标题：Enhanced adsorption of chromium onto activated carbon by microwave-assisted H3PO4mixed with Fe/Al/Mn activation
作者：Sun, Yuanyuan ;Yue, Qinyan ;Mao, Yanpeng ;Gao, Baoyu ;Gao, Yuan ;Huang, Lihui
作者机构：[Sun, Yuanyuan ;Yue, Qinyan ;Gao, Baoyu ;Gao, Yuan ;Huang, Lihui ] Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, S 更多
来源：Journal of Hazardous Materials
摘要：FeCl3, AlCl3and MnCl2were used as the assisted activation agent in activated carbon preparation by H3PO4activation using microwave heating method. The physico-chemical properties of activated carbons were investigated by scanning electron microscope (SEM), N2adsorption/desorption, Boehm's titration, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). To investigate the adsorption performances of chromium onto these newly developed activated carbons, a batch of experiments were performed under different adsorption conditions: solution pH, initial Cr(VI) ion concentration, contact time and co-existing ions. The results suggested that carbon with MnCl2as assisted activation agent displayed the highest BET surface area (1332m2/g) and the highest pore volume (1.060cm3/g). FeCl3, AlCl3and MnCl2had successfully improved Cr(VI) adsorption and activated carbon with FeCl3as assisted activation agent exhibited the best uptake capacity. To study the transformation of Cr(VI) in adsorption process, total chromium in the aqueous solution was also recorded. The ratio of the amount of Cr(VI) to Cr(III) on each adsorbent was explained by XPS analysis results. Both the co-existing salts (Na2SO4and NaNO3) demonstrated promoted effects on Cr(VI) removal by four carbons. The pseudo-second-order model and Freundlich equation displayed a good correlation with adsorption data. © 2013 Elsevier B.V.