磷酸活化花椒籽制备活性炭及其对亚甲基蓝的吸附  

Preparation of activated carbon from Chinese prickly seeds activated by H_(3)PO_(4)and its adsorption property for methylene blue

作　　者：王彬 王亚非[1] 査飞 田海锋[1] 常玥[1] WANG Bin;WANG Ya-fei;ZHA Fei;TIAN Hai-feng;CHANG Yue(College of Chemistry&Chemical Engineering,Northwest Normal University,Lanzhou 730070,China;Qinghai Salt Lake Technology Development Co.,Ltd.,Golmud 816099,China)

机构地区：[1]西北师范大学化学化工学院,甘肃兰州730070 [2]青海盐湖科技开发有限公司,青海格尔木816099

出　　处：《应用化工》2023年第12期3297-3302,共6页Applied Chemical Industry

基　　金：国家自然科学基金(22268039,21865031)。

摘　　要：以H_(3)PO_(4)为活化剂处理花椒籽制备花椒籽活性炭,采用FTIR、XRD、N 2吸脱附、SEM和EDS对制备的活性炭进行了结构和形貌表征,测定了其对亚甲基蓝的吸附。结果表明,在85%(质量分数)的磷酸∶花椒籽=0.8,室温下浸渍10 h,550℃下碳化60 min,可制得比表面积为740 m^(2)/g,包含微孔和介孔的活性炭,其产率为23.4%。利用制备的花椒籽活性炭对亚甲基蓝进行吸附,在温度30℃和pH=13.0时吸附60 min,其对初始浓度为500 mg/L亚甲基蓝的最大吸附容量为495 mg/g,吸附符合Langmuir等温模型,吸附焓为33.7 kJ/mol,吸附熵为125.9 J/(mol·℃)。动力学研究表明可用准二级动力学模型对吸附过程较好模拟,吸附活化能为6.33 kJ/mol。研究为花椒籽的高质化利用和花椒籽活性炭吸附处理染料废水提供参考依据。Activated carbon was prepared from Chinese prickly seeds activated by H_(3)PO_(4).It was characterized by the methods of FTIR,N 2 adsorption/desorption,XRD,SEM and EDS.The adsorption performance for methylene blue was investigated.Under the conditions that impregnation mass ratio of 85%H_(3)PO_(4)to Chinese prickly seeds was 0.8,impregnation time was 10 h,carbonization temperature was 550℃and carbonization time was 60 min,activated carbon containing micro and meso-porous was prepared successfully with the yield and BET specific area were 23.4%and 740 m^(2)/g,respectively.The adsorption for methylene blue investigation showed the adsorption capacity could be achieved to 495 mg/g when the initial concentration of methylene blue is 500 mg/L under the adsorption temperature at 30℃and pH of 13.0 after adsorbed for 60 min.Thermodynamics studies showed the adsorption process can be favorably described by Langmuir isotherm that 0x0E䥺SymbolDA@0x0F H is 33.7 kJ/mol and 0x0E䥺SymbolDA@0x0F S is 125.9 J/(mol·℃).The adsorption kinetics was satisfactory fitted to the pseudo-second-order model that the activated energy is 6.33 kJ/mol.The study provides a reference for the high-quality utilization of Chinese brickly seeds and the useful data for the adsorption treatment of dye wastewater by activated carbon preparation from Chinese brickly seeds.

关 键 词：花椒籽 活性炭 H_(3)PO_(4) 亚甲基蓝 吸附 

分 类 号：TQ424.1[化学工程]