Qi Xinmiao, Xiong Xiang, Cai Haoxuan, Zhang Xuefeng, Ma Qiang, Tan Haining, Guo Xin, Lv Huiying
College of Chemistry and Chemical Engineering, Central South University of Forestry and Technology, Changsha 410004, China.
College of Chemistry and Chemical Engineering, Central South University of Forestry and Technology, Changsha 410004, China; Hunan Agricultural Product Processing Institute, Hunan Academy of Agricultural Sciences, Changsha 410125, China.
Carbohydr Polym. 2024 Dec 15;346:122601. doi: 10.1016/j.carbpol.2024.122601. Epub 2024 Aug 13.
A novel photocatalytic adsorbent, a cellulose nanofibrils based hydrogel incorporating carbon dots and BiO/BiOCOOH (designated as CCHBi), was developed to address lignin pollution. CCHBi exhibited an adsorption capacity of 435.0 mg/g, 8.9 times greater than that of commercial activated carbon. This enhanced adsorption performance was attributed to the 3D porous structure constructed using cellulose nanofibrils (CNs), which increased the specific surface area and provided additional sorption sites. Adsorption and photocatalytic experiments showed that CCHBi had a photocatalytic degradation rate constant of 0.0140 min, 3.1 times higher than that of BiO/BiOCOOH. The superior photocatalytic performance of CCHBi was due to the Z-scheme photocatalytic system constructed by carbon dots-loaded cellulose nanofibrils and BiO/BiOCOOH, which facilitated the separation of photoinduced charge carriers. Additionally, the stability of CCHBi was confirmed through consecutive cycles of adsorption and photocatalysis, maintaining a removal efficiency of 85 % after ten cycles. The enhanced stability was due to the 3D porous structure constructed by CNs, which safeguarded the BiO/BiOCOOH. This study validates the potential of CCHBi for high-performance lignin removal and promotes the application of CNs in developing new photocatalytic adsorbents.
为解决木质素污染问题，开发了一种新型光催化吸附剂，即一种包含碳点和BiO/BiOCOOH的纤维素纳米纤维基水凝胶（命名为CCHBi）。CCHBi的吸附容量为435.0 mg/g，是商业活性炭的8.9倍。这种增强的吸附性能归因于使用纤维素纳米纤维（CNs）构建的三维多孔结构，该结构增加了比表面积并提供了额外的吸附位点。吸附和光催化实验表明，CCHBi的光催化降解速率常数为0.0140 min，是BiO/BiOCOOH的3.1倍。CCHBi优异的光催化性能归因于负载碳点的纤维素纳米纤维和BiO/BiOCOOH构建的Z型光催化体系，该体系促进了光生电荷载流子的分离。此外，通过连续的吸附和光催化循环证实了CCHBi的稳定性，十个循环后去除效率保持在85%。稳定性增强归因于由CNs构建的三维多孔结构，该结构保护了BiO/BiOCOOH。本研究验证了CCHBi在高效去除木质素方面的潜力，并促进了CNs在开发新型光催化吸附剂中的应用。
