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Alginate Composites Reinforced with Polyelectrolytes and Clay for Improved Adsorption and Bioremediation of Formaldehyde from Water
ACS ES&T Water ( IF 4.8 ) Pub Date : 2021-07-15 , DOI: 10.1021/acsestwater.1c00124 Yael Zvulunov 1 , Adi Radian 1
ACS ES&T Water ( IF 4.8 ) Pub Date : 2021-07-15 , DOI: 10.1021/acsestwater.1c00124 Yael Zvulunov 1 , Adi Radian 1
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In this study, polyethylenimine (PEI) and PEI-montmorillonite clay composites (PMt) were encapsulated in alginate beads, with or without formaldehyde (FA)-degrading bacteria, to remove FA from water. The effects of additives on the structural and functional properties of the beads, including their water content, stability, mechanical strength, surface area, and morphology, were studied. The adsorption kinetics and adsorption capacity of the beads were investigated, and the FA removal efficiency was established by co-encapsulating bacteria with PEI or PMt in alginate beads. Montmorillonite reduced PEI leaching and curbed swelling and shrinking effects induced by PEI–alginate interactions. The mechanical strength increased by 65% for PEI beads and up to 130% for PMt beads compared to that of plain alginate. FA adsorption reached 59 mg·g−1 for PEI beads or 32 mg·g−1 for PMt beads. When combined with FA-degrading Pseudomonas putida, the PMt composite could stabilize pH for a longer period of time, and a high removal performance was achieved upon repeated use. The obtained results highlight the potential of alginate beads reinforced by clay composites to serve as an efficient platform for the removal of FA from industrial wastewater. Furthermore, these hybrid materials could be designed to improve various chemical reactions and applied as robust sorbents and/or catalysts in industrial and environmental settings.
中文翻译：
用聚电解质和粘土增强的海藻酸盐复合材料用于改善水中甲醛的吸附和生物修复
在这项研究中，聚乙烯亚胺 (PEI) 和 PEI-蒙脱石粘土复合材料 (PMt) 被封装在海藻酸盐珠中，有或没有甲醛 (FA) 降解细菌，以从水中去除 FA。研究了添加剂对珠子结构和功能特性的影响，包括它们的含水量、稳定性、机械强度、表面积和形态。研究了珠的吸附动力学和吸附能力，并通过将细菌与 PEI 或 PMt 共包封在藻酸盐珠中来确定 FA 去除效率。蒙脱石减少了 PEI 浸出并抑制了 PEI-藻酸盐相互作用引起的膨胀和收缩效应。与普通海藻酸盐相比，PEI 珠的机械强度提高了 65%，PMt 珠的机械强度提高了 130%。FA吸附量达到59 mg·g-1对于 PEI 珠或 32 mg·g -1对于 PMt 珠。当与降解 FA 的恶臭假单胞菌结合使用时，PMt 复合物可以更长时间地稳定 pH 值，并且在重复使用时实现了很高的去除性能。获得的结果突出了由粘土复合材料增强的藻酸盐珠作为从工业废水中去除 FA 的有效平台的潜力。此外，这些混合材料可以设计为改善各种化学反应，并在工业和环境环境中用作强大的吸附剂和/或催化剂。
更新日期：2021-08-13
中文翻译：
用聚电解质和粘土增强的海藻酸盐复合材料用于改善水中甲醛的吸附和生物修复
在这项研究中，聚乙烯亚胺 (PEI) 和 PEI-蒙脱石粘土复合材料 (PMt) 被封装在海藻酸盐珠中，有或没有甲醛 (FA) 降解细菌，以从水中去除 FA。研究了添加剂对珠子结构和功能特性的影响，包括它们的含水量、稳定性、机械强度、表面积和形态。研究了珠的吸附动力学和吸附能力，并通过将细菌与 PEI 或 PMt 共包封在藻酸盐珠中来确定 FA 去除效率。蒙脱石减少了 PEI 浸出并抑制了 PEI-藻酸盐相互作用引起的膨胀和收缩效应。与普通海藻酸盐相比，PEI 珠的机械强度提高了 65%，PMt 珠的机械强度提高了 130%。FA吸附量达到59 mg·g-1对于 PEI 珠或 32 mg·g -1对于 PMt 珠。当与降解 FA 的恶臭假单胞菌结合使用时，PMt 复合物可以更长时间地稳定 pH 值，并且在重复使用时实现了很高的去除性能。获得的结果突出了由粘土复合材料增强的藻酸盐珠作为从工业废水中去除 FA 的有效平台的潜力。此外，这些混合材料可以设计为改善各种化学反应，并在工业和环境环境中用作强大的吸附剂和/或催化剂。
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