Effect of Ni incorporation into goethite in the catalytic activity for the oxidation of nitrogen compounds in petroleum

Souza, Wladmir F.; Guimarães, Iara do Rosário; Oliveira, Luiz C.A.; Giroto, Amanda S.; Guerreiro, Mário César; Silva, Carmen L. T.

doi:10.1016/j.apcata.2010.03.036

Cited by 25 publications

(11 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, the degradation capability of goethite/H 2 O 2 can be greatly improved by the combination of UV irradiation [16][17][18]. To enhance the photocatalytical activity of a-FeOOH, structure modifications by doping with cations have also been studied by many authors [19][20][21][22]. In our preliminary experiment, akaganeite (b-FeOOH) displayed higher catalytic activity than a-FeOOH.…”

Section: Introductionmentioning

confidence: 89%

Microwave–ultrasound assisted synthesis of β-FeOOH and its catalytic property in a photo-Fenton-like process

Fang

et al. 2015

Ultrasonics Sonochemistry

View full text Add to dashboard Cite

In this study, nanoparticles of single-phase akaganeite (β-FeOOH) were synthesized by an ultrasound-microwave assisted method. The synthesis parameters were optimized by means of response surface methodology. X-ray diffractions (XRD), Fourier transform infrared spectrum (FTIR), UV-vis diffused reflection spectra (UV-vis DRS), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and specific surface area were used to characterize the as-prepared samples. The catalytic activity of the prepared β-FeOOH was evaluated in a heterogeneous photo-Fenton-like process using methyl orange as target pollutant. It is found that the reaction temperature and interaction between microwave and ultrasound have a significant influence on the catalytic properties of the prepared β-FeOOH samples. The β-FeOOH prepared at microwave power of 400 W, ultrasound power of 200 W, reaction temperature of 70°C and reaction time of 3 h, exhibited considerable catalytic activity in weak alkaline solution and under visible light irradiation, which would be of great promise for the industrial application of this catalyst to oxidize organic pollutants for wastewater treatment.

show abstract

Section: Introductionmentioning

confidence: 89%

Microwave–ultrasound assisted synthesis of β-FeOOH and its catalytic property in a photo-Fenton-like process

Fang

et al. 2015

Ultrasonics Sonochemistry

View full text Add to dashboard Cite

show abstract

“…Similarly, Nb-hematite reduction at 500 C resulted in the formation of magnetite, but at higher temperatures, Nb was expelled from the structure; whereas the pure hematite reduced to metallic iron at 900 C (Silva et al, 2009). Frequent reports from the characterisation studies of this category of heterogeneous catalysts using BrunauereEmmetteTeller (BET) surface area analysis represented a significant increase in surface area (de Souza et al, 2010;Magalhães et al, 2007;Zhong et al, 2012) that could be due to the decline in their particle size and/or pore diameter (Silva et al, 2009). For instance, Fe 3þ substitution by Cr 3þ in Fe 3-x Cr x O 4 decreased the pore diameter from meso to micro-size resulted in a significant increase in surface area (Magalhães et al, 2007).…”

Section: Physico-chemical Changesmentioning

confidence: 99%

Review on the application of modified iron oxides as heterogeneous catalysts in Fenton reactions

Pouran

Raman

Daud

2014

Journal of Cleaner Production

623

140

View full text Add to dashboard Cite

Heterogeneous Fenton reaction is an advanced oxidation process which has gained wide spread acceptance for higher removal efficiency of recalcitrant organic contaminants under wide range of pH compared to homogeneous reactions. Conventionally, iron oxides are used as heterogeneous catalysts for Fenton oxidation system because of their abundance, easy separation and lower cost. This paper reviews the substitution of iron in an iron oxide with other transition metals as a mean to improve the properties of the iron oxide towards higher performance for contaminant degradation. Several studies have reported enhanced performance resulted from this substitution based on two possible mechanisms. First is the conjugation of redox pairs of iron species and imported active ion in hydroxyl radical production cycle. Second: the generation of oxygen vacancies as active sites on the surface of catalyst via adjustments for unequal charge substitutions. This class of catalysts is anticipated to work effectively for treatment of various recalcitrant wastewaters using Fenton oxidation system. Subsequently, the stability of the produced catalyst needs to be examined under various experimental conditions to prevent the adverse effects of transition metals on the receiving environment.

show abstract

“…Figure 14 shows a proposal for the formation of possible intermediate of quinoline oxidation reaction. The formation of these oxidized intermediates is reported in the literature by Oliveira et al and Souza et al (de Souza et al 2010;Oliveira et al 2013b). …”

Section: Methodsmentioning

confidence: 87%

Synthesis and characterization of catalysts based on mesoporous silica partially hydrophobized for technological applications

Martins

Salviano

Oliveira

et al. 2016

Environ Sci Pollut Res

View full text Add to dashboard Cite

In this work, mesoporous silica mobil composition of matter no. 41 (MCM-41) was synthesized by the sol-gel method. Two different surface modifications were made to transform this material into a very active adsorbent and catalyst support: (i) impregnation of iron nanoparticles and (ii) hydrophobization via chemical vapor deposition (CVD) with ethanol. The materials prepared with different iron contents, i.e., 2.5, 5, and 10 %, after hydrophobization, were characterized by several techniques. CHN analysis and Raman spectroscopy proved that approximately 15 % of carbon is deposited during CVD process mainly as organized carbonaceous structures. The specific surface area was determined by the BET method as up to 1080 m g, which explains the excellent results of the materials in the adsorption of model dyes methylene blue and indigo carmine. Mössbauer spectroscopy, thermogravimetric (TG)/DTG analysis, and transmission electron microscopy (TEM) images showed that the iron supported may be partially reduced during the CVD process to Fe species, which are stabilized by the carbon coating. This iron species plays an important role in the oxidation of different contaminants, such as quinoline and methylene blue. The results obtained in the catalytic tests showed to be very promising.

show abstract

Effect of Ni incorporation into goethite in the catalytic activity for the oxidation of nitrogen compounds in petroleum

Cited by 25 publications

References 22 publications

Microwave–ultrasound assisted synthesis of β-FeOOH and its catalytic property in a photo-Fenton-like process

Microwave–ultrasound assisted synthesis of β-FeOOH and its catalytic property in a photo-Fenton-like process

Review on the application of modified iron oxides as heterogeneous catalysts in Fenton reactions

Synthesis and characterization of catalysts based on mesoporous silica partially hydrophobized for technological applications

Contact Info

Product

Resources

About