碱改性稻秸炭的理化特性及吸附性能  

Physicochemical Properties and Adsorption Performance of Alkali Modified Rice Straw Biochar

作　　者：彭娜 周海军 王开峰 PENG Na;ZHOU Haijun;WANG Kaifeng(School of Environmental Science and Engineering,Guangdong University of Petrochemical Technology,Maoming 525000,China)

机构地区：[1]广东石油化工学院环境科学与工程学院,广东茂名525000

出　　处：《广东石油化工学院学报》2025年第1期45-48,共4页Journal of Guangdong University of Petrochemical Technology

基　　金：广东石油化工学院人才引进项目(2020rc012,2020rc019)。

摘　　要：借助化学分析、仪器表征、热解实验和吸附实验,对比研究了四种碱(氢氧化钠、氢氧化钾、氢氧化镁和氢氧化钙)改性稻秸炭的理化特性及吸附性能。结果表明,四种碱改性明显增大了稻秸炭的碱性(pH),氢氧化钠和氢氧化钾改性增幅较大,分别增加了2.6和1.9。碱改性明显降低了稻秸炭的C和N含量,增加了O、H含量和含氧官能团数量,增大了H/C、O/C和(O+N)/C原子比,增强了极性。氢氧化钠、氢氧化钾和氢氧化钙改性明显增加了稻秸炭对亚甲基蓝的吸附量,四种碱改性明显增加了稻秸炭对四环素的吸附量,其中,氢氧化钙改性稻秸炭对亚甲基蓝和四环素的吸附量增加幅度最大,分别达到了462.0%和911.3%。氢氧化钙是四种碱中最好的改性剂,氢氧化钙改性稻秸炭在吸附去除有机污染物方面有较大应用潜力。Through chemical analysis,instrumental characterization,pyrolysis experiments,and adsorption experiments,the physicochemical properties and adsorption performance of four types of alkali(sodium hydroxide,potassium hydroxide,magnesium hydroxide,and calcium hydroxide)modified rice straw biochar were compared and studied.The results showed that the four alkaline modifications significantly increased the alkalinity(pH value)of rice straw biochar,and the modifications with sodium hydroxide and potassium hydroxide increased significantly.Alkaline modification significantly reduced the C and N content of rice straw biochar,increased the O and H content and the number of oxygen-containing functional groups,increased the H/C,O/C,and(O+N)/C atomic ratios,and enhanced polarity.The modification with sodium hydroxide,potassium hydroxide,and calcium hydroxide significantly increased the adsorption capacity of rice straw biochar for methylene blue.The four alkaline modifications significantly increased the adsorption capacity of rice straw biochar for tetracycline.Among them,calcium hydroxide modified rice straw biochar showed the largest increase in adsorption capacity for methylene blue and tetracycline.Calcium hydroxide is the best modifier among the four alkalis,and calcium hydroxide modified rice straw biochar has great potential for application in the adsorption and removal of organic pollutants.

关 键 词：改性稻秸炭 碱 理化特性 吸附性能 

分 类 号：X703.1[环境科学与工程—环境工程]