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    Wyświetlanie 1-6 z 6
    Tytuł:
    Manufacturing of activated carbon using disposable coconut shells
    Autorzy:
    Aluvihara, Suresh
    Kalpage, C. S.
    Bandaranayake, P. W. S. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1031548.pdf
    Data publikacji:
    2020
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Activated carbon
    Burning temperature
    Coconut shells
    Industrial Applications
    Metallic composition
    Opis:
    Activated carbon is a solid carbon compound that is composed of carbon in the form of charcoal. It plays a major role in some industrial applications such as water and air purification because of the strong adsorption of its surfaces and its tendency to remove some volatile organic compounds (VOC) and most of contaminants from the water, air or some other material. Various base materials are used in the manufacturing of activated carbon, including different woods and certain synthetic materials. According to the scope of new research, it is possible to produce activated carbon economically using coconut shell waste products. In our work, the coconut shells were burnt using a muffle furnace and at a range of temperatures in 300 ºC - 390 ºC. The elemental compositions of manufactured activated carbon were analyzed using X-ray fluorescence (XRF) spectrophotometer, while the surfaces of manufactured activated carbon were microscopically analyzed using an optical microscope. Thus, the range of 330 ºC - 350 ºC was considered as the most adequate temperatures for the manufacturing process of activated carbon from these coconut shells. Beyond the non-metal carbon, 68.85% Fe and 31.15% K are generated.
    Źródło:
    World News of Natural Sciences; 2020, 31; 25-35
    2543-5426
    Pojawia się w:
    World News of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization and feasibility of biomass fuel pellets made of Colombian timber, coconut and oil palm residues regarding European standards
    Autorzy:
    Forero Núnez, C. A.
    Jochum, J.
    Sierra Vargas, F. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/363258.pdf
    Data publikacji:
    2012
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie
    Tematy:
    biomass
    coconut shells
    oil palm shells
    pellets
    renewable energy
    biomasa
    energia odnawialna
    orzech kokosowy
    palma olejowa
    skorupa
    owoc
    Opis:
    Strong correlation between economic development, energy demand and fossil fuels utilization during last decades has caused some negative impacts worldwide, based on it, the renewable resources for energy production should be employed to mitigate these effects. Nowadays, biomass is one of the most prominent renewable sources, but factors such as low density and high moisture content are some drawbacks. In order to overcome these problems, some companies use different types of biomass to provide solid biofuels with higher energy density, mechanical resistance and standardized dimensions. Wood pellet industry has increased exponentially during last years, faster than timber industries; therefore, new raw materials should be evaluated to guarantee pellets demand in the near future. Some of them are agricultural residues. Colombia is a country with an interesting potential for biomass production because there is a rising generation of agricultural products. This work aims to assess main properties of Colombian timber industry residues, coconut shells and oil palm shells and compare the characteristics of pellets made from these raw materials with European standards. Pellets made from these feedstocks have an average density between 850 and 1025kg·m-3, low ash contents and heating values around 18000kJ·kg-1. Coconut shell pellets have low compression ratios and problems during pretreatment; whereas, sawdust, wood shavings and oil palm shell pellets proved to be an attractive opportunity for pellet industry development in Colombia.
    Źródło:
    Environmental Biotechnology; 2012, 8, 2; 67-76
    1734-4964
    Pojawia się w:
    Environmental Biotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Recycling of Waste Coconut Shells as Substitute for Aggregates in Mix Proportioning of Concrete Hollow Blocks
    Autorzy:
    Ganiron Jr, Tomas U.
    Ucol-Ganiron, Nieves
    Ganiron III, Tommy U.
    Powiązania:
    https://bibliotekanauki.pl/articles/1178350.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Coconut shells
    construction materials
    hollow blocks
    recycled materials
    technical specification
    Opis:
    Due to the environmental and economic crisis, this study focus on generating product using agricultural waste as well develop an alternative construction material that will lessen the social and environmental issues. It also paved the way to the recognition of using coconut shells and fiber as a substitute for aggregates in developing concrete hollow blocks. As a whole, the study' main concern is the environment and the construction and building technology to enhance natural world as well as building materials. This also aims to design a technical specification of concrete hollow block using coconut shell and fiber as aggregates that will meet the ASTM requirements in order to help contribute to the industry in saving the environment, to encourage the government to find solutions regarding the disposal to landfills of waste materials and save the environment, to provide new knowledge to the contractors and developers on how to improve the construction industry methods and services by using recycled coconut shells and fibers, and to sustain good product performance and meet recycling goals. A conventional concrete hollow block was compared to concrete hollow blocks with coconut shells and fibers of the same proportions. Observations from the tests performed were conducted in the laboratory where precise data were gathered and completely attained. Some of the interesting insights of the study are: (a) coconut shells and fibers are applicable as a partial substitute as coarse aggregates for concrete hollow blocks. (b) the good indicators of coconut shell and fiber quality as aggregate of concrete hollow blocks are particles, shape, and texture, resistance to crushing, absorption and surface moisture, grading, resistance to freezing and heating and light-weight.; (c) coconut shells and fibers are classified as miscellaneous material used for wall panels and partitions and (d) a non-load bearing type of hollow block because the compressive strength gained higher than the conventional concrete hollow blocks after 28th days
    Źródło:
    World Scientific News; 2017, 77, 2; 107-123
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Use of Coconut Shells for the Removal of Dyes from Aqueous Solutions
    Autorzy:
    Jóźwiak, T.
    Filipkowska, U.
    Bugajska, P.
    Kalkowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/124295.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    sorption
    coconut shells
    anionic dyes
    cationic dyes
    Opis:
    The main purpose of the work was to check the possibility of using coconut shells for the removal of the dyes popular in the textile industry from aqueous solutions. The sorption abilities of an unconventional sorbent were tested against four anionic dyes: Reactive Black 5, Reactive Yellow 84, Acid Yellow 23, Acid Red 18 as well as two cationic dyes: Basic Violet 10 and Basic Red 46. The scope of research included investigation pertaining to the effect of pH on the effectiveness of sorption of dyes, conducted in order to determine the time of equilibrium of sorption and determine the maximum sorption capacity of coconut shells with respect to pigments. The most favorable pH of sorption for the anionic dyes and Basic Violet 10 was pH 3 and for Basic Red 46 – pH 6. The equilibrium time of sorption was the shortest in the case of acidic dyes (Acid Yellow 23/ Acid Red 18 – 45 min), while the longest in the case of alkaline dyes (Basic Red 46 – 90 min, Basic Violet 10 – 180 min). The sorption capacity of coconut shells in relation to anionic dyes was for Reactive Black 5 – 0.82 mg/g, Reactive Yellow 84 – 0.96 mg/g, Acid Yellow 23 – 0.53 mg/g and for Acid Red 18 – 0.66 mg/g. The tested sorbent showed much higher sorption capacity with respect to the cationic dyes, i.e. Basic Violet 10 (28.54 mg/g) and Basic Red 46 (68.52 mg/g).
    Źródło:
    Journal of Ecological Engineering; 2018, 19, 4; 129-135
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Activated Carbons from the Compressed Plant Materials (Coconut Shell) and Copolymers of Furfural
    Aktywny węgiel z materiałów roślinnych (łupiny kokosowe) oraz kopolimery z furoaldehydu
    Autorzy:
    Kishibayev, K. K.
    Kabulov, A. T.
    Tokpayev, R. R.
    Atchabarova, A. A.
    Yefremov, S. A.
    Voropaeva, N. L.
    Nechipurenko, S. V.
    Nauryzbayev, M. K.
    Tasibekov, K. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/318592.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    węgiel aktywny
    sorbent
    kopolimery z furoaldehydu
    łupiny kokosowe
    mezopory
    mikropory
    powierzchnia właściwa
    aktywacja sorpcyjna przez cyjankowe związki złota
    activated carbon
    furfural copolymers
    coconut shells
    mesopores
    micropores
    specific surface
    sorption activity by cyanide complex of the gold
    Opis:
    This paper dwells upon the physical and chemical properties of activated carbons based on compressed plant materials (coconut shell) and on furfural copolymers, the paper also gives the results of their elemental analysis by ICP-MS method, the structure and morphology of the obtained sorbents have been determined by scanning electron microscopy. The specific surface of the obtained activated carbons has shown that a sorbent based on coconut shell has the highest specific surface (Sspecific surface = 1100 m2/g) if compared to the sorbent based on copolymers of furfural (Sspecific surface = 653 m2/g). However, the sorbent based on furfural copolymers has a higher mechanical resistance to abrasion (98%) and a low ash content (0.3%) compared to the indices of the sorbent based on coconut shell (mechanical strength = 92%, ash content = 2.5%). The study of the structure and morphology of the obtained activated carbons has shown that within the structure of the sorbent based on the copolymers of furfural mesopores predominate together with micropores, when in the structure of the sorbents based on coconut shells micropores are mostly predominant. The elemental analysis of the adsorbents has shown that they are mainly composed of carbon, but there were also some trace amounts of some other elements.
    Artykuł dotyczy fizycznych i chemicznych właściwości aktywnego węgla z materiałów roślinnych (łupiny kokosowe) oraz kopolimerów z furoaldehydu. Ponadto przedstawiono w artykule wyniki ich składów pierwiastkowych uzyskanych za pomocą metody ICP-MS a także struktury i morfologii otrzymanych sorbentów za pomocą elektronowego mikroskopu skaningowego. Powierzchnia właściwa otrzymanego aktywnego węgla wykazała, że sorbent bazujący na skorupach kokosowych ma największą powierzchnię właściwą (Sspecific surface = 1100 m2/g) porównując ją z sorbentem opartym na kopolimerach z furoaldehydu (Sspecific surface = 653 m2/g). Jednakże, sorbent oparty o kopolimery z furoaldehydu mają większą odporność na abrazję (98%) i niską zawartość popiołu (0.3%) w porównaniu do wskaźników sorbentu opartego o łupiny kokosowe (wytrzymałość mechaniczna = 92%, zawartość popiołu = 2.5%). Badanie struktury i morfologii otrzymanego węgla aktywnego wykazało, że wewnątrz struktury sorbentu opartego na kopolimerach z furo aldehydu jest równie wiele mezoporów, jak i mikroporów, podczas gdy struktura sorbentów bazujących na łupinach kokosowych jest zdominowana głownie przez mikropory. Analiza pierwiastkowa adsorbentów wykazała, że są one głównie złożone z węgla, ale zawierają również nieco śladowych ilości innych pierwiastków.
    Źródło:
    Inżynieria Mineralna; 2016, R. 17, nr 1, 1; 181-188
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of grain size on the physicomechanical properties
    Autorzy:
    Ossia, C. V.
    Big-Alabo, A.
    Ekpruke, E. O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1831342.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    brake pad
    coconut shells
    grain size
    physicomechanical characterization
    klocek hamulcowy
    skorupy kokosa
    wielkość ziarna
    charakterystyka fizykomechaniczna
    Opis:
    In this study, locally available waste coconut (Cocos nucifera) shells (CSs) were investigated as possible replacement for asbestos-based brake pads. The CS-based brake pad was tested for its physicomechanical properties and compared with a commercial brake pad used as control sample. The results showed that (a) an improved interfacial bonding between the CS particles and the binder as the grain size decreases; (b) the 90 μm grain size sample had better physicomechanical properties than the control sample in all tests except the thermal conductivity and stability tests; and (c) the hardness, compressive strength, and density of the CS-based brake pad decreased with increasing grain size, whereas the absorption properties increased with increasing grain size. The study showed that further reduction of the grain size below 90 μm and matrix impregnation with metals of good thermal conductivity could provide significant improvements to properties of the CS-based brake pad.
    Źródło:
    Advances in Manufacturing Science and Technology; 2020, 44, 4; 135-144
    0137-4478
    Pojawia się w:
    Advances in Manufacturing Science and Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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