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摘要
In order to improve the adsorption performance of activated carbon, the activated carbon was modified by thiourea solution under ultrasonic assisted conditions. The effect of gold adsorption under different modification and adsorption conditions was investigated. Field emission scanning electron microscopy (SEM) and Fourier infrared spectrometer (FTIR) were used to characterize pore structure and surface properties of activated carbon before and after modification. The results shows that the optimal modification condition was thiourea solution of 3 mol/L, temperature of 95-100 ℃, time of 3 h, suitable pH value of the adsorption environment of 2-2.5, modified carbon added of 0.5 g, and adsorption time of 1.5 h. Under the toptimal modification condition, the adsorption rate reached 97%. According to the characterization, the activated pore structure of activated carbon was obvious, and the specific surface area increased. The addition of thiourea changed the spectral peaks of the original group, and new groups such as -NH2, C〖FY=,1〗O, C-H, and C〖FY=,1〗S were formed to enhance the adsorption of carbon. The adsorption isotherm of the modified charcoal accorded with the Langmuir and Freundlich isotherm model, showing that the adsorption mode of the modified charcoal was the adsorption mode in which monolayer adsorption dominated with multilayer adsorption. The saturated adsorption capacity after fitting was 0.208 mmol/g and the actual saturated adsorption capacity was (0.194 mmol/g), showing the better adsorption effect ? 2019, Chongqing Functional Materials Periodical Press Co. Ltd. All right reserved.
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