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    Wyświetlanie 1-9 z 9
    Tytuł:
    Chemical Interactions to Cleanup Highly Polluted Automobile Service Station Wastewater by Bioadsorption-Coagulation-Flocculation
    Autorzy:
    Banchon, C.
    Castillo, A.
    Posligua, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/124468.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    adsorption
    agricultural wastes
    bagasse
    coconut coir
    sawdust
    sludge
    Opis:
    The present study addresses an ecofriendly solution to treat automobile service stations effluents with high concentrations of oily substances, surfactants, organic matter and heavy metals. Bioadsorption using sawdust from pine trees, sugar cane bagasse and coconut coir without any chemical modification removed colloidal contamination up to 70%. Polyaluminium chloride, ferric chloride and polyacrylamide were applied to remove dissolved and colloidal pollutants under saline conditions without change of initial pH. Both bioadsorption and coagulation-flocculation removed up to 97.8% of BOD, COD, surfactants and heavy metals at a saline concentration of 1.5% NaCl. The increase of ionic strength promoted a high sludge index and a representative cost saving in chemicals consumption of almost 70%. High levels of pollution removal with the minimal use of chemicals is herein presented.
    Źródło:
    Journal of Ecological Engineering; 2017, 18, 1; 1-10
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization of Physical, Chemical and Mechanical Properties of Sri Lankan Coir Fibers
    Autorzy:
    Dharmaratne, Prasad Dhammika
    Galabada, Harsha
    Jayasinghe, Randika
    Nilmini, Renuka
    Halwatura, Rangika Umesh
    Powiązania:
    https://bibliotekanauki.pl/articles/1838275.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    coir fibre
    characterization
    physical properties
    chemical properties
    mechanical properties
    Opis:
    This study was carried out to determine the characterization of brown coir fiber which is used as a potential reinforcement in polymer composites. The fiber is extracted from the husk of the coconut seeds which are collected in Sri Lanka. Anyhow the above-mentioned characterization can hardly be seen when it comes to the Sri Lankan context. Since the evaluation of their physical, mechanical, and chemical properties are significant before commencing the material development process and applications for this fiber. Several testing were carried out to evaluate the above-mentioned properties. There, the functional groups of coir fiber were obtained by Fourier Transform Infrared analysis and Crystallinity Index and Crystallite size were determined by X-ray diffraction analysis. The surface morphology and cross-sectional features were investigated through Scanning Electron Microscopy. The thermo-gravimetric method was adopted to study the thermal stability of coir fiber. The density and diameter of coir fiber were measured utilizing pychometric method and optical microscope respectively. Tensile strength was measured using an electronic tensometer and then find out the tensile strength, modulus of elasticity, and elongation at breaking point. The average density of brown coir fibers was 1.018 g/cm3 and average diameters were 0.30 mm. The Crystallinity Index and the crystal-line size were 37.28% and 0.4331 nm respectively. Ultimate tensile strength, Young’s modulus, and Elongation of the coir fiber were ranging from 94–159 MPa, 1.2–1.8 GPa, and 21–67%, respectively.
    Źródło:
    Journal of Ecological Engineering; 2021, 22, 6; 55-65
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization of Physical, Chemical and Mechanical Properties of Sri Lankan Coir Fibers
    Autorzy:
    Dharmaratne, Prasad Dhammika
    Galabada, Harsha
    Jayasinghe, Randika
    Nilmini, Renuka
    Halwatura, Rangika Umesh
    Powiązania:
    https://bibliotekanauki.pl/articles/1838380.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    coir fibre
    characterization
    physical properties
    chemical properties
    mechanical properties
    Opis:
    This study was carried out to determine the characterization of brown coir fiber which is used as a potential reinforcement in polymer composites. The fiber is extracted from the husk of the coconut seeds which are collected in Sri Lanka. Anyhow the above-mentioned characterization can hardly be seen when it comes to the Sri Lankan context. Since the evaluation of their physical, mechanical, and chemical properties are significant before commencing the material development process and applications for this fiber. Several testing were carried out to evaluate the above-mentioned properties. There, the functional groups of coir fiber were obtained by Fourier Transform Infrared analysis and Crystallinity Index and Crystallite size were determined by X-ray diffraction analysis. The surface morphology and cross-sectional features were investigated through Scanning Electron Microscopy. The thermo-gravimetric method was adopted to study the thermal stability of coir fiber. The density and diameter of coir fiber were measured utilizing pychometric method and optical microscope respectively. Tensile strength was measured using an electronic tensometer and then find out the tensile strength, modulus of elasticity, and elongation at breaking point. The average density of brown coir fibers was 1.018 g/cm3 and average diameters were 0.30 mm. The Crystallinity Index and the crystal-line size were 37.28% and 0.4331 nm respectively. Ultimate tensile strength, Young’s modulus, and Elongation of the coir fiber were ranging from 94–159 MPa, 1.2–1.8 GPa, and 21–67%, respectively.
    Źródło:
    Journal of Ecological Engineering; 2021, 22, 6; 55-65
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of fibre loading and surface treatment on the impact strength of coir polyester composites
    Autorzy:
    Karthikeyan, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2175809.pdf
    Data publikacji:
    2021
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    coir fibre
    polymer composites
    impact strength
    włókno kokosowe
    kompozyty polimerowe
    udarność
    Opis:
    Purpose: In this work, coir fibre with varying fibre content was selected as reinforcements to prepare polymer-based matrices and the problem of reduced fibre-matrix interfacial bond strength has been diluted by chemical treatment of coir fibres with alkali solution. Design/methodology/approach: The effect of fibre loading, solution concentration and soaking time on the impact strength of the composites were analyzed using statistical techniques. Response Surface Methodology (RSM) approach was used to model and optimize the impact properties of coir-polyester composites. Findings: The impact strength of coir fibre reinforced polyester composite depends mainly on the fabrication parameters such as fibre-polyester content, soaking time, concentration of soaking agent and adhesive interaction between the fibre and reinforcement. Research limitations/implications: The mechanical properties of any coir polyester composite depend on the nature bonding between the fibre and reinforcement. The presence of cellulose, lignin on the periphery of any natural fibre reduces the bonding strength of the composite. This limitation is overcome by fibre treatment over sodium hydroxide to have better impact properties. Practical implications: Now days, natural fibre reinforced composites are capable of replacing automotive parts, subjected to static loads such as engine Guard, light doom, name plate, tool box and front panels etc. These materials can withstand any static load due to its higher strength to weight ratios. Originality/value: The effect of fibre loading, solution concentration and soaking time on the impact strength of the composites were analyzed using statistical techniques. Response Surface Methodology (RSM) approach was used to model and optimize the impact properties of coir-polyester composites. The impact strength of NaOH impregnated coir fibre reinforced polyester composites was evaluated.
    Źródło:
    Archives of Materials Science and Engineering; 2021, 107, 1; 16--20
    1897-2764
    Pojawia się w:
    Archives of Materials Science and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigations on Mechanical Properties of Bio-Waste Micro Particles Reinforced Phenol Formaldehyde Composites
    Autorzy:
    Sujin Jose, A.
    Athijayamani, A.
    Jani, S. P.
    Stalany, Mago V.
    Khan, Adam M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2048760.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wood sawdust particles
    coir pith particles
    hybrid composites
    mechanical properties
    rule of mixture method
    Opis:
    A characteristic study on the phenol formaldehyde (PF) composite is carried out based on the micro level bio waste particles such as wood sawdust (WSD) and coir pith (CP). Composite is characterized by mechanical properties such as tensile, flexural and impact at different percentages of particles (0-50% by weight) to find out the optimum percentage of particle loading to get the maximum properties. The WSD/CP/PF hybrid composite is also prepared by two different methods i.e., one: one (1:1) ratio and rule of mixture. The first method (1:1) is used to find out the optimum level of hybrid particles loading to get the maximum properties. But, the second method is followed to find out the weight percentages of particles influencing the properties of resulting composite. The results show that the mechanical properties of WSD/PF are higher than CP/PF composite in the entire particle loading. The optimum particle loading to get the maximum properties is 40 wt.% in CP/PF composite, whereas for WSD/PF composite are at 30 wt.%. The hybrid composite (1:1) also gives the maximum properties at 30 wt.%. Moreover, the hybrid composite (20WSD/10CP) prepared by rule of mixture showed the highest mechanical properties compared to the other particle loading. It is identified that the WSD particles are most influencing the properties of PF composites than the CP particles. Fractographic study was performed using scanning electron microscope to examine the failure mechanism of the composite specimens.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 1; 377-384
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of coir chemical modification on their sorption of selected heavy metals
    Wpływ modyfikacji chemicznej włókna kokosowego na zdolność sorpcyjną wybranych metali ciężkich
    Autorzy:
    Tomczak, E.
    Szczerkowska, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/387825.pdf
    Data publikacji:
    2012
    Wydawca:
    Towarzystwo Chemii i Inżynierii Ekologicznej
    Tematy:
    coir
    chemical modification
    sorption equilibrium
    heavy metal ions
    włókno kokosowe
    modyfikacja chemiczna
    równowaga sorpcyjna
    metale ciężkie
    Opis:
    The paper presents the results of removal of heavy metals ions from aqueous solution by adsorption. Zn(II), Cd(II), Co(II), Cu(II) and Ni(II) were adsorbed on lignocellulosic sorbent, a natural polymer (concentration range: 20–50 mg/dm3). Sorption capacity was determined for raw and chemically modified coir fibres. Fibre samples activated with 30 % H2O2   solution and 5 % NaOH solution were tested. Fibres modified with sodium hydroxide were found to have the highest sorption capacity. Samples treated with H2O2  were found the least effectiveness. The results showed that the time required to reach equilibrium for most of the metal ions was approximately 5 hours. The equilibrium sorption data for test ions were analyzed using three widely applied isotherms: Redlich–Peterson, Freundlich and Langmuir. Assessment of statistical parameters confirmed that a good fit to experimental data for most of cases was obtained. The test results confirmed that coir is an efficient sorbent for the removal of heavy metals ions from water and that it may be used as an alternative biosorbent for the treatment of contaminated water.
    W pracy zaprezentowano wyniki badań adsorpcyjnego usuwania jonów metali ciężkich z roztworu wodnego. Adsorpcja Zn(II), Cd(II), Co(II), Cu (II) oraz Ni (II) była prowadzona na roślinnym sorbencie – włóknach orzecha kokosowego (zakres stężeń 20–50 mg/dm3). Określono wydajność sorpcyjną dla surowych i modyfikowanych chemicznie włókien. Włókna aktywowano 30 % roztworem H2O2  oraz 5 % roztworem NaOH. Najwyższą pojemność sorpcyjną wykazały włókna modyfikowane NaOH, zaś najmniejszą traktowane H2O2. Równowagę procesu adsorpcji dla większości jonów metali osiągnięto po około 5 h. Do opisu równowagi sorpcji badanych jonów przetestowano trzy równania: Redlicha–Petersona, Freundlicha i Langmuira. Analiza parametrów oceny statystycznej potwierdziła, że we wszystkich przypadkach uzyskano dobre dopasowanie do danych eksperymentalnych. Uzyskane wyniki badań potwierdzają użyteczność włókna kokosowego w procesie usuwania metali ciężkich z wody oraz jego przydatność jako alternatywnego biosorbentu uzdatniającego wodę.
    Źródło:
    Ecological Chemistry and Engineering. A; 2012, 19, 11; 1405-1414
    1898-6188
    2084-4530
    Pojawia się w:
    Ecological Chemistry and Engineering. A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Równowaga sorpcyjna jonów metali ciężkich na sorbentach pochodzenia roślinnego
    Sorption equlibrium of heavy metal ions on plant sorbents
    Autorzy:
    Tomczak, E.
    Szczerkowska, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2071068.pdf
    Data publikacji:
    2010
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    łuska gryczana
    włókno kokosa
    izoterma sorpcji
    równowaga sorpcyjna
    buckwheat husk
    coir
    sorption isotherms
    sorption equilibrium
    Opis:
    Przedmiotem badań była ocena możliwości zastosowania łuski gryki i włókna kokosa do usuwania jonów metali z roztworów pięciosktadniko-wych: Cu(II), Zn(II), Ni(II), Co(II), Cd(II) o stężeniach 10-50 mg/dm3(r = 25°C). Stosowano materiał surowy i modyfikowany. Wyniki sorpcji opisano modelami Freundlicha. Langmuira i Redlicha-Petersona. Oszacowano powierzchnię właściwą sorbentów dla badanych jonów. Stwierdzono użyteczność proponowanych materiałów jako sorbentów ze wskazaniem na łuskę gryczaną.
    The aim of this study was to assess applicability of buckwheat husk and coir to remove metal ions from five-component solutions: Cu(II), Zn (II), Ni (II), Co (II), Cd (II) of concentrations 10-50 mg/dm3 (T= 25°C). Raw and modified material was applied. Sorption results were described by Freundlich, Langmuir and Redlich-Peterson models. Sorbent specific surfaces for given ions were estimated. The materials proposed as sorbents were useful but the most promising was buckwheat husk.
    Źródło:
    Inżynieria i Aparatura Chemiczna; 2010, 1; 115-116
    0368-0827
    Pojawia się w:
    Inżynieria i Aparatura Chemiczna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ modyfikacji chemicznej włókna kokosowego na zdolność sorpcyjną wybranych metali ciężkich
    Effect of coir chemical modification on sorption of selected heavy metals
    Autorzy:
    Tomczak, E.
    Szczerkowska, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/125719.pdf
    Data publikacji:
    2012
    Wydawca:
    Towarzystwo Chemii i Inżynierii Ekologicznej
    Tematy:
    włókno kokosowe
    modyfikacja chemiczna
    równowaga sorpcyjna
    metale ciężkie
    coir
    chemical modification
    sorption equilibrium
    heavy metal ions
    Opis:
    W pracy przedstawiono wyniki badań adsorpcyjnego usuwania jonów metali ciężkich z roztworu wodnego. Separacja Zn(II), Cd(II), Co(II), Cu(II) oraz Ni(II) była prowadzona za pomocą roślinnego sorbentu włókien orzecha kokosowego (zakres stężeń 20÷50 mg/dm3). Określono wydajność sorpcyjną dla surowych i modyfikowanych chemicznie włókien kokosowych. Włókna aktywowano 30% roztworem H2O2 oraz 5% roztworem NaOH. Największą pojemność sorpcyjną wykazały włókna modyfikowane NaOH, zaś najmniejszą traktowane H2O2. Równowagę procesu adsorpcji dla większości jonów metali osiągnięto po około 5 h. Do opisu równowagi sorpcji badanych jonów przetestowano trzy równania: Redlicha-Petersona, Freundlicha i Langmuira. Analiza parametrów oceny statystycznej potwierdziła, że dla wszystkich przypadków uzyskano dobre dopasowanie do danych eksperymentalnych. Otrzymane wyniki badań potwierdzają sorpcyjne właściwości włókna kokosowego w procesie usuwania metali ciężkich z wody oraz jego przydatność jako alternatywnego biosorbentu uzdatniającego wodę.
    The paper presents the results of removal of heavy metals ions from aqueous solution by adsorption. Zn(II), Cd(II), Co(II), Cu(II) and Ni(II) were adsorbed onto lignocellulosic sorbent, a natural polymer (concentration range: 20÷50 mg/dm3). Sorption capacity was determined for raw and chemically modified coir fibres. Fibre samples activated with 30% H2O2 solution and 5% NaOH solution were tested. Fibres modified with sodium hydroxide have been found to have the highest sorption capacity. Samples treated with H2O2 have been found the least effective. The results showed that the time required to reach equilibrium for most of the metal ions was approximately 5 hours. The equilibrium sorption data for test ions were analyzed using three widely applied isotherms: Redlich-Peterson, Freundlich and Langmuir. Analysis of statistical assessment parameters confirmed that obtained a good fit to experimental data for most of cases. The test results have confirmed that coir is an efficient sorbent for the removal of heavy metals ions from water and that it may be used as an alternative biosorbent for the treatment of contaminated water.
    Źródło:
    Proceedings of ECOpole; 2012, 6, 1; 357-365
    1898-617X
    2084-4557
    Pojawia się w:
    Proceedings of ECOpole
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental Investigation of Self-Compacting Concrete Containing Coir Fibres
    Autorzy:
    Lakhiar, Muhammad Tarque
    Lakhiar, Muhammad Tahir
    Abdullah, Abd Halid
    Mohamad, Noridah
    Powiązania:
    https://bibliotekanauki.pl/articles/2051698.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    self-compacting concrete
    coir fibre
    flow
    compressive strength
    split tensile strength
    beton samozagęszczalny
    włókno kokosowe
    przepływ
    wytrzymałość na ściskanie
    wytrzymałość na rozciąganie
    Opis:
    Many researchers have investigated alternative sources to overcome the problem of conventional building material polluting the environment by the development of green self-compacting concrete in the construction industry. The best alternative solution is to utilise non-conventional construction materials like agricultural wastes. Meanwhile, self-compacting concrete (SCC) is considered as high strength as well as high-performance concrete. The demerits, which include tensile and flexural strength, can be improved by incorporating coir fibres. The utilisation of coir fibres also modifies self-compacting concrete performance after cracking and improves the toughness. This study defines an experimental investigation of the mechanical properties of self-compacting concrete containing coir fibres (CF) with different percentages being 0%, 0.2%, 0.5%, 1%, and 1.5% at 7- and 28-days water curing. The mechanical properties include the slump flow and compressive and tensile strength were examined. The outcomes demonstrated that a required slump flow for self-compacting concrete was achieved using coir fibres up to 1%, beyond which it reduced the slump significantly. The length of fibre and proportion of fibres directly affected the workability. The compressive strength was 10% to 15% enhanced with the incorporation of coir fibres up to 0.5%; after that, the strength was slightly reduced, and tensile strength was 30% to 50% improved compared to conventional self-compacting concrete up to 1% of coir fibres incorporation in the SCC mix, after which it rapidly reduced.
    Źródło:
    Civil and Environmental Engineering Reports; 2021, 31, 2; 163-177
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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