Nanoscale Zero-Valent Iron Supported on Biochar: Characterization and Reactivity for Degradation of Acid Orange 7 from Aqueous Solution

作者：Quan, Guixiang; Sun, Wenji; Yan, Jinlong; Lan, Yeqing^*

来源：Water, Air, and Soil Pollution, 2014, 225(11): 2195.

DOI：10.1007/s11270-014-2195-3

• Nanoscale zero-valent iron
• Biochar
• Synthesis and characterization
• Acid orange 7
• Removal

The nanoscale zero-valent iron supported on biochar (B-nZVI) was prepared by liquid-phase reduction method and used for the removal of acid orange 7 (AO(7)). The structure of composited B-nZVI was characterized by transmission electron microscopy, scanning electron microscopy, X-ray diffraction analysis, X-ray photoelectron spectroscopy, and Brunauer-Emmett-Teller surface area analysis. nZVI was well dispersed on the surface of biochar with a specific surface area 52.21 m(2)/g, and no obvious aggregation was observed. Batch experiments demonstrated that the degradation of AO(7) (20 mg/L) by B-nZVI (2 g/L) at initial pH 2 reached 98.3 % within 10 min. There was a good linearity (r(2)=0.99) between k(obs) and B-nZVI dosage. The reductive cleavage of the azo group in AO(7) to amino group may be the dominant stage. This study demonstrated that B-nZVI has the potential to be a promising material for the removal of azo dyes.

• 出版日期2014-11
• 单位南京农业大学; 盐城工学院