Enhanced photocatalytic regeneration of carboxymethyl cellulose/lignin/ ZnO complex hydrogel after methylene blue adsorption

被引:0
|
作者
Fu, Jialin [1 ]
Yap, Jia Xin [1 ]
Leo, Choe Peng [1 ]
Chang, Chun Kiat [2 ]
机构
[1] Univ Sains Malaysia, Sch Chem Engn, Engn Campus, Nibong Tebal 14300, Penang, Malaysia
[2] Univ Sains Malaysia, River Engn & Urban Drainage Res Ctr REDAC, Engn Campus, Nibong Tebal 14300, Penang, Malaysia
关键词
Hydrogel; Lignin; ZnO; CROSS-LINKING; BEADS;
D O I
10.1016/j.ijbiomac.2024.133510
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The biodegradable, nontoxic, and renewable carboxymethyl cellulose (CMC) hydrogel has been developed into a green adsorbent. However, the weak chemical interaction limits its adsorption capability and reusability. This work incorporated lignin with complex structure and ZnO nanoparticles with photocatalytic properties into CMC hydrogel beads to improve the removal of methylene blue (MB) through chemical interaction. Scanning electron microscopic images and Fourier-transform infrared spectra confirmed the compatibility between lignin and ZnO nanoparticles as well as the increment of active sites for dye removal. The MB adsorption on CMC hydrogel beads was more significantly affected by the temperate and initial concentration compared to contact time, pH, and adsorbent dosage. The MB adsorption capacity of CMC hydrogel was improved to 276.79 mg/g after incorporating lignin and ZnO nanoparticles. The adsorption followed the pseudo-second-order kinetic model and Langmuir isotherm model, indicating chemical adsorption. After 6 cycles, the adsorption capacity was reduced by about 15 %. The UV irradiation could recover and improve MB adsorption capacity of CMC hydrogel beads containing ZnO nanoparticles due to the introduction of reactive oxygen species.
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页数:9
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