Betraoui Amina, Seddiki Nesrinne, Souag Rafika, Guerfi Nabila, Semlali Abdelhabib, Aouak Taieb, Aliouche Djamel
Laboratory of Polymers Treatment and Forming, F.S.I., M'Hamed Bougara University, Boumerdes 35000, Algeria.
Research Unit, Materials, Processes and Environment (URMPE), University of Boumerdes, Boumerdes 35000, Algeria.
Gels. 2023 Jun 19;9(6):499. doi: 10.3390/gels9060499.
Polyacrylic Acid grafted Agar-agar (AAc--Agar), and polyacrylamide grafted Agar-Agar (AAm--Agar) have been synthesised by free radical polymerisation route initiated by ammonium peroxodisulphate (APS), the grafted polymers were characterised by FTIR, TGA and SEM methods. The swelling properties were studied in deionised water and saline solution at room temperature. The prepared hydrogels were examined by removing cationic methylene blue (MB) dye from the aqueous solution, in which the adsorption kinetics and isotherms models were also investigated. It was found that the pseudo-second-order and Langmuir equations are the most suitable for the different sorption processes. The maximum dye adsorption capacity was 1035.96 mg∙g for AAc--Agar in pH medium 12 and 1015.7 mg∙g for AAm--Agar in neutral pH medium. This indicates that the AAc--Agar hydrogel could be an excellent adsorbent for removing MB from aqueous solutions.
通过过硫酸铵（APS）引发的自由基聚合路线合成了聚丙烯酸接枝琼脂（AAc-Agar）和聚丙烯酰胺接枝琼脂（AAm-Agar），采用傅里叶变换红外光谱（FTIR）、热重分析（TGA）和扫描电子显微镜（SEM）方法对接枝聚合物进行了表征。在室温下，研究了其在去离子水和盐溶液中的溶胀性能。通过从水溶液中去除阳离子亚甲基蓝（MB）染料来考察制备的水凝胶，同时还研究了其吸附动力学和等温线模型。结果发现，准二级方程和朗缪尔方程最适合不同的吸附过程。在pH为12的介质中，AAc-Agar对染料的最大吸附容量为1035.96 mg∙g，在中性pH介质中，AAm-Agar对染料的最大吸附容量为1015.7 mg∙g。这表明AAc-Agar水凝胶可能是从水溶液中去除MB的优良吸附剂。
