载钼活性炭的制备、表征及其苯吸附性能

doi:10.3969/j.issn.0253-2417.2018.03.004

Abstract

Abstract: Mo-loaded activated carbon materials (Mo/AC) with high adsorption performance for gaseous benzene were prepared by modification of coconut shell based activated carbon with ammonium molybdate tetrahydrate aqueous solution. The modified activated carbons were labeled as AC-1, AC-2, AC-3, and AC-4 to represent molybdenum salt solutions with the mass fractions of 0.1%, 0.3%, 0.5%, and 0.7%, respectively. Mo/AC was characterized by means of nitrogen adsorption isotherm, SEM, XRD, and XPS. Dynamic studies of gaseous benzene adsorption at room temperature were carried out. The results showed that element molybdenum existed on the surface of activated carbon in the form of MoO₃. Specific surface area and total pore volume of the modified activated carbon were improved after modification, among them, those of AC-2 were the largest with the values of 1 372.12 m²/g and 0.74 cm³/g respectively, but the average pore size did not change much and remained at about 2.16 nm. Ether and carboxyl groups on the surface of activated carbon decreased obviously. With the increase of impregnation mass fractions of molybdenum salt, the adsorption capacity of gaseous benzene increased, but it showed degradation when the mass fractions exceeded 0.3%. As the mass fractions of (NH₄)₆Mo₇O₂₄·4H₂O was 0.3%, the modified activated carbon AC-2 had the most excellent adsorption capacity with the equilibrium adsorption capacity of 332.80 mg/g, which increased by 24.55% compared to that of the original one (267.20 mg/g), and the theoretical adsorption time was as high as 110.93 min, which was 24.54% higher than that of the original carbon. After 5 cycles of adsorption, the equilibrium adsorption capacity of AC-2 still reached 306.99 mg/g, and the theoretical adsorption time was 101.27 min.

Key words: activated carbon, ammonium molybdate tetrahydrate, impregnation, gaseous benzene, adsorption

CLC Number:

TQ35

TONG Guobin, XU Zhou, LI Wei, LIU Shouxin. Preparation,Characterization and Gaseous Benzene Adsorption Performance of Mo-loaded Activated Carbon[J]. Chemistry and Industry of Forest Products, 2018, 38(3): 33-40.

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Preparation,Characterization and Gaseous Benzene Adsorption Performance of Mo-loaded Activated Carbon

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