Cobalt modified red mud catalytic ozonation for the degradation of bezafibrate in water: Catalyst surface properties characterization and reaction mechanism

Xu, Bin; Qi, Fei; Zhang, Jizhou; Li, Huanan; Sun, Dezhi; Robert, Didier; Chen, Zhonglin

doi:10.1016/j.cej.2015.09.032

Cited by 65 publications

(13 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As shown in Figure 15, different TBA doses showed the same inhibitory effect. As verified in many studies, all TBA doses used in this study consume OH• in the catalytic ozonation process [5]. TBA presence in singular ozonation processes inhibits performance by 13.0%.…”

Section: Influence Of Tba Dosage On the Performance Of Catalytic Ozonsupporting

confidence: 63%

“…Given the reaction rate constant per unit catalyst dose, it was decided that a 0.050 g L −1 catalyst dose was optimal. In the aqueous environment, NOM degrades by singular and catalytic ozonation matches the pseudo-first-order kinetic model; this is due to overloading the catalyst or oxidant in the system [5,23,24] (shown as Equations (2) and (3) and the establishment of the above should be based on the assumption of overloaded oxidants and catalyst).…”

Section: Catalyst Dosagementioning

confidence: 94%

See 1 more Smart Citation

Catalytic Ozonation by Iron Coated Pumice for the Degradation of Natural Organic Matters

Alver

Kılıç

2018

Catalysts

View full text Add to dashboard Cite

The use of iron-coated pumice (ICP) in heterogeneous catalytic ozonation significantly enhanced the removal efficiency of natural organic matters (NOMs) in water, due to the synergistic effect of hybrid processes when compared to sole ozonation and adsorption. Multiple characterization analyses (BET, TEM, XRD, DLS, FT-IR, and pH PZC ) were employed for a systematic investigation of the catalyst surface properties. This analysis indicated that the ICP crystal structure was α-FeOOH, the surface hydroxyl group of ICP was significantly increased after coating, the particle size of ICP was about 200-250 nm, the BET surface area of ICP was about 10.56 m 2 g −1 , the pH PZC value of ICP was about 7.13, and that enhancement by iron loading was observed in the FT-IR spectra. The contribution of surface adsorption, hydroxyl radicals, and sole ozonation to catalytic ozonation was determined as 21.29%, 66.22%, and 12.49%, respectively. The reaction kinetic analysis with tert-Butyl alcohol (TBA) was used as a radical scavenger, confirming that surface ferrous iron loading promoted the role of the hydroxyl radicals. The phosphate was used as an inorganic probe, and significantly inhibited the removal efficiency of catalytic NOM ozonation. This is an indication that the reactions which occur are more dominant in the solution phase.

show abstract

Section: Influence Of Tba Dosage On the Performance Of Catalytic Ozonsupporting

confidence: 63%

Section: Catalyst Dosagementioning

confidence: 94%

Catalytic Ozonation by Iron Coated Pumice for the Degradation of Natural Organic Matters

Alver

Kılıç

2018

Catalysts

View full text Add to dashboard Cite

show abstract

“…Xu et al [175] studied the cobalt-loaded red mud (RM) catalytic ozonation of bezafibrate (BZF) degradation. The contributions of 39.22% of molecular ozone, 45.20% of hydroxyl radicals, and 15.57% of surface adsorption to BZF degradation were identified, confirming that radical oxidation played an important role in the catalytic ozonation.…”

Section: Minerals Modified With Metalsmentioning

confidence: 99%

Application of Heterogeneous Catalytic Ozonation for Refractory Organics in Wastewater

et al. 2019

View full text Add to dashboard Cite

Catalytic ozonation is believed to belong to advanced oxidation processes (AOPs). Over the past decades, heterogeneous catalytic ozonation has received remarkable attention as an effective process for the degradation of refractory organics in wastewater, which can overcome some disadvantages of ozonation alone. Metal oxides, metals, and metal oxides supported on oxides, minerals modified with metals, and carbon materials are widely used as catalysts in heterogeneous catalytic ozonation processes due to their excellent catalytic ability. An understanding of the application can provide theoretical support for selecting suitable catalysts aimed at different kinds of wastewater to obtain higher pollutant removal efficiency. Therefore, the main objective of this review article is to provide a summary of the accomplishments concerning catalytic ozonation to point to the major directions for choosing the catalysts in catalytic ozonation in the future.

show abstract

“…8 Other catalysts such as dolomite and WO3/ZrO2 have also been investigated for stabilization oxides, including Fe, Al, Ti, Na, Ca, and Si, as well as some trace elements, including Ga, Cr, Mn, Ni, S, Zr, K, and Co, but the actual composition depends on the process origin. [29][30][31][32][33][34] Although red mud has been investigated as a catalyst, [35][36][37][38] environmental remediation, 39 ceramics, building materials, 40 fillers, sorbents and coagulants, 41 and valuable metals recovery; 42 it is still disposed in clay-lined dams or dykes and allowed to dry naturally.…”

Section: Introductionmentioning

confidence: 99%

Hydrodeoxygenation of Aqueous-Phase Catalytic Pyrolysis Oil to Liquid Hydrocarbons Using Multifunctional Nickel Catalyst

Jahromi

Agblevor

2018

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

Herein we investigated the hydrodeoxygenation (HDO) of aqueous phase pinyon-juniper catalytic pyrolysis oil (APPJCPO) using a new multifunctional red mud-supported nickel (Ni/RM) catalyst. The organic liquid yield after HDO of APPJCPO using 30 wt. % Ni/RM at reaction temperature of 350 °C was 47.8 wt. % with oxygen content of 1.14 wt. %. The organic liquid fraction consisted of aliphatics, aromatics, and alkylated aromatic hydrocarbons as well as small amounts of oxygenates. The RM support catalyzed ketonization of carboxylic acids. The Ni metal catalyzed partial reduction of oxygenates that underwent carbonyl alkylation with aldehydes and ketones on the RM. Catalyst deactivation assessment suggested that oxidation and coke formation were the main controlling factors for deactivation of Ni and RM respectively. For comparison, commercial (~65wt.%) Ni/SiO2-Al2O3 was tested in HDO experiments which gasified the soluble organics in APPJCPO and did not produce liquid hydrocarbons. Keywords:Hydrodeoxygenation, pyrolysis, red mud, nickel catalysts, catalyst deactivation, bio-oils and upgrading of bio-oil and showed promise. [8][9][10] These studies showed that the challenge with hydrogenation of water-soluble fraction of bio-oil is to minimize the H2 consumption and carbon loss, while achieving high selectivity of the desired products. The current bio-oil HDO state of the art indicates that there is a wide range of products formed and that the associated catalytic chemistry needs to be understood in more detail. [7][8][9][10][11] The structure of three major polymeric components, cellulose, hemicellulose, and lignin, are well-represented by the bio-oil components in the case of lignocellulosic biomass-derived pyrolysis oil. HDO is usually the preferred method among upgrading processes since it can produce high quality fuels. HDO can improve pyrolysis oil quality through improving oil stability and higher energy density. 12 HDO of the bio-oil involves four major classes of reactions (1) hydrogenation of C-O, C=O, and C=C bonds, (2) dehydration of C-OH groups, (3) C-C bond cleavage by retro-aldol condensation and decarbonylation, and (4) hydrogenolysis of C-O-C bonds. 1,13,14 In most HDO studies, guaiacol (representing the large number of mono-and dimethoxy phenols), 15-17 furfural (representing a major pyrolysis product group from cellulosics), 18-22 and acetic acid (representing a major product from hemicellulose) [23][24][25] have been studied as model compounds of bio-oil. 26,27 These studies indicated that catalyst deactivation is a major challenge during HDO of bio-oil. One of the catalyst deactivation mechanisms that occur during HDO of bio-oil is carbon deposition on the catalyst surface. This deactivation represents a major limit of this technology because the catalyst has to be frequently regenerated. One approach that has been reported is to develop HDO catalysts that have low acidity and hence a lower rate of coke formation. 1,13 The synthesis of an efficient catalyst can play a crucial role in HDO process. 28...

show abstract

Cobalt modified red mud catalytic ozonation for the degradation of bezafibrate in water: Catalyst surface properties characterization and reaction mechanism

Cited by 65 publications

References 46 publications

Catalytic Ozonation by Iron Coated Pumice for the Degradation of Natural Organic Matters

Catalytic Ozonation by Iron Coated Pumice for the Degradation of Natural Organic Matters

Application of Heterogeneous Catalytic Ozonation for Refractory Organics in Wastewater

Hydrodeoxygenation of Aqueous-Phase Catalytic Pyrolysis Oil to Liquid Hydrocarbons Using Multifunctional Nickel Catalyst

Contact Info

Product

Resources

About