Nanoscale iron (oxyhydr)oxide-modified carbon nanotube filter for rapid and effective Sb(<scp>iii</scp>) removal

Liu, Yanbiao; Yao, Jinyu; Liu, Fuqiang; Shen, Chensi; Li, Fang; Yang, Bo; Huang, Manhong; Sand, Wolfgang

doi:10.1039/c9ra02988e

Cited by 15 publications

(2 citation statements)

References 37 publications

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“…For example, at neutral pH, the negatively charged nano-TiO 2 -CNT membrane (pH zpc 4.5) should repel the Sb V (OH) 6 – ; however, the anodic membrane charging and applied electric field enhance Sb(V) removal by electrosorption and electromigration, respectively. The TiO 2 nanoparticles can be substituted by alternative nanoscale Sb-specific sorbents (e.g., titanate nanowires and iron oxides) resulting in a similar performance, indicating the desired sorptive structural aspects and electroactivity of the original TiO 2 -CNT are both retained in these alternative materials.…”

Section: Environmental Applications Of Electroactive Carbon Nanotube ...mentioning

confidence: 99%

Prospects of an Electroactive Carbon Nanotube Membrane toward Environmental Applications

2020

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Metrics & MoreArticle Recommendations * sı Supporting Information CONSPECTUS: Rapid population growth and industrialization have driven the emergence of advanced electrochemical and membrane technologies for environmental and energy applications. Electrochemical processes have potential for chemical transformations, chloralkali disinfection, and energy storage. Membrane separations have potential for gas, fluid, and chemical purification. Electrochemical and membrane technologies are often used additively in the same unit process, e.g., the chloroalkali process where a membrane is used to separate cathodic and anodic products from scavenging each other. However, to access the maximal potential requires intimate hybridization of the two technologies into an electroactive membrane. The combination of the two discrete technologies results in a range of synergisms such as reduced footprint, increased processing kinetics, reduced fouling, and increased energy efficiency. Due to their high specific surface area, excellent electric conductivity, and desirable robustness, 1D carbon nanotubes (CNTs) hold promise for many applications over a range of industry sectors such as a base material for electrodes and membranes. Importantly, CNT morphology and surface chemistry can be rationally modified and fine-tuning of these CNT physicochemical properties can enhance their functionality toward practical applications. The CNT 1D form allows assembly of a stable thin-film fibrous network by a variety of facile techniques. These CNT networks have pore sizes in the range of 10−500 nm (d pore ∼ 6−8d CNT ) and thicknesses of 10−200 μm, both similar to those of classical polymer membranes, thus allowing for straightforward incorporation into commercial membrane devices modified for electroactivity inclusion.In this Account, CNTs and their composites are used as model electroactive porous materials to exemplify the design strategies and environmental applications of emerging electroactive membrane technology. The Account begins with a brief summary of the electroactive membrane design principles and flow processes developed by our groups. After the methodology section, a detailed discussion is provided on the underlying physical-chemical mechanisms that govern the electroactive membrane technology. Then we summarize our findings on the rational design of several flow-through electrochemical CNT filtration systems focused on either anodic oxidation reactions or cathodic reduction reactions. Subsequently, we discuss a recently discovered electrochemical valencestate-regulation strategy that is capable to detoxify and sequester heavy metal ions. Finally, we conclude the Account with our perspectives toward future development of the electroactive membrane technology.

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Section: Environmental Applications Of Electroactive Carbon Nanotube ...mentioning

confidence: 99%

Prospects of an Electroactive Carbon Nanotube Membrane toward Environmental Applications

2020

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“…Centrifuge tubes were shaken at 100 rpm/min for 10 days at room temperature (25 ± 1 °C) in an incubator shaker. Based on the earlier sorption studies of Sb to Fe-based materials, 10 days reaction time was sufficient to reach equilibrium [ 15 , 41 ]. All experiments were performed in triplicate.…”

Section: Methodsmentioning

confidence: 99%

Antimony Immobilization in Primary-Explosives-Contaminated Soils by Fe–Al-Based Amendments

Wang

Jiang

Xia

et al. 2022

IJERPH

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Soils at primary explosives sites have been contaminated by high concentrations of antimony (Sb) and co-occurring heavy metals (Cu and Zn), and are largely overlooked and neglected. In this study, we investigated Sb concentrations and species and studied the effect of combined Fe- and Fe–Al-based sorbent application on the mobility of Sb and co-occurring metals. The content of Sb in soil samples varied from 26.7 to 4255.0 mg/kg. In batch experiments, FeSO4 showed ideal Sb sorption (up to 97% sorption with 10% FeSO4·7H2O), whereas the sorptions of 10% Fe0 and 10% goethite were 72% and 41%, respectively. However, Fe-based sorbents enhanced the mobility of co-occurring Cu and Zn to varying levels, especially FeSO4·7H2O. Al(OH)3 was required to prevent Cu and Zn mobilization. In this study, 5% FeSO4·7H2O and 4% Al(OH)3 mixed with soil was the optimal combination to solve this problem, with Sb, Zn, and Cu stabilizations of 94.6%, 74.2%, and 82.2%, respectively. Column tests spiked with 5% FeSO4·7H2O, and 4% Al(OH)3 showed significant Sb (85.85%), Zn (83.9%), and Cu (94.8%) retention. The pH-regulated results indicated that acid conditioning improved Sb retention under alkaline conditions. However, no significant difference was found between the acidification sets and those without pH regulation. The experimental results showed that 5% FeSO4·7H2O + 4% Al(OH)3 without pH regulation was effective for the stabilization of Sb and co-occurring metals in primary explosive soils.

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Decontamination of Aqueous Heavy Metal Ions by Valence Regulation Strategy

Guo

Liu

et al. 2020

Removal of Emerging Contaminants Through Microbial Processes

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Nanoscale iron (oxyhydr)oxide-modified carbon nanotube filter for rapid and effective Sb(iii) removal

Abstract: Herein, nanoscale iron (oxyhydr)oxide-coated carbon nanotube (CNT) filters were rationally designed for rapid and effective removal of Sb(iii) from water.

Cited by 15 publications

References 37 publications

Prospects of an Electroactive Carbon Nanotube Membrane toward Environmental Applications

Prospects of an Electroactive Carbon Nanotube Membrane toward Environmental Applications

Antimony Immobilization in Primary-Explosives-Contaminated Soils by Fe–Al-Based Amendments

Decontamination of Aqueous Heavy Metal Ions by Valence Regulation Strategy

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