scholarly journals Oxidative Destruction of Organic Pollutants on the Polypropylene Fiber Modified by Nanodispersed Iron

Environments ◽  
2018 ◽  
Vol 5 (7) ◽  
pp. 82 ◽  
Author(s):  
Ludmila Naumova ◽  
Tamara Minakova ◽  
Nikolay Gorlenko ◽  
Irina Kurzina ◽  
Irina Vasenina

This study aims to solve the problem of deep destruction of organic pollutants in industrial effluents by creating new composite materials with prescribed functional properties. This paper researches the possibility of using composites based on a polypropylene fiber under conditions of photocatalytic degradation of organic pollutants in aqueous and aqueous-organic media. Dye that are water soluble (eosin, brilliant green, rhodamine C) and fat-soluble (blue, yellow and red) have been chosen as organic contaminants. Composites based on the polypropylene fiber have been obtained by introducing nanodispersed iron onto the surface of the initial polymer, using ion implantation and super high frequency irradiation methods. The obtained composites are characterized, and their photocatalytic activity is studied with respect to the pollutants under study in the conditions of the Fenton-like system and visible radiation. The results show that the obtained composite materials are effective catalysts for oxidative photodestruction of organic dyes in aqueous and aqueous-organic media, and their decolorization degree reaches 80–100%.

2021 ◽  
Author(s):  
Hugues Kamdem Paumo ◽  
Lebogang Katata-Seru ◽  
Tshepiso Moremedi ◽  
Mpitloane Joseph Hato ◽  
Soumen Sardar ◽  
...  

Water represents one of the essential resources on earth, and all living organisms rely on it for survival. However, freshwater systems are directly under serious threat by human activities. A recent World Health Organization report has estimated that 2 billion people use contaminated water sources. The major organic contaminants in water bodies include organic dyes. These are directly related to the spread of diseases owing to their allergenic, mutagenic, and carcinogenic characteristics. Dyes occur in the environment through untreated industrial effluents. Also, the advancement in human civilisation cannot be considered without the development of modern industries. However, an attempt to limit the resulting impacts of coloured effluents on global freshwater quality has become the focus of recent research. For this reason, the use of efficient, simple, and low-cost methods for the treatment of dyes-containing industrial wastewater could serve as a useful tool. An effort to meet the demand for “green chemistry” and sustainable development has led to several investigations on polysaccharide-based adsorbents. This chapter exposes a critical discussion on the literature concerning the biopolymeric xanthan gum and kappa-carrageenan polysaccharides as adsorbents for dye removal in an aqueous medium. Functionalisation of these biopolymers through graft copolymerisation and inclusion of inorganic nanoparticles for improved adsorption performance is systematically elaborated.


1992 ◽  
Vol 25 (11) ◽  
pp. 403-410 ◽  
Author(s):  
B. E. Rittmann

Microbiological detoxification of hazardous organic pollutants is highly promising, but its reliable implementation requires a sophisticated understanding of several different substrate types and how they interact. This paper carefully defines the substrate types and explains how their interactions affect the bacteria's electron and energy flows, information flow, and degradative activity. For example, primary substrates, which are essential for growth and maintenance of the bacteria, also interact with degradation of specific hazardous pollutants by being inducers, inhibitors, and direct or indirect cosubstrates. The target contaminants, which often are secondary substrates, also have the interactive roles of self-inhibitor, inhibitor of primary-substrate utilization, inducer, and a part of an aggregate primary substrate.


1995 ◽  
Vol 60 (9) ◽  
pp. 1448-1456 ◽  
Author(s):  
Ivo Šafařík ◽  
Miroslava Šafaříková ◽  
Vlasta Buřičová

Magnetic composite based on poly(oxy-2,6-dimethyl-1,4-phenylene) (PODMP) was prepared by melting the polymer with ε-caprolactam in a presence of fine magnetite particles. Magnetic PODMP was used for sorption of water soluble organic compounds (dyes belonging to triphenylmethane, heteropolycyclic and azo dye groups) from water solutions. There were considerable differences in the binding of the dyes tested. In general, heteropolycyclic dyes exhibited the lowest sorption.


Author(s):  
T. G. Ambaye ◽  
M. Vaccari ◽  
E. D. van Hullebusch ◽  
A. Amrane ◽  
S. Rtimi

AbstractCurrently, due to the rapid growth of urbanization and industrialization in developing countries, a large volume of wastewater is produced from industries that contain chemicals generating high environmental risks affecting human health and the economy if not treated properly. Consequently, the development of a sustainable low-cost wastewater treatment approach has attracted more attention of policymakers and scientists. The present review highlights the recent applications of biochar in removing organic and inorganic pollutants present in industrial effluents. The recent modes of preparation, physicochemical properties and adsorption mechanisms of biochar in removing organic and inorganic industrial pollutants are also reviewed comprehensively. Biochar showed high adsorption of industrial dyes up to 80%. It also discusses the recent application and mechanism of biochar-supported photocatalytic materials for the degradation of organic contaminants in wastewater. We reviewed also the possible optimizations (such as the pyrolysis temperature, solution pH) allowing the increase of the adsorption capabilities of biochar leading to organic contaminants removal. Besides, increasing the pyrolysis temperature of the biochar was seen to lead to an increase in its surface area, while it decreases their amount of oxygen-containing functional groups, consequently leading to a decrease in the adsorption of metal (loid) ions present in the medium. Finally, the review suggests that more research should be carried out to optimize the main parameters involved in biochar production and its regeneration methods. Future efforts should be also carried out towards process engineering to improve its adsorption capacity to increase the economic benefits of its implementation.


2021 ◽  
Author(s):  
Sandip Munshi ◽  
Rahul Dev Jana ◽  
Tapan Kanti Paine

The ability of four mononuclear non-heme iron(IV)-oxo complexes supported by nitrogen donor polydentate ligands in degrading organic pollutants has been investigated. The water soluble iron(II) complexes upon treatment with ceric...


2022 ◽  
Vol 2022 ◽  
pp. 1-18
Author(s):  
Avvaru Praveen Kumar ◽  
Dinesh Bilehal ◽  
Tegene Desalegn ◽  
Shalendra Kumar ◽  
Faheem Ahmed ◽  
...  

Degradation of dye pollutants by the photocatalytic process has been regarded as the most efficient green method for removal organic dyes from contaminated water. The current research work describes the synthesis of Fe3O4@SiO2@Ru hybrid magnetic composites (HMCs) and their photocatalytic degradation of two azo dye pollutants, methyl orange (MO) and methyl red (MR), under irradiation of visible light. The synthesis of Fe3O4@SiO2@Ru HMCs involves three stages, including synthesis of Fe3O4 magnetic microspheres (MMSs), followed by silica (SiO2) coating to get Fe3O4@SiO2 MMSs, and then incorporation of presynthesized Ru nanoparticles (~3 nm) onto the surface of Fe3O4@SiO2 HMCs. The synthesized HMCs were characterized by XRD, FTIR, TEM, EDS, XPS, BET analysis, UV-DRS, PL spectroscopy, and VSM to study the physical and chemical properties. Furthermore, the narrow band gap energy of the HMC photocatalyst is a significant parameter that provides high photocatalytic properties due to the high light adsorption. The photocatalytic activity of synthesized Fe3O4@SiO2@Ru HMCs was assessed by researching their ability to degrade the aqueous solution of MO and MR dyes under visible radiation, and the influence of various functional parameters on photocatalytic degradation has also been studied. The results indicate that the photocatalytic degradation of MO and MR dyes is more than 90%, and acid media favors better degradation. The probable mechanism of photodegradation of azo dyes by Fe3O4@SiO2@Ru HMC catalysts has been proposed. Furthermore, due to the strong ferromagnetic Fe3O4 core, HMCs were easily separated from the solution after the photocatalytic degradation process for reuse. Also, the photocatalytic activity after six cycles of use is greater than 90%, suggesting the stability of the synthesized Fe3O4@SiO2@Ru HMCs.


2020 ◽  
Author(s):  
Francisco Jose Alguacil ◽  
Felix A. Lopez

The problem of the treatment of contaminated wastewaters is of the upmost worldwide interest. This contamination occurs via the presence of inorganic or organic contaminants of different nature in relation with the industry they come from. In the case of organic dyes, their environmental impact, and thus, their toxicity come from the air (releasing of dust and particulate matter), solid (scrap of textile fabrics, sludges), though the great pollution, caused from dyes, comes from the discharge of untreated effluents into waters, contributing to increase the level of BOD and COD in these liquid streams; this discharge is normally accompanied by water coloration, which low the water quality, and caused a secondary issue in the wastewater treatment. Among separation technologies, adsorption processing is one of the most popular, due to its versatility, easiness of work, and possibility of scaling-up in the eve of the treatment of large wastewater volumes. Within a miriade of potential adsorbents for the removal of organic dyes, this work presented the most recent advances in the topic.


Author(s):  
А.К. ГОРЕЛКИНА ◽  
И.В. ТИМОЩУК ◽  
Н.С. БАГДОНАС

Изучена стойкость нутриентов молокосырья – белков, лактозы, витаминов С и группы В, используемого в производстве сывороточных напитков в присутствии приоритетных органических контаминантов – трихлорэтилена, хлороформа и дихлорэтана, которые обладают токсическим и канцерогенным действием и образуются при хлорировании в процессе водоподготовки в воде, применяемой для производства восстановленных и рекомбинированных молочных продуктов. Содержание белков, лактозы в восстановленной сыворотке определяли методом рефрактометрии; водорастворимых витаминов – методом капиллярного электрофореза; хлороформа, трихлорэтилена и дихлорэтана – методом газожидкостной хроматографии. Установлено, что хлороформ в воде не оказывает влияния на сохранность лактозы, белков и витаминов при приготовлении восстановленной сыворотки. Отмечено снижение содержания белков сыворотки, приготовленной на воде в присутствии трихлорэтилена и дихлорэтана, на 11%, лактозы – на 32% в сравнении с контрольными образцами, произведенными на воде без органических контаминантов. Содержание витаминов в восстановленной молочной сыворотке в присутствии трихлорэтилена снизилось: С – на 19%, В1 – на 28%, В2 – на 53%, В6 – на 8%; для дихлорэтана содержание витаминов снизилось: С – на 17%, В1 – на 36%, В2 – на 38%, В6 – на 36% в сравнении с контрольными образцами без органических примесей. Теоретически обоснован механизм взаимодействия белков, лактозы, витаминов восстановленной сыворотки с трихлорэтиленом и дихлорэтаном. Предложено для предотвращения снижения качества готового продукта воду, используемую для производства сывороточных напитков, подвергать дополнительной очистке от галогенорганических контаминантов. The stability of milk raw materials’ nutrients – proteins, lactose, vitamins C and B used in the production of whey beverages in the presence of priority organic contaminants – trichloroethylene, chloroform and dichloroethane, which have a toxic and carcinogenic effect and are formed during chlorination during water treatment in water used for the production of reduced and recombined dairy products was studied. The content of proteins and lactose in the reduced serum was determined by refractometry; water-soluble vitamins – by capillary electrophoresis; chloroform, trichloroethylene and dichloroethane – by gas-liquid chromatography. It was found that chloroform in water does not affect the safety of lactose, proteins and vitamins in the preparation of reduced whey. There was a decrease in the content of serum proteins prepared in water in the presence of trichloroethylene and dichloroethane by 11%, and lactose – by 32% in comparison with control samples produced in water without organic contaminants. Vitamin C content in the recovered whey in the presence of trichloroethylene has declined by 19%, vitamin B1 – 28%, vitamin B2 – 53%, vitamin B6 – 8%; for dichloroethane content of vitamin C decreased by 17%, vitamin B1 – 36%, vitamin B2 – 38%, vitamin B6 – 36% in comparison with control samples without organic impurity. The mechanism of interaction of proteins, lactose, and reduced serum vitamins with trichloroethylene and dichloroethane is theoretically justified. Therefore, to prevent a decrease in the quality of the finished product, the water used for the production of whey beverages must first be subjected to additional purification from organohalogen contaminants.


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