Preparation of palladized carbon nanotubes encapsulated iron composites: highly efficient dechlorination for trichloroethylene and low corrosion of nanoiron

A method developed based on the capillary effect and capillary condensation theory was used to synthesize an innovative Fe/C/Pd composite in this study. This composite (Fe@CNTs@Pd) consists of carbon nanotubes (CNTs) with nanoscale zerovalent iron (NZVI) on the inner surface and palladium nanoparticles supported on the outer surface of CNTs. This structure successfully addresses the problems of high iron corrosion rate and lower utilization rate of hydrogen in the application of bimetal nanoparticles for trichloroethylene (TCE) removal. TCE degradation experiments and electrochemical tests were conducted to investigate the material properties and reaction mechanisms of the composite. It is found that the prepared composite material contribute a high level of TCE dechlorination rate and substantially reduced hydrogen production during iron corrosion in water compared with the conventional CNTs-supported bimetal materials (Fe/Pd@CNTs). Hydrogen spillover effect helps the reactivity of Fe@CNTs@Pd for TCE degradation and suppressed the galvanic cell effect, which results in a stronger resistance to corrosion. Although the K obs of Fe@CNTs@Pd was 16.87% lower than that of Fe/Pd@CNTs, the hydrogen production rate of Fe@CNTs@Pd was 10 times slower than that of Fe/Pd@CNTs. Therefore, Fe@CNTs@Pd shows a significant reduction in the corrosion rate at a cost of slightly slower degradation of TCE. In sum, the prepared composites demonstrate important characteristics, including alleviating NZVI agglomeration, maintaining high TCE removal efficiency and reducing the corrosion of NZVI.

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Nanoscale zerovalent iron, carbon nanotubes and biochar facilitated the phytoremediation of cadmium contaminated sediments by changing cadmium fractions, sediments properties and bacterial community structure

Ecotoxicology and Environmental Safety ◽

10.1016/j.ecoenv.2020.111510 ◽

2021 ◽

Vol 208 ◽

pp. 111510

Author(s):

Xiaomin Gong ◽

Danlian Huang ◽

Yunguo Liu ◽

Dongsheng Zou ◽

Xi Hu ◽

...

Keyword(s):

Carbon Nanotubes ◽

Community Structure ◽

Bacterial Community ◽

Bacterial Community Structure ◽

Contaminated Sediments ◽

Zerovalent Iron ◽

Nanoscale Zerovalent Iron

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Effects of changes in operating conditions on the iron corrosion rate in zerovalent iron columns

Arsenic in the Environment - Proceedings - One Century of the Discovery of Arsenicosis in Latin America (1914-2014) As2014 ◽

10.1201/b16767-252 ◽

2014 ◽

pp. 675-677 ◽

Cited By ~ 1

Author(s):

E Berardozzi ◽

J Galindez ◽

F Einschlag

Keyword(s):

Corrosion Rate ◽

Operating Conditions ◽

Zerovalent Iron ◽

Iron Corrosion

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Degradation of nitrobenzene-containing wastewater by carbon nanotubes immobilized nanoscale zerovalent iron

Journal of Nanoparticle Research ◽

10.1007/s11051-016-3512-0 ◽

2016 ◽

Vol 18 (7) ◽

Cited By ~ 8

Author(s):

Weizhou Jiao ◽

Zhirong Feng ◽

Youzhi Liu ◽

Huihui Jiang

Keyword(s):

Carbon Nanotubes ◽

Zerovalent Iron ◽

Nanoscale Zerovalent Iron

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Corrosion rate estimations of microscale zerovalent iron particles via direct hydrogen production measurements

Journal of Hazardous Materials ◽

10.1016/j.jhazmat.2014.01.034 ◽

2014 ◽

Vol 270 ◽

pp. 18-26 ◽

Cited By ~ 39

Author(s):

Milica Velimirovic ◽

Luca Carniato ◽

Queenie Simons ◽

Gerrit Schoups ◽

Piet Seuntjens ◽

...

Keyword(s):

Hydrogen Production ◽

Corrosion Rate ◽

Zerovalent Iron ◽

Iron Particles

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Water treatment to reduce internal corrosion in the drinking water distribution system in Oslo

Water Science & Technology Water Supply ◽

10.2166/ws.2001.0056 ◽

2001 ◽

Vol 1 (3) ◽

pp. 91-96 ◽

Cited By ~ 1

Author(s):

L.J. Hem ◽

E.A. Vik ◽

A. Bjørnson-Langen

Keyword(s):

Water Treatment ◽

Corrosion Rate ◽

Distribution System ◽

Water Distribution ◽

Treatment Plant ◽

Water Treatment Plant ◽

Corrosion Monitoring ◽

Copper Corrosion ◽

Iron Corrosion ◽

Internal Corrosion

In 1995 the new Skullerud water treatment plant was put into operation. The new water treatment includes colour removal and corrosion control with an increase of pH, alkalinity and calcium concentration in addition to the old treatment, which included straining and chlorination only. Comparative measurements of internal corrosion were conducted before and after the installation of the new treatment plant. The effect of the new water treatment on the internal corrosion was approximately a 20% reduction in iron corrosion and a 70% reduction in copper corrosion. The heavy metals content in standing water was reduced by approximately 90%. A separate internal corrosion monitoring programme was conducted, studying the effects of other water qualities on the internal corrosion rate. Corrosion coupons were exposed to the different water qualities for nine months. The results showed that the best protection of iron was achieved with water supersaturated with calcium carbonate. Neither a high content of free carbon dioxide or the use of the corrosion inhibitor sodium silicate significantly reduced the iron corrosion rate compared to the present treated water quality. The copper corrosion rate was mainly related to the pH in the water.

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Designing of a nanoscale zerovalent iron@fly ash composite as efficient and sustainable adsorbents for hexavalent chromium (Cr(VI)) from water

Environmental Science and Pollution Research ◽

10.1007/s11356-020-11692-1 ◽

2021 ◽

Author(s):

Shubhangi Madan ◽

Urvashi Thapa ◽

Sangeeta Tiwari ◽

Sandeep Kumar Tiwari ◽

Suresh Kumar Jakka ◽

...

Keyword(s):

Fly Ash ◽

Hexavalent Chromium ◽

Zerovalent Iron ◽

Nanoscale Zerovalent Iron

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Removal of hexavalent chromium from wastewater by Cu/Fe bimetallic nanoparticles

Scientific Reports ◽

10.1038/s41598-021-90414-0 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Jien Ye ◽

Yi Wang ◽

Qiao Xu ◽

Hanxin Wu ◽

Jianhao Tong ◽

...

Keyword(s):

Hexavalent Chromium ◽

Removal Efficiency ◽

Photoelectron Spectroscopy ◽

Bimetallic Nanoparticles ◽

Chemical Reduction ◽

Particle Surface ◽

Zerovalent Iron ◽

Order Model ◽

X Ray ◽

Nanoscale Zerovalent Iron

AbstractPassivation of nanoscale zerovalent iron hinders its efficiency in water treatment, and loading another catalytic metal has been found to improve the efficiency significantly. In this study, Cu/Fe bimetallic nanoparticles were prepared by liquid-phase chemical reduction for removal of hexavalent chromium (Cr(VI)) from wastewater. Synthesized bimetallic nanoparticles were characterized by transmission electron microscopy, Brunauer–Emmet–Teller isotherm, and X-ray diffraction. The results showed that Cu loading can significantly enhance the removal efficiency of Cr(VI) by 29.3% to 84.0%, and the optimal Cu loading rate was 3% (wt%). The removal efficiency decreased with increasing initial pH and Cr(VI) concentration. The removal of Cr(VI) was better fitted by pseudo-second-order model than pseudo-first-order model. Thermodynamic analysis revealed that the Cr(VI) removal was spontaneous and endothermic, and the increase of reaction temperature facilitated the process. X-ray photoelectron spectroscopy (XPS) analysis indicated that Cr(VI) was completely reduced to Cr(III) and precipitated on the particle surface as hydroxylated Cr(OH)3 and CrxFe1−x(OH)3 coprecipitation. Our work could be beneficial for the application of iron-based nanomaterials in remediation of wastewater.

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