Multi-Component Removal of Pb(Ii), Cd(Ii) and As(V) Over Core-Shell Structured Nanoscale Zero-Valent Iron@Mesoporous Hydrated Silica in Contaminated Water and Soil

2021 ◽  
Author(s):  
Qian Ma ◽  
Wei Teng ◽  
Yu Sun ◽  
Yanyan Chen ◽  
Yinghao Xue ◽  
...  
Keyword(s):  
Zero Valent Iron ◽  
Core Shell ◽  
Contaminated Water ◽  
Hydrated Silica ◽  
Nanoscale Zero Valent Iron

scholarly journals Well-Dispersed Nanoscale Zero-Valent Iron Supported in Macroporous Silica Foams: Synthesis, Characterization, and Performance in Cr(VI) Removal

2017 ◽  
Vol 2017 ◽  
pp. 1-13 ◽  
Author(s):  
Chaoxia Zhao ◽  
Jie Yang ◽  
Yihan Wang ◽  
Bo Jiang
Keyword(s):  
Removal Efficiency ◽  
Shell Structure ◽  
Zero Valent Iron ◽  
Core Shell ◽  
Ambient Atmosphere ◽  
Order Kinetic ◽  
Macroporous Silica ◽  
X Ray ◽  
Nanoscale Zero Valent Iron ◽  
Core Shell Structure

Well-dispersed nanoscale zero-valent iron (NZVI) supported inside the pores of macroporous silica foams (MOSF) composites (Mx-NZVI) has been prepared as the Cr(VI) adsorbent by simply impregnating the MOSF matrix with ferric chloride, followed by the chemical reduction with NaHB4 in aqueous solution at ambient atmosphere. Through the support of MOSF, the reactivity and stability of NZVI are greatly improved. Transmission electron microscopy (TEM) results show that NZVI particles are spatially well-dispersed with a typical core-shell structure and supported inside MOSF matrix. The N2 adsorption-desorption isotherms demonstrate that the Mx-NZVI composites can maintain the macroporous structure of MOSF and exhibit a considerable high surface area (503 m2·g−1). X-ray photoelectron spectroscopy (XPS) and powder X-ray diffraction (XRD) measurements confirm the core-shell structure of iron nanoparticles composed of a metallic Fe0 core and an Fe(II)/Fe(III) species shell. Batch experiments reveal that the removal efficiency of Cr(VI) can reach 100% when the solution contains 15.0 mg·L−1 of Cr(VI) at room temperature. In addition, the solution pH and the composites dosage can affect the removal efficiency of Cr(VI). The Langmuir isotherm is applicable to describe the removal process. The kinetic studies demonstrate that the removal of Cr(VI) is consistent with pseudo-second-order kinetic model.

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

Enrichment of uranium from wastewater with nanoscale zero-valent iron (nZVI)

2021 ◽  
Author(s):  
Yilong Hua ◽  
Wei Wang ◽  
Nan Hu ◽  
Tianhang Gu ◽  
Lan Ling ◽  
...  
Keyword(s):  
Zero Valent Iron ◽  
Core Area ◽  
Core Shell ◽  
The Core ◽  
Removal Mechanisms ◽  
Nanoscale Zero Valent Iron

The core–shell structured nZVI not only can separate U(vi) from tailings wastewater, but also can enrich U in core area. Removal mechanisms include encapsulation, reduction, adsorption and precipitation.

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

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