scholarly journals Adsorption of arsenic from aqueous solution using a zero-valent iron material modified by the ionic liquid [Hmim]SbF6

RSC Advances ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 6577-6585
Author(s):  
Fenghui Wu ◽  
Chenyang Zhao ◽  
Guangfei Qu ◽  
Zhoupeng Yan ◽  
Yingda Zeng ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Ionic Liquid ◽  
Zero Valent Iron ◽  
Health Impacts ◽  
Iron Material

The environmental and health impacts caused by arsenic (As) in wastewater make it necessary to carefully manage As wastes.

scholarly journals Carbothermic Synthesis of Carbon-Supported Zero-Valent Iron Material for the Removal of U(Ⅵ) from Aqueous Solution

2019 ◽  
pp. 378
Author(s):  
WANG Jia-Qi ◽  
PANG HongWei ◽  
TANG Hao ◽  
YU Shu-Jun ◽  
ZHU Hong-Tao ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Zero Valent Iron ◽  
Iron Material ◽  
Carbothermic Synthesis

scholarly journals Efficient Sequestration of Hexavalent Chromium by Graphene-Based Nanoscale Zero-Valent Iron Composite Coupled with Ultrasonic Pretreatment

2021 ◽  
Vol 18 (11) ◽  
pp. 5921
Author(s):  
Haiyan Song ◽  
Wei Liu ◽  
Fansheng Meng ◽  
Qi Yang ◽  
Niandong Guo
Keyword(s):  
Aqueous Solution ◽  
Removal Efficiency ◽  
Inhibitory Effect ◽  
Ultrasonic Cavitation ◽  
Zero Valent Iron ◽  
Ultrasonic Pretreatment ◽  
Nanoscale Zero Valent Iron ◽  
Passivation Layers ◽  
Initial Ph ◽  
Two Phases

Nanoscale zero-valent iron (nZVI) has attracted considerable attention for its potential to sequestrate and immobilize heavy metals such as Cr(VI) from an aqueous solution. However, nZVI can be easily oxidized and agglomerate, which strongly affects the removal efficiency. In this study, graphene-based nZVI (nZVI/rGO) composites coupled with ultrasonic (US) pretreatment were studied to solve the above problems and conduct the experiments of Cr(VI) removal from an aqueous solution. SEM-EDS, BET, XRD, and XPS were performed to analyze the morphology and structures of the composites. The findings showed that the removal efficiency of Cr(VI) in 30 min was increased from 45.84% on nZVI to 78.01% on nZVI/rGO and the removal process performed coupled with ultrasonic pretreatment could greatly shorten the reaction time to 15 min. Influencing factors such as the initial pH, temperature, initial Cr(VI) concentration, and co-existing anions were studied. The results showed that the initial pH was a principal factor. The presence of HPO42−, NO3−, and Cl− had a strong inhibitory effect on this process, while the presence of SO42− promoted the reactivity of nZVI/rGO. Combined with the above results, the process of Cr(VI) removal in US-nZVI/rGO system consisted of two phases: (1) The initial stage is dominated by solution reaction. Cr(VI) was reduced in the solution by Fe2+ caused by ultrasonic cavitation. (2) In the following processes, adsorption, reduction, and coprecipitation coexisted. The addition of rGO enhanced electron transportability weakened the influence of passivation layers and improved the dispersion of nZVI particles. Ultrasonic cavitation caused pores and corrosion at the passivation layers and fresh Fe0 core was exposed, which improved the reactivity of the composites.

Phosphorus removal from aqueous solution by nanoscale zero valent iron in the presence of copper chloride

2016 ◽  
Vol 293 ◽  
pp. 225-231 ◽  
Author(s):  
Osama Eljamal ◽  
Ahmed M.E. Khalil ◽  
Yuji Sugihara ◽  
Nobuhiro Matsunaga
Keyword(s):  
Aqueous Solution ◽  
Phosphorus Removal ◽  
Copper Chloride ◽  
Zero Valent Iron ◽  
Nanoscale Zero Valent Iron
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