Silver-decorated ZIF-8 derived ZnO concave nanocubes for efficient photooxidation-adsorption of iodide anions: An in-depth experimental and theoretical investigation

被引：19

作者：

Chen, Jiuyu ^{[1
]}

Gu, Aotian ^{[1
]}

Miensah, Elvis Djam ^{[1
]}

Liu, Ying ^{[1
]}

Wang, Peng ^{[1
]}

Mao, Ping ^{[2
]}

Gong, Chunhui ^{[1
]}

Jiao, Yan ^{[3
]}

Chen, Kai ^{[3
]}

Zhang, Zongxiang ^{[4
]}

Yang, Yi ^{[1
,3
]}

机构：

[1] Nanjing Univ Sci & Technol, Sch Environm & Biol Engn, Jiangsu Key Lab Chem Pollut Control & Resources R, Nanjing 210094, Peoples R China

[2] Huaiyin Inst Technol, Fac Chem Engn, Key Lab Palygorskite Sci & Appl Technol Jiangsu P, Huaian 223003, Peoples R China

[3] Nanjing Univ Informat Sci & Technol, Collaborat Innovat Ctr Atmospher Environm & Equip, Jiangsu Key Lab Atmospher Environm Monitoring & P, Nanjing 210044, Peoples R China

[4] Taizhou Environm Monitoring Ctr, Jiangsu Environm Protect Key Lab Monitoring Organ, Taizhou 225300, Peoples R China

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2021年 / 297卷

基金：

中国国家自然科学基金;

关键词：

Ag-decorated ZnO CNCs; ZIF-8; Radioactive iodide; Photooxidation-adsorption; DFT calculation; LIGHT-DRIVEN PHOTOCATALYST; METAL-ORGANIC FRAMEWORKS; RADIOACTIVE IODIDE; PHOSPHATE REMOVAL; TRI-IODIDE; PERFORMANCE; WATER; IONS; NANOSTRUCTURES; NANOCOMPOSITE;

D O I：

10.1016/j.jssc.2021.122039

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Elimination of radioactive iodide (I) from complex solution of used nuclear fuel directly is the optimum scheme in the remediation of iodide released into the environment. However, this assignment represents a tremendous challenge given the combined harsh conditions of strong acidity, high ionic strength, and strong ionizing radiation field. Here, we surmount the challenge by applying silver-decorated ZIF-8 derived ZnO concave nanocubes (CNCs) (denoted as AZ) as a potential photocatalyst and adsorbent for photooxidation-adsorption of I- from simulated radioactive wastewater. The as-synthesized product showed a prominent I- uptake capacity of 129.3 mg g(-1) under visible light with relatively fast kinetic adsorption process as well as remarkable selectivity, strong acid resistance and excellent gamma radiation resistance. The uptake process, with spontaneity and exothermic, followed the pseudo-second-order kinetics and Langmuir isotherm models. The mechanism explaining the excellent properties was investigated systematically and could be epitomized into the following: AZ nanocomposites possessed the cumulative effects of the uptake performance of Ag2O for I-, the photooxidation property of Ag(0)@ZnO CNCs for oxidation of I- to I-2 under visible light. Density functional theory (DFT) calculations further revealed that I-2 was more likely to bind to nearby Ag site yielding AgI, or be trapped readily by AgI to form AgI3. Overall, our work provides a facile and useful pathway toward radioactive iodine elimination.

引用

页数：11