Treatment of nitrophenols by cathode reduction and electro-Fenton methods

Yuan, Songliu; Tian, Meng; Cui, Yanping; Li, Lin; Lü, Xiaohua

doi:10.1016/j.jhazmat.2006.02.069

Cited by 113 publications

(56 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the previous studies showed that the phenolic -OH group is electron-donating for the electrophilic aromatic substitution, while the -NO 2 group is electron-withdrawing. The electron-donating substituents increased the electron density at the ortho and para positions while the electron- withdrawing substituents were strongly deactivating and meta directing (Wei et al, 2011;Zhao et al, 2008;Yuan et al, 2006;Gao et al, 2004). Therefore, the ortho and para positions in the m-NP should be attacked by hydroxyl radicals preferentially.…”

Section: Electro-catalytic Degradation Of M-npmentioning

confidence: 99%

Investigation on electro-catalytic oxidation properties of carbon nanotube–Ce-modified PbO2 electrode and its application for degradation of m-nitrophenol

Duan

Zhao

Liu

et al. 2019

Arabian Journal of Chemistry

View full text Add to dashboard Cite

In this work a carbon nanotube-Ce-modified PbO 2 (CNT-Ce-PbO 2 ) electrode was prepared by electrodeposition method, and compared with pure PbO 2 , Ce-PbO 2 , and CNT-PbO 2 electrodes. The direct and indirect oxidation capacities of prepared electrodes in electro-catalytic oxidation processes were investigated by cyclic voltammetry and hydroxyl radical production tests, respectively. The electro-catalytic activity of electrodes was examined by electro-catalytic oxidation of a model pollutant of m-nitrophenol (m-NP). Besides, high-performance liquid chromatography (HPLC) was also employed to identify the products resulting from the electro-catalytic oxidation of m-NP and the degradation mechanism of m-NP was proposed. Results show that the CNT-CePbO 2 anode has higher direct and indirect oxidation capacities than pure PbO 2 , Ce-PbO 2 , and CNT-PbO 2 anodes. In the electro-catalytic oxidation of m-NP, the m-NP can be oxidized and degraded at all anodes, and the oxidation reactions of m-NP follow first-order kinetics. m-NP and TOC removal efficiencies are about 0.987 and 0.622 after electrolysis of 120 min and a maximum first-order rate constant of 0.036 min À1 is achieved at the CNT-Ce-PbO 2 anode, which are obviously higher than those of the other three kinds of anodes. Ó 2014 Production and hosting by Elsevier B.V. on behalf of King Saud University. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/3.0/).

show abstract

Section: Electro-catalytic Degradation Of M-npmentioning

confidence: 99%

Investigation on electro-catalytic oxidation properties of carbon nanotube–Ce-modified PbO2 electrode and its application for degradation of m-nitrophenol

Duan

Zhao

Liu

et al. 2019

Arabian Journal of Chemistry

View full text Add to dashboard Cite

show abstract

“…For these reasons, nitrophenols are considered as a priority pollutant by the Environmental Protection Agency (EPA) of USA, and its concentration in natural waters is restricted to less than 10 mg/L [5,6]. Up to date, various techniques such as membrane filtration [7,8], microbial degradation [9,10], photocatalytic degradation [11,12], electro-Fenton method [13,14], electrocoagulation [15,16], adsorption [17,18], electrochemical treatment http://dx.doi.org/10.1016/j.apcatb.2016. 10.020 0926-3373/© 2016 Elsevier B.V. All rights reserved.…”

Section: Introductionmentioning

confidence: 99%

Nickel nanoparticles decorated on electrospun polycaprolactone/chitosan nanofibers as flexible, highly active and reusable nanocatalyst in the reduction of nitrophenols under mild conditions

Karakaş

Çelebioğlu

Çelebı

et al. 2017

Applied Catalysis B: Environmental

View full text Add to dashboard Cite

a b s t r a c tToday, the reduction of nitro aromatics stands a major challenge because of the pollutant and detrimental nature of these compounds. In the present study, we show that nickel(0) nanoparticles (Ni-NP) decorated on electrospun polymeric (polycaprolactone(PCL)/chitosan) nanofibers (Ni-NP/ENF) effectively catalyze the reduction of various nitrophenols (2-nitrophenol, 2,4-dinitrophenol, 2,4,6-trinitrophenol) under mild conditions. Ni-NP/ENF nanocatalyst was reproducibly prepared by deposition-reduction technique. The detailed characterization of these Ni-NP/ENF based nanocatalyst have been performed by using various spectroscopic tools including ICP-OES, P-XRD, XPS, SEM, BFTEM, HRTEM and BFTEM-EDX techniques. The results revealed the formation of well-dispersed nickel(0) NP (d mean = 2.71-2.93 nm) on the surface of electrospun polymeric nanofibers. The catalytic activity of the resulting Ni-NP/ENF was evaluated in the catalytic reduction of nitrophenols in aqueous solution in the presence of sodium borohydride (NaBH 4 ) as reducing agent, in which Ni-NP/ENF nanocatalyst has shown high activity (TOF = 46.2 mol 2-nitrophenol/mol Ni min; 48.2 mol 2,4-dinitrophenol/mol Ni min; 65.6 mol 2,4,6-trinitrophenol/mol Ni min). More importantly, due to the nanofibrous polymeric support, Ni-NP/ENF has shown a flexible characteristics along with reusability property. Testing the catalytic stability of Ni-NP/ENF revealed that this new catalytic material provides high reusability performance (at 3rd reuse 86% for 2-nitrophenol, 83% 2,4-dinitrophenol and 82% 2,4,6-trinitrophenol) for the reduction of nitrophenols even at room temperature and under air. The present study reported here also includes the compilation of wealthy kinetic data for Ni-NP/ENF catalyzed the reduction of nitrophenols in aqueous sodium borohydride solution depending on temperature and type of support material (Al 2 O 3 , C, SiO 2 ) to understand the effect of the support material and determine the activation parameters.

show abstract

“…Their complete biodegradation usually requires several days or weeks. The decomposition and mineralization of nitrophenols in wastewater by the conventional methods, such as microbial and electrochemical treatments, are rather arduous due to their high stability and low solubility in water [1][2][3][4]. The organic compound 2,4-dinitrophenol (DNP), which is a yellow, crystalline solid and slightly soluble in water (0.14 g/100 mL water at 54.5 • C), is detected in urban or agricultural wastewaters including those from the manufacture of textiles, dyes, wood preservatives, photographic developer, explosives, and pesticides [1,5].…”

Section: Introductionmentioning

confidence: 99%

“…These highly reactive oxidants cause oxidative decompositions of organic compounds adsorbed on the TiO 2 surface [11][12][13]. The organic compounds decomposed by these photocatalytic reactions are finally mineralized to CO 2 , H 2 O, and other mineral ions, such as PO 4 3− , SO 4 2− , Cl − , and a mixture of NH 4 + , NO 2 − , and NO 3 − if such compounds contain P, S, Cl, and N, respectively [14]. The simplest way to carry out the photocatalytic reaction is to suspend TiO 2 particles in an aqueous solution.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic and adsorptive treatment of 2,4-dinitrophenol using a TiO2 film covering activated carbon surface

Cao

Oda

Shiraishi

2010

Chemical Engineering Journal

View full text Add to dashboard Cite

a b s t r a c tAnatase titanium dioxide (TiO 2 ) in particle sizes of roughly 0.5-20 m was prepared from amorphous TiO 2 in an aqueous H 2 O 2 solution by heating at 90 • C for 9 h and directly deposited on a PET film. On the other hand, granular activated carbon (AC) particles in sizes of 1-2 mm in diameter were adhesively deposited on a PET film, and their surfaces were also coated with TiO 2 . The resulting three preparations (TiO 2 -, AC-, and TiO 2 /AC-PET films) were set up in an annular-flow reactor to treat aqueous solutions of 2,4-dinitrophenol (DNP) in a batch-recirculation mode. The rate of DNP adsorption onto the TiO 2 /AC-PET film without UV irradiation was almost the same as that onto the AC-PET film, indicating that the attraction of DNP to AC was not lowered in the presence of TiO 2 film. Observation of SEM photographs suggests that this result is attributed to the porous structure of the thin TiO 2 film covering AC particles. The rate of DNP removal by the TiO 2 -AC PET film under UV irradiation was 2.9 times higher than that by the TiO 2 -PET film under UV irradiation, and was 1.1 times higher than the rate of DNP adsorption onto the AC-PET film. The rate of DNP removal by the AC-PET film decreased by 40% after six runs, while that by the TiO 2 /AC-PET film decreased by 22%. Durable experiments using the TiO 2 /AC-PET and AC-PET films clarified that the lifetime of the TiO 2 /AC-PET film is at least two times longer than that of the AC-PET film. This result suggests that DNP molecules are photocatalytically decomposed when passing through the porous TiO 2 -PET film, which lessens a burden of DNP adsorption on AC. Moreover, the DNP treatments in the batch-recirculation flow system suggested that the TiO 2 /AC-PET film saturated with DNP can be successfully regenerated at 60 • C.

show abstract

Treatment of nitrophenols by cathode reduction and electro-Fenton methods

Cited by 113 publications

References 24 publications

Investigation on electro-catalytic oxidation properties of carbon nanotube–Ce-modified PbO2 electrode and its application for degradation of m-nitrophenol

Investigation on electro-catalytic oxidation properties of carbon nanotube–Ce-modified PbO2 electrode and its application for degradation of m-nitrophenol

Nickel nanoparticles decorated on electrospun polycaprolactone/chitosan nanofibers as flexible, highly active and reusable nanocatalyst in the reduction of nitrophenols under mild conditions

Photocatalytic and adsorptive treatment of 2,4-dinitrophenol using a TiO2 film covering activated carbon surface

Contact Info

Product

Resources

About