Abdelwahab Nourelhoda A, Ammar Nabila S, Ibrahim Hanan S
Polymers and Pigments Department, National Research Centre, 33 El Bohouth Street, Dokki-Giza P.O. 12622, Egypt.
Water Pollution Research Department, National Research Centre, 33 El Bohouth Street, Dokki-Giza P.O. 12622, Egypt.
Int J Biol Macromol. 2015 Aug;79:913-22. doi: 10.1016/j.ijbiomac.2015.05.022. Epub 2015 May 23.
In this study, cellulose acetate (CA) was modified by grafting with an equimolar binary mixture of acrylic acid (AA) and acrylamide (AAm) via radical polymerization technique using benzoyl peroxide as an initiator. Comparative studies between CA powder and modified CA [CA-g-(AA-co-AAm)] were investigated for Pb(II) ions removal and recovery from wastewater. The main operating conditions such as pH, concentration of Pb(II) ions and sorbent dose were also studied. Kinetic modeling has been studied and lead uptake capacity was calculated using the Langmuir, Freundlich and Dubinin-Kaganer-Radushkevich (DKR) models. The maximum sorption capacity (qemax) for Pb ions was only 9.4 mg/g for unmodified CA, while, it was reached to 66.67 mg/g by using modified CA. Spectroscopic analysis (FTIR), SEM, EDX and XRD analysis were investigated for CA and modified CA before and after recovery of lead ions from wastewater.
在本研究中，以过氧化苯甲酰为引发剂，通过自由基聚合技术，用丙烯酸（AA）和丙烯酰胺（AAm）的等摩尔二元混合物接枝改性醋酸纤维素（CA）。研究了CA粉末与改性CA[CA-g-(AA-co-AAm)]从废水中去除和回收Pb(II)离子的对比情况。还研究了pH值、Pb(II)离子浓度和吸附剂剂量等主要操作条件。进行了动力学建模，并使用朗缪尔、弗伦德里希和杜比宁-卡加内尔-拉杜什凯维奇（DKR）模型计算了铅吸附容量。未改性CA对Pb离子的最大吸附容量（qemax）仅为9.4 mg/g，而改性CA的最大吸附容量达到了66.67 mg/g。对从废水中回收铅离子前后的CA和改性CA进行了光谱分析（FTIR）、扫描电子显微镜（SEM）、能谱分析（EDX）和X射线衍射（XRD）分析。
