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Full-Text Articles in Physical Sciences and Mathematics
Encapsulated Chitosan-Modified Magnetic Carbon Nanotubes For Aqueous-Phase Crvi Uptake, Mian Muhammad-Ahson Aslam, Walter Den, Hsion-Wen Kuo
Encapsulated Chitosan-Modified Magnetic Carbon Nanotubes For Aqueous-Phase Crvi Uptake, Mian Muhammad-Ahson Aslam, Walter Den, Hsion-Wen Kuo
Water Resources Science and Technology Faculty Publications
This work demonstrates the performance of a composite adsorbent encapsulated with chitosan (CS) and maghemite-doped multiwall carbon nanotubes (MWCNTs). Hexavalent chromium (CrVI) was used as the representative hazardous heavy metal to characterize the adsorption behavior of the composite beads. The chromium speciation chemistry combined with the chitosan surface chemistry rendered pH at 4 to be the optimized condition in which the uptake of CrVI was quantitatively most effective. The Langmuir isotherm with a maximum adsorption capacity of 119 mg g−1 at 298 K was observed. The CrVI adsorption studies using partial compositions of the beads …
Simultaneous Cr(Vi) Reduction And Methylene Blue Removal By Bacillus Sp. Jh2-2 Isolated From Mining Site Soil, Jaehong Shim, Patrick Shea, Jeong-Muk Lim, Byung-Taek Oh
Simultaneous Cr(Vi) Reduction And Methylene Blue Removal By Bacillus Sp. Jh2-2 Isolated From Mining Site Soil, Jaehong Shim, Patrick Shea, Jeong-Muk Lim, Byung-Taek Oh
School of Natural Resources: Faculty Publications
A Bacillus sp. strain (JH2-2), isolated from soil at an abandoned mine site, reduced Cr(VI) to Cr(III) under aerobic conditions. At pH 7, the strain reduced essentially all of the Cr(VI) in M9 minimal medium to Cr(III) at initial concentrations ≤50 mg Cr(VI) L−1 within 100 h. The X-ray diffraction pattern of the Cr(III) precipitate matched chromium (III) hydrogen phosphate (CrH2P3O10∙2H2O). The JH2-2 strain showed high tolerance to other heavy metal (loid)s, with minimal inhibitory concentrations in liquid medium of (mg L−1): As (500), Cd (100), Cu (350), Ni (300), Zn …