Catalytic wet air oxidation of aqueous ammonia with activated carbon

Aguilar, Croswel; Garcı́a, R.; Soto-Garrido, G.; Arriagada, Renán

doi:10.1016/s0926-3373(03)00229-7

Cited by 92 publications

(43 citation statements)

References 41 publications

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“…A good correlation of the catalytic activity and the surface concentration of quinone groups was also obtained in the gas phase oxidative dehydrogenation of ethylbenzene (ODH) over activated carbon catalyst [181]. Aguilar et al [137] investigated the catalytic wet oxidation of 1000-2600 ppm aqueous NH 3 solution over several HNO 3 oxidised or H 2 reduced activated carbons. The surface group distribution was determined by means of Boehm titration, FTIR spectroscopy and TPD analysis.…”

Section: Preparation and Characterisationmentioning

confidence: 94%

Carbon materials and catalytic wet air oxidation of organic pollutants in wastewater

et al. 2005

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Section: Preparation and Characterisationmentioning

confidence: 94%

Carbon materials and catalytic wet air oxidation of organic pollutants in wastewater

et al. 2005

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“…CWAO processes have been applied to the elimination of ammonia with a good efficiency, particularly when associated with the use of cobalt (II) oxide (CoO) as a catalyst at temperatures up to 260°C. Aguilar et al (2003) studied the oxidation of aqueous ammonia to nitrogen by CWAO process with AC as catalyst, confirming that ammonia conversion to nitrogen is favored by hydrogenated ACs in which the most acidic groups had been eliminated.…”

Section: Advanced Oxidation Processesmentioning

confidence: 82%

Physico-chemical technologies for nitrogen removal from wastewaters: a review

Capodaglio¹,

Hlavínek²,

Raboni³

2015

Rev. ambiente água

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The paper examines the main physico-chemical processes for nitrogen removal from wastewaters, considering both those that have been long known and still widely applied at the industrial scale, and those that are still at the research level. Special attention is paid to the latest technological developments, as well as to operational problems and fields of application. The processes considered are briefly summarized as follows: ammonia air and steam stripping; ammonia vacuum distillation; ammonia precipitation as struvite; ammonia and nitrate removal by selected ion exchange; breakpoint chlorination; chloramine removal by selected activated carbon; ammonia adsorption on charcoal; chemical reduction of nitrate; advanced oxidation processes to convert ammonia and organic-N into nitrogen gas or nitrate. Special attention is given to advanced oxidation processes, as great research efforts are currently addressed to their implementation. These specifically include ozonation, peroxon oxidation, catalytic wet air oxidation, photo-catalytic oxidation and electrochemical oxidation. Tecnologias físico-químicas para a remoção de nitrogênio das águas residuais: uma revisão RESUMO O trabalho examina os processos físico-químicos para a remoção de nitrogênio das águas residuais, considerando, tanto os muitos conhecidos e amplamente aplicados em escala industrial, como aqueles que ainda estão em fase de pesquisa. Em particular, são enfatizados os desenvolvimentos tecnológicos mais recentes, bem como os problemas de operação e aplicação. Os processos considerados são resumidos da seguinte forma: extração de amoníaco com ar ou com vapor; destilação a vácuo de amoníaco; precipitação de amônia como estruvita; remoção de amônia e de nitrato por troca iônica selecionada; cloração ao breakpoint; remoção das cloraminas por carvão ativado seletivo; adsorção de amoníaco em carvão vegetal; redução química de nitrato; processos oxidativos avançados para converter amônia e N-orgânico em gás nitrogênio ou em nitrato. Deu-se especial atenção aos processos oxidativos avançados, tendo em vista que grandes esforços de pesquisa estão atualmente dirigidos à sua implementação. Eles incluem, especificamente: ozonização, oxidação com peroxono, oxidação catalítica por via úmida, oxidação foto-catalítica e oxidação electroquímica.Palavras-chave: remoção de nitrogênio, tecnologias físico-químicas, tratamento de águas residuais.

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“…4 shows the FT-IR spectra of KOHactivated samples. The bands located at around 3500 cm -1 can be assigned to the -OH stretching vibration mode of hydroxyl functional groups [14].The peak at around 2929 cm -1 , which is easily observed in the case of CK21, indicates the presence of a methylene group (-CH2-) with CH stretching [15]. The peak at around 1745 cm -1 with observable transmittance in the case of CK21 and almost absent in the cases of CK11 and CK12 is attributed to lactone groups.…”

Section: Characterization Of Precursor and Activated Carbonsmentioning

confidence: 99%

Removal of deltamethrin insecticide over highly porous activated carbon prepared from pistachio nutshells

Hassan¹,

Youssef²,

Priecel³

2013

Carbon letters

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Potassium hydroxide-activated carbons (CK21, CK11, and CK12) were prepared from pistachio nutshells. Physicochemical properties of activated carbons were characterized by TGA, pH pzc , Fourier transform infrared spectroscopy, scanning electron microscopy, and N 2 -adsorption at -196°C. The examinations showed that activated carbons have high surface area ranging between 695-1218 m 2 /g, total pore volume ranging between 0.527-0.772 mL/g, and a pore radius around 1.4 nm. The presence of acidic and basic surface C-O groups was confirmed. Batch adsorption experiments were carried out to study the effects of adsorbent dosage, temperature, initial concentration of adsorbate, and contact time on deltamethrin adsorption by activated carbons. The kinetic studies showed that the adsorption data followed a pseudo-second order kinetic model. The Langmuir model showed a maximum adsorption capacity of 162.6 mg/g at 35°C on CK12. Thermodynamic studies indicated that adsorption was spontaneous and increased with temperature, suggesting an endothermic process.

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Catalytic wet air oxidation of aqueous ammonia with activated carbon

Cited by 92 publications

References 41 publications

Carbon materials and catalytic wet air oxidation of organic pollutants in wastewater

Carbon materials and catalytic wet air oxidation of organic pollutants in wastewater

Physico-chemical technologies for nitrogen removal from wastewaters: a review

Removal of deltamethrin insecticide over highly porous activated carbon prepared from pistachio nutshells

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