Heterogeneous Catalytic Process for Wastewater Treatment

Zhang, Ting

doi:10.5772/intechopen.90393

Cited by 6 publications

(6 citation statements)

References 67 publications

(69 reference statements)

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“…In recent years, scientists have been involved in looking for a strategy to allow for total removal of the low concentration of contaminants found in wastewater that was previously treated with conventional removal techniques. Furthermore, it has been observed that using AOPs is a proper option in which the pollutants are adsorbed in a porous material that is removed following in situ AOP reactions; these reactions could take place on the surface of the exhausted adsorbent [24,91,92].…”

Section: Opportunities and Future Perspectivesmentioning

confidence: 99%

Key Principles of Advanced Oxidation Processes: A Systematic Analysis of Current and Future Perspectives of the Removal of Antibiotics from Wastewater

Lupu,

Orbeci,

Bobirică

et al. 2023

Catalysts

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In line with the development of industrial society, wastewater has caused multiple environmental problems. Contaminants of emerging concern (CECs) in water and wastewater are persistent, and for this reason they can cause serious problems for human health, animal health, and the whole environment. Therefore, it is absolutely necessary to apply efficient methods for the treatment of wastewater that has a high concentration of organic compounds. Over recent years, the prescribed and non-prescribed consumption of antibiotics has increased significantly worldwide. Large quantities of antibiotics are discharged into wastewater because of their incomplete absorption by living organisms. However, even small concentrations present in aquatic environments represent a major risk to human health and environment protection. This paper presents the main advantages and disadvantages of advanced oxidation processes, and the current state and new perspectives in the field of environment protection. This study summarizes data from the most recent specialized scientific literature that focuses on the topic of advanced oxidation processes, thus bringing all these aspects to the attention of researchers in a single work that adds comments and interpretations related to the presented processes. Advanced oxidation processes (AOPs) are often used in the treatment of different types of wastewater. AOPs are based on physicochemical processes that create significant structural changes in chemical species. The majority of antibiotics may be eliminated using physicochemical processes, such as photo-Fenton oxidation, photolysis, ozonation, electrooxidation, heterogeneous catalysis, and other bioprocesses. In comparison to conventional chemical processes, AOPs provide superior oxidation efficiency, ideal operating costs, and zero secondary pollutants.

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Section: Opportunities and Future Perspectivesmentioning

confidence: 99%

Key Principles of Advanced Oxidation Processes: A Systematic Analysis of Current and Future Perspectives of the Removal of Antibiotics from Wastewater

Lupu,

Orbeci,

Bobirică

et al. 2023

Catalysts

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“…However, the aromatic structural stability of these organic dyes makes their removal from water challenging, and all of the above methods have their own limitations in an application, but in the treatment of wastewater containing refractory organic materials, advanced oxidation processes (AOPs) have achieved notable advancements. They include photochemical oxidation, electrochemical oxidation, catalytic oxidation, and ozone oxidation, which have the ability to break down and transform poisonous and refractory macromolecular organic materials into safe, harmless, and biodegradable small molecular organic materials …”

Section: Introductionmentioning

confidence: 99%

“…They include photochemical oxidation, electrochemical oxidation, catalytic oxidation, and ozone oxidation, which have the ability to break down and transform poisonous and refractory macromolecular organic materials into safe, harmless, and biodegradable small molecular organic materials. 5 Currently, organic pollutant catalysis is frequently carried out using metal catalysts made of Pt, Pd, Ag, and Au; 6 however, their restricted availability and rising costs limit their use. For these reasons, numerous researchers have recently become interested in easily available and inexpensive catalysts that have high catalytic efficiency and recyclability.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of Kaolin-Supported Nickel Oxide Composites for the Catalytic Oxidative Degradation of Methylene Blue Dye

Mohammed,

Atlabachew,

Aragaw

et al. 2024

ACS Omega

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Organic dye contamination of water is a contributing factor to environmental pollution and has a negative impact on aquatic ecology. In this study, unsupported NiO and kaolin-supported NiO composites were synthesized by a one-step wet impregnation–precipitation method through the precipitation of nickel hydroxide onto locally accessible, inexpensive, and easily treated kaolin surfaces by using sodium hydroxide as a precipitating agent. The product was calcined at 500 °C and used for the catalytic oxidative degradation of methylene blue (MB) dye in an aqueous solution. The morphology, structure, and interactions of the synthesized materials were explored by SEM, XRD, and FT-IR spectroscopy. The characterization results revealed the fabrication and the growth of NiO on the kaolin surface. To determine the catalytic oxidative degradation performance of the catalyst, many experiments have been performed using the MB dye as a model dye. The catalytic degradation tests confirmed the importance of NiO and the high catalytic activity of the synthesized NiO/kaolin composite toward MB dye degradation. The oxidative degradation results showed that the optimized precursor amount on the kaolin surface could efficiently enhance the removal of MB dye. The kinetic investigation of the catalytic degradation of MB dye fitted the pseudo-first-order kinetic model. High removal efficiency was observed after eight reuse cycles, proving the exceptional stability and reusability of the composite. The catalytic process also proceeded with a low activation energy of 30.5 kJ/mol. In conclusion, the kaolin-supported NiO composite was established to be a favorable catalyst to degrade a model dye (MB) from an aqueous solution in the presence of inexpensive and easily available NaOCl with a catalytic efficiency of the material higher than 99% of the 20.3 mg catalyst within 6 min with an apparent rate constant, k app, higher than 0.44625 min–1, which is far better than that of the unsupported catalyst with a k app of 0.0926 min–1 at 10 mg dose in 20 min.

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“…In recent years, due to the need to expand photocatalytic processes for advanced wastewater treatment, new structured and heterostructured thin film semiconductor photocatalytic systems have been proposed for direct use of visible (Vis)- or solar-active catalysts [ 35 , 36 , 37 , 38 , 39 ]. Thin-film (photo)catalysts are an emerging field with considerable potential to be used in the industries because their synthesis is suitable and economic for handling and adapting the catalytic materials’ form for the reactors, in their recycling and recovery [ 35 ]. Beside TiO 2 and ZnO-based multilayered thin film [ 36 , 37 ], α-Fe 2 O 3 thin films on Si(100) and SrTiO 3 substrates thin films were investigated for photocatalytic dye degradation [ 38 , 39 ].…”

Section: Introductionmentioning

confidence: 99%

Magnetic Core-Shell Iron Oxides-Based Nanophotocatalysts and Nanoadsorbents for Multifunctional Thin Films

et al. 2022

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In recent years, iron oxides-based nanostructured composite materials are of particular interest for the preparation of multifunctional thin films and membranes to be used in sustainable magnetic field adsorption and photocatalysis processes, intelligent coatings, and packing or bio-medical applications. In this paper, superparamagnetic iron oxide (core)-silica (shell) nanoparticles suitable for thin films and membrane functionalization were obtained by co-precipitation and ultrasonic-assisted sol-gel methods. The comparative/combined effect of the magnetic core co-precipitation temperature (80 and 95 °C) and ZnO-doping of the silica shell on the photocatalytic and nano-sorption properties of the resulted composite nanoparticles were investigated by ultraviolet-visible (UV-VIS) spectroscopy monitoring the discoloration of methylene blue (MB) solution under ultraviolet (UV) irradiation and darkness, respectively. The morphology, structure, textural, and magnetic parameters of the investigated powders were evidenced by scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectroscopy, Brunauer–Emmett–Teller (BET) measurements, and saturation magnetization (vibrating sample magnetometry, VSM). The intraparticle diffusion model controlled the MB adsorption. The pseudo- and second-order kinetics described the MB photodegradation. When using SiO2-shell functionalized nanoparticles, the adsorption and photodegradation constant rates are three–four times higher than for using starting core iron oxide nanoparticles. The obtained magnetic nanoparticles (MNPs) were tested for films deposition.

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Heterogeneous Catalytic Process for Wastewater Treatment

Cited by 6 publications

References 67 publications

Key Principles of Advanced Oxidation Processes: A Systematic Analysis of Current and Future Perspectives of the Removal of Antibiotics from Wastewater

Key Principles of Advanced Oxidation Processes: A Systematic Analysis of Current and Future Perspectives of the Removal of Antibiotics from Wastewater

Synthesis of Kaolin-Supported Nickel Oxide Composites for the Catalytic Oxidative Degradation of Methylene Blue Dye

Magnetic Core-Shell Iron Oxides-Based Nanophotocatalysts and Nanoadsorbents for Multifunctional Thin Films

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