scholarly journals Bisphenol A degradation by a new acidic nano zero-valent iron diatomite composite

2016 ◽  
Vol 6 (15) ◽  
pp. 6066-6075 ◽  
Author(s):  
Lingya Ma ◽  
Hongping He ◽  
Runliang Zhu ◽  
Jianxi Zhu ◽  
Ian D. R. Mackinnon ◽  
...  
Keyword(s):  
Bisphenol A ◽  
Removal Efficiency ◽  
Zero Valent Iron ◽  
Nano Zero Valent Iron ◽  
Acidic Conditions ◽  
Ph Conditions ◽  
Iron Material

A new nano zero-valent iron material that generates acidic conditionsin situexhibits a high removal efficiency of BPA under natural pH conditions.

Influence Factors on Removal of Cadmium by Montmorillonite Supported Nano Zero-Valent Iron

2013 ◽  
Vol 807-809 ◽  
pp. 539-542 ◽  
Author(s):  
Zhi Hua Pang ◽  
Yong Liu ◽  
Jun Luo ◽  
Yu Tao Lei
Keyword(s):  
Removal Efficiency ◽  
Ph Value ◽  
Influence Factors ◽  
Zero Valent Iron ◽  
Initial Concentration ◽  
Nano Zero Valent Iron ◽  
Iron Material

The montmorillonite supported nanozero-valent iron material (MT-NZVI) was synthesized to remove cadmium (Cd). The results showed that the removal efficiency of MT-NZVI on cadmium was much higher than that of montmorillonite (MT), and the removal efficiency of MT-NZVI on cadmium reduced with the increase of the initial concentration and the pH value, but increased with the increase of the dosage.

Pre-magnetization for enhancing the iron-catalyzed activation of peroxymonosulfate via accelerating the corrosion of Fe0

2019 ◽  
Vol 79 (7) ◽  
pp. 1287-1296 ◽  
Author(s):  
Yunxin Liu ◽  
Peng Zhou ◽  
Xiaowei Huo ◽  
Yang Liu ◽  
Xin Cheng ◽  
...  
Keyword(s):  
Field Gradient ◽  
Oxidation Process ◽  
Zero Valent Iron ◽  
Gradient Force ◽  
Acid Orange 7 ◽  
Lower Field ◽  
Acidic Conditions ◽  
Reactive Radicals ◽  
Better Than

Abstract Our findings proved that micron-scale zero-valent iron (mZVI) particles with pre-magnetization combined with peroxymonosulfate (PMS) can markedly enhance the removal of acid orange 7 (AO7). Investigation into the mechanism showed that PMS accelerated the corrosion of ZVI to release Fe2+ under acidic conditions, and the in-situ generated Fe2+ further activated PMS to produce SO4•− and •OH, resulting in AO7 removal. Further, the Lorentz force strengthened the convection in the solution and the field gradient force tended to move Fe2+ from a higher to a lower field gradient at the pre-magnetized ZVI (Pre-ZVI) particle surfaces, thus indicating that pre-magnetization promoted the corrosion of ZVI to release Fe2+, which resulted in the enhancement of PMS activation. Nano-scale ZVI (nZVI) was more effective than mZVI in activating PMS to degrade AO7, but the pre-magnetization effect on mZVI was better than on nZVI. AO7 removal increased with higher ZVI and PMS dosage, lower AO7 concentration, and acidic conditions (pH = 2, 3). This study helps to understand the reactive radicals-based oxidation process with application of pre-magnetized ZVI in activating PMS.

In situ fabrication of dynamic nano zero-valent iron/activated carbon nanotubes membranes for tellurium separation

2019 ◽  
Vol 205 ◽  
pp. 278-286 ◽  
Author(s):  
Hanqiang Yu ◽  
Tao Zhang ◽  
Zefeng Jing ◽  
Jicheng Xu ◽  
Fengxian Qiu ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Activated Carbon ◽  
Zero Valent Iron ◽  
In Situ Fabrication ◽  
Nano Zero Valent Iron

scholarly journals Evaluation of Nano Zero-Valent Iron (nZVI) Activity in Solution and Immobilized in Hydrophilic PVDF Membrane for Drimaren Red X-6BN and Bisphenol-a Removal in Water

Processes ◽  
2019 ◽  
Vol 7 (12) ◽  
pp. 904
Author(s):  
Larissa L. S. Silva ◽  
Júlio A. Caldara ◽  
Ana Maria Rocco ◽  
Cristiano P. Borges ◽  
Fabiana V. Fonseca
Keyword(s):  
Bisphenol A ◽  
Polyvinylidene Fluoride ◽  
Kinetic Constant ◽  
Membrane Surface ◽  
Pollutant Removal ◽  
Zero Valent Iron ◽  
Bulk Solution ◽  
Diffusion Resistance ◽  
Nano Zero Valent Iron ◽  
Bpa Removal

Fenton reactions that involve nano zero-valent iron (nZVI) have shown high promise in the removal of organic pollutants. In this work, nZVI stabilized with carboxymethyl cellulose (CMC) was evaluated for drimaren red X-6BN (DRX-6BN, 10 mg/L) and bisphenol-a (BPA, 800 mg/L) removal. Oxidation reactions were conducted for removal of both compounds by varying nZVI/CMC concentration (0.01–5 g/L), hydrogen peroxide (H2O2, 0.01–0.1 g/L), and pH (3–9). DRX-6BN degradation rate was the highest (kinetic constant (kobs) = 4.622 h−1) when working at pH 3 and 3 g/L of nZVI/CMC. Increasing H2O2 concentration could not improve the reaction. For BPA, all the conditions tested showed removals of more than 96% with 0.02 g/L of H2O2. This result was compared with the activity of nZVI loaded in hydrophilic PVDF (Polyvinylidene fluoride) membranes by polyacrylic acid (PAA) to entrap nanoparticles to the membrane surface. As expected, the attachment of nZVI onto the membranes diminished nanoparticles’ activity; however, it is important to highlight the need for preparing a stable catalytic membrane, which could enhance pollutant removal of microfiltration membranes’ systems. This was confirmed by the percentage of iron leaching from functionalized membranes, where a higher concentration of iron in the bulk solution leads to enhancement on BPA removal. Issues with BPA diffusion resistance inside the pores were overcome by conducting the nZVI/PAA/PVDF membranes in the cross-flow system, reaching 40% of BPA removal after 3 h of permeation.

scholarly journals Size Distribution and Phosphate Removal Capacity of Nano Zero-Valent Iron (nZVI): Influence of pH and Ionic Strength

Water ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2939
Author(s):  
Dantong Lin ◽  
Liming Hu ◽  
Irene M. C. Lo ◽  
Zhigang Yu
Keyword(s):  
Ionic Strength ◽  
Size Distribution ◽  
Environmental Conditions ◽  
Colloidal Stability ◽  
Removal Rate ◽  
Phosphate Removal ◽  
Zero Valent Iron ◽  
Removal Capacity ◽  
Nano Zero Valent Iron ◽  
Ph Conditions

Nano zero-valent iron (nZVI) has been considered as a promising material for groundwater remediation in the past few decades. The size distribution of nZVI is one of the main factors that influences its transport capability and remediation capacity. However, studies on the size distribution of nZVI under different environmental conditions are still limited. In this study, the influence of the pH (pH = 5, 7, 9) and ionic strength (IS = 0, 15, 30, 45 mM) on the size distribution of nZVI are investigated. The dynamic light scattering (DLS) method is used to study the variation of the size distribution of nZVI aggregate with time, and batch tests are performed to evaluate the efficiency of phosphate removal. Meanwhile, the phosphate removal capacity of nZVI with different size distribution was examined. Experimental results show that under low IS and high pH conditions, nZVI aggregate exhibited a stable, narrow and one-peak size distribution. By contrast, under high IS and low pH conditions, nZVI exhibited a wide and complicated size distribution with multiple peak values. This different pattern in size distribution was further explained by the Derjaguin–Landau–Verwey–Overbeek (DLVO) theory. The phosphate removal rate of nZVI under acidic and neutral conditions is higher than 98% but is only 68% under alkaline conditions. The phosphate removal capacity is insensitive to the variation of IS since the removal rate is higher than 97% for different IS conditions. Favorable environmental conditions for colloidal stability and removal capacity of nZVI can be different, which needs comprehensive consideration in the application.

scholarly journals Conversion Mechanism of Biomass to Nano Zero-Valent Iron Biochar: Iron Phase Transfer and In situ Reduction

Engineering ◽  
2021 ◽  
Author(s):  
Sheng-Nan Zhuo ◽  
Hong-Yu Ren ◽  
Guo-Jun Xie ◽  
De-Feng Xing ◽  
Bing-Feng Liu
Keyword(s):  
Phase Transfer ◽  
Zero Valent Iron ◽  
In Situ Reduction ◽  
Iron Phase ◽  
Nano Zero Valent Iron

scholarly journals Preparation of zero valent iron nanomaterial via microfluidic device for Cr (VI) ion treatment

2020 ◽  
Vol 9 (1) ◽  
pp. 123-128
Author(s):  
Dung Dang Trung ◽  
Trung Dang Cu ◽  
Le Nguyen Thi ◽  
Hoan Luu Thi ◽  
Hang Le Thi Thu ◽  
...  
Keyword(s):  
Microfluidic Device ◽  
Zero Valent Iron ◽  
X Ray Diffraction ◽  
Scanning Microscope ◽  
X Ray ◽  
Chromium Ion ◽  
Morphology And Structure ◽  
Ph Conditions ◽  
Ion Treatment ◽  
Iron Material

In this study, iron nanomaterial was synthesized by a reaction between FeCl3 and NaBH4 using microfluidic device as a microreactor which is prepared by photolithography and soft molding processes. Morphology and structure of the as-prepared nanomaterial was characterized by scanning microscope and X-ray diffraction analysis methods. The collected product is zero valent iron material with the morphology is nano-sheet with the thickness is approximatly 50 nm. Hexavalent chromium ion from K2Cr2O7 solution could be removed by the as-prepared iron nanomaterial. The removal of ions Cr(VI) is determined and confirmed by the visible ultraviolet (UV-Vis) absorption spectroscopy which is proportional to the amount of nanomaterial used and is influenced by pH conditions.

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