- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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Toward Concurrent Organics Removal and Potential Hydrogen Production in Wastewater Treatment: Photoelectrochemical Decolorization of Methylene Blue over Hematite Electrode in the Presence of Mn(II)
摘要： A sustainable system capable of simultaneous removal of organic contaminants and hydrogen generation in wastewater treatment operation was studied using hematite electrode in the presence of Mn(II), PEC-Mn(II), as a proof of concept. The photoelectrochemical (PEC) system exhibited methylene blue (MB) decolorization threefold faster than that of photo-Fenton processes and yielded comparable photocurrent density to relative to the control system, i.e., PEC water splitting in the absence of MB at otherwise identical operation conditions. Furthermore, the advantages of PEC-Mn(II) system were no H2O2 addition, hydrogen production potential, and ease in Mn(II) separation via the formation of MnO2 precipitates during wastewater treatment operations. The PEC-Mn(II) process is a promising and sustainable approach toward wastewater treatment with the capability of concurrent photochemical energy generation. Moreover, the PEC-Mn(II) process can be an emerging energy-from-wastewater alternative in addition to other systems such as microbial fuel cell and anaerobic digestion.
关键词： Wastewater Treatment,Decolorization,Sustainability,Photoelectrochemical,Hydrogen production
更新于2025-09-10 09:29:36
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Gallium Oxide || Ga2O3-photoassisted decomposition of insecticides
摘要： Recent years have witnessed an ever increase in the production of many insecticides that contain fluorine and/or trifluoromethyl groups [1]. These fluorinated chemicals have excellent physicochemical characteristics such as, adsorption, hydrophobicity, thermal chemical stability, and bioactivity [2]. Accordingly, they have attracted intense investigations and have been applied in various fields [3]. Reports have appeared regarding contamination of common insecticides, health risks, and pollutant-treatment systems. However, scant research is being carried out on the decomposition of fluorinated substances. The perfluorinated chemicals such as perfluorooctanoic acid (PFOA) and the perfluorooctanesulfonate (PFOS) surfactant were produced by DuPont in the United States in 1947. Seven decades have elapsed since their developments [4]. PFOA and PFOS have also been used in firefighting water sprays in great amounts resulting in the worldwide contamination of aquatic environments. Because the quantities used were low in the beginning, people failed to recognize the potential hazards of these perfluorinated chemicals. Yet recently the production has increased considerably with its inevitable serious ecological and environmental results caused by the use of these fluorinated chemicals.
关键词： photocatalytic degradation,wastewater treatment,fluorinated chemicals,Ga2O3,insecticides
更新于2025-09-09 09:28:46
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Nanohybrid and Nanoporous Materials for Aquatic Pollution Control || Nanohybrid Photocatalysts for Heavy Metal Pollutant Control
摘要： In this decade, the environmental problem, especially for the wastewater treatment issue, has become a widespread concern. In the meantime, heavy metal pollutants have also caused great attention owing to their recalcitrance persistence and the large discharge scale into the environment. Heavy metal is defined as the element with the atomic weights between 63.5 and 200.6. In our environment, some hazardous heavy metals such as chromium (Cr), mercury (Hg), arsenic (As), lead (Pb), copper (Cu), nickel (Ni), etc. exist in the surface fresh water. Heavy metals tend to accumulate in the organism via the food chain and caused serious harm to the organism. Therefore, it is urgent for the worldwide researchers to find effective treatment strategies to remove heavy metal from wastewater.
关键词： Environmental Remediation,Photocatalysis,Wastewater Treatment,Nanohybrid Photocatalysts,Heavy Metal Pollutant Control
更新于2025-09-04 15:30:14
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A Cross‐linked Conjugated Polymer Photosensitizer Enables Efficient Sunlight‐induced Photooxidation
摘要： Photooxidation under sunlight has great potentials in organic synthesis, bacterial killing, organic waste treatment, etc. Photosensitizers (PSs) often play a very important role in this process. High 1O2 generation efficiency and excellent photostability under sunlight, as well as easy recyclability are ideal properties for PSs used for photooxidation, which are not easy to achieve simultaneously. Herein, a pure organic porous conjugated polymer PS of CPTF was designed and synthesized to show great photostability, large specific surface area and high 1O2 generation efficiency under sunlight for photooxidation in different applications. Taking the oxidation of aromatic aldehyde to aromatic acid as an example, the PS catalyst shows excellent recyclability, which enables solvent-free reactions in high yields both under direct sunlight and simulated AM1.5G irradiation. In addition, the successful application of CPTF in bacterial killing and organic waste decomposition under simulated AM1.5G irradiation indicates the potential of CPTF in sunlight-induced waste water treatment.
关键词： singlet oxygen,sunlight-induced organic synthesis,photooxidation,photosensitizers,sunlight-induced wastewater treatment
更新于2025-09-04 15:30:14
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Facile Synthesis of Ag/ZnO Photocatalysts on the Degradation of Diuron Herbicide Under Simulated Solar Light and the Investigation of Its Antibacterial Activity for Waste-Water Treatment
摘要： Nanocrystalline Ag/ZnO powders have been successfully prepared by a modified polyol process using triethylene-glycol (TEG) as solvent, reducing and stabilizing agent. The synthesis procedure has been conducted without any post-synthesis thermal treatment. The structural and optical properties have been characterized by X-ray diffraction, transmission electron microscopy, N2 adsorption study, inductively coupled plasma optical emission spectroscopy and UV–Vis diffuse reflectance spectroscopy. The photocatalytic activity of Ag/ZnO materials has been studied by analyzing the degradation of an herbicide, diuron, under solar light. Ag/ZnO photocatalysts with optimized x = 0.7% Ag content showed 14 times higher rate of degradation than that of unmodified ZnO. We attribute these observations to the addition of silver nanoparticles allowing interfacial oxide-to-metal electron transfer within the hybrid Ag/ZnO photocatalyst. The inhibitory and bactericidal activities of samples have been tested against Gram-negative bacteria; Escherichia coli, Salmonella typhimurium and gram-positive bacteria; Staphylococcus aureus, Enterococcus faecium and Candida albicans. The results showed that the Ag/ZnO can be used as photocatalysts and antibacterial agents for potential practical applications in the wastewater treatment.
关键词： Nanoparticles,Photocatalysis,Antibacterial,ZnO,Wastewater treatment,Ag
更新于2025-09-04 15:30:14
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Facile Synthesis of Visible Light-Induced g-C3N4/Rectorite Composite for Efficient Photodegradation of Ciprofloxacin
摘要： A novel kind of g-C3N4/rectorite composite with high visible-light photoactivity was developed via a mild and cost effective two-step process. Cipro?oxacin (CIP), a typical antibiotic, was applied to evaluate the photoactivity of the received catalysts. Furthermore, the by-products of CIP photodegradation were analyzed and the possible degradation pathways were also discussed. Compared with bare photocatalysts, the received composite possessed well reusability and higher photoactivity towards CIP. According to the characterization analysis results, layered g-C3N4 was successfully immobilized on layered rectorite, which could not only promote its adsorption capacity but also provide more reactive sites for CIP adsorption and photodegradation. Compared with bare g-C3N4, the photoactivity of the prepared composite was signi?cantly enhanced. The enhancement should be mainly due to the lower recombination rate of photogenerated carriers and the improved adsorption capacity toward CIP. This study demonstrated that the obtained g-C3N4/rectorite composite should be a promising alternative material in wastewater treatment.
关键词： rectorite,wastewater treatment,photocatalysis,cipro?oxacin,g-C3N4
更新于2025-09-04 15:30:14
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Accelerated photocatalytic oxidation of carbamazepine by a novel 3D hierarchical protonated g-C3N4/BiOBr heterojunction: performance and mechanism
摘要： A novel 3D hierarchical heterojunction of protonated g-C3N4/BiOBr was fabricated by a facile precipitation method with the protonation pretreatment of g-C3N4. The material was characterized by X-ray spectrometer (SEM), transmission electron microscopic (TEM), high resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), UV-vis reflectance spectra (UV-Vis DRS) and Brunauer-Emmett-Teller (BET). The photocatalytic activity was systematically evaluated by the degradation of carbamazepine (CBZ) under simulated solar light irradiation. The protonated g-C3N4/BiOBr with mass ratios of 5 wt% (pgB-5) achieved the optimum performance for the CBZ removal and excellent stability. The effects of some key operating parameters were further examined in detail, including photocatalyst dosage, initial solution pH, coexisting inorganic anions (HCO3-, Cl-, NO3-). The enhanced activity was ascribed to the effective charge separation occurring at the tightly contacted interface between two phases, which was revealed by electrochemical impedance spectroscopy (EIS) and photocurrent. Basing on direct evidence of the formed hydroxyl radicals (·OH), superoxide radicals (·O2-) and holes (h+) by electron spin resonance (ESR), the photocatalytic mechanism was proposed for the charge separation. The reaction intermediates were determined by liquid chromatography coupled with mass spectrometry (LC-MS) and a tentative degradation pathway of CBZ was proposed. This study provided a new insight for the design of novel 3D hierarchical heterojunctions and the degradation of recalcitrant organic contaminants in aquatic environment.
关键词： Photocatalysis,Operation parameters,Pharmaceuticals,Wastewater treatment,Heterojunction
更新于2025-09-04 15:30:14
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“Titanium Oxide-Clay” as Adsorbent and Photocatalysts for Wastewater Treatment
摘要： A novel composite based on Titanium oxide and clays hydrothermally was synthesized to be used as substrate in advanced treatment of wastewaters. The treatment consists of one single step process combining photocatalysis and adsorption. The composite’s crystalline structure is investigated by X-ray diffraction and FTIR, while atomic force microscopy (AFM) and scanning electron microscopy (SEM) are used to analyze the surface morphology. The adsorption capacity and photocatalytic properties of the material are tested on pollutants matrix containing dye (Methylene Blue) and heavy metal (cadmium cation). The results under optimized conditions indicate a good removal efficiency using this novel composite material.
关键词： Cadmium cation,Methylene blue,Wastewater treatment,Nanocomposite
更新于2025-09-04 15:30:14
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A Cross-linked Conjugated Polymer Photosensitizer Enables Efficient Sunlight-induced Photooxidation
摘要： Photooxidation under sunlight has great potentials in organic synthesis, bacterial killing, organic waste treatment, etc. Photosensitizers (PSs) often play a very important role in this process. High 1O2 generation efficiency and excellent photostability under sunlight, as well as easy recyclability are ideal properties for PSs used for photooxidation, which are not easy to achieve simultaneously. Herein, a pure organic porous conjugated polymer PS of CPTF was designed and synthesized to show great photostability, large specific surface area and high 1O2 generation efficiency under sunlight for photooxidation in different applications. Taking the oxidation of aromatic aldehyde to aromatic acid as an example, the PS catalyst shows excellent recyclability, which enables solvent-free reactions in high yields both under direct sunlight and simulated AM1.5G irradiation. In addition, the successful application of CPTF in bacterial killing and organic waste decomposition under simulated AM1.5G irradiation indicates the potential of CPTF in sunlight-induced waste water treatment.
关键词： photooxidation,singlet oxygen,photosensitizers,sunlight-induced organic synthesis,sunlight-induced wastewater treatment
更新于2025-09-04 15:30:14