UV-Enhanced NaClO Oxidation of Nitric Oxide from Simulated Flue Gas

Yang, Shunkun; Han, Zhitao; Dong, Jingming; Zheng, Zi-sheng; Pan, Xinxiang

doi:10.1155/2016/6065019

Cited by 11 publications

(14 citation statements)

References 30 publications

(46 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is because the increase in the concentration of (NaOCl) would enhance the frequency of collision between oxidizing substances and dye molecules, which is consistent with the results of researchers Xu et al, [29], and Amit, et al, [30]. In addition, increasing the concentration of (NaOCl) increases the obtaining of hydroxyl radicals in the solution effectively, as shown in the following equations [31]:…”

Section: Effects Of Concentrationsupporting

confidence: 85%

“…It was noticed that increasing the temperature from 20 to 50 degrees Celsius, the removal efficiency increased from 94.64% to 97.32% because the increase in temperature led to increased mass transfer, this improves the efficiency of removal [32][33][34]. In the presence of ultraviolet rays, the removal percentage increased from 96.9% to 99.01% because the rays provide several photons needed, which can break the bonds in the dye [31].…”

Section: Effects Of Temperaturementioning

confidence: 99%

See 1 more Smart Citation

Removing The Acid Orange 12 Azo Dye from Aqueous Solution Using Sodium Hypochlorite, A Kinetic and Thermodynamic Study

Hameed

Dekhyl

Alabdraba

2022

IOP Conf. Ser.: Earth Environ. Sci.

View full text Add to dashboard Cite

This study investigated the feasibility of using sodium hypochlorite as an advanced oxidation process to remove Acid Orange 12 azo dye from wastewater. For this purpose, batch reactor experiments were done. Several variables to address the efficiency of using this process were considered. These variables are initial pH (5, 7, and 9), the concentration of hypochlorite (50 – 250 mg/l), temperature (20-50) degrees Celsius, and time of electrolysis (1-75) min. also investigate the effects of UV on the process was done. Experimental results showed that the color removal efficiency using NaOCl with UV is more effective than NaOCl alone. The highest removal efficiency was obtained by increasing the concentration of NaOCl from (50-250mg/l) at PH=5. When the solution temperature was increased from (20-50) °C, the removal efficiency increased, and at the same time, the time required was reduced from (20-5) minutes to obtain the highest removal efficiency. The kinetic study also showed that the oxidation process follows a second-order reaction. The thermodynamic functions indicate that the response is spontaneous, endothermic, and increases randomness.

show abstract

Section: Effects Of Concentrationsupporting

confidence: 85%

Section: Effects Of Temperaturementioning

confidence: 99%

Removing The Acid Orange 12 Azo Dye from Aqueous Solution Using Sodium Hypochlorite, A Kinetic and Thermodynamic Study

Hameed

Dekhyl

Alabdraba

2022

IOP Conf. Ser.: Earth Environ. Sci.

View full text Add to dashboard Cite

show abstract

“…Although the mechanism of graphene degradation by NaClO assisted by UV irradiation is not fully understood, it is known that UV light accelerates the deposition of NaClO to generate photooxidants, such as HO ∙ , O ∙ − , and Cl, which possess very strong oxidation ability 33 . These oxidants react rapidly with graphene, as occurs in water treatment 34 and the purification of fuel gas 35 . The complete oxidation of graphene by NaClO is believed to follow the general reaction formula C graphene + 2NaClO → 2NaCl + CO 2 , similar to CNTs 23 .…”

Section: Discussionmentioning

confidence: 99%

Patterning of graphene using wet etching with hypochlorite and UV light

Zhang

Yang

Okigawa

et al. 2022

Sci Rep

View full text Add to dashboard Cite

Graphene patterning via etching is important for enhancing or controling the properties of devices and supporting their applications in micro- and nano-electronic fields. Herein, we present a simple, low-cost, and scalable wet etching method for graphene patterning. The technique uses hypochlorite solution combined with ultraviolet light irradiation to rapidly remove unwanted graphene areas from the substrate. Raman spectroscopy, atomic force microscopy, scanning electron microscopy, and optical microscopy results showed that well-patterned graphene with micrometer scale regions was successfully prepared. Furthermore, graphene field effect transistor arrays were fabricated, and the obtained devices exhibited good current–voltage characteristics, with maximum mobility of ~ 1600 cm2/Vs, confirming the feasibility of the developed technique.

show abstract

“…Since a part of the generated NO 2 had not been absorbed by the scrubbing solution, NO x removal efficiency was obviously lower than the corresponding NO removal efficiency. It was reported in a previous study that an acidic or a basic condition was favorable for NO removal by wet scrubbing using a NaClO solution, because HClO was considered as the effective oxidant among the active chlorine species [36,37]. However, for the ultrasonic atomization process, the effect of the initial pH of NaClO solution on the NO removal efficiency was quite different from that for the wet scrubbing process.…”

Section: Comparison Of Different Oxidants In Mistmentioning

confidence: 94%

NO Removal from Simulated Flue Gas with a NaClO2 Mist Generated Using the Ultrasonic Atomization Method

et al. 2018

View full text Add to dashboard Cite

In order to enhance the mass transfer efficiency between gas-liquid interfaces, NaClO 2 mist generated by an ultrasonic humidifier was used to remove NO from simulated flue gas. The effects of some key parameters (the gas flow rate, the NaClO 2 concentration in the solution, the inlet NO concentration, the NaClO 2 solution pH) on NO removal efficiency were investigated preliminarily. The results showed that NaClO 2 mist could oxidize NO with a much higher efficiency compared with other mists containing either NaClO or H 2 O 2 as oxidants. With an increase in the gas flow rate from 1.5 to 3.0 L·min −1 , the atomizing rate of the NaClO 2 solution increased almost linearly from 0.38 to 0.85 mL·min −1 . When the gas flow rate was 2.0 L·min −1 , a complete removal of NO had been reached. NO removal efficiency increased obviously with an increase in the NaClO 2 concentration in the solution. With an increase in the inlet NO concentration, the ratio of NO in the flue gas and NaClO 2 in the mist increased almost linearly. Furthermore, the NaClO 2 mist exhibited a relatively stable and high NO x removal efficiency in a wide pH range (4-11) of NaClO 2 solutions. The reason for the high NO removal efficiency was mainly ascribed to both the strong oxidative ability of NaClO 2 and the improved mass transfer at the gas-liquid interface.Energies 2018, 11, 1043 2 of 15 system to avoid ammonia slip. For SNCR, its NO x removal efficiency is obviously lower than that of SCR. Furthermore, a very high reaction temperature of 850-1100 • C is essential for SNCR to facilitate the reduction reaction between NO x and the reductants [10]. Since both SCR and SNCR belong to the dry methods for NO removal, they have to be combined in series with a wet scrubbing desulfurization process for the simultaneous removal of NO x and SO 2 . Such an integrated system suffers from some obvious drawbacks, such as the high cost, large size, complicated operation, and so on. To a great extent, these factors limit the application of the integrated system in some industrial areas.In recent years, more and more researchers have been interested in developing new methods for the simultaneous removal of NO x and SO 2 based on wet scrubbing processes [11]. In such cases, appropriate additives are required to improve the water solubility of NO x . A number of reports have suggested NO removal with the help of an iron chelating agent such as Fe 2+ -EDTA (Ethylene Diamine Tetraacetic Acid) because of its fast absorption rate for NO and high absorption capacity. However, the chelating agent could be easily oxidized by NO, NO 2 , and O 2 in flue gas to form Fe 3+ -EDTA that is not capable of binding with NO [12]. It also needs to overcome other main drawbacks such as the high cost of EDTA, and the need to remove the N-S complex [13]. Another possible way is to oxidize the insoluble NO into soluble NO 2 , and then the NO x molecules can be absorbed through wet scrubbing using the proper absorbents [14]. Although both nonthermal plasma and ozone can be used as excellent...

show abstract

UV-Enhanced NaClO Oxidation of Nitric Oxide from Simulated Flue Gas

Cited by 11 publications

References 30 publications

Removing The Acid Orange 12 Azo Dye from Aqueous Solution Using Sodium Hypochlorite, A Kinetic and Thermodynamic Study

Removing The Acid Orange 12 Azo Dye from Aqueous Solution Using Sodium Hypochlorite, A Kinetic and Thermodynamic Study

Patterning of graphene using wet etching with hypochlorite and UV light

NO Removal from Simulated Flue Gas with a NaClO2 Mist Generated Using the Ultrasonic Atomization Method

Contact Info

Product

Resources

About