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H3PO4 and NaOH Treated Canola Straw Biochar for Arsenic Adsorption
It is known that arsenic is remarkably toxic and can be found in high concentrations in a variety of natural waters and wastewaters both in Canada and worldwide. Thus, it is important to adequately treat these waters, with removal using adsorption methods being promising due to their simplicity, effectiveness, and relatively low costs. Agricultural residues are abundant in Saskatchewan, Canada, and can be utilized as an inexpensive biomass to produce adsorbents. In this study, biochar prepared from a raw canola straw biomass was investigated for its arsenate, As(V), and arsenite, As(III) adsorption capacities after being modified using phosphoric acid (H3PO4) and sodium hydroxide (NaOH). The biomass was treated prior to being converted into biochar using a prepyrolysis method. Canola straw biochar (CSB) was made through both conventional and microwave pyrolysis methods and a variety of different pretreatment parameters were explored including varying H3PO4 and NaOH to biomass ratios. Studying the effect of acid or base to biomass ratio suggested that the highest H3PO4 and NaOH ratio led to higher adsorption for both As(III) (10.59 µg/g and 12.46 µg/g, respectively) and As(V) (12.65 µg/g and 16.69 µg/g, respectively). Furthermore, varying solution pH at values of 3, 7, and 10 demonstrated that H3PO4 and NaOH CSB had markedly increased adsorption capacity at pH 7 for As(V). Overall, H3PO4 and NaOH CSB showed marginal adsorption enhancements for As(III) and As(V).
H3PO4 and NaOH Treated Canola Straw Biochar for Arsenic Adsorption
It is known that arsenic is remarkably toxic and can be found in high concentrations in a variety of natural waters and wastewaters both in Canada and worldwide. Thus, it is important to adequately treat these waters, with removal using adsorption methods being promising due to their simplicity, effectiveness, and relatively low costs. Agricultural residues are abundant in Saskatchewan, Canada, and can be utilized as an inexpensive biomass to produce adsorbents. In this study, biochar prepared from a raw canola straw biomass was investigated for its arsenate, As(V), and arsenite, As(III) adsorption capacities after being modified using phosphoric acid (H3PO4) and sodium hydroxide (NaOH). The biomass was treated prior to being converted into biochar using a prepyrolysis method. Canola straw biochar (CSB) was made through both conventional and microwave pyrolysis methods and a variety of different pretreatment parameters were explored including varying H3PO4 and NaOH to biomass ratios. Studying the effect of acid or base to biomass ratio suggested that the highest H3PO4 and NaOH ratio led to higher adsorption for both As(III) (10.59 µg/g and 12.46 µg/g, respectively) and As(V) (12.65 µg/g and 16.69 µg/g, respectively). Furthermore, varying solution pH at values of 3, 7, and 10 demonstrated that H3PO4 and NaOH CSB had markedly increased adsorption capacity at pH 7 for As(V). Overall, H3PO4 and NaOH CSB showed marginal adsorption enhancements for As(III) and As(V).
H3PO4 and NaOH Treated Canola Straw Biochar for Arsenic Adsorption
Lecture Notes in Civil Engineering
Gupta, Rishi (editor) / Sun, Min (editor) / Brzev, Svetlana (editor) / Alam, M. Shahria (editor) / Ng, Kelvin Tsun Wai (editor) / Li, Jianbing (editor) / El Damatty, Ashraf (editor) / Lim, Clark (editor) / Norberto, Julia (author) / Benis, Khaled Zoroufchi (author)
Canadian Society of Civil Engineering Annual Conference ; 2022 ; Whistler, BC, BC, Canada
Proceedings of the Canadian Society of Civil Engineering Annual Conference 2022 ; Chapter: 65 ; 1019-1032
2023-08-17
14 pages
Article/Chapter (Book)
Electronic Resource
English
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