The modification of carbon materials is an important means to improve the adsorption capacity of carbon-based materials for volatile gases.Cotton stalk-based carbon materials were modified by KOH etching,and then modified with Na2CO3 and NaHSO3.The effects of unmodified cotton stalk-based carbon materials (C),KOH-modified cotton stalk-based carbon materials (Ck),and Na2CO3 and NaHSO3-modified cotton stalk-based carbon materials (Ck-s) on the adsorption capacity of formaldehyde gas were investigated.The optimum preparation process of cotton stalk mesoporous-microporous carbon material was obtained by orthogonal experiment.The prepared materials were characterized by Brunner-Emmet-Teller measurements,scanning electron microscope and X-ray energy dispersive spectroscopy.The results showed that the average pore sizes of C,Ck and Ck-s were 2.51nm,2.15nm and 1.93nm,respectively.and all three were mesoporous-microporous carbon-based materials.The formaldehyde removal rate of Ck and Ck-s were as high as 84% and 86.4%,respectively,which were greatly improved compared with that of unmodified C (formaldehyde removal rate of 24%).The average pore size,specific surface area and total pore volume of Ck-s were less than that of Ck,but the formaldehyde removal rate was slightly higher than that of Ck,indicating that the modification of low specific surface area carbon materials with Na2CO3 and NaHSO3 could improve their adsorption capacity for formaldehyde.The adsorption processes of Ck and Ck-s conformed to the quasi-first-order and the quasi-second-order kinetic models,and were monomolecular layer adsorption,with theoretical maximum adsorption amounts of 3.95mg/g and 5.78mg/g,respectively.
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基金资助
塔里木大学校长基金(TDZKSS202003);现代农业工程重点实验室开放课题(TDNG2021202);国家自然科学基金(21865027)
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