Characterization of the adsorption behavior of aqueous cadmium on nanozero-valent iron based on orthogonal experiment and surface complexation modeling

›› 2016, Vol. 24 ›› Issue (9): 1270-1274.

• Energy, Resources and Environmental Technology • 上一篇下一篇

Characterization of the adsorption behavior of aqueous cadmium on nanozero-valent iron based on orthogonal experiment and surface complexation modeling

Dongmei Liu, Huan Tang, Ying Zhao, Fuyi Cui, Jing Lu

1 State Key Laboratory of UrbanWater Resource and Environment, Harbin Institute of Technology, Harbin 150090, China;
2 School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China

收稿日期:2015-12-11 修回日期:2016-05-17 出版日期:2016-09-28 发布日期:2016-11-11
通讯作者: Ying Zhao,E-mail address:zhaoying@hit.edu.cn;Fuyi Cui,E-mail address:hit_cuifuyi@hotmail.com
基金资助:
Supported by the National Natural Science Foundation of China (51278147), the Funds for Creative Research Groups of China (51121062), and State Key Laboratory of Urban Water Resource and Environment (Harbin Institute of Technology) (2014TS02).

Characterization of the adsorption behavior of aqueous cadmium on nanozero-valent iron based on orthogonal experiment and surface complexation modeling

Dongmei Liu, Huan Tang, Ying Zhao, Fuyi Cui, Jing Lu

1 State Key Laboratory of UrbanWater Resource and Environment, Harbin Institute of Technology, Harbin 150090, China;
2 School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China

Received:2015-12-11 Revised:2016-05-17 Online:2016-09-28 Published:2016-11-11
Supported by:
Supported by the National Natural Science Foundation of China (51278147), the Funds for Creative Research Groups of China (51121062), and State Key Laboratory of Urban Water Resource and Environment (Harbin Institute of Technology) (2014TS02).

摘要/Abstract

摘要： Polyvinylpyrrolidone K-30 (PVP) was introduced into the preparation of nanozero-valent iron (nZVI) and the traditional liquid-phase reduction was improved. The introduction of PVP simplified the traditional method. The nZVI prepared with this new approach showed excellent surface characters and high performance on the removal of cadmium. TEM results showed that the aggregates of nZVI can reach to several micrometers in length but less than 100 nm in diameter. The iron particles that were enclosed by a layer of oxide film that is less than 10 nm, demonstrated that the nZVI possesses a core-shell structure. BET results indicate that the specific surface area of the nZVI was 20.3159m² g^-1. A three factor and three level orthogonal experiment was employed to find out the dominant factor that affects the removal rate of cadmium by nZVI. Based on the range values, the prominence order of each factor was:initial pH of the solution N initial concentration of cadmium N dosage of nZVI, the range was 96.453, 3.294 and 1.747, respectively. A simulation was performed under the same condition and a same conclusion was derived, this consistence confirmed the validity of the conclusion that pH is the most significant factor that affects the adsorption efficiency.

关键词: Cadmium, Nanozero-valent iron, Synthesis, Polyvinylpyrrolidone, Orthogonal experiment, Diffuse layer model

Abstract: Polyvinylpyrrolidone K-30 (PVP) was introduced into the preparation of nanozero-valent iron (nZVI) and the traditional liquid-phase reduction was improved. The introduction of PVP simplified the traditional method. The nZVI prepared with this new approach showed excellent surface characters and high performance on the removal of cadmium. TEM results showed that the aggregates of nZVI can reach to several micrometers in length but less than 100 nm in diameter. The iron particles that were enclosed by a layer of oxide film that is less than 10 nm, demonstrated that the nZVI possesses a core-shell structure. BET results indicate that the specific surface area of the nZVI was 20.3159m² g^-1. A three factor and three level orthogonal experiment was employed to find out the dominant factor that affects the removal rate of cadmium by nZVI. Based on the range values, the prominence order of each factor was:initial pH of the solution N initial concentration of cadmium N dosage of nZVI, the range was 96.453, 3.294 and 1.747, respectively. A simulation was performed under the same condition and a same conclusion was derived, this consistence confirmed the validity of the conclusion that pH is the most significant factor that affects the adsorption efficiency.

Key words: Cadmium, Nanozero-valent iron, Synthesis, Polyvinylpyrrolidone, Orthogonal experiment, Diffuse layer model

中图分类号:

10.1016/j.cjche.2016.05.042

Dongmei Liu, Huan Tang, Ying Zhao, Fuyi Cui, Jing Lu. Characterization of the adsorption behavior of aqueous cadmium on nanozero-valent iron based on orthogonal experiment and surface complexation modeling[J]. , 2016, 24(9): 1270-1274.

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Characterization of the adsorption behavior of aqueous cadmium on nanozero-valent iron based on orthogonal experiment and surface complexation modeling

Characterization of the adsorption behavior of aqueous cadmium on nanozero-valent iron based on orthogonal experiment and surface complexation modeling

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