Effect of Al surface oxide structures on oxidability of Al-peroxymonosulfate system

Yang, Yang; Guo, Xiao-Han; Gai, Wei‐Zhuo; Deng, Zhen‐Yan

doi:10.1016/j.cej.2022.135923

Cited by 4 publications

(3 citation statements)

References 60 publications

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“…When the temperature increases, the reaction becomes fast so that the pH value in reaction solution increases more rapidly and the reaction time to reach the peak pH value decreases (Figure b). In fact, Al-water reaction will increase the pH value in aqueous solution as well due to part of its byproduct Al(OH) 3 dissolving into water . When the Al soaking time, reaction temperature, Al dosage, and nitrate concentration increase, the Al-water reaction will speed up and more hydroxide ions (OH – ) are generated, leading to an increase in peak pH value in aqueous solution (Figures b–b).…”

Section: Resultsmentioning

confidence: 99%

“…In fact, Al-water reaction will increase the pH value in aqueous solution as well due to part of its byproduct Al(OH) 3 dissolving into water. 65 When the Al soaking time, reaction temperature, Al dosage, and nitrate concentration increase, the Al-water reaction will speed up and more hydroxide ions (OH – ) are generated, leading to an increase in peak pH value in aqueous solution ( Figures 3 b– 6 b). It seems that the reaction kinetics of eq 9 just depends on temperature, because the reaction time to reach the peak pH value in aqueous solution is independent of Al soaking time, Al dosage, and nitrate concentration ( Figures 3 b, 5 b, and 6 b).…”

Section: Resultsmentioning

confidence: 99%

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Efficient Removal of Nitrate in Neutral Solution Using Zero-Valent Al Activated by Soaking

Dai

Guo

et al. 2023

ACS Omega

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Nitrate is a contaminant widely found in surface water, and a high concentration of nitrate can pose a serious threat to human health. Zero-valent iron is widely used to reduce nitrate in aqueous solution, but an acidic condition is required. Zero-valent aluminum has a much lower redox potential (E 0(Al3+/Al0) = −1.662 V) than zero-valent iron (E 0(Fe2+/Fe0) = −0.44 V), making it a better choice for reduction of nitrate. However, a passive oxide film covering on Al surfaces inhibits its electron transfer. In this work, metal Al powder was activated by a soaking procedure in deionized water. It was found that nitrate in neutral solution can be efficiently and completely reduced by soaked Al, even if the concentration of nitrate-N was up to 100 mg L–1. Using an optimal soaking time, the soaked Al can remove >90% of nitrate in aqueous solution within ∼2 h at 50 °C. Furthermore, the nitrate reduction efficiency increased with increasing reaction temperature and dosage of Al powder. After reaction, only ∼50% of pristine N content was left in the form of ammonia ions (NH4 +) in aqueous solution. Mechanism analyses showed that after soaking, Al particle surfaces were covered by a layer of loose and fine Al(OH)3 grains, which can shorten the induction time for the beginning of the reaction between inner Al and outside ions or molecules. This is the reason why soaked Al has a high efficiency for nitrate removal. The present results indicate that soaking is an effective way to activate Al to remove nitrate in water.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Efficient Removal of Nitrate in Neutral Solution Using Zero-Valent Al Activated by Soaking

Dai

Guo

et al. 2023

ACS Omega

Self Cite

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“…At present, Yang et al spheroidized the flake graphite with a carbon content of more than 98%, which was obtained by impact mechanical pulverizer and natural microcrystalline graphite with purity of 99% [4]. The results show that under the same speed and time, the aspect ratio of flake graphite is reduced by 32.75% and 48.94%, respectively, compared with that before spheroidization.…”

Section: Spheroidization Treatmentmentioning

confidence: 99%

Modification of graphite anode for lithium ion battery

Xia

2024

ACE

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Traditional fossil energy is being replaced by low-carbon clean energy, and lithium batteries have obtained extensive attention and are widely used for their high energy density and power density. Graphite is the most commonly used anode material for its excellent electrochemical performance. Since the theoretical lithium storage capacity of graphite is only 372 mAh/g, the lithium battery with graphite anode has problems such as poor electrolyte compatibility and a high volume expansion rate. Many researchers have devoted themselves to the modification of graphite anode to improve the comprehensive performance of graphite anode materials. This paper focuses on three main modification methods of graphite anodes. The application research progress of graphite modification on the improvement of lithium batteries performance was summarized from the aspects of spheroidization treatment, surface coating, and element doping. Spheroidization treatment and surface coating can effectively improve the electrochemical properties of the material interface, but it is difficult to increase the energy density of the material interface. Doping modification can improve energy density, but it cannot be uniform and stable. The modification and improvement technology of graphite anode still needs to be developed.

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Al-water reaction generates metastable aluminum cluster ions and their use in advanced oxidation processes

Guo,

Ma,

Wang

et al. 2024

Separation and Purification Technology

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Effect of Al surface oxide structures on oxidability of Al-peroxymonosulfate system

Cited by 4 publications

References 60 publications

Efficient Removal of Nitrate in Neutral Solution Using Zero-Valent Al Activated by Soaking

Efficient Removal of Nitrate in Neutral Solution Using Zero-Valent Al Activated by Soaking

Modification of graphite anode for lithium ion battery

Al-water reaction generates metastable aluminum cluster ions and their use in advanced oxidation processes

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