School of Food and Pharmacy, Zhejiang Ocean University, Zhoushan 316022, PR China; Polymer Materials Research Department, Advanced Technology and New Materials Research Institute (ATNMRI), City of Scientific Research and Technological Applications (SRTA-City), New Borg El-Arab City, P. O. Box: 21934, Alexandria, Egypt.
Polymer Materials Research Department, Advanced Technology and New Materials Research Institute (ATNMRI), City of Scientific Research and Technological Applications (SRTA-City), New Borg El-Arab City, P. O. Box: 21934, Alexandria, Egypt.
Int J Biol Macromol. 2019 Mar 15;125:1221-1231. doi: 10.1016/j.ijbiomac.2018.09.097. Epub 2018 Sep 17.
In this study, an innovative adsorbent based on tetraethylenepentamine (TEPA) functionalized alginate (Alg) beads (TEPA-Alg) was developed for the adsorptive removal of Cr (VI) from aqueous solutions. Chemical modification of alginate surface was carried out using p-benzoquinone (PBQ) as a coupling agent followed by functionalization with TEPA. The prepared functionalized beads were characterized using FTIR, TGA, SEM, and XPS tools. Results showed that the ion exchange capacity (IEC) significantly increased from 6.34 to 10.32 m g with increasing TEPA concentration up to 0.05 M. Furthermore, removal (%) of Cr (VI) increased gradually from 38 to 86% with rising TEPA concentration from 0.0125 M to 0.05 M. While only 22% was recorded using native alginate beads. The gained equilibrium data were fitted to Langmuir isotherm model with maximum adsorption capacity ~ 77 mg/g and the adsorption kinetics were well-expressed by pseudo-first-order model. Reusability studies showed good adsorption properties after 5 consecutive cycles. Results achieved by this study imply that the prepared functionalized TEPA-Alg beads could be efficiently utilized for the removing Cr (VI) ions from their aqueous solutions.
在这项研究中，开发了一种基于四乙烯五胺（TEPA）功能化海藻酸钠（Alg）珠（TEPA-Alg）的创新吸附剂，用于从水溶液中吸附去除 Cr（VI）。使用对苯醌（PBQ）作为偶联剂对海藻酸钠表面进行化学修饰，然后用 TEPA 进行功能化。使用 FTIR、TGA、SEM 和 XPS 工具对制备的功能化珠进行了表征。结果表明，随着 TEPA 浓度从 0.0125 M 增加到 0.05 M，离子交换容量（IEC）从 6.34 显著增加到 10.32 m g。此外，随着 TEPA 浓度从 0.0125 M 增加到 0.05 M，Cr（VI）的去除率（%）从 38%逐渐增加到 86%。而使用天然海藻酸钠珠仅记录到 22%。获得的平衡数据拟合 Langmuir 等温线模型，最大吸附容量约为 77 mg/g，吸附动力学很好地由拟一级模型表示。重复使用研究表明，在 5 次连续循环后，仍具有良好的吸附性能。该研究结果表明，制备的功能化 TEPA-Alg 珠可有效地用于从其水溶液中去除 Cr（VI）离子。
