A new carbon nanotube modified by nano CaO2 for removal of chromate and phosphate from aqueous solutions

Chen, Zhihao; Fu, Dewang; Koh, Kok Yuen; Chen, J. Paul

doi:10.1016/j.cej.2022.136845

Cited by 7 publications

(3 citation statements)

References 64 publications

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“…In recent years, solid metal peroxides that can replace H2O2, such as CaO2, ZnO2, MgO2, and lanthanum peroxide, have gradually gained attention due to their excellent oxidizing properties (Uppal et al, 2016;Song et al, 2020). In particular, CaO2 has been widely explored because of its simple preparation, lower cost, environmental friendliness, and excellent performance (Chen et al, 2022). Chen et al (2021) devised a Fe(III)/CaO2 method to purify As(III), accomplishing the simultaneous process of oxidizing and adsorbing with efficiencies of 100.0% and 95.8%, respectively.…”

Section: Introductionmentioning

confidence: 99%

Synergistic oxidation and adsorption of As(III) in water using biochar-mediated Fe(II)/nano-CaO2 system

Lv,

Zuo,

et al. 2024

Preprint

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Due to its mobility and high toxicity, As(III) can easily migrate and accumulate through the food chain, endangering human health. The common treatment method for As(III) is a combination of oxidation and adsorption, in which the Fenton-like method exhibits a prominent removal performance. Based on our previous work, the Fe(II)/nano-CaO2/biochar Fenton-like system with excellent oxidizing and adsorption capabilities was used to remove As(III) from water. Compared to the common oxidation systems, the Fe(II)/nano-CaO2/RBC system showed an excellent As(III) removal through simultaneous oxidation and adsorption. The research findings demonstrated that under the cooperative effects of Fe(II) hydrolysis and RBC catalysis, As(III) in water could be efficiently removed in a broad initial 3.0–10.0 pH range, which solved the challenge of pH elevation that other metal peroxide systems encountered. In this system, most of the common co-existing cations and anions had no discernible impact on the As(III) elimination process, and some of the humic acid (HA) (< 60 mg L− 1) was mineralized simultaneously. Quenching and characterization experiments confirmed that •OH dominated the oxidation of As(III), and •OH production was boosted by the addition of RBC. The purification of oxidized As(V) from water can be achieved by binding it with Fe and Ca through the synthetic action of electrostatic adsorption, surface complexation, and co-precipitation. Overall, this work presents an alternative approach for effectively eliminating As(III) from water.

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Section: Introductionmentioning

confidence: 99%

Synergistic oxidation and adsorption of As(III) in water using biochar-mediated Fe(II)/nano-CaO2 system

Lv,

Zuo,

et al. 2024

Preprint

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show abstract

“…4 Increasingly stringent emission requirements have challenged conventional phosphate elimination methods such as biodegradation, physical removal, and chemical precipitation, because these traditional approaches still suffer from insufficient removal efficiency, excessive use of chemicals, and heavy energy consumption. [5][6][7] Therefore, the removal of phosphate is still faced with tremendous challenges. Electro-assisted adsorption has attracted increasing attention due to its distinct benets such as efficient performance, rapid reaction, and environmental friendliness, making it a promising technology for pollutants elimination.…”

Section: Introductionmentioning

confidence: 99%

Engineering bimetallic capture sites on hierarchically porous carbon electrode for efficient phosphate electrosorption: multiple active centers and excellent electrochemical properties

Zhang

et al. 2023

J. Mater. Chem. A

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“…Adsorption using adsorbents is a promising method because it has been reported to have high efficiency, a simple operating design, low-cost implementation, and it enables the removal of substances even at extremely low concentrations [14][15][16][17]. Various adsorbents have been developed or improved for selective adsorption of heavy metal ions in wastewater, such as polymer/metallic composites [18], zeolites and silica-based materials [19][20][21][22][23][24], carbon nanotubes [25], and activated carbon that was used in lab-scale tests [26] or was effectively adopted in water treatment innovation, namely, in a passive in-situ treatment system [27]. In addition to the synthetic adsorbents, natural biomass [28] and agricultural wastes [29] were also used as biosorbents to adsorb metal ions.…”

Section: Introductionmentioning

confidence: 99%

Amine-Modified Small Pore Mesoporous Silica as Potential Adsorbent for Zn Removal from Plating Wastewater

et al. 2022

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The removal of Zn from wastewater generated from the Zn-based electroplating manufacturing process is essential because the regulation limit of Zn concentration in wastewater is becoming stricter in Japan. However, achieving this through conventional methods is difficult, especially for small and medium enterprises in the plating industry. Therefore, a suitable Zn-removal method with a low cost but high performance and Zn selectivity is required. The application of adsorbents is one possible solution. Mesoporous silica (MS) is a well-known adsorbent with controllable pore size, high specific surface area (SSA), high acid resistance, and ease of surface modification. In this study, we modified the surfaces of MSs with different initial pore sizes by amino groups and investigated their Zn removal performances. The effect of pore size on amine modification using (3-aminopropyl)triethoxysilane and on adsorption performance in a single system was investigated along with Zn adsorption selectivity in the Zn–Ni binary system. Amine-modified MS prepared from MS with an initial pore size of 1.9 nm showed drastically lower performance compared to those prepared from MS with an initial pore size larger than 2.8 nm. Zn-selectivity in the Zn–Ni binary system, containing equal amounts of Zn and Ni, was found to reach a maximum of 21.6 when modifying MS with an initial pore size of 2.8 nm.

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A new carbon nanotube modified by nano CaO2 for removal of chromate and phosphate from aqueous solutions

Cited by 7 publications

References 64 publications

Synergistic oxidation and adsorption of As(III) in water using biochar-mediated Fe(II)/nano-CaO2 system

Synergistic oxidation and adsorption of As(III) in water using biochar-mediated Fe(II)/nano-CaO2 system

Engineering bimetallic capture sites on hierarchically porous carbon electrode for efficient phosphate electrosorption: multiple active centers and excellent electrochemical properties

Amine-Modified Small Pore Mesoporous Silica as Potential Adsorbent for Zn Removal from Plating Wastewater

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