Journal
APPLIED SURFACE SCIENCE
Volume 416, Issue -, Pages 618-627Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2017.04.145
Keywords
Straw activated carbon; As(III); Adsorption; Manganese dioxide; Iron hydroxide
Categories
Funding
- National Natural Science Foundation of China [21201094, 51674131, 21373005]
- Scientific Research Found of Liaoning Provincial Education Department [L2014004]
- Program for Liaoning Excellent Talents in University [LR2015026]
- Liaoning Provincial Department of Education Innovation Team Projects [LT2015012]
- Project supported National Science Technology Ministry [2015BAB02B03]
- Education Bureau of Liaoning Province [LZ2014001]
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Iron hydroxide/manganese dioxide doped straw activated carbon was synthesized for As(III) adsorption. The Fe-Mn-SAc adsorbent has two advantages, on the one hand, the straw active carbon has a large surface area (1360.99 m(2) g(-1)) for FeOOH and MnO2 deposition, on the other hand, the manganese dioxide has oxidative property as a redox potential of (MnO2 + H+)/Mn2+, which could convert As(III) into As(V). Combined with the arsenic species after reacting with Fe-Mn-SAc, the As(III) transformation and adsorption mechanism was discussed. H(2)AsO(4)(-)oxidized from As(III) reacts with the Fe-Mn-SAc by electrostatic interaction, and unoxidized As(III) as H3AsO3 reacts with SAc and/or iron oxide surface by chelation effect. The adsorption was well-described by Langmuir isotherms model, and the adsorption capacity of As(III) was 75.82 mg g(-1) at pH 3. Therefore, considering the straw as waste biomass material, the biosorbent (Fe-Mn-SAc) is promising to be exploited for applications in the treatment of industrial wastewaters containing a certain ratio of arsenic and germanium. (C) 2017 Elsevier B.V. All rights reserved.
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