Thermal treated zeolite as catalyst in heterogeneous catalytic ozonation – optimization of experimental conditions and micropollutants degradation

2020 ◽  
Author(s):  
Anastasios Zouboulis ◽  
Savvina Psaltou ◽  
Efthimia Kaprara ◽  
Manassis Mitrakas
Keyword(s):  
Catalytic Ozonation ◽  
Experimental Conditions ◽  
Heterogeneous Catalytic ◽  
Optimization Of Experimental Conditions

scholarly journals Transition Metal Ions as Ozonation Catalysts: An Alternative Process of Heterogeneous Catalytic Ozonation

Catalysts ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1091
Author(s):  
Savvina Psaltou ◽  
Konstantina Sioumpoura ◽  
Efthimia Kaprara ◽  
Manassis Mitrakas ◽  
Anastasios Zouboulis
Keyword(s):  
Catalytic Activity ◽  
Metal Ions ◽  
Natural Water ◽  
Transition Metal Ions ◽  
Catalytic Ozonation ◽  
Experimental Conditions ◽  
Chlorobenzoic Acid ◽  
Heterogeneous Catalytic ◽  
Water Matrix ◽  
Phosphate Ions

The aim of this study is to elucidate the mechanism of micropollutants’ removal in drinking water by the application of catalytic ozonation, using transition metals as appropriate catalysts. For that purpose, the degradation of 500 μg/L of p-chlorobenzoic acid (p-CBA) and benzotriazole with the addition of 2 mg/L of ozone in the presence of 1 mg/L of Co(II) or Fe(II) and at pH 7.8 were examined. It was found that in distilled water experiments, both metal ions can be characterized as catalysts, enhancing the ozonation process; however, in the natural water matrix, only iron presented higher removal rates of examined organic pollutants, when compared to single ozonation. The metal ions present catalytic activity, when they can form precipitates, hence converting the initially homogeneous process of catalytic ozonation towards a heterogeneous one. However, when 2 mg/L of ozone was applied in natural water experiments, Co(II)—unlike Fe(II)—could not be oxidized into its trivalent form, hence it cannot precipitate as Co(OH)3. Therefore, under these experimental conditions, this metal was not found to present any catalytic activity. Nevertheless, the addition of phosphates (PO43−) in concentrations higher than 100 mg/L can increase the oxidation ability of the Co(II)/O3 system, due to the resulting sufficient formation of Co3(PO4)2 precipitates. Although cobalt can enhance the •OH production (and therefore, the ozonation procedure) under these conditions, the relatively highly added concentration of phosphate ions makes the treated water non-potable, resulting in the application of further treatment to remove the excess phosphates. Therefore, only Fe(II) can be considered as a sufficient catalyst to enhance the ozonation processes.

Removing 2,4-dichlorophenol from aqueous environments by heterogeneous catalytic ozonation using synthesized MgO nanoparticles

2017 ◽  
Vol 76 (11) ◽  
pp. 3054-3068 ◽  
Author(s):  
Leili Mohammadi ◽  
Edris Bazrafshan ◽  
Meissam Noroozifar ◽  
Alireza Ansari-Moghaddam ◽  
Farahnaz Barahuie ◽  
...  
Keyword(s):  
Catalytic Ozonation ◽  
Continuous Reactor ◽  
Maximum Effect ◽  
Surface Model ◽  
Solution Ph ◽  
Experimental Conditions ◽  
Mgo Nanoparticles ◽  
Heterogeneous Catalytic ◽  
Paper Manufacturing ◽  
Aqueous Environments

Abstract 2,4-Dichlorophenol (2,4-DCP) is one of the seriously toxic chlorophenol compounds found in agricultural environments, in water disinfected by chlorine, and in outgoing effluents from the pulp and paper industries and paper manufacturing factories. This research studied the feasibility of using MgO nanoparticles (MgO-NPs) as a catalyst in the ozonation process for removing 2,4-DCP from aqueous environments under laboratory conditions. This study was conducted using a laboratory-scale semi-continuous reactor. It studied the effects of critical variables such as solution pH, ozonation time, dose of MgO-NPs and initial 2,4-DCP concentration. A statistical model of response surface model (RSM) was designed and utilized to obtain the optimum experimental conditions. Analysis of the data showed that initial concentration of 2,4-DCP and dose of MgO-NPs had the maximum effect on the response variable (percentage degradation of 2,4-DCP). Moreover, based on analysis of variance on the model, the optimum removal conditions were reaction time of 50 min, pH > 7, initial 2,4-DCP concentration of less than 50 mg/L, and an MgO-NPs dose of 0.3 mg/L. Under these optimum conditions, a removal efficiency of 99.99% was achieved. In addition, results indicated that catalytic ozonation in the presence of MgO-NPs was very efficient at removing 2,4-DCP from aqueous environments.

scholarly journals Enhanced catalytic ozonation of ibuprofen using a 3D structured catalyst with MnO2 nanosheets on carbon microfibers

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Guhankumar Ponnusamy ◽  
Hajar Farzaneh ◽  
Yongfeng Tong ◽  
Jenny Lawler ◽  
Zhaoyang Liu ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Active Sites ◽  
Low Cost ◽  
Three Dimensional ◽  
Industrial Applications ◽  
Catalytic Ozonation ◽  
Heterogeneous Catalytic ◽  
Structured Catalyst ◽  
Dimensional Network ◽  
Carbon Microfibers

AbstractHeterogeneous catalytic ozonation is an effective approach to degrade refractory organic pollutants in water. However, ozonation catalysts with combined merits of high activity, good reusability and low cost for practical industrial applications are still rare. This study aims to develop an efficient, stable and economic ozonation catalyst for the degradation of Ibuprofen, a pharmaceutical compound frequently detected as a refractory pollutant in treated wastewaters. The novel three-dimensional network-structured catalyst, comprising of δ-MnO2 nanosheets grown on woven carbon microfibers (MnO2 nanosheets/carbon microfiber), was synthesized via a facile hydrothermal approach. Catalytic ozonation performance of Ibuprofen removal in water using the new catalyst proves a significant enhancement, where Ibuprofen removal efficiency of close to 90% was achieved with a catalyst loading of 1% (w/v). In contrast, conventional ozonation was only able to achieve 65% removal efficiency under the same operating condition. The enhanced performance with the new catalyst could be attributed to its significantly increased available surface active sites and improved mass transfer of reaction media, as a result of the special surface and structure properties of this new three-dimensional network-structured catalyst. Moreover, the new catalyst displays excellent stability and reusability for ibuprofen degradation over successive reaction cycles. The facile synthesis method and low-cost materials render the new catalyst high potential for industrial scaling up. With the combined advantages of high efficiency, high stability, and low cost, this study sheds new light for industrial applications of ozonation catalysts.

Heterogeneous catalytic ozonation of p-chloronitrobenzene (pCNB) in water with iron silicate doped hydroxylation iron as catalyst

2017 ◽  
Vol 89 ◽  
pp. 81-85 ◽  
Author(s):  
Yue Liu ◽  
Shiyuan Wang ◽  
Weijin Gong ◽  
Zhonglin Chen ◽  
Haifang Liu ◽  
...  
Keyword(s):  
Catalytic Ozonation ◽  
Iron Silicate ◽  
Heterogeneous Catalytic

Production of clinoptilolite nanorods by glow discharge plasma technique for heterogeneous catalytic ozonation of nalidixic acid

RSC Advances ◽  
2016 ◽  
Vol 6 (25) ◽  
pp. 20858-20866 ◽  
Author(s):  
Alireza Khataee ◽  
Tannaz Sadeghi Rad ◽  
Mehrangiz Fathinia ◽  
Sang Woo Joo
Keyword(s):  
Glow Discharge ◽  
Nalidixic Acid ◽  
Discharge Plasma ◽  
Catalytic Ozonation ◽  
Glow Discharge Plasma ◽  
Acid Degradation ◽  
Heterogeneous Catalytic ◽  
Plasma Technique

This study investigates nalidixic acid degradationviaheterogeneous catalytic ozonation using clinoptilolite nanorods (CNs) as a novel nanocatalyst.

scholarly journals Application of Heterogeneous Catalytic Ozonation for Refractory Organics in Wastewater

Catalysts ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 241 ◽  
Author(s):  
Bing Wang ◽  
Huan Zhang ◽  
Feifei Wang ◽  
Xingaoyuan Xiong ◽  
Kun Tian ◽  
...  
Keyword(s):  
Metal Oxides ◽  
Advanced Oxidation Processes ◽  
Carbon Materials ◽  
Catalytic Ozonation ◽  
Pollutant Removal ◽  
Oxidation Processes ◽  
Heterogeneous Catalytic ◽  
The Past ◽  
Theoretical Support ◽  
Refractory Organics

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.

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