吸附
亚甲蓝
弗伦德利希方程
自愈水凝胶
化学工程
傅里叶变换红外光谱
活性炭
生物相容性
核化学
复合数
化学
材料科学
高吸水性高分子
聚合物
高分子化学
有机化学
复合材料
催化作用
工程类
光催化
作者
Syed Sikandar Shah,Bruno Ramos,Antonio Carlos Silva Costa Teixeira
出处
期刊:Water
[MDPI AG]
日期:2022-10-20
卷期号:14 (20): 3313-3313
被引量:6
摘要
Hydrogels have attracted great attention as good adsorbents due to their extraordinary water retention capacity, unique hydrophilic nature, biocompatibility, and abundance in availability. In this work, a superabsorbent polymer (SAP) hydrogel and its composite were synthesized, with the introduction of activated charcoal (SAP-AC) for deep removal of the ecotoxic organic dye methylene blue (MB). The formation of the hydrogel was confirmed by FTIR analysis, and scanning electron microscopy (SEM) revealed the appearance of a porous microstructure due to the incorporation of AC. A continuous upflow column was set up, and the adsorption parameters were optimized using an experimental Doehlert uniform array design. The residual concentration of MB was analyzed by UV-Vis spectrophotometry at 665 nm (λmax). The experimental data were also discussed in terms of adsorption kinetics and adsorption isotherm models. Accordingly, MB adsorption followed pseudo second-order kinetics and better fits the Freundlich isotherm, suggesting a chemisorption mechanism and a multilayer MB adsorption system. The maximum adsorption capacity was 202.84 mg g−1 (96.96%) using the SAP and 213.2 mg g−1 (99.48%) using the SAP-AC. The present study proved that the synthesized composite hydrogel has good activity and selectivity for deep removal of the MB dye and can be effectively used in wastewater treatment.
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