☆ 4.7 Article

Evaluation of activated carbon fiber supported nanoscale zero-valent iron for chromium (VI) removal from groundwater in a permeable reactive column

JOURNAL OF ENVIRONMENTAL MANAGEMENT (2017)

Journal

JOURNAL OF ENVIRONMENTAL MANAGEMENT

Volume 201, Issue -, Pages 378-387

Publisher

ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD

DOI: 10.1016/j.jenvman.2017.07.010

Keywords

Nanoscale zero-valent iron; Activated carbon fiber; Heavy metal; Removal; Groundwater

Funding

National Natural Science Foundation of China [21107085]
Overseas Student's Science and Technology Activities Project Merit Funding of Shaanxi
Key Laboratory of Jiangxi Province for Persistent Control and Resources Recycle (Nanchang Hangkong Unversity) [ES201780295]
Fundamental Research Funds for the Central Universities [2452017106]

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Abstract

An activated carbon fiber supported nanoscale zero-valent iron (ACF-nZVI) composite for Cr(VI) removal from groundwater was synthesized according to the liquid phase reduction method. The techniques of N-2 adsorption/desorption, FESEM, EDX, XRD and XPS were used to characterize the ACF-nZVI composite and the interaction between the ACF-nZVI composite and Cr(VI) ions. Batch experiments were conducted to evaluate the effects of several factors, including the amount of nZVI on activated carbon fiber (ACF), pH value, initial Cr(VI) concentration, and co-existing ions on Cr(VI) removal. The results indicate that presence of ACF can inhibit the aggregation of nanoscale zero-valent iron (nZVI) particles and increase its reactivity, and the Cr(VI) removal efficiency increases with increasing amounts of nZVI on ACF and a decrease in the initial Cr(VI) concentration. In acidic conditions, almost 100% of Cr(VI) in solution can be removed after 60 min of reaction, and the removal efficiency decreases with increasing initial pH values. The Cr(VI) removal is also dependent on the co-existing ions. Reusability experiments on ACF-nZVI demonstrate that the ACF-nZVI composite can keep a high reactivity after five successive reduction cycles. The removal mechanisms are proposed as a two-step interaction including the physical adsorption of Cr(VI) on the surface or inner layers of the ACF-nZVI composite and the subsequent reduction of Cr(VI) to Cr(III) by nZVI. (C) 2017 Elsevier Ltd. All rights reserved.

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Nanocelluloses affixed nanoscale Zero-Valent Iron (nZVI) for nickel removal: Synthesis, characterization and mechanisms

Mingyang Song, Xiaolei Hu, Tianhang Gu, Wei-xian Zhang, Zilong Deng

Summary: In this study, a nanocellulose-based composite, NC-nZVI, was developed for efficient removal of nickel. The nZVI was anchored to nanocellulose through a liquid-phase reduction method, resulting in varied morphology and dispersion status. Among the developed composites, CNC-nZVI showed the most evenly distributed nZVI particles. The binding between NC and nZVI was achieved through hydrogen bonds, electrostatic attractions, coordination-covalent bonds, and steric hindrance. The CNC-nZVI composite exhibited significantly higher removal efficiency of Ni2+ compared to bare nZVI, and remained effective under a wide pH range and in the presence of interference ions like NO3-, Cl-, and Ca2+. The observed hollow-out structure and Tafel extrapolation curves indicated that CNC activated diffusion path and accelerated electronic transfer from nZVI. The superior removal performance of NC-nZVI and the abundance of raw materials make it a promising material for environmental remediation and wastewater treatment.

JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING (2022)