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RISS 인기검색어
- 검색키워드
- 저자 : El-Salamony, Radwa A. (검색결과 1 건)
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Younis, Sherif A.,El-Salamony, Radwa A.,Tsang, Yiu Fai,Kim, Ki-Hyun Elsevier 2020 Journal of Cleaner Production Vol.250 No.-
<P><B>Abstract</B></P> <P>The formation of hard mineral scale deposits (e.g., celestite (SrSO<SUB>4</SUB>) and barite (BaSO<SUB>4</SUB>)) is the most common problem that hinders sustainable operations of water-flooded oilfield and desalination systems (i.e., membrane fouling) when using poor quality water contaminated with barium (Ba(II)) and strontium (Sr(II)) ions. In this work, nanoscale biochar (∼53–712 nm) was synthesized from waste rice straw (cost = 380 to 560 ± 27 US$/Ton; n = 9) and applied as a protective approach against the formation of mineral scale deposits via adsorptive removal of Ba(II)/Sr(II) contaminants from 30,000 ppm saline wastewater. Adsorption of Ba(II)/Sr(II) ions onto biochar was investigated and optimized as a function of biochar amount, water pH, contact time, temperature, and Sr(II)/Ba(II) ratio using response surface methodology. Based on kinetic and isotherm analyses, the biochar exhibited enhanced potential to capture Sr(II)/Ba(II) ions <I>via</I> weak ion-exchange or pore-filling mechanisms (sorption energy (E)≈ 0.61–0.89 kJ/mol). A comparison of partition coefficient (PC) values verified that sorption of Sr(II) onto biochar is far superior to that of Ba(II) (PCs of 10.1 and 2.5 μmol g<SUP>−1</SUP> μM<SUP>−1</SUP>, respectively). Sorption selectivity was mainly dependent on solution pH and the metallic properties of Ba(II)/Sr(II)(e.g., metal size, speciation, and mobility). Quantitative analysis of treated saline water using electrical conductivity and ion chromatography confirmed the ability of biochar sorbent to remove Ba(II) and Sr(II) ions (97.5%) with pre-desalination (e.g., total salts reduction of 25.7% after 48 h). It is thus recommended to utilize the prepared biochar as a promising pre-desalinating adsorptive medium to inhibit mineral scale formation before oilfield water flooding in the petroleum field and membrane desalination systems.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Rice straw-driven nanoscale biochar effectively removed barium/strontium sulfate scales. </LI> <LI> Adsorption was studied in saline water using a response surface methodology. </LI> <LI> Biochar exhibited higher uptake selectivity for Sr<SUP>2+</SUP> than Ba<SUP>2+</SUP> in terms of partition coefficient. </LI> <LI> Pre-desalting of saline water by biochar was confirmed analytically. </LI> <LI> Weak ion exchange and pore-filling mechanisms best described the sorption process. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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