A novel method of ultraviolet/NaClO2-NH4OH for NO removal: Mechanism and kinetics

Hao, Runlong; Mao, Xinhua; Wang, Zheng; Zhao, Yi; Wang, Tianhao; Sun, Zhonghao; Yuan, Bo; Li, Yankun

doi:10.1016/j.jhazmat.2019.01.042

Cited by 92 publications

(24 citation statements)

References 30 publications

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“…EPR and radical quenching experiments were carried out to identify the main active substances for ammonia conversion. As shown in Figure 2a, the signal of DMPO-ClO• was detected in the presence of [Cl − ] [28,29]. A four-line characteristic DMPO−OH• signal with 1:2:2:1 intensity was observed, and other faint peaks may correspond to Cl• [30].…”

Section: Ammonia Decontamination Mechanismmentioning

confidence: 90%

A Bifunctional Electroactive Ti4O7-Based Membrane System for Highly Efficient Ammonia Decontamination

et al. 2020

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Herein, an electroactive filtration system, consisting of a Ti4O7 anode and a Pd-Cu co-modified nickel foam cathode, was developed and applied for the decontamination of ammonia from water. When assisted with an external electrical field, ClO• was generated on the surface of the Ti4O7 anode, which then reacted selectively with ammonia to generate N2. The anodic byproduct, NO3−, could also be reduced efficiently at the functional cathode to produce N2 as well. Electron paramagnetic resonance technique and radical scavenging tests synergistically verified the essential role of ClO• during the highly efficient ammonia conversion process. Relative to conventional batch systems, the developed flow-through design demonstrated enhanced ammonia conversion kinetics, thanks to the convection-enhanced mass transport. The proposed technology also showed desirable stability across a wide environmental matrix. This work provides new insights for the development of advanced and affordable continuous-flow systems towards effective decontamination of ammonia.

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Section: Ammonia Decontamination Mechanismmentioning

confidence: 90%

A Bifunctional Electroactive Ti4O7-Based Membrane System for Highly Efficient Ammonia Decontamination

et al. 2020

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“…The liquid-phase oxidation absorption method is that NO is oxidized by liquid phase oxidant and then absorbed by alkali absorption method. The de-NO x rate can reach 90-95% when using KMnO 4 or NaClO 2 as liquid phase oxidizers [89]. NaClO 2 has strong oxidizing property; its solution can oxidize NO to NO 2 , and then NaNO 3 was obtained.…”

Section: No X Removed By Liquid-phase Oxidationmentioning

confidence: 99%

A Critical Review of Recent Progress and Perspective in Practical Denitration Application

Liu

et al. 2019

Catalysts

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Nitrogen oxides (NO x ) represent one of the main sources of haze and pollution of the atmosphere as well as the causes of photochemical smog and acid rain. Furthermore, it poses a serious threat to human health. With the increasing emission of NO x , it is urgent to control NO x . According to the different mechanisms of NO x removal methods, this paper elaborated on the adsorption method represented by activated carbon adsorption, analyzed the oxidation method represented by Fenton oxidation, discussed the reduction method represented by selective catalytic reduction, and summarized the plasma method represented by plasma-modified catalyst to remove NO x . At the same time, the current research status and existing problems of different NO x removal technologies were revealed and the future development prospects were forecasted.Catalysts 2019, 9, 771 2 of 39 adsorption, oxidation, reduction, and plasma methods. In view of these attentive findings, adsorption method uses recyclable solid adsorbent material to adsorb NO x from flue gas through microporous structure, remarkably, environmentally friendly, no secondary pollution, and energy-saving and -efficient features make it stand out [18][19][20]. The oxidation process is a method that oxidizes NO into NO 2 or N 2 O 3 with high solubility under the action of an oxidant that is then absorbed by water or alkali solution. The process is simple and cost-saving, and is widely used in the wet flue gas denitrification process with relatively low cost and high removal efficiency of NO x ; except that the oxidized NO and SO 2 can be removed simultaneously to produce high value-added products [21][22][23]. The reduction method has the characteristics of high efficiency, cleanliness, and mildness; NO x removal can be realized at low temperature at present [24][25][26]. The plasma method is used to modify the surface of the catalyst, the dispersion of active species can be improved by plasma treatment, and the stability and low temperature activity of catalyst can be improved [27,28].Seldom, if ever, does a comprehensive article to introduce the current situation and treatment methods of removing NO x . In this paper, we tried to renovate, classify, and summarize the significant perspectives and most relevant findings reported in recent research articles and earlier reviews generalizing the mechanism analysis and research progress of NO x removal by adsorption, oxidation, reduction, and plasma methods, which can provide means for promoting the technological progress of pollution prevention, maintaining healthy development of factories continuously, studying the methods of removing NO x deeply, and mastering different technologies of removing NO x , as well as providing guidance for controlling the emission of NO x from motor vehicles such as diesel, gasoline, and so on. In order to improve the environmental quality and save the ecological environment, this paper further provides a convenient, low-cost, efficient, and economic guidance line.

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“…In addition, the dominant active species ClO2 plays an important role in NO removal, therefore, to further understand the mechanisms of NO removal, more experiments were performed to measure the concentration of ClO2 in solution by a UV-Vis spectrophotometer (shown in Figure 9). The concentration of ClO2 was determined at a wavelength of 360 nm [21,32], and the height of the peak was directly proportional to the concentration of ClO2. The peak of 260 nm was assigned to ClO2 − [28].…”

Section: Effect Of Initial Ph On the No Removal Efficiencymentioning

confidence: 99%

Promoting Effect of H+ and Other Factors on NO Removal by Using Acidic NaClO2 Solution

Gong

2019

Energies

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In this study, NaClO2 was selected as a denitration oxidant. In order to clarify the mechanism of NaClO2 as an oxidation agent for NO removal efficiency, the effects of H+ and other factors (NaClO2 concentration, temperature, and the other gas) on the NO removal efficiency were investigated. NaClO2 showed a promotional ability on NO removal, whose efficiency increased with the increase of NaClO2 concentration. One hundred percent removal efficiency of NO could be achieved when the NaClO2 concentration was 0.014 mol/L. Furthermore, raising the reaction temperature benefited the removal of NO. The lower the pH, the better the NO removal efficiency. The promoting effect of H+ on the NO removal was studied by the Nernst equation, ionic polarization, and the generation of ClO2. Under the optimal conditions, the best removal efficiency of NO was 100%. Based on the experimental results, the reaction mechanism was finally speculated.

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A novel method of ultraviolet/NaClO2-NH4OH for NO removal: Mechanism and kinetics

Cited by 92 publications

References 30 publications

A Bifunctional Electroactive Ti4O7-Based Membrane System for Highly Efficient Ammonia Decontamination

A Bifunctional Electroactive Ti4O7-Based Membrane System for Highly Efficient Ammonia Decontamination

A Critical Review of Recent Progress and Perspective in Practical Denitration Application

Promoting Effect of H+ and Other Factors on NO Removal by Using Acidic NaClO2 Solution

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