کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5350482 1503553 2017 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Arsenic transformation and adsorption by iron hydroxide/manganese dioxide doped straw activated carbon
ترجمه فارسی عنوان
تبدیل و جذب آرسنیک توسط کربن فعال کربن نیترات هیدروکسید آهن / کربن دی اکسید منگنز
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
چکیده انگلیسی


- A waste straw adsorbent doped by iron hydroxide/manganese dioxide was synthesized.
- It exhibited excellent performance of adsorption at pH 3.
- It is applied in the recovery and separation of arsenic from germanium.

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 m2 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. H2AsO4−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.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Surface Science - Volume 416, 15 September 2017, Pages 618-627
نویسندگان
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