塔里木大学学报2025，Vol.37Issue(6)：53-63,11.DOI:10.3969/j.issn.1009-0568.2025.06.006
亚硫酸氢钠修饰改性棉秆炭吸附水中甲醛的研究
Study on formaldehyde adsorption from water by sodium bisulfite-modified cotton stalk charcoal
摘要
Abstract
In this study,cotton stalk charcoal material was modified using phosphoric acid etching method,followed by further modification with sodium carbonate and sodium bisulfite.The adsorption characteristics of the unmodified cotton stalk-based charcoal materials AC,phosphoric acid modified material H-AC,and sodium carbonate/sodium bisulfite modified material S-AC were compared to evaluate the formaldehyde adsorption capability of cotton stalk-based charcoal before and after modification.An orthogonal experimental design was used to optimize the preparation process of cotton stalk charcoal materials,which were physically characterized by fourier transform infrared spectrometer(FTIR),Brunauer-Emmett-Teller nitrogen adsorption method(BET),and scanning electron microscope-energy dispersive spectrometer(SEM-EDS).The results revealed that all the three biochar materials exhibited obvious functional groups such as C—O,—OH based on BET,SEM-EDS,and FTIR characterization.The surface of S-AC was rough with increased Na and S contents.The average pore diameters of AC,H-AC,and S-AC were found to be 2.45 nm,2.65 nm,and 2.58 nm,respectively,all belonging to meso-micro porous charcoal-based materials.After treatment with phosphoric acid solution(impregnation ratio of 1:6 for 5 h,activation at 400℃for 2 h)and treatment with saturated sodium bisulfite solution(1 h),the adsorption efficiency of S-AC for formaldehyde could reach 96.13％within 60 min,which significantly exceeded that of AC(32.40％)and H-AC(62.72％).The adsorption kinetics of H-AC and S-AC both conformed to the quasi-second-order kinetic model,exhibiting monomolecular layer adsorption characteristics,with a maximum adsorption capacity of 5.23 mg·g-1.The above research findings provide new ideas for the development of efficient adsorbents for industrial wastewater treatment.关键词
棉秆/改性/生物质炭/甲醛/吸附能力Key words
cotton stalk/modified/biochar/formaldehyde/adsorption capacity分类
化学化工引用本文复制引用
ZHAO Suya,CHEN Peng,YIN Xiong,HU Libing..亚硫酸氢钠修饰改性棉秆炭吸附水中甲醛的研究[J].塔里木大学学报,2025,37(6):53-63,11.基金项目
塔里木大学校长基金硕士人才项目(TDZKSS202003) （TDZKSS202003）
新疆生产建设兵团指导性科技计划项目(2023ZD097) （2023ZD097）
