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Asia Pacific Academy of Science Pte. Ltd. (APACSCI) specializes in international journal publishing. APACSCI adopts the open access publishing model and provides an important communication bridge for academic groups whose interest fields include engineering, technology, medicine, computer, mathematics, agriculture and forestry, and environment.
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2024
by
Kediemetse Mothibedi, Samuel Chigome, Ntebogeng Mokgalaka-Fleischmann, James Darkwa
Pollut. Stud.
2024
,
5(1);
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Abstract
The main objective of the study was to characterize raw (RFA), water-washed (WFA) and iron-modified (Fe-WFA) Botswana coal fly ash to determine the physical and chemical properties as well as investigate its potential use as adsorbents for the removal of arsenic(III) ((As(III)) from fortified water. Scanning electron microscopy with an energy dispersive spectrometer (SEM-EDS) showed particles with irregular size and shape for all the materials and porous iron oxide flakes for Fe-WFA. The SEM-EDS, X-ray diffraction analysis (XRD) and X-ray photoelectron spectroscopy (XPS) showed the main constituents of RFA, WFA and Fe-WFA to be SiO 2 , Fe 2 O 3 , Al 2 O 3 and CaO. The XPS further showed the surface composition of Fe-WFA with higher Fe content at 19.7% compared to 0.8% and 1.2% for RFA and WFA respectively. The XRF and XRD results confirmed the successful modification of WFA with iron by showing the Fe 2 O 3 composition increasing from 12.6% of WFA to 25.5% for Fe-WFA. The inductively coupled plasma-mass spectrometry (ICP-MS) results showed continuous reduction of metal concentrations for WFA and Fe-WFA from the first to the sixth wash. The adsorption of As(III) on the adsorbents followed the Freundlich adsorption model. The maximum adsorption capacities of 0.85, 0.02 and 2.26 mgg −1 were obtained for RFA, WFA and Fe-WFA respectively.
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Editor-in-Chief
Prof. Jesus Simal Gandara
Food Science, the University of Vigo, Spain
News & Announcements
The 7th IMDC will be held in Busan
The 7th International Marine DebrisConference (7IMDC) will take place from the 18th to the 23rd of September 2022 in Busan, Republic of Korea. The 7IMDC is being organized by an Executive Committee comprised of the Ministry of Oceans and Fisheries of the Republic of Korea (MOF) and the United Nations Environment Programme (UNEP), with the organizational support of the Korea Marine Environment Management Corporation (KOEM), and the technical support of U.S. National Oceanic and Atmospheric Administration (NOAA).
Posted: 2022-08-10
UNEP today announced its 2021 Champions of the Earth
7 December 2021, The UN Environment Programme (UNEP) today announced its 2021 Champions of the Earth. The Champions were chosen for their transformative impact on the environment and their leadership in advancing bold and decisive action on behalf of people and the planet. This year’s award recognizes laureates in the four categories of Inspiration and Action, Policy Leadership, Entrepreneurial Vision, and Science and Innovation.
Figure 1. @UNEP/Roan Paul
Posted: 2022-06-07