标题：Preparation and evaluation of activated carbon with different polycondensed phosphorus oxyacids (H3PO4, H4P2O7, H6P4O13and C6H18O24P6) activation employing mushroom roots as precursor
作者：Cheng, Cheng ;Zhang, Jian ;Mu, Yang ;Gao, Jinhong ;Feng, Yanlin ;Liu, Hai ;Guo, Zizhang ;Zhang, Chenglu
作者机构：[Cheng, Cheng ;Zhang, Jian ;Gao, Jinhong ;Feng, Yanlin ;Liu, Hai ;Guo, Zizhang ;Zhang, Chenglu ] Shandong Key Laboratory of Water Pollution Control an 更多
来源：Journal of Analytical and Applied Pyrolysis
摘要：Orthophosphoric acid (H3PO4), pyrophosphoric acid (H4P2O7), polyphosphoric acid (H6P4O13) and phytic acid (C6H18O24P6) were specially employed as activating agents to produce activated carbons from mushroom roots (MR). Thermogravimetric studies of MR after these phosphorus oxyacids (POA) impregnation indicated the thermal degradation of MR was greatly influenced by different polycondensed POA. The prepared activated carbons were characterized by N2adsorption/desorption isotherms, Fourier-transform infrared spectroscopy (FTIR) and Boehm's titration. The surface area of the carbons was similar but the characteristics of pore volume were different. MRAC-C6H16O24P6owned the largest surface area and micropore volume. MRAC-H3PO4, MRAC-H4P2O7and MRAC-H6P4O13presented a similar micropore volume. MRAC-H6P4O13exhibited a comparatively narrow mesopore distribution around 4 nm. Boehm's titration results indicated that MRAC-C6H16O24P6, MRAC-H6P4O13and MRAC-H4P2O7had much more acidic functionalities than MRAC-H3PO4. MRAC-C6H18O24P6had the highest amount of total acidic surface groups (4.02 mmol/g). Batched sorption studies were also performed to compare adsorptive properties of the carbons toward methylene blue (MB). The sorption capacity of MB follows an order of MRAC-C6H16O24P6MRAC-H6P4O13> MRAC-H4P2O7> MRAC-H3PO4, which may be assigned to the different pore structures and chemical properties. © 2014 Elsevier B.V.