Removal of hexavalent chromium ion from aqueous solution using nanoscale zero-valent iron particles immobilized on porous silica support prepared by polymer template method

2018 ◽  
Vol 35 (10) ◽  
pp. 2015-2023 ◽  
Author(s):  
Minchae Jang ◽  
Boyeong Park ◽  
Hyunseung Lee ◽  
Tae-Yong Kim ◽  
Yangsoo Kim
Keyword(s):  
Aqueous Solution ◽  
Hexavalent Chromium ◽  
Porous Silica ◽  
Zero Valent Iron ◽  
Template Method ◽  
Silica Support ◽  
Iron Particles ◽  
Chromium Ion ◽  
Nanoscale Zero Valent Iron ◽  
Polymer Template

scholarly journals Degradation of the antibiotic ornidazole in aqueous solution by using nanoscale zero-valent iron particles: kinetics, mechanism, and degradation pathway

RSC Advances ◽  
2018 ◽  
Vol 8 (61) ◽  
pp. 35062-35072 ◽  
Author(s):  
Yanchang Zhang ◽  
Lin Zhao ◽  
Yongkui Yang ◽  
Peizhe Sun
Keyword(s):  
Aqueous Solution ◽  
Degradation Process ◽  
Degradation Pathway ◽  
Zero Valent Iron ◽  
Main Mechanism ◽  
Iron Particles ◽  
Nanoscale Zero Valent Iron ◽  
Nitro Reduction

The whole possible process of ONZ removal by nZVI. The reduction on the surface of nZVI was the main mechanism. A potential pathway including dechlorination, nitro reduction, N-denitration, and cleavage was proposed for the degradation process.

Removal of chloramphenicol from aqueous solution by nanoscale zero-valent iron particles

2014 ◽  
Vol 257 ◽  
pp. 98-104 ◽  
Author(s):  
Siqing Xia ◽  
Zaoli Gu ◽  
Zhiqiang Zhang ◽  
Jiao Zhang ◽  
Slawomir W. Hermanowicz
Keyword(s):  
Aqueous Solution ◽  
Zero Valent Iron ◽  
Iron Particles ◽  
Nanoscale Zero Valent Iron

scholarly journals High dispersions of nano zero valent iron supported on biochar by one-step carbothermal synthesis and its application in chromate removal

RSC Advances ◽  
2019 ◽  
Vol 9 (22) ◽  
pp. 12428-12435 ◽  
Author(s):  
Shifeng Li ◽  
Tingting You ◽  
Yang Guo ◽  
Shuhua Yao ◽  
Shuyan Zang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Hexavalent Chromium ◽  
Zero Valent Iron ◽  
Synthesis And Characterization ◽  
Carbothermal Synthesis ◽  
Nanoscale Zero Valent Iron ◽  
Nano Zero Valent Iron ◽  
One Step

A one-step carbothermal synthesis and characterization of biochar-supported nanoscale zero-valent iron (nZVI/BC) was performed for the removal of hexavalent chromium (Cr(vi)) from aqueous solution.

Carbothermal Synthesis of Carbon-supported Nanoscale Zero-valent Iron Particles for the Remediation of Hexavalent Chromium

2008 ◽  
Vol 42 (7) ◽  
pp. 2600-2605 ◽  
Author(s):  
Laura B. Hoch ◽  
Elizabeth J. Mack ◽  
Bianca W. Hydutsky ◽  
Jessica M. Hershman ◽  
Joanna M. Skluzacek ◽  
...  
Keyword(s):  
Hexavalent Chromium ◽  
Zero Valent Iron ◽  
Iron Particles ◽  
Carbothermal Synthesis ◽  
Nanoscale Zero Valent Iron

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.

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