Papers by Keyword: Fenton

Abstract: After treating industrial wastewater efficiently and adequately to avoid harm from it being reused and disposed of in the past, the majority of countries in the world have moved to integrated planning and sound management to reuse it. The efficiency of water treatment and reuse depends on a set of environmental standards and controls that are connected to the nature of this water and the eventual purpose of treating and reusing it in order to prevent the environmental repercussions of an integrated method. A framework that assures environmental protection must be employed for this treatment and reuse. The emphasis is on developing reusable resources in order to transition from a linear to a circular economy. Finding the primary pathway for heterogeneous and homogeneous catalysis to pollutant degradation, optimizing the layout for integrating Fenton processes into large-scale treatment plants, particularly its coupling with biological treatment, and analyzing or enhancing heterogeneous catalyst lifetime are all important. are some of the main challenges mentioned in this research. This study intends to analyze the efficacy of the Fenton process in treating water in an effective and economical way compared to other conventional techniques.

Abstract: Methylene orange (MO) is a toxic fabric dye to the environment and health. Therefore, some actions are needed to overcome this problem. The advanced oxidation process (AOPs), especially Fenton by hydrogen peroxide (H₂O₂) and CaO/Fe₂O₃, is a powerful method to be implemented. In this experiment, the CaO/Fe₂O₃ was prepared by impregnation using CaO derived from chicken eggshell waste and Fe(NO₃)₃⸳9H₂O powder with calcination temperature variations of 600, 700, and 800°C. Then, the characterization of materials was identified by Fourier Transform Infrared (FTIR), X-ray diffractometer (XRD), scanning electron microscope (SEM), and electron dispersive spectroscopy (EDS), followed by a visual observation decolorization test. Using FTIR and XRD, CaO has been successfully obtained through the calcination process. Fe₂O₃ was also detected, indicating impregnated into CaO support. The particle size ranges from 37–48 mm, appearing irregular in shape. Finally, the fastest decolorization of MO resulted in CaO/Fe₂O₃ with 800°C of calcination temperature. These results indicated that CaO/Fe₂O₃ nanocomposite catalyst is the potential to reduce liquid pollutants and utilize a waste resource.

Abstract: Fenton process involving Fe²⁺ ions and H₂O₂ produces OH radicals, that act as a strong oxidizing agent for degradation of a variety of organic pollutants. However the process is poor performance at neutral pH limiting its application for industrial wastewater treatment. The short coming problem, in the current study, is solved by introducing ethylene diamine tetra acetic acid (EDTA) as a complexing compound. The degradation was conducted through batch experiment, by varying EDTA concentration and pH. In addition, the Fe²⁺ and H₂O₂ concentrations, and the reaction time were optimized. The research results assign that the addition of EDTA could remarkably enhance the degradation of anionic surfactant, that was 96% at pH 6-8. The increase of the degradation was proportional to the concentrations of EDTA and 6 mg/L showed the optimum level. The highest degradation of 162 mg/L anionic surfactant in 20 mL of the laundry wastewater could be achieved within 30 mins by using Fe²⁺ 10 mM, H₂O₂ 50 mM, and in the pre12sence of EDTA 6 mg/L at pH 7. Key words : Fenton, EDTA, degradation, surfactant, wastewater

Abstract: Among the numerous materials used for dye removal, magnetite is particularly interesting due to its ability to act as an adsorbent and a Fenton catalyst, being easily separable by application of a magnetic field and reusable. Herein, we describe a co-precipitation–based synthesis of magnetite nanoparticles (particle size = 11 nm, surface area = 147.12 m² g^–1) from iron sand and investigate their effectiveness for methylene blue (MB) degradation. The above nanoparticles could promote the decomposition of MB both in the dark (via adsorption) and under UV light irradiation (via Fenton-type degradation), exhibiting the additional advantage of recyclability. Thus, MB degradation efficiencies are 76.32, 76.08, and 68.52% for first, second, and third cycles, respectively, indicating that the prepared magnetic material is a promising recyclable catalyst for the decontamination of dye-containing wastewater. The photo Fenton reactions take to account for reproducibility of MB degradation.

Abstract: Experimental research on the treatment of printing and dyeing wastewater has been carried out. The method of ultrasonic combined Fenton has been used.Separately by using ultrasonic and Fenton oxidation method to treat printing and dyeing wastewater, the hydrogen peroxide dosage, FeSO₄•7H₂O dosage, shaking time, pH value, ultrasonic time, ultrasonic power and other factors are investigated.The COD and chromaticity removal effect of printing and dyeing wastewater are calculated. The experimental results show that the above factors have a certain impact on the treatment effect. Based on these results, the orthogonal test method is used in this experiment, the optimal conditions of ultrasound combined with Fenton reagent for dealing printing and dyeing wastewater has been determined.The orthogonal experimental results show that the optimal reaction conditions of orthogonal test are below:pH value is 3, the best time for the experiment is 1.5h, hydrogen peroxide dosage is 5mL, seven water ferrous sulfate dosage is 0.7grams, ultrasonic power is 142.5W. Experiments are conducted in accordance with the best reaction conditions. On the optimal process conditions, the removal rate of COD reaches 94.6% and the chroma removal rate reaches 87.5%. The effect of using ultrasonic combined with Fenton reagent to treat printing and dyeing wastewater is better than the use of single method.

Abstract: Single crystal diamond is widely used in high-tech fields for its remarkable performance on mechanics, calorifics, optics, acoustics, etc. High-quality diamond surface with small roughness and low scathe are required in these applications. However, the extreme hardness and high chemical inertness of diamond result in severe processing difficulties. Chemical mechanical polishing (CMP) is a promising processing method which can obtain super-smooth and low-damage diamond surface. Oxidant is a key issue for CMP of single crystal diamond. In this study, five different oxidants were used to polish diamond samples. The results indicated that Fenton reagent was an appropriate CMP oxidant and a super-smooth diamond surface of Ra 2.4 nm was achieved by using Fenton reagent in CMP.

Abstract: The experimental treatment of emulsifying wastewater containing fluo- rescent permeating agent is conducted using demulsification, flocculation, sedimentation and Fenton processes. The experimental results show that, under the appropriate conditions, the COD, oil and chromaticity can be removed efficiently. The pH, COD, oil and chromaticity of the outwater can reach the national standards.

Abstract: Fenton reagent was made by CuFeS₂ ultrafine powders with peroxide, and this Fenton reagent can degrade methylene blue solution with 10 mg/L concentration within 1 min. UV-vis spectra were used to investigate this Fenton reagent's degradation activity of methylene blue.

Abstract: Zero-valent iron FENTON-like technology can effectively degrade p-Nitrophenol.The best conditions for experimental study : pH=2~3,PNP initial concentration of 100 mg/L, 30%H₂O₂ dosing volume is 3.0mg/L,zero-valent iron dosing quantity is 4.000g/L,in which after the response time of 20min,the removal rate of PNP achieves more than 95%.

Abstract: This topic used the method of demulsification-Fenton oxidation to deal with the waste emulsion, and analyzed the influencing factors of COD removal efficiency . Experimental results show that when the dosage of demulsifier is 10g/L ,optimum aeration for 1h , dosage of Fe²⁺ is 500mg/L, the dosage of hydrogen peroxide is 50ml/L, After Fenton reagent has oxided for 1.5 h, the COD removal rate can up to 93.4%.