Adsorption of herbicide 2-(2,4-dichlorophenoxy)propanoic acid by electrochemically generated aluminum hydroxides: an alternative to chemical dosing

Kamaraj, Ramakrishnan; Davidson, D. Jonas; Sozhan, Ganapathy; Vasudevan, Subramanyan

doi:10.1039/c5ra03339j

Cited by 69 publications

(28 citation statements)

References 22 publications

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“…It turned out that the adsorption equilibrium of nitrate on the NPs was accomplished in 180 min.Two simplified kinetic models, including pseudo‐first‐order and pseudo‐second‐order equations, were checked out. The rate constant of adsorption can be defined using the pseudo‐first‐orderequation given by Langergren :

log (q_{normale} - q_{normalt}) = log q_{normale} - [\frac{k_{1}}{2.303} t],

where k 1 is the pseudo‐first‐order rate constant (min −1 ), and q e and q t are the amounts of nitrate adsorbed (mg g −1 ) at equilibrium and at time t (min).…”

Section: Resultsmentioning

confidence: 99%

“…It turned out that the adsorption equilibrium of nitrate on the NPs was accomplished in 180 min.Two simplified kinetic models, including pseudo-first-order and pseudosecond-order equations, were checked out. The rate constant of adsorption can be defined using the pseudo-firstorderequation given by Langergren [36,37]: logðq e 2q t Þ5 logq e 2 k 1 2:303 t ;…”

Section: Adsorption Kinetic Modelmentioning

confidence: 99%

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Utilization of bare MgO, CeO₂, and ZnO nanoparticles for nitrate removal from aqueous solution

Mahdavi

Molodi

Zarabi

2018

Env Prog and Sustain Energy

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The traditional drinking water purification process is inefficient in removing nitrate significantly. Adsorption can be the most practical method for the removal of nitrate from drinking water. In this study, novel MgO, CeO2, and ZnO nanoparticles (NPs) were utilized for nitrate removal. The MgO, CeO2, and Zn NPs were characterized by Fourier transform infrared spectrometry (FT‐IR), scanning electron microscopy‐energy disperse X‐ray (SEM‐EDX), and X‐ray diffractometer (XRD) analysis. The efficiency of nitrate removal was examined through batch adsorption experiments. The influence of various parameters was studied, namely pH (3–8), temperature (15–40°C), time (10–1440 min), and liquid/solid weight ratio (L/S =25 mL/0.025 g). The optimum conditions from mentioned parameters were used in isotherm experiments with initial nitrate concentration (22–220 mg/L). The adsorption kinetics and isotherm data obeyed well Pseudo‐second‐order and linear and Freundlich models, indicating the multi layer‐chemisorption of nitrate ions. The maximum adsorption capacities of nitrate (N‐ NO3−1) calculated by final point of isotherm experiments were 86.4 mg/g for MgO, 57.6 mg/g for ZnO, and 58.6 mg/g for CeO2. The thermodynamic parameters ( ΔG°, Δ H °, ΔS°) were evaluated. From the thermodynamic parameters, it is suggested that the adsorption of nitrate on NPs followed the endothermic and spontaneous processes. The desorption potential of MgO, CeO2, and ZnO also showed the stability and reusability. Our findings also revealed that among studied NPs from this study and literature MgO NPs is potentially the best adsorbent for removal of nitrate from aqueous solutions. © 2018 American Institute of Chemical Engineers Environ Prog, 37: 1901–1907, 2018

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log (q_{normale} - q_{normalt}) = log q_{normale} - [\frac{k_{1}}{2.303} t],

where k 1 is the pseudo‐first‐order rate constant (min −1 ), and q e and q t are the amounts of nitrate adsorbed (mg g −1 ) at equilibrium and at time t (min).…”

Section: Resultsmentioning

confidence: 99%

Section: Adsorption Kinetic Modelmentioning

confidence: 99%

Utilization of bare MgO, CeO₂, and ZnO nanoparticles for nitrate removal from aqueous solution

Mahdavi

Molodi

Zarabi

2018

Env Prog and Sustain Energy

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“…The trend of removal ratio curve illustrated that with the expansion of inter‐electrode distance, the resistance enlarged and the electron transfer was blocked, thus slowing down the degradation of AR1. Short distance between anode and cathode required low energy for motion of ions, which due to that shorter travel path of electrons could decrease the resistance of electrons transfer, and then the productive rate of active groups was accelerated . But if the gap between two electrodes is too narrow, the system would result in short circuit and the too high electron transfer velocity causes the drastic oxygen evolution reaction which inhibits the direct oxidation of AR1.…”

Section: Resultsmentioning

confidence: 99%

Co₂O₃‐NH₂‐MCM‐41 Decorated Graphite as an Effective Electrode: Synthesis, Characterization and its Application for Electro‐catalytic Oxidation of Acid Red 1

Fan

Peng

et al. 2016

Electroanalysis

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1IntroductionDyes have been extensively used for thousands of years in textile [1],p rinting [2],p igments [3] and other applications.N owadays,w ith the rapid development of industries,d yes play ac ritical role in many fields. These are however plentifully discharged, leadingt oe ffluents having strong acidity or alkalinity,l arge amounts of colored species, huge amount of surfactant and even various harmful heavy metals like Cu, Cr and Ni [4].T heir intense color could reduce the transmission of sunlight throughw ater and thust he aquatic plants would be impacted;t hey are also hazardoust oa quatic organisms due to their cancerigenic property [5].H ence,r emoval of dyes from effluents is one of the most important environmentali ssues and admits of no delay.Mostly used conventionalm ethods for removing dyecontained waste water are chemical precipitation, membrane separation, catalytic oxidation, adsorption, electrochemical method and ozonation [ 6].A mong these treatments,c atalytic oxidation processes are considered as promising methods due to the in situ production of strong oxidants,m ainly hydroxyl radical( COH), and electro-catalytic oxidation has receivedg reat attention recently for the removal of organic pollutants,i ncludingd yes [7]. Moreover, the adsorption process is easy to manipulate, effective and cheap,w hich makes the combination of adsorptiona nd electro-catalytic oxidation to be both economical and efficient for removal of dyes.Thee lectrode materials play av ery important role in electro-catalytic oxidation. Many researchers have investigated lots of electrode materials,s uch as Au [8],I rO 2 [9],P d[ 10] and Pt-Ru alloys [11].A lthough electro-catalytic oxidation basedo nt hese materials exhibit good activities,high costs of these materials lead to the utilization of some less expensivem aterials,s uch as carbon, iron etc.[12].C orrosion of metallic materials during catalyst process limits the application of metals,w hich calls for utilization of carbon materials as efficient substitutes for solving these problems.A mongn umerousc arbonm aterials,g raphite has properties like high temperature resistance,c orrosionr esistance, porosity, large surface area and good conductivity [13].W hatsm ore,g raphite is perfectly suitable for acting as catalyst support due to its unique mechanical and electronic properties [14].M any previous literatures supported Co 2 O 3 as catalyst on electrode to acquire better catalytic efficiency [15].H ence,a pplying ac oating of Co on electrode could raise the activity of the electrode and the efficiencyo fe lectro-catalytic oxida-Abstract:T he graphite electrode decoratedw ith Co 2 O 3 -NH 2 -MCM-41w as successfully fabricated and the potential for applyingt his electrode for electro-catalytic oxidation of Acid Red 1( AR1)w as investigated.T he Co 2 O 3 -NH 2 -MCM-41w as characterized by Scanning Electron Microscope (SEM), Brunauer-Emmett-Teller (BET), Xray diffraction (XRD) and Fourier transform infrared spectra (FTIR). Electrochemicalm easurementsi ncluding cyc...

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“…The linear form of the pseudo-second-order kinetic model is given as following equation [48], The linear form of the pseudo-second-order kinetic model is given as following equation [48],…”

Section: Effect Of Temperature and Adsorption Kineticsmentioning

confidence: 99%

“…Where q e is defined above, q t (mg g 21 ) is the amount of Ni(II) adsorbed at any time (min) and k 1 (min 21 ) is the rate constant. The linear form of the pseudo-second-order kinetic model is given as following equation [48],…”

Section: Effect Of Temperature and Adsorption Kineticsmentioning

confidence: 99%

Use of laponite as adsorbents for Ni(II) removal from aqueous solution

Cao

Yan

Huang

et al. 2017

Env Prog and Sustain Energy

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Silicate‐bearing hectorites (laponite) were synthesized by hydrothermal method, and the laponite sample was characterized by Fourier transform infrared (FTIR) spectroscopy, X‐ray diffraction (XRD), zeta potential, Brunauer‐Emmett‐Teller (BET) surface area, and pore size analyses. The adsorption of Ni(II) from aqueous solution on laponite as a function of contact time, pH, ionic strength, laponite dosage, and temperature was studied via batch technique. The maximum removal of 99% (approx) could be achieved at the optimum adsorbent dosage of 2.5 g L−1 and near‐neutral pH. Adsorption of Ni(II) on laponite is strongly dependent on pH but independent on ionic strength. At low pH, the adsorption of Ni(II) was dominated by ion exchange with Li+ on laponite surfaces, whereas inner‐sphere surface complexation and surface precipitation were the main adsorption mechanisms at near‐neutral pH and alkaline environment, respectively. The adsorption kinetic data of Ni(II) on laponite were well described by the pseudo‐second‐order kinetics model. The intraparticle diffusion was involved in the adsorption process but was not the only rate‐controlling step. The adsorption isotherms of Ni(II) on laponite can be described well by the Langmuir model and the maximum Ni(II) adsorption capacity of laponite obtained from Langmuir model was 65.79 mg g−1. The thermodynamic studies indicated that the adsorption of Ni(II) on laponite was endothermic and spontaneous. The laponite exhibited excellent adsorption properties for Ni(II) uptake compared with various adsorbents, indicating that it is a suitable material as an adsorbent for preconcentration and immobilization of Ni(II) from aqueous solution. © 2017 American Institute of Chemical Engineers Environ Prog, 37: 942–950, 2018

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Adsorption of herbicide 2-(2,4-dichlorophenoxy)propanoic acid by electrochemically generated aluminum hydroxides: an alternative to chemical dosing

Cited by 69 publications

References 22 publications

Utilization of bare MgO, CeO₂, and ZnO nanoparticles for nitrate removal from aqueous solution

Utilization of bare MgO, CeO₂, and ZnO nanoparticles for nitrate removal from aqueous solution

Co₂O₃‐NH₂‐MCM‐41 Decorated Graphite as an Effective Electrode: Synthesis, Characterization and its Application for Electro‐catalytic Oxidation of Acid Red 1

Use of laponite as adsorbents for Ni(II) removal from aqueous solution

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Adsorption of herbicide 2-(2,4-dichlorophenoxy)propanoic acid by electrochemically generated aluminum hydroxides: an alternative to chemical dosing

Cited by 69 publications

References 22 publications

Utilization of bare MgO, CeO2, and ZnO nanoparticles for nitrate removal from aqueous solution

Utilization of bare MgO, CeO2, and ZnO nanoparticles for nitrate removal from aqueous solution

Co2O3‐NH2‐MCM‐41 Decorated Graphite as an Effective Electrode: Synthesis, Characterization and its Application for Electro‐catalytic Oxidation of Acid Red 1

Use of laponite as adsorbents for Ni(II) removal from aqueous solution

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Utilization of bare MgO, CeO₂, and ZnO nanoparticles for nitrate removal from aqueous solution

Utilization of bare MgO, CeO₂, and ZnO nanoparticles for nitrate removal from aqueous solution

Co₂O₃‐NH₂‐MCM‐41 Decorated Graphite as an Effective Electrode: Synthesis, Characterization and its Application for Electro‐catalytic Oxidation of Acid Red 1