Effluent treatment using electrochemically bleached seawater?oxidative degradation of pollutants

Jonnalagadda, Sreekantha B.; Nadupalli, Srinivasu

doi:10.1016/j.talanta.2003.11.045

Cited by 15 publications

(6 citation statements)

References 3 publications

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“…Since freshwater is a limited resource, the remediation of wastewater before its disposal is of major importance. Several techniques, such as coagulation, 4,5 chemical oxidation, [6][7][8] photochemical, 9,10 membrane separation and ion exchange, 11 irradiation, 12 decolourization by white fungi, 13 ozonation, 14,15 electrochemical destruction 16,17 and aerobic/anaerobic microbial degradation, 2,7 have been proposed for dye remediation in wastewater. In spite of the availability of these methods, steep challenges, such as sludge generation, high usage of energy, generation of dissolved oxygen, longer retention time, 2 release of aromatic compounds, formation of by-products, high operation costs and operation difficulty, are characteristic of these processes.…”

Section: Introductionmentioning

confidence: 99%

Effectiveness of carbon nanotube–cobalt ferrite nanocomposites for the adsorption of rhodamine B from aqueous solutions

et al. 2015

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The efficiency of adsorption of rhodamine B (RhB) from aqueous solution was investigated through a series of batch experiments by using cobalt ferrite nanoparticles (CoFe 2 O 4 ), acid-functionalized multiwalled carbon nanotubes (MWCNT-COOH) and carbon nanotube-cobalt ferrite nanocomposites. The adsorption capacity was evaluated as a function of pH, contact time, adsorbent dose, dye concentration and temperature. The effect of increasing the percentage of MWCNT-COOH in the nanocomposites was also studied. The adsorption capacity was lowest in CoFe 2 O 4 (5.165 mg g À1 ) and highest with MWCNT-COOH (42.68 mg g À1 ). For the nanocomposites, the adsorption capacity was enhanced with an increase in the amount of MWCNT-COOH. The optimum pH for adsorption was observed at 7 at which equilibrium was reached after 360 min. The kinetics of adsorption was fitted to the pseudo-first order, pseudo-second order, Elovich and intraparticle diffusion models. The results showed that the pseudo-second order model best described the data as reflected in the lowest value for the sum of squared residuals. Among the various adsorption isotherms tested, the Langmuir isotherm provided the best fit to the equilibrium data. The thermodynamic parameters, DH , DS and DG , were obtained over a temperature range of 20-45 C. Adsorption was spontaneous, endothermic and entropy-driven, except for one of the doped nanocomposites for which adsorption was exothermic. A good desorption of RhB from the loaded adsorbents was obtained by using either acetone or ethanol with a desorption efficiency in the range of 62-95%.

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Section: Introductionmentioning

confidence: 99%

Effectiveness of carbon nanotube–cobalt ferrite nanocomposites for the adsorption of rhodamine B from aqueous solutions

et al. 2015

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“…There is a large literature about the decolorization of wastewater containing organic dyes (Hao et al 2000;Kang et al 2000;Panswad and Luangdilok 2000;Park et al 2007). Sonolysis, chemical oxidation, photocatalytic degradation, aerobic and anaerobic biodegradation, and biosorption of organic dyes were also examined and discussed extensively (Stock et al 2000;Jonnalagadda and Nadupalli 2004;Gupta et al 2006). However, research on traits and dynamics of soils adsorbing organic dyes as emerging pollutants has not been involved basically.…”

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confidence: 99%

Adsorption–desorption characteristics and pollution behavior of reactive X-3B red dye in four Chinese typical soils

Zhou

Wang

2010

J Soils Sediments

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Purpose Organic dyes have been turned into an important emerging type of chemical pollutants with the development of rural textiles, synthetic dye, printing, and dyeing industries and the continuous release from washing fabrics and clothes in recent decades. In order to assess ecological risk of reactive X-3B red dye as a typical dye, the adsorptive and desorptive traits of the dye in soils were investigated and the environmental factors influencing those processes were examined and discussed. Materials and methods Adsorptive and desorptive isotherms and dynamics of reactive X-3B red dye as a typical emerging pollutant were investigated by the standard batch experiments using four typical soils in China including relatively clean brown earth (burozem), drab soil (cinnamon soil), paddy soil (aquorizem), and red soil (krasnozem) and calculated by mathematical models using the Microsoft Excel software. Results and discussion It was suggested that the adsorptive behavior of reactive X-3B red dye by the four soils can basically be described using the Langmuir equation, and their maximum adsorbing capacity was in the sequence paddy soil > red soil > brown earth > drab soil. The adsorption could be divided into four stages including highspeed adsorption, slowdown adsorption, tardiness adsorption, and zero-approaching adsorption. It was also indicated that the adsorption ability of the dye decreased with the reduction in soil organic matter or air temperature and under neutral, runny, or unwatered conditions. The increase of desorption was observed with the decrease of soil organic matter and the increase of air temperature or soil moisture, while desorption was inhibited by the acidification or basification of soils. The comparative study validated that the basic adsorption-desorption laws of the dye at high concentrations were basically consistent with those at low concentrations. Conclusions It could be concluded that reactive X-3B red dye has the potential properties of persistent organic pollutants with high ecological risk, and its release from contaminated soils and uptake by crops can be disturbed and changed by human activities.

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“…Popular among the methods that have been reported for the removal of organic dyes in wastewater are chemical oxidation, photochemical, ion exchange, irradiation, ozonation, and electrochemical destruction [11][12][13][14][15][16][17]. These methods however suffer from drawbacks such as the use of toxic and expensive chemicals, laborious reaction times, generation of hazardous by-products, and expensive equipment among others.…”

Section: Introductionmentioning

confidence: 99%

Kinetics and Thermodynamic Studies for Rhodamine B Dye Removal onto Graphene Oxide Nanosheets in Simulated Wastewater

Bankole¹

2019

AJAC

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This report describes for the first time the kinetics, thermodynamic and optimized conditions for maximum removal of Rhodamine B in aqueous solution onto nanosheets of graphene oxides. Results from the GONS characterizations: UV, TEM, FTIR, EDX and XRD, revealed successful introduction of oxygen functionalities on the pristine graphite lattices. Adsorptive behaviour of RhB dye onto GONS under different experimental conditions such as pH, initial concentrations, adsorbent dosage, temperature, and contact time, were fully discussed in this work. The study showed that ≈93% of RhB was removed from simulated wastewater at; sorbent mass of 16.67mg; pH of 6.5; temperature of 298K; contact time of 60min; and concentrations ranging from 2.5 to 30mg/L. Experimental data tested against results of the kinetics and adsorption isotherm models, revealed that the sorption of RhB were best described by pseudo-second order and Freundlich models, respectively. Regeneration of the spent adsorbent was investigated using water, methanol and methanol/acetic acid (9:1) solution, as desorbing eluents. Methanol solution of acetic acid was observed to remove up to 94% of adsorbed RhB from GO surface compared to water (71.36%), and methanol (45.52%). The ease at which RhB was eluted from RhB-loaded GO using methanol/acetic acid (9:1), methanol and water shows that the adsorption mechanism is best described by physisorption.

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Effluent treatment using electrochemically bleached seawater?oxidative degradation of pollutants

Cited by 15 publications

References 3 publications

Effectiveness of carbon nanotube–cobalt ferrite nanocomposites for the adsorption of rhodamine B from aqueous solutions

Effectiveness of carbon nanotube–cobalt ferrite nanocomposites for the adsorption of rhodamine B from aqueous solutions

Adsorption–desorption characteristics and pollution behavior of reactive X-3B red dye in four Chinese typical soils

Kinetics and Thermodynamic Studies for Rhodamine B Dye Removal onto Graphene Oxide Nanosheets in Simulated Wastewater

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