《Table 4 Content of the surface acid oxygen function groups of ACs》

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《Enhancement of gaseous mercury(Hg~0) adsorption for the modified activated carbons by surface acid oxygen function groups》

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In this study，we use granular activated carbon（Calgon Carbon Co.Ltd.BPL）to prepare modified activated carbon，as shown in the parameters of Table 1.The modification method is as follows:Taking granular activated carbon，soaking them in deionized water at 100°C for 1 h；then after heating and drying，the particles are ground into size of 100-200 mesh by a sealed sample preparation pulverizer to obtain powdered activated carbon，which is recorded as BPL and then placed in a tube furnace for calcination in an inert gas atmosphere N2；the heating process is as follows:Firstly heated to 1 000°C at 10°C/min，then calcined at 1 000°C for 2 h，and finally cooled to room temperature at 10°C/min，and recorded the sample as BPL1000.Then mix 1.00 g of BPL1000 with different concentrations of benzoic acid solution，which is vibrated for 24 h at25 oC at 125 r/min，filtered to obtain activated carbon filter cake，and dried at 105°C，that is，benzoic acid modified activated carbon，referred to as BPLCXs；and then use a spectrophotometer（Thermo Electron Corporation，Genesys 10UV）to detect the concentration of residual benzoic acid in the filtrate atλ=270 nm.The calculated reduction of benzoic acid in the solution is the loading amount of benzoic acid on the surface of activated carbon.The loading amount is shown in Table 2: