Kinetic Study of Humic Acid Ozonation in Aqueous Media

Miao, Hengfeng; Tao, Wenyi; Cui, Fengjie; Xu, Zhenghong; Ao, Zong-Hua

doi:10.1002/clen.200800025

Cited by 12 publications

(5 citation statements)

References 32 publications

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“…Tert-BuOH was found to be practically inert toward ozone (kO 3 = 3 × 10 -3 M -1 s -1 ), while it acts as an OH• scavenger (kOH ≤ 6 × 10 8 M -1 s -1 ) and inhibits the chain reaction between radicals and HAs. Additionally, 50, 100, and 250 mL L -1 of TBA was added to the aqueous solutions to extinguish OH• for the investigation of reaction rates of the HA ozonation direct pathway [44]. The DOC amount which is composed of TBA was eliminated in the DOC analyzes.…”

Section: Methodsmentioning

confidence: 99%

Catalytic Ozonation by Iron Coated Pumice for the Degradation of Natural Organic Matters

Alver

Kılıç

2018

Catalysts

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The use of iron-coated pumice (ICP) in heterogeneous catalytic ozonation significantly enhanced the removal efficiency of natural organic matters (NOMs) in water, due to the synergistic effect of hybrid processes when compared to sole ozonation and adsorption. Multiple characterization analyses (BET, TEM, XRD, DLS, FT-IR, and pH PZC ) were employed for a systematic investigation of the catalyst surface properties. This analysis indicated that the ICP crystal structure was α-FeOOH, the surface hydroxyl group of ICP was significantly increased after coating, the particle size of ICP was about 200-250 nm, the BET surface area of ICP was about 10.56 m 2 g −1 , the pH PZC value of ICP was about 7.13, and that enhancement by iron loading was observed in the FT-IR spectra. The contribution of surface adsorption, hydroxyl radicals, and sole ozonation to catalytic ozonation was determined as 21.29%, 66.22%, and 12.49%, respectively. The reaction kinetic analysis with tert-Butyl alcohol (TBA) was used as a radical scavenger, confirming that surface ferrous iron loading promoted the role of the hydroxyl radicals. The phosphate was used as an inorganic probe, and significantly inhibited the removal efficiency of catalytic NOM ozonation. This is an indication that the reactions which occur are more dominant in the solution phase.

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Section: Methodsmentioning

confidence: 99%

Catalytic Ozonation by Iron Coated Pumice for the Degradation of Natural Organic Matters

Alver

Kılıç

2018

Catalysts

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“…[14] Ozone and the hydrophobic DOM reacted in two pathways (ozone and hydroxyl radical (OH • )), which resulted in the formation of the hydrophilic DOM fractions. [14,32,41,42] These OH • radicals react with all DOM fractions quickly, converting aromatic compounds and double bonds into hydrophilic DOM such as aldehydes, alcohols, and carboxylic acids. [33,41] Ozone, on the other hand, is more reactive with functional groups that are electron-rich, such as activated aromatic structures and unsaturated hydrocarbon bonds.…”

Section: Effects Of Microbubble Pre-ozonation On Dom Fractions Formationmentioning

confidence: 99%

Absorbance spectral slopes for monitoring tropical peat water dissolved organic matter fractions during microbubble pre‐ozonation

Notodarmojo

Qadafi

Zevi

2023

CLEAN Soil Air Water

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The dissolved organic matter (DOM) protonated fractions of various hydrophobicities were correlated with the tropical peat waters' UV–Vis spectral slopes. This study was conducted to determine how microbubble pre‐ozonation affects UV–Vis spectral slopes in tropical peat water treatment processes This study was conducted to determine how microbubble pre‐ozonation affects UV–Vis spectral slopes in tropical peat water treatment processes. Microbubble pre‐ozonation was carried out at pH 7 followed by alum coagulation and activated carbon (AC) adsorption. The results showed that the log‐transformed UV–Vis absorption of processed peat water had four spectral slopes in the range of 220 to 420 nm. The degradation of the transphilic (TPH) DOM fraction had a strong negative correlation with the S220‐240 and S241‐272 values (R2 > 0.85). Similarly, the hydrophilic‐charged (HPIC) and hydrophilic‐neutral (HPIN) fractions had a strong negative correlation with the S220‐240 and S241‐272 values (R2 > 0.84 and R2 > 0.70). Meanwhile, the S273‐350 S>350 values had a low and negligible correlation with all analyzed DOM fractions (R2 < 0.30). The lower wavelength spectral slopes ratio (S220‐240/S241‐272) was moderately correlated with the DOM fraction, while the correlation with higher wavelength values was negligible. Based on these findings, the UV–Vis spectral slopes ratio at lower wavelengths appears to be useful information for developing a surrogate parameter of DOM fractions in peat water treatment processes.

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“…2 The non-contact dust removal solution uses high-pressure airflow generated by tools such as air knives and pneumatic nozzles to remove impurities and dust adhering to PCBs, and collects the raised dust and other pollutants by setting up dust-absorbing devices using the principle of negative pressure, but the air knives used as dust-blowing tools are too large in size, have limitations in installation location, and the number of nozzle openings is too large causing large air loss, and the dust removal angle is mostly fixed and cannot meet the dust-blowing needs of complex structure spaces. 3–5…”

Section: Introductionmentioning

confidence: 99%

Pneumatic rotary nozzle structure optimization design and airflow characteristics analysis

Wang,

Yang

2023

Advances in Mechanical Engineering

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In this paper, the impact jet field between the pneumatic nozzle and the workpiece surface is simulated by the computational fluid dynamics method, and the influence law of the nozzle structure parameters on the jet performance is obtained by combining the response surface method (RSM), so as to improve the dust removal effect of the pneumatic nozzle. Firstly, the nozzle impact jet field calculation model was established, and the experimental platform of wind speed and volume measurement was built to verify the accuracy of the numerical calculation model and to simulate and analyze the jet field distribution characteristics of the nozzle under rotating working conditions. Then combined with the Box-Behnken Design (BBD) method, a response surface regression model with nozzle inlet radius ( R1), cylindrical section length ( L), and cone angle ( A) as design variables and nozzle jet fixed point (20 mm) flow rate as the target variable was established to find the optimal combination of nozzle characteristics parameters. The results show that the optimized nozzle characteristics parameters using RSM can effectively improve the nozzle jet performance, the optimized jet flow rate increased by 8.38%, and can be more effective in dust removal; jet pressure on the workpiece surface decreases as the nozzle incidence angle increases; in the speed range of 400–1200 r/min, the pressure change caused by the jet on the wall surface is small, and the flow rate is relatively stable.

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Kinetic Study of Humic Acid Ozonation in Aqueous Media

Cited by 12 publications

References 32 publications

Catalytic Ozonation by Iron Coated Pumice for the Degradation of Natural Organic Matters

Catalytic Ozonation by Iron Coated Pumice for the Degradation of Natural Organic Matters

Absorbance spectral slopes for monitoring tropical peat water dissolved organic matter fractions during microbubble pre‐ozonation

Pneumatic rotary nozzle structure optimization design and airflow characteristics analysis

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