title: Kinetics of Solvent Blue and Reactive Yellow removal using microwave radiation in combination with nanoscale zero-valent iron.
abstract: We investigated the efficiency and kinetics of the degradation of soluble dyes over the pH range 5.0-9.0 using a method employing microwave radiation in combination with nanoscale zero-valent iron (MW-nZVI). The nZVI particles (40-70 nm in diameter) were prepared by a liquid-phase chemical reduction method employing starch as a dispersant. Compared to the removal of Solvent Blue 36 and Reactive Yellow K-RN using only nZVI, more rapid and efficient dye removal and total organic carbon removal were achieved using MW-nZVI. The dye removal efficiency increased significantly with decreasing pH, but was negligibly affected by variation in the microwave power. The kinetics of dye removal by MW-nZVI followed both an empirical equation and the pseudo first-order model, while the kinetics of dye removal using nZVI could only be described by an empirical equation. It was also concluded that microwave heating of the dye solutions as well as acceleration of corrosion of nZVI and consumption of Fe(II) were possible reasons behind the enhanced dye degradation.
authors: School of Energy and Power Engineering, Shandong University, Jinan 250100, China. Electronic address: maoyanpeng@sdu.edu.cn.
authors: Yanpeng
authors: Y
authors: Mao
authors: School of Energy and Power Engineering, Shandong University, Jinan 250100, China.
authors: Zhenqian
authors: Z
authors: Xi
authors: School of Energy and Power Engineering, Shandong University, Jinan 250100, China.
authors: Wenlong
authors: W
authors: Wang
authors: School of Energy and Power Engineering, Shandong University, Jinan 250100, China.
authors: Chunyuan
authors: C
authors: Ma
authors: School of Environmental Science and Engineering, Shandong University, Jinan 250100, China. Electronic address: qyyue58@aliyun.com.
authors: Qinyan
authors: Q
authors: Yue
mesh_terms: D000880:Anthraquinones / Q000737:chemistry; D004396:Coloring Agents / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000737:chemistry*; D007700:Kinetics; D053768:Metal Nanoparticles / Q000737:chemistry*; D008872:Microwaves; D013696:Temperature; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D000880:Anthraquinones; D004396:Coloring Agents; D014874:Water Pollutants, Chemical; C018468:1,4-bis(isopropylamino)anthraquinone; D007501:Iron
keywords: Dye; Efficiency; Kinetics; Microwave; nZVI