Cellulose nanofibril/titanate nanofiber modified with CdS quantum dots hydrogel with 3D porous structure: A stable photocatalytic adsorbent for Cr (VI) removal

被引：2

作者：

Qi, Xinmiao ^{[1
]}

Xiong, Xiang ^{[1
]}

Liu, Meng ^{[1
]}

Zhang, Yuting ^{[1
]}

Zhang, Xuefeng ^{[1
]}

Jiang, Ping ^{[2
]}

Wu, Yiqiang ^{[2
]}

Guo, Xin ^{[1
]}

Tong, Haijie ^{[3
]}

机构：

[1] Cent South Univ Forestry & Technol, Coll Sci, Changsha 410004, Peoples R China

[2] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Peoples R China

[3] Helmholtz Zentrum Hereon, Inst Surface Sci, Max Planck Str 1, D-21502 Geesthacht, Germany

来源：

CARBOHYDRATE POLYMERS | 2024年 / 326卷

关键词：

Cellulose nanofibril; Hydrogel; Photocatalysis; CdS quantum dots; HEAVY-METAL REMOVAL; CR(VI); CHROMIUM(VI); FABRICATION; WATER; COMPOSITES; REDUCTION; AEROGELS; TRENDS; ACID;

D O I：

10.1016/j.carbpol.2023.121623

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

A novel cellulose nanofibril/titanate nanofiber modified with CdS quantum dots hydrogel (CTH) was synthesized as an effective, stable, and recyclable photocatalytic adsorbent using cellulose nanofibril (CN), titanate nanofiber (TN), and CdS quantum dots. Within the CTH structure, CN formed an essential framework, creating a threedimensional (3D) porous structure that enhanced the specific surface area and provided abundant adsorption sites for Cr(VI). Simultaneously, TN modified with CdS quantum dots (TN-CdS) served as a nanoscale Z-type photocatalyst, facilitating the efficient separation of photoinduced electrons and holes, further increasing the photocatalytic efficiency. The morphological, chemical, and optical properties of CTH were thoroughly characterized. The CTH demonstrated the maximum theoretical adsorption capacity of 373.3 +/- 14.2 mg/g, which was 3.4 times higher than that of CN hydrogel. Furthermore, the photocatalytic reduction rate constant of the CTH was 0.0586 +/- 0.0038 min-1, which was 6.4 times higher than that of TN-CdS. Notably, CTH displayed outstanding stability, maintaining 84.9 % of its initial removal efficiency even after undergoing five consecutive adsorption-desorption cycles. The remarkable performance of CTH in Cr(VI) removal was attributed to its 3D porous structure, comprising CN and TN-CdS. These findings provide novel insights into developing a stable photocatalytic adsorbent for Cr(VI) removal.

引用

页数：13

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