Studies on degradation of Methyl Orange wastewater by combined electrochemical process

Ma, Hongwen; Wang, Bo; Luo, Xiaoyan

doi:10.1016/j.jhazmat.2007.04.020

Cited by 95 publications

(41 citation statements)

References 22 publications

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“…A notable improvement of decolorization efficiency was realized with applied voltage increasing from 300 mV to 500 mV. The increased production of oxidant such as hydrogen peroxide at higher applied voltage might be responsible for this improvement as indicated by other studies [11,43]. As electrolysis was performed under the relatively low voltage without water decomposition in present study, further increase of applied voltage did not result in the more generation of above active substance, thus only a slight enhancement was obtained when the applied voltage further increased from 700 mV to 900 mV and the following experiments were conducted at 700 mV unless otherwise stated.…”

Section: Studies Of Operating Factorssupporting

confidence: 54%

“…Comparatively, chemical-oxidative processes have been employed for nitrogen-containing organic compounds removals removal from aqueous solutions extensively as they can decompose molecules effectively. By omitting the generation of sludge from Fenton process and the utilization of photocatalyst, electrolysis technology exhibits promising future for nitrogen-containing organic compounds contamination controls among chemical-oxidative processes [10,11]. As higher applied voltage (almost up to 12 V) or current (up to 6 A) are often required in these processes [12][13][14], thus other alternatives should be explored to strengthen their efficiencies with energy conservation.…”

Section: Introductionmentioning

confidence: 99%

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Utilization of single-chamber microbial fuel cells as renewable power sources for electrochemical degradation of nitrogen-containing organic compounds

Wang

Zhang

Borthwick

et al. 2015

Chemical Engineering Journal

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h i g h l i g h t sSingle-chamber microbial fuel cells (MFCs) are acted as renewable power sources. Enhanced degradation of nitrogen-containing organic compounds is realized. Higher applied voltage, lower initial concentration and pH improve the performance. Indirect electrochemical oxidation with generated H 2 O 2 is the main effect. a b s t r a c tBy employing promising single-chamber microbial fuel cells (MFCs) as renewable power sources, an aerated electrochemical system is proposed and for nitrogen-containing organic compounds (pyridine and methyl orange) removals. Carbon felt performed the best as electrode material while lower initial contaminant concentration and lower initial pH value could improve the performance. A degradation efficiency of 82.9% for pyridine was achieved after 360 min electrolysis with its initial concentration of 200 mg/L, initial pH of 3.0 and applied voltage of 700 mV. Mechanisms study implied that indirect electrochemical oxidation by generated hydrogen peroxide was responsible for their degradation. This study provides an alternative utilization form of low bioelectricity from MFCs and reveals that applying it to electrochemical process is highly-efficient as well as cost-effective for degradation of nitrogen-containing organic compounds.

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Section: Studies Of Operating Factorssupporting

confidence: 54%

Section: Introductionmentioning

confidence: 99%

Utilization of single-chamber microbial fuel cells as renewable power sources for electrochemical degradation of nitrogen-containing organic compounds

Wang

Zhang

Borthwick

et al. 2015

Chemical Engineering Journal

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“…It also causes the dissociation of functional groups over the surface of the adsorbent. At lower pH (under acidic condition), MO occurs as quinoid form, while at higher pH it rearranges in azo structure [31]. The basic and acidic structures of MO are given below (Eq.…”

Section: Effect Of Initial Phmentioning

confidence: 99%

Carbon coated monolith, a mesoporous material for the removal of methyl orange from aqueous phase: Adsorption and desorption studies

Hosseini¹,

Khan²,

Malekbala³

et al. 2011

Chemical Engineering Journal

172

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a b s t r a c tThe cordierite monolith was successfully modified to carbonaceous material termed as carbon coated monolith (CCM). Surface studies showed about 65% of the total pore volume falls in mesopore range with acidic functionality dominating over the surface. Batch adsorption experiments were carried out to study the applicability of CCM for the removal of methyl orange (MO) from aqueous solution. Different parameters such as effect of MO concentration, contact time, initial pH, regeneration and desorption potential of CCM were studied. Optimum adsorption of MO on CCM was observed at pH 6 (27.2 mg/g). The increase in initial MO concentration from 50 to 500 mg/L leads to increase in adsorption capacity from 15.99 to 88.5 mg/g. The observed equilibration time ranged in between 5000 and 5800 min. Linear and non-linear isotherm studies showed better applicability of Freundlich model. Kinetics studies showed better fitting for pseudo-second-order model. The Weber and Morris model showed multi-linearity indicating two or more steps were involved to describe the adsorption process. Desorption studies showed maximum recovery of MO when alkaline NaOH solution was used as an eluent. The regeneration studies showed decrease in adsorption capacity from 47.93 to 23.76 mg/g after three cycles.

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“…43 Nowadays, electrochemical oxidation technology is considered a green, efficient 44 method for the removal of contaminants from soil and water, owing to the strong 45 oxidative oxidants produced during electrolysis [14,15]. To date, electrochemical 46 process has been widely used for remediation of metal-contaminated aqueous systems, 47 with various metals as targets, including As, Pb, V, Cd [16][17][18] stronger direct electrochemical oxidation, and more active substances could also be 170 produced, both of which could promote the removal of Tl(I) [46]. With the aids of these oxidants, Tl(I) was oxidized satisfactorily to Tl(III) in a 215 current density of 5 mA cm -2 (Eq.…”

mentioning

confidence: 99%

Efficient electrochemical oxidation of thallium (I) in groundwater using boron-doped diamond anode

Zhang

Borthwick

et al. 2016

Electrochimica Acta

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Studies on degradation of Methyl Orange wastewater by combined electrochemical process

Cited by 95 publications

References 22 publications

Utilization of single-chamber microbial fuel cells as renewable power sources for electrochemical degradation of nitrogen-containing organic compounds

Utilization of single-chamber microbial fuel cells as renewable power sources for electrochemical degradation of nitrogen-containing organic compounds

Carbon coated monolith, a mesoporous material for the removal of methyl orange from aqueous phase: Adsorption and desorption studies

Efficient electrochemical oxidation of thallium (I) in groundwater using boron-doped diamond anode

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