吸附过程。热力学参数的评估表明吸附过程是放热和自发的。最多可从水溶液中去除 1950 mg/g CV、111 mg/g Cu(II) 和 130 mg/g Pb(II)，与其他报道的材料相比，这是相当高的。解吸研究表明纳米复合材料可能具有可重复使用性。动力学研究揭示了适合朗缪尔模型的二级吸附过程。热力学参数的评估表明吸附过程是放热和自发的。最多可从水溶液中去除 1950 mg/g CV、111 mg/g Cu(II) 和 130 mg/g Pb(II)，与其他报道的材料相比，这是相当高的。解吸研究表明纳米复合材料可能具有可重复使用性。动力学研究揭示了适合朗缪尔模型的二级吸附过程。热力学参数的评估表明吸附过程是放热和自发的。最多可从水溶液中去除 1950 mg/g CV、111 mg/g Cu(II) 和 130 mg/g Pb(II)，与其他报道的材料相比，这是相当高的。解吸研究表明纳米复合材料可能具有可重复使用性。