Cr(vi) removal by combined redox reactions and adsorption using pectin-stabilized nanoscale zero-valent iron for simulated chromium contaminated water

RSC Advances ◽  
2015 ◽  
Vol 5 (80) ◽  
pp. 65068-65073 ◽  
Author(s):  
Dan Chen ◽  
Kai Yang ◽  
Hongyu Wang ◽  
Jun Zhou ◽  
Huining Zhang
Keyword(s):  
Redox Reaction ◽  
Redox Reactions ◽  
Zero Valent Iron ◽  
Contaminated Water ◽  
Nanoscale Zero Valent Iron

Pectin-stabilized nanoscale zero-valent iron was used to removal Cr(vi) and the main mechanisms were redox reaction and adsorption.

Environmental factors influencing remediation of TNT-contaminated water and soil with nanoscale zero-valent iron particles

2010 ◽  
Vol 45 (3) ◽  
pp. 263-274 ◽  
Author(s):  
Waraporn Jiamjitrpanich ◽  
Chongrak Polprasert ◽  
Preeda Parkpian ◽  
R. D. Delaune ◽  
Aroon Jugsujinda
Keyword(s):  
Environmental Factors ◽  
Zero Valent Iron ◽  
Contaminated Water ◽  
Iron Particles ◽  
Factors Influencing ◽  
Nanoscale Zero Valent Iron

Application of Nanoscale Zero-Valent Iron in the Remediation of DDT from Contaminated Water

2012 ◽  
Vol 1 (3) ◽  
pp. 658-668 ◽  
Author(s):  
T. POURSABERI ◽  
E. KONOZ ◽  
A. H. MOHSEN SARRAFI ◽  
M. HASSANISADI ◽  
F. HAJIFATHLI
Keyword(s):  
Zero Valent Iron ◽  
Contaminated Water ◽  
Nanoscale Zero Valent Iron

scholarly journals Arsenic Immobilization by Nanoscale Zero-Valent Iron / Immobilizacja Arsenu Przez Nanożelazo Na Zerowym Stopniu Utlenienia

2015 ◽  
Vol 22 (1) ◽  
pp. 45-59 ◽  
Author(s):  
Alena Rodová ◽  
Jan Filip ◽  
Miroslav Černík
Keyword(s):  
Czech Republic ◽  
Detection Limit ◽  
Mine Water ◽  
Iron Nanoparticles ◽  
Zero Valent Iron ◽  
Contaminated Water ◽  
Mixed Complexes ◽  
Elemental Iron ◽  
Nanoscale Zero Valent Iron ◽  
Co Precipitation

Abstract Contaminated mine water from the Kank site (Czech Republic) containing arsenic at a concentration of approximately 85 mg/dm3 was tested in a reaction with elemental iron nanoparticles. In a reductive environment there was a reduction of As to the more soluble and toxic form of As(III) depending on the pH of the solution. Oxidation of elemental iron creates oxyhydroxides which incorporate As into their structure in the form of mixed complexes and thereby remove and bind dissolved As from the solution. The addition of 0.5 g/dm3 nZVI to the contaminated water leads to a significant decrease in ORP and concentrations of As to around the detection limit. The pH of the solution is not significantly affected by the addition of nZVI. The main competing anion for co-precipitation is represented by phosphates whose concentration after the addition of nZVI was reduced to 6.5% of the original value. The resulting precipitates were analyzed by XPS, XRF, XRD, SEM-EDX and Mössbauer spectroscopy. The presence of jarosite, Schwertmannite and also arsenic probably in the form of skorodite was confirmed

Novel application of nanoscale zero valent iron and bimetallic nano-Fe/Cu particles for the treatment of cesium contaminated water

2018 ◽  
Vol 6 (4) ◽  
pp. 4253-4264 ◽  
Author(s):  
Tamer Shubair ◽  
Osama Eljamal ◽  
Ahmed M.E. Khalil ◽  
Atsushi Tahara ◽  
Nobuhiro Matsunaga
Keyword(s):  
Zero Valent Iron ◽  
Contaminated Water ◽  
Nanoscale Zero Valent Iron

Adsorption and advanced oxidation of diverse pharmaceuticals and personal care products (PPCPs) from water using highly efficient rGO–nZVI nanohybrids

2020 ◽  
Vol 6 (8) ◽  
pp. 2223-2238 ◽  
Author(s):  
Arvid Masud ◽  
Nita G. Chavez Soria ◽  
Diana S. Aga ◽  
Nirupam Aich
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Personal Care Products ◽  
Advanced Oxidation ◽  
Zero Valent Iron ◽  
Redox Activity ◽  
Personal Care ◽  
Adsorption Sites ◽  
Reduced Graphene ◽  
Nanoscale Zero Valent Iron

Reduced graphene oxide-nanoscale zero valent iron (rGO–nZVI) nanohybrid, with tunable adsorption sites of rGO and unique catalytic redox activity of nZVI, perform enhanced removal of diverse PPCPs from water.

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.

scholarly journals Efficient activation of persulfate by calcium sulfate whisker supported nanoscale zero-valent iron for methyl orange removal

RSC Advances ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 452-461
Author(s):  
Yi Han ◽  
Xian Zhou ◽  
Li Lei ◽  
Huiqun Sun ◽  
Zhiyuan Niu ◽  
...  
Keyword(s):  
Composite Material ◽  
Methyl Orange ◽  
Calcium Sulfate ◽  
Zero Valent Iron ◽  
Nanoscale Zero Valent Iron ◽  
Calcium Sulfate Whiskers ◽  
Calcium Sulfate Whisker

In order to improve the utilization of nanoscale zero-valent iron (nZVI) in activating persulfate (PS), a composite material of nZVI/CSW with nZVI supported on calcium sulfate whiskers (CSWs) was synthesized in this study.

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