Mineralization of pyrrole, a recalcitrant heterocyclic compound, by electrochemical method: Multi-response optimization and degradation mechanism

Hiwarkar, Ajay Devidas; Singh, Seema; Srivastava, Vimal Chandra; Mall, Indra Deo

doi:10.1016/j.jenvman.2017.04.051

Cited by 31 publications

(16 citation statements)

References 38 publications

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“…Therefore, the mineralization efficiency increases. 30,31 Due to the water oxidation reaction at the anode surface, • OH radical adsorption occurs at the anode surface. These adsorbed • OH radicals strongly react with Ti/RuO 2 to form Ti/RuO 2 /O (as shown by the equations below).…”

Section: Resultsmentioning

confidence: 99%

“…This is because the number of electrons over the anode surface increases with j , which enhanced the formation of physisorbed and chemisorbed • OH radicals on the electrode surface. Therefore, the mineralization efficiency increases. , Due to the water oxidation reaction at the anode surface, • OH radical adsorption occurs at the anode surface. These adsorbed • OH radicals strongly react with Ti/RuO 2 to form Ti/RuO 2 /O (as shown by the equations below).…”

Section: Resultsmentioning

confidence: 99%

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Ultrasound-Induced Intensification of Electrochemical Treatment of Bulk Drug Pharmaceutical Wastewater

Patidar

Srivastava

2021

ACS EST Water

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This study was carried out to intensify the electrochemical treatment of bulk drug pharmaceutical wastewater (BDW) using ultrasound. The effects of the operating parameters on chemical oxygen demand (COD) and total organic carbon (TOC) removal efficiency were studied using a response surface methodology-based central composite design. Under optimum conditions that included an ultrasonic power of 67 W, a current density of 173 A m–2, an initial pH of 4.5, and an interelectrode distance of 0.5 cm, COD and TOC removal efficiencies were found to be 69% and 60%, respectively; the specific energy consumption was 0.69 kWh (g of COD removed)−1, and a synergistic effect of 1.1 was obtained. The morphology and topography analysis of the electrodes after the treatment confirmed continuous in situ cleaning of the electrode because of the use of ultrasound. A possible mineralization pathway based on transformation products formed (identified using liquid chromatography quadrupole time-of-flight mass spectroscopy) was proposed. Phytotoxicity analysis showed that the toxicity of BDW was significantly reduced and the seed germination rate increased to 85% after treatment.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Ultrasound-Induced Intensification of Electrochemical Treatment of Bulk Drug Pharmaceutical Wastewater

Patidar

Srivastava

2021

ACS EST Water

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“…On the other hand, the color removal efficiency was strongly enhanced when increasing current intensity at the lowest electrolysis time of 30 min, but rose slightly at the highest electrolysis time of 90 min from 3 to 4.6A and then slightly decreased from 4.6 to 5A. The fact that oxidation rate was not affected at increased electrolysis time can be explained by the accumulation of by-products, such as carboxylic acids, that are quite stable against further attack at Ti/Pt electrodes 35 .…”

Section: Response Surface and Contour Plots For Mo Color Removal Effimentioning

confidence: 94%

Optimization of textile azo dye degradation by electrochemical oxidation using Box-Behnken Design

Oukili

Loukili

2019

Mediterr.J.Chem.,

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Degradation of textile azo dye solutions containing Methyl Orange by anodic oxidation using an electrochemical reactor was studied. The combined effect of independent parameters (current intensity, initial pH and electrolysis time) on color removal efficiency was investigated and optimized using response surface methodology. A Box-Behnken design was successfully employed for experimental design. The obtained quadratic model was statistically tested using analysis of variance (ANOVA). Results showed that the optimal operating conditions to achieve 98.51% efficiency for color removal were current intensity = 4.6 A, initial pH= 4 and electrolysis time = 65 min, at a dye concentration and temperature of 50 mg/L and 25 Â°C, respectively.

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“…According to the adsorption capacities on coal AC, pyrrole and N ‐acetyl‐ d ‐glucosamine (NAG) were considered as high‐adsorption compounds, while leucine and Aldrich humic acid (AHA) were classified as medium adsorption materials; urea was considered as a low‐adsorption compound with <0.01 mg N/g on coal AC (Mohtadi et al, 2017). Studies have shown that NAG, leucine, and urea are bioavailable, while pyrrole and AHA are refractory organic compounds for biodegradation (Fan et al, 2018; Hiwarkar et al, 2017; Li et al, 2016; Singh et al, 2015; Subbaramaiah et al, 2013). These five compounds were examined to see how their different adsorption and bioavailability properties might affect the biotransformation of synthetic stormwater DON.…”

Section: Methodsmentioning

confidence: 99%

Removal of stormwater dissolved organic nitrogen through biotransformation using activated carbon

Mohtadi

James

Krasnoff

et al. 2022

Water Environment Research

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Conventional bioretention systems are not effectively designed to remove stormwater dissolved organic nitrogen (DON). Biotransformation study on five organic nitrogenous compounds with different values for adsorption on coal activated carbon (AC) and bioavailability revealed that adsorption is a greater controlling factor for ammonification than bioavailability. This study also showed three apparent benefits: enhancement of the ammonification rate, ammonification of the bio‐recalcitrant organic nitrogenous compounds, for example, pyrrole, and bio‐regeneration of the adsorbent (coal AC). Low temperature (4°C) did not impact ammonification of leucine at a velocity of 34 cm/h, but negatively affected it at 61 cm/h. It was also observed that bed media height > 30 cm would not appreciably increase ammonification. Under intermittent wetting/draining conditions, the DON removal efficiency was more than 90%, indicating that DON was successfully removed through concurrent adsorption/ammonification, although generated ammonium in the effluent must be properly addressed. Practitioner Points Coal activated carbon appears a better material for DON ammonification compared with charcoal and quartz sand. A temperature as low as 4°C may not adversely impact DON ammonification at a velocity of 34 cm/h or less. A bed media depth of 30 cm is considered as adequate to promote DON ammonification. A larger depth may not be expected to improve ammonification. Ammonification of the bio‐recalcitrant organic nitrogenous compounds, for example, pyrrole, and bio‐regeneration of the adsorbent, for example, coal activated carbon, may be achieved.

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Mineralization of pyrrole, a recalcitrant heterocyclic compound, by electrochemical method: Multi-response optimization and degradation mechanism

Cited by 31 publications

References 38 publications

Ultrasound-Induced Intensification of Electrochemical Treatment of Bulk Drug Pharmaceutical Wastewater

Ultrasound-Induced Intensification of Electrochemical Treatment of Bulk Drug Pharmaceutical Wastewater

Optimization of textile azo dye degradation by electrochemical oxidation using Box-Behnken Design

Removal of stormwater dissolved organic nitrogen through biotransformation using activated carbon

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