Department of Chemical Engineering, Khalifa University of Science and Technology, PO Box 2533, Abu Dhabi, United Arab Emirates.
Department of Applied Science, CT Group of Institutions Shahpur, Jalandhar, Punjab, India.
Int J Biol Macromol. 2018 Jul 15;114:283-294. doi: 10.1016/j.ijbiomac.2018.03.131. Epub 2018 Mar 23.
In this work, an environmentally friendly gum ghatti-crosslinked-polyacrylamide (Gg-cl-PAAM) hydrogel was synthesized from gum ghatti (Gg) and acrylamide (AAM) using a microwave-assisted grafting technique, and tested for use in water purification applications as an adsorbent and flocculent. The Gg-cl-PAAM was characterized using SEM, FTIR, and TGA, and displayed pH responsive swelling behavior, with maximum swelling (2117%) observed in solution with neutral pH. The flocculation characteristics of Gg-cl-PAAM were tested in clay solutions as a function of pH, temperature, and the polymer mass loading, showing that the best performance is obtained at neutral pH at 40°C. The adsorption capacities of Gg-cl-PAAM for the removal different dyes such as brilliant green (BG), rhodamine B (RhB), congo red (CR), and methyl orange (MO) were tested, revealing that the adsorption of all dyes followed the Langmuir isotherm model, with q values of 523.62mgg for BG, 421.60mgg for RhB, 179.09mgg for CR, and 173.69mgg for MO. Finally, the environmentally friendly nature of Gg-cl-PAAM was examined using the soil-burial composting method, which demonstrated 93% degradation of the Gg-cl-PAAM hydrogel within 60days.
在这项工作中，我们使用微波辅助接枝技术，由刺槐豆胶（Gg）和丙烯酰胺（AAM）合成了一种环保的刺槐豆胶交联聚丙烯酰胺（Gg-cl-PAAM）水凝胶，并将其作为吸附剂和絮凝剂测试用于水净化应用。通过 SEM、FTIR 和 TGA 对 Gg-cl-PAAM 进行了表征，其显示出 pH 响应的溶胀行为，在中性 pH 溶液中观察到最大溶胀（2117%）。测试了 Gg-cl-PAAM 在粘土溶液中的絮凝特性，作为 pH、温度和聚合物质量负载的函数，结果表明在 40°C 中性 pH 下获得最佳性能。还测试了 Gg-cl-PAAM 对去除不同染料（如亮绿（BG）、罗丹明 B（RhB）、刚果红（CR）和甲基橙（MO））的吸附能力，结果表明所有染料的吸附均遵循朗缪尔等温线模型，BG 的 q 值为 523.62mgg，RhB 的 q 值为 421.60mgg，CR 的 q 值为 179.09mgg，MO 的 q 值为 173.69mgg。最后，使用土壤掩埋堆肥法检查了 Gg-cl-PAAM 的环保特性，结果表明在 60 天内 Gg-cl-PAAM 水凝胶的降解率达到 93%。
