Nuclear Chemistry Department, Hot Laboratories Center, Egyptian Atomic Energy Authority, Inshas, Cairo 13759, Egypt.
Nuclear Chemistry Department, Hot Laboratories Center, Egyptian Atomic Energy Authority, Inshas, Cairo 13759, Egypt.
Int J Biol Macromol. 2019 Sep 1;136:1273-1281. doi: 10.1016/j.ijbiomac.2019.06.081. Epub 2019 Jun 12.
A series of polyampholyte nanocomposite biopolymers, poly(N,N-diallyldimethylammonium chloride-co-acrylamide) grafted on carboxymethylcellulose/iron(III) oxide [P(DADMAC-AAm)CMC/FeO] and poly(N,N-diallyldimethylammonium chloride-co-sodium acrylate) grafted on carboxymethylcellulose/iron(III) oxide [P(DADMAC-SA)CMC/FeO], was prepared with different molar ratios of anionic groups to cationic groups using gamma irradiation. The grafting properties and swelling behavior were investigated as a function of grafting conditions such as DADMAC, AAm, SA, and CMC concentrations and absorbed dose. Fourier transform infrared spectroscopic analysis (FTIR) confirmed the graft copolymerization. Scanning electron microscope (SEM) was employed to check the morphological structure of CMC, P(DADMAC-AAm)CMC/FeO, and P(DADMAC-SA)CMC/FeO. Thermogravimetric analysis (TGA) and differential thermal analysis (DTA) further characterized the grafted copolymers and showed their high thermal stability. Using batch sorption experiments and Co as a radiotracer, P(DADMAC-AAm)CMC/FeO and P(DADMAC-SA)CMC/FeO were evaluated for Co(II) removal from aqueous solutions. Experimentally, P(DADMAC-AAm)CMC/FeO and P(DADMAC-SA)CMC/FeO show high sorption capacity of Co(II), i.e. 69.67 mg g and 75.17 mg g, respectively, which makes them potential sorbents for Co(II) removal from water/wastewater. Finally, the Co(II) sorption was examined using sorption isotherm and kinetic models. Cobalt sorption was best fitted to Langmuir model which suggests the sorption is of chemisorption type. On the other hand, the sorption kinetics was best represented by the pseudo-first-order kinetic model.
一系列聚两性离子纳米复合生物聚合物，即接枝羧甲基纤维素/三氧化二铁的聚（N，N-二烯丙基二甲基氯化铵-丙烯酰胺）[P（DADMAC-AAm）CMC/FeO]和接枝羧甲基纤维素/三氧化二铁的聚（N，N-二烯丙基二甲基氯化铵-丙烯酸钠）[P（DADMAC-SA）CMC/FeO]，是通过γ射线辐照，以不同的阴离子与阳离子摩尔比制备的。通过改变 DADMAC、AAm、SA 和 CMC 浓度以及吸收剂量等接枝条件，研究了接枝性能和溶胀行为。傅里叶变换红外光谱分析（FTIR）证实了接枝共聚反应。扫描电子显微镜（SEM）用于检查 CMC、P（DADMAC-AAm）CMC/FeO 和 P（DADMAC-SA）CMC/FeO 的形态结构。热重分析（TGA）和差示热分析（DTA）进一步表征了接枝共聚物，并显示了它们的高热稳定性。使用批量吸附实验和 Co 作为放射性示踪剂，评估了 P（DADMAC-AAm）CMC/FeO 和 P（DADMAC-SA）CMC/FeO 从水溶液中去除 Co(II)的性能。实验结果表明，P（DADMAC-AAm）CMC/FeO 和 P（DADMAC-SA）CMC/FeO 对 Co(II)具有较高的吸附能力，分别为 69.67 mg/g 和 75.17 mg/g，这使它们成为从水中/废水中去除 Co(II)的潜在吸附剂。最后，使用吸附等温线和动力学模型研究了 Co(II)的吸附。Co(II)的吸附最符合 Langmuir 模型，表明吸附是化学吸附类型。另一方面，吸附动力学最好用拟一级动力学模型来表示。
