College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, No. 24 South Section 1, Yihuan Road, Chengdu 610065, China; College of Biomass Science and Engineering, Key Laboratory of Leather Chemistry and Engineering of Ministry of Education, Sichuan University, No. 24 South Section 1, Yihuan Road, Chengdu 610065, China.
College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, No. 24 South Section 1, Yihuan Road, Chengdu 610065, China.
J Colloid Interface Sci. 2023 Jan 15;630(Pt A):772-782. doi: 10.1016/j.jcis.2022.10.085. Epub 2022 Oct 19.
Immobilizing catalyst system faces the challenge of balancing catalysts stability and exposure of active site in water treatment. In this study, a novel in-situ synthesis of monoclinic phase of titanium dioxide (TiO(B)) in cellulose-derived carbon aerogel (TCA) is proposed for processing multi-task in water treatment. The homogeneous gelation reaction supported the high dispersion of TiO(B) in carbon skeleton. Meanwhile, TiO acts as crosslinker to reinforce cellulose network, then the grain refinement of amorphous TiO is limited to obtain TiO(B) during carbonization. Benefiting from the reinforced structure, TCA remains the porous structure after carbonization and exposes more adsorption site than carbon aerogel blended with anatase particles (ACA). The adsorption performance of TCA are 837.3 mg/g, 1156.2 mg/g and 512.6 mg/g on methylene blue, malachite green and crystal violet, respectively. Compared with ACA, the superior interaction between TiO and graphite-like carbon improves the degradation rate of tetracycline from 1.3 × 10 min to 8.6 × 10 min, and maintains the degradation efficiency in 3 rounds cyclic test. Besides, TCA also exhibits nearly twice to ACA on absorption capacity of different oil. This facile in-situ synthesis method offers a new insight in fabricating carbon aerogel immobilized photocatalysts system for multi-task in water treatment.
固定化催化剂体系在水处理中面临着平衡催化剂稳定性和活性位暴露的挑战。在这项研究中，提出了一种在纤维素衍生的碳气凝胶（TCA）中原位合成锐钛矿相二氧化钛（TiO(B)）的新方法，用于处理水处理中的多任务。均匀的凝胶化反应支持 TiO(B)在碳骨架中的高分散。同时，TiO 作为交联剂增强纤维素网络，然后在碳化过程中限制无定形 TiO 的晶粒细化以获得 TiO(B)。受益于增强的结构，TCA 在碳化后仍保持多孔结构，并比混合有锐钛矿颗粒的碳气凝胶（ACA）暴露更多的吸附位。TCA 在亚甲基蓝、孔雀石绿和结晶紫上的吸附性能分别为 837.3、1156.2 和 512.6 mg/g。与 ACA 相比，TiO 和石墨状碳之间的优异相互作用提高了四环素的降解速率，从 1.3×10 min 提高到 8.6×10 min，并在 3 轮循环测试中保持降解效率。此外，TCA 在吸收不同油的容量上也比 ACA 高出近两倍。这种简便的原位合成方法为制备用于水处理中多任务的碳气凝胶固定化光催化剂体系提供了新的思路。
