Adsorptive removal of ciprofloxacin and isoniazid from aqueous solution
- Dube, Cyril S, Tandlich, Roman, Wilhelmi, Brendan S
- Authors: Dube, Cyril S , Tandlich, Roman , Wilhelmi, Brendan S
- Date: 2018
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/76846 , vital:30629 , https://doi.org/10.2478/nbec-2018-0002
- Description: This paper describes study of ciprofloxacin and isoniazid removal from aqueous solutions using coal fly ash (FA), kaolinite, perlite, talc and vermiculite. The adsorptive features of the adsorbents were evaluated for ciprofloxacin and isoniazid with regards to the effects of contact time, pH, the solid/liquid ratio and antibiotic concentration. All adsorbents were sterilised by dry heat before use to avoid the proliferation of antimicrobial resistance by the bacteria present on the adsorbents during experiments. The regression correlation coefficients indicate that the Langmuir model gives the best fit for the sorption of both antibiotics onto FA and talc, ciprofloxacin onto kaolinite, and isoniazid onto perlite and vermiculite with R2 values ranging from 0.908 – 0.999. The Freundlich isotherm best describes the sorption of ciprofloxacin onto vermiculite and isoniazid onto kaolinite with R2 values of 0.999 for both. The Tempkin model best describes the sorption of ciprofloxacin onto perlite with an R2 = 0.997. The values of the Freundlich exponent, 1/n, range from 0.221 – 0.998, indicating a favourable adsorption of ciprofloxacin and isoniazid onto the adsorbents. The heat of sorption, B, calculated from the Temkin plots has values ranging from 0.018 – 10.460 J/mol, indicating a physical adsorption process (physisorption). Adsorption equilibrium was achieved after 30 min for both antibiotics and the kinetic data obtained conforms best to the pseudo-second order equation with R2 values ranging from 0.998 – 0.999. The removal of ciprofloxacin and isoniazid by all adsorbents except FA was strongly influenced by the pH suggesting that electrostatic interactions play a major role in the adsorption processes.
- Full Text:
- Authors: Dube, Cyril S , Tandlich, Roman , Wilhelmi, Brendan S
- Date: 2018
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/76846 , vital:30629 , https://doi.org/10.2478/nbec-2018-0002
- Description: This paper describes study of ciprofloxacin and isoniazid removal from aqueous solutions using coal fly ash (FA), kaolinite, perlite, talc and vermiculite. The adsorptive features of the adsorbents were evaluated for ciprofloxacin and isoniazid with regards to the effects of contact time, pH, the solid/liquid ratio and antibiotic concentration. All adsorbents were sterilised by dry heat before use to avoid the proliferation of antimicrobial resistance by the bacteria present on the adsorbents during experiments. The regression correlation coefficients indicate that the Langmuir model gives the best fit for the sorption of both antibiotics onto FA and talc, ciprofloxacin onto kaolinite, and isoniazid onto perlite and vermiculite with R2 values ranging from 0.908 – 0.999. The Freundlich isotherm best describes the sorption of ciprofloxacin onto vermiculite and isoniazid onto kaolinite with R2 values of 0.999 for both. The Tempkin model best describes the sorption of ciprofloxacin onto perlite with an R2 = 0.997. The values of the Freundlich exponent, 1/n, range from 0.221 – 0.998, indicating a favourable adsorption of ciprofloxacin and isoniazid onto the adsorbents. The heat of sorption, B, calculated from the Temkin plots has values ranging from 0.018 – 10.460 J/mol, indicating a physical adsorption process (physisorption). Adsorption equilibrium was achieved after 30 min for both antibiotics and the kinetic data obtained conforms best to the pseudo-second order equation with R2 values ranging from 0.998 – 0.999. The removal of ciprofloxacin and isoniazid by all adsorbents except FA was strongly influenced by the pH suggesting that electrostatic interactions play a major role in the adsorption processes.
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Igniting public space at the Chale Wote street art festival in Accra:
- Authors: Simbao, Ruth K
- Date: 2018
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/147048 , vital:38588 , https://theconversation.com/igniting-public-space-at-the-chale-wote-street-art-festival-in-accra-102783
- Description: For the past eight years at the end of every August the James Town suburb of Ghana’s capital Accra has been taken over by the Chale Wote street art festival. During the festival, thousands of people, including local celebrities, artists, musicians, boxers and everyday revellers, move up and down the streets mostly by foot and at times on roller skates or unicycles.
- Full Text:
- Authors: Simbao, Ruth K
- Date: 2018
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/147048 , vital:38588 , https://theconversation.com/igniting-public-space-at-the-chale-wote-street-art-festival-in-accra-102783
- Description: For the past eight years at the end of every August the James Town suburb of Ghana’s capital Accra has been taken over by the Chale Wote street art festival. During the festival, thousands of people, including local celebrities, artists, musicians, boxers and everyday revellers, move up and down the streets mostly by foot and at times on roller skates or unicycles.
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Installation view: Chale Wote Festival 2018
- Authors: Simbao, Ruth K
- Date: 2018
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/147059 , vital:38589 , https://www.contemporaryand.com/magazines/chale-wote-festival-accra-2018/
- Description: The Chale Wote festival opened on the Day of Re-Membering (20 August), when the Nai Priest poured libations at Brazil House in order to invoke the ancestral spirits. Core events took place on the streets and at various public spaces in James Town from 25 – 26 August. A number of artists including Kiffouly Youchaou, Kresiah Mukwazhi, Va-Bene Elikem Fiatsi (crazinisT artisT), Charlotte Brathwaite, Percy Nii Nortey and the Ubulungiswa/Justice collective created works inside Ussher Fort and James Fort, which were built as slave forts by the Dutch and the British.
- Full Text:
- Authors: Simbao, Ruth K
- Date: 2018
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/147059 , vital:38589 , https://www.contemporaryand.com/magazines/chale-wote-festival-accra-2018/
- Description: The Chale Wote festival opened on the Day of Re-Membering (20 August), when the Nai Priest poured libations at Brazil House in order to invoke the ancestral spirits. Core events took place on the streets and at various public spaces in James Town from 25 – 26 August. A number of artists including Kiffouly Youchaou, Kresiah Mukwazhi, Va-Bene Elikem Fiatsi (crazinisT artisT), Charlotte Brathwaite, Percy Nii Nortey and the Ubulungiswa/Justice collective created works inside Ussher Fort and James Fort, which were built as slave forts by the Dutch and the British.
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The energy transition patterns of low-income households in South Africa: an evaluation of energy programme and policy
- Israel-Akinbo, Sylvia O, Snowball, Jeanette D, Fraser, Gavin C G
- Authors: Israel-Akinbo, Sylvia O , Snowball, Jeanette D , Fraser, Gavin C G
- Date: 2018
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/69397 , vital:29518 , https://doi.org/10.17159/2413-3051/2018/v29i3a3310
- Description: The transition to modern energy carriers like electricity is an important way to achieve to eradicate energy poverty. This study investigated energy transition patterns and trends in low-income South African households. The marginal effects of the different determinants on the probability of choosing a specific energy carrier were computed and the influence of some endogenous characteristics in transitioning to modern energy carriers was explored. It was found that energy ladder behaviour exists for cooking while energy stacking was most likely for space heating and the pattern for lighting tended towards energy stacking. Dwelling type, household size and geographical location were among the key determinants of the energy transition pattern. Policies to reduce energy poverty need a multi-pronged approach and not only a focus on electricity access.
- Full Text:
- Authors: Israel-Akinbo, Sylvia O , Snowball, Jeanette D , Fraser, Gavin C G
- Date: 2018
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/69397 , vital:29518 , https://doi.org/10.17159/2413-3051/2018/v29i3a3310
- Description: The transition to modern energy carriers like electricity is an important way to achieve to eradicate energy poverty. This study investigated energy transition patterns and trends in low-income South African households. The marginal effects of the different determinants on the probability of choosing a specific energy carrier were computed and the influence of some endogenous characteristics in transitioning to modern energy carriers was explored. It was found that energy ladder behaviour exists for cooking while energy stacking was most likely for space heating and the pattern for lighting tended towards energy stacking. Dwelling type, household size and geographical location were among the key determinants of the energy transition pattern. Policies to reduce energy poverty need a multi-pronged approach and not only a focus on electricity access.
- Full Text:
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