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• W3089329083 endingPage "128409" @default.
• W3089329083 startingPage "128409" @default.
• W3089329083 abstract "Biochar has become a popular research topic in sustainable chemistry for use both in agriculture and pollution abatement. To enhance aqueous Cr(VI), Pb(II) and Cd(II) removal efficiency, high surface area (535 m2/g) byproduct Douglas fir biochar (DFBC) from commercial syn-gas production obtained by fast pyrolysis (900–1000 °C, 1–10 s), was subjected to a KOH activation. KOH-activated biochar (KOHBC) underwent a remarkable surface area increase to 1049 m2/g and a three-fold increase in pore volume (BET analysis). Batch sorption studies on KOHBC verses pH revealed that the highest chromium, lead and cadmium removal capacities occurred at pH 2.0, 5.0 and 6.0, respectively. KOHBC exhibited much higher adsorption capacities than unactivated DFBC. Heavy metal loadings onto KOHBC were characterized by scanning electron microscopy, transmission electron microscopy and X-ray photoelectron spectroscopy. Sorption of Cr(VI), Pb(II) and Cd(II) all followed pseudo-second order kinetics and the Langmuir adsorption model. The highest Langmuir adsorption capacities at the respective pH’s of maximum adsorption were 140.0 mg g−1 Pb(II), 127.2 mg g-1 Cr(VI) and 29.0 mg g−1 Cd(II). Metal ions spiked into natural and laboratory waste water systems exhibited high sorption capacities. Desorption studies carried out using 0.1 M HCl revealed that Pb(II) adsorption onto the KOHBC surface is reversible. Portions of Cd(II) and Cr(VI) adsorbed strongly onto KOHBC were unable to be desorbed by 0.1 M HCl and 0.1 M NaOH." @default.
• W3089329083 created "2020-10-01" @default.
• W3089329083 creator A5012050389 @default.
• W3089329083 creator A5020005432 @default.
• W3089329083 creator A5046379512 @default.
• W3089329083 creator A5054635980 @default.
• W3089329083 creator A5089090842 @default.
• W3089329083 creator A5089237843 @default.
• W3089329083 date "2021-04-01" @default.
• W3089329083 modified "2023-10-11" @default.
• W3089329083 title "KOH-activated high surface area Douglas Fir biochar for adsorbing aqueous Cr(VI), Pb(II) and Cd(II)" @default.
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