Chemical Oxidation of 2,6-Dimethylaniline in the Fenton Process

This study applied a novel electrochemical process called the Fered-Fenton method to treat a highly concentrated wastewater. By combining electrochemical reduction and chemical oxidation, the process can remove organic compounds and heavy metals in a batch reactor. A PVC-stabilizer processing wastewater was treated in this investigation owing to its high heavy metal concentration (Pb = 7,500 mg/l) and high organic concentration (COD = 11,000 mg/l). The major organic component was acetate. Direct anodic oxidation showed no effect on COD removal. Fenton's method only removed 36% of COD using 4,000 mg-Fe2+/l and 28,000 mg-H2O2/l dosage. In the Fered-Fenton process, about 89% of COD was removed with 2,000 mg-Fe3+/l and 28,000 mg-H2O2/l. Furthermore, the COD removal attained an efficiency of about 98% for 56,000 mg-H2O2/l used. Results presented herein demonstrate that the Fered-Fenton method is superior to direct anodic oxidation and Fenton's method in this case. Furthermore, the changes of the intermediate compounds including acetate, oxadate, and formate during the reaction were analyzed, which provided us with the information to propose degradation reactions of the wastewater in this system.

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Chemical oxidation of bis(2-chloroethyl) ether in the Fenton process: Kinetics, pathways and toxicity assessment

Chemosphere ◽

10.1016/j.chemosphere.2017.03.104 ◽

2017 ◽

Vol 180 ◽

pp. 117-124 ◽

Cited By ~ 11

Author(s):

Jiaqi Shi ◽

Tao Long ◽

Rongrong Ying ◽

Lei Wang ◽

Xin Zhu ◽

...

Keyword(s):

Chemical Oxidation ◽

Toxicity Assessment ◽

Fenton Process ◽

Process Kinetics

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Chemical oxidation of 2,4-dimethylphenol in soil by heterogeneous Fenton process

Journal of Hazardous Materials ◽

10.1016/j.jhazmat.2008.05.123 ◽

2009 ◽

Vol 162 (2-3) ◽

pp. 785-790 ◽

Cited By ~ 31

Author(s):

Arturo Romero ◽

Aurora Santos ◽

Fernando Vicente

Keyword(s):

Chemical Oxidation ◽

Fenton Process ◽

Heterogeneous Fenton

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Chemical oxidation for mitigation of UV-quenching substances (UVQS) from municipal landfill leachate: Fenton process versus ozonation

Water Research ◽

10.1016/j.watres.2016.11.005 ◽

2017 ◽

Vol 108 ◽

pp. 260-270 ◽

Cited By ~ 55

Author(s):

Chanil Jung ◽

Yang Deng ◽

Renzun Zhao ◽

Kevin Torrens

Keyword(s):

Landfill Leachate ◽

Chemical Oxidation ◽

Fenton Process ◽

Municipal Landfill

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Oxidative Degradation of Tannic Acid in Aqueous Solution by UV/S2O82− and UV/H2O2/Fe2+ Processes: A Comparative Study

Applied Sciences ◽

10.3390/app9010156 ◽

2019 ◽

Vol 9 (1) ◽

pp. 156 ◽

Cited By ~ 5

Author(s):

Sondos Dbira ◽

Nasr Bensalah ◽

Moustafa M. Zagho ◽

Massouda Ennahaoui ◽

Ahmed Bedoui

Keyword(s):

Hydroxyl Radicals ◽

Tannic Acid ◽

Natural Waters ◽

Oxidative Degradation ◽

Complete Removal ◽

Organic Pollution ◽

Chemical Oxidation ◽

Photocatalytic Decomposition ◽

Fenton Process ◽

Toc Removal

Tannic acid (TA) is a major pollutant present in the wastewater generated from vegetable tanneries process and food processing. This work studied TA degradation by two advanced oxidation processes (APOs): UV irradiation at the wavelength of 254 nm in the presence of hydrogen peroxide (H2O2) and ferrous iron (photo-Fenton) and in the presence of potassium persulfate. The influence of certain experimental parameters such as K2S2O8, H2O2, Fe2+, and TA concentrations, initial pH and temperature was evaluated in order to obtain the highest efficiency in terms of aromatics (decay in UV absorbance at 276 nm) and TOC removals. Chemical oxidation of TA (0.1 mM) by UV/persulfate achieved 96.32% of aromatics removal and 54.41% of TOC removal under optimized conditions of pH = 9 and 53.10 mM of K2S2O8 after 60 min. The treatment of TA by photo-Fenton process successfully led to almost complete aromatics removal (99.32%) and high TOC removal (94.27%) from aqueous solutions containing 0.1 mM of TA at natural pH = 3 using 29.4 mM of H2O2 and 0.18 mM of Fe2+ at 25 °C after 120 min. More efficient degradation of TA by photo-Fenton process than UV/persulfate was obtained, which confirms that hydroxyl radicals are more powerful oxidants than sulfate radicals. The complete removal of organic pollution from natural waters can be accomplished by direct chemical oxidation via hydroxyl radicals generated from photocatalytic decomposition of H2O2.

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Chemical oxidation of sulfadiazine by the Fenton process: Kinetics, pathways, toxicity evaluation

Journal of Environmental Science and Health Part B ◽

10.1080/03601234.2014.951572 ◽

2014 ◽

Vol 49 (12) ◽

pp. 909-916 ◽

Cited By ~ 18

Author(s):

Ji-Feng Yang ◽

Shi-Biao Zhou ◽

An-Guo Xiao ◽

Wen-Jun Li ◽

Guang-Guo Ying

Keyword(s):

Chemical Oxidation ◽

Fenton Process ◽

Toxicity Evaluation ◽

Process Kinetics

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Bioadsorption of Multiple Heavy Metal Ions by Rhizophora Apiculate sp. and Elaesis Guineensis sp.

Scientific Research Journal ◽

10.24191/srj.v14i1.2699 ◽

2017 ◽

Vol 14 (1) ◽

pp. 15

Author(s):

M.B. Nicodemus Ujih ◽

Mohammad Isa Mohamadin ◽

Milla-Armila Asli ◽

Bebe Norlita Mohammed

Keyword(s):

Heavy Metal ◽

Metal Ions ◽

Removal Efficiency ◽

Heavy Metal Ions ◽

Agricultural Waste ◽

Living Organism ◽

Heavy Metal Concentration ◽

Industrial Area ◽

Electrochemical Treatment ◽

Chemical Oxidation

Heavy metal ions contamination has become more serious which is caused by the releasing of toxic water from industrial area and landfill that are very harmful to all living organism especially human and can even cause death if contaminated in small amount of heavy metal concentration. Currently, peoples are using classic method namely electrochemical treatment, chemical oxidation/reduction, chemical precipitation and reverse osmosis to eliminate the metal ions from toxic water. Unfortunately, these methods are costly and not environmentally friendly as compared to bioadsorption method, where agricultural waste is used as biosorbent to remove heavy metals. Two types of agricultural waste used in this research namely oil palm mesocarp fiber (Elaesis guineensis sp.) (OPMF) and mangrove bark (Rhizophora apiculate sp.) (MB) biomass. Through chemical treatment, the removal efficiency was found to improve. The removal efficiency is examined based on four specification namely dosage, of biosorbent to adsorb four types of metals ion explicitly nickel, lead, copper, and chromium. The research has found that the removal efficiency of MB was lower than OPMF; whereas, the multiple metals ions removal efficiency decreased in the order of Pb2+ > Cu2+ > Ni2+ > Cr2+.

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Effects of Wet Chemical Oxidation on Surface Functionalization and Morphology of Highly Oriented Pyrolytic Graphite

10.26434/chemrxiv.12907604.v1 ◽

2020 ◽

Author(s):

Mikhail Trought ◽

Isobel Wentworth ◽

Timothy Leftwich ◽

Kathryn Perrine

Keyword(s):

Surface Functionalization ◽

Functional Group ◽

Pyrolytic Graphite ◽

Surface Oxidation ◽

Chemical Oxidation ◽

Synthesis Methods ◽

Acid Solutions ◽

Highly Oriented Pyrolytic Graphite ◽

Wet Chemical ◽

Surface Morphologies

The knowledge of chemical functionalization for area selective deposition (ASD) is crucial for designing the next generation heterogeneous catalysis. Surface functionalization by oxidation was studied on the surface of highly oriented pyrolytic graphite (HOPG). The HOPG surface was exposed to with various concentrations of two different acids (HCl and HNO3). We show that exposure of the HOPG surface to the acid solutions produce primarily the same -OH functional group and also significant differences the surface topography. Mechanisms are suggested to explain these strikingly different surface morphologies after surface oxidation. This knowledge can be used to for ASD synthesis methods for future graphene-based technologies.

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A Solvent Free Synthetic Route for Cerium(IV) Metal-Organic Frame-works with UiO-66 Architecture and Their Photocatalytic Application

10.26434/chemrxiv.9199634.v1 ◽

2019 ◽

Author(s):

Matteo Campanelli ◽

Tiziana Del Giacco ◽

Filippo De Angelis ◽

Edoardo Mosconi ◽

Marco Taddei ◽

...

Keyword(s):

Density Functional ◽

Chemical Oxidation ◽

Solvent Free ◽

Cerium Ammonium Nitrate ◽

Benzylic Alcohols ◽

Near Ultraviolet ◽

Photocatalytic Application ◽

Activity Density ◽

Ultraviolet Light Irradiation ◽

Metal Organic

<div> <p>A novel solvent-free synthesis for Ce-UiO-66 metal-organic frameworks (MOFs) is presented. The MOFs are obtained by simply grinding the reagents, cerium ammonium nitrate (CAN) and the carboxylic linkers, in a mortar for few minutes with the addition of a small amount of acetic acid (AcOH) as modulator (1.75 eq, o.1 ml). The slurry is then transferred into a 1 ml vial and heated at 120°C for 1 day. The MOFs have been characterized for their composition, crystallinity and porosity and employed as heterogenous catalysts for the photo-oxidation reaction of substituted benzylic alcohols to benzaldaldehydes under near ultraviolet light irradiation. The catalytic performances, such as yield, conversion and kinetics, exceed those of similar systems studied by chemical oxidation and using Ce-MOF as catalyst. Moreover, the MOFs were found to be reusable up to three cycles without loss of activity. Density functional theory (DFT) calculations gave an estimation of the band-gap shift due to the different nature of the linkers used and provide useful information on the catalytic activity experimentally observed.</p> </div>

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