Department of Chemistry, An-Najah National University, P.O. Box 7, Nablus, Palestine.
Laboratory of Applied Chemistry and Environment, ENSA, Université Ibn Zohr, PO Box 1136, 80000, Agadir, Morocco.
Environ Sci Pollut Res Int. 2018 Aug;25(22):22060-22074. doi: 10.1007/s11356-018-2107-y. Epub 2018 May 25.
The work shown in this article demonstrate a novel example of converting olive industry solid waste (OISW) into a magnetic cellulose nanocrystalline (MNCs) to serve as selective magnetic sorbents for methylene blue. Olive industry solid waste contains about 40% cellulose. The cellulose was extracted in a powder form from olive industry solid waste by subjecting it to a multistep pulping and bleaching process. The extracted powder cellulose was then converted to nanocrystalline cellulose (NCs) by acid hydrolysis. The NCs were then treated with a solution of FeCl.6HO, FeSO, and HO by a colloidal suspension method which produced free-flowing porous MNCs. The produced MNCs are characterized by several spectroscopic and analytical techniques such as SEM, TEM, XRD, FTIR VSM, and TGA. The efficiency of the three polymers cellulose powder, NCs, and MNCs toward extracting methylene blue (MB) from water was evaluated. Cellulose powder and NCs showed acceptable tendency for methylene blue. However, MNCs showed excellent extraction efficiency toward MB. The thermodynamic studies revealed a spontaneous adsorption of MB by MNCs at various temperatures. The spontaneous adsorption could be attributed to the electrostatic interaction and H-bonding between MNCs and MB. However, the interaction between cellulose, NCs, and MB is limited to the H-bonding.
本文展示了一个将橄榄工业固体废物（OISW）转化为磁性纤维素纳米晶体（MNCs）的新实例，用作亚甲基蓝的选择性磁性吸附剂。橄榄工业固体废物含有约 40%的纤维素。通过对橄榄工业固体废物进行多步制浆和漂白处理，以粉末形式从橄榄工业固体废物中提取纤维素。然后通过酸水解将提取的粉末纤维素转化为纳米纤维素（NCs）。然后通过胶体悬浮法用 FeCl.6HO、FeSO 和 HO 的溶液处理 NCs，产生自由流动的多孔 MNCs。通过 SEM、TEM、XRD、FTIR VSM 和 TGA 等几种光谱和分析技术对所制备的 MNCs 进行了表征。评估了三种聚合物纤维素粉末、NCs 和 MNCs 从水中提取亚甲基蓝（MB）的效率。纤维素粉末和 NCs 对亚甲基蓝显示出可接受的趋势。然而，MNCs 对 MB 具有优异的萃取效率。热力学研究表明，MNCs 在不同温度下自发吸附 MB。这种自发吸附可以归因于 MNCs 和 MB 之间的静电相互作用和氢键。然而，纤维素、NCs 和 MB 之间的相互作用仅限于氢键。
