CAJ | 학술논문

以微硅粉为硅源,CTAB 和 PEG-6000为模板剂,采用水热法制备得到 MCM-41介孔分子筛。以该MCM-41为载体,采用后接枝法将巯丙基三甲氧基硅烷引入到MCM-41的表面和孔道内,合成了巯基功能化的MCM-41介孔分子筛(S H-MCM-41),并采用XRD、N2吸附-脱附曲线和FT-IR对样品进行了表征。以巯基功能化的样品为吸附剂,对含 Cr2 O2-7的溶液进行了静态吸附实验,研究了 pH 值和初始浓度对吸附剂吸附性能的影响,探讨了吸附过程的热力学。结果表明,吸附剂吸附量随初始浓度和温度升高而增加,当pH 值为1时吸附容量最大,达25.5 mg/g。不同温度下Langmuir 方程均呈现很好的拟合度,热力学平衡方程计算得ΔG<0,ΔH=14.2 kJ/mol,ΔS>0,表明该吸附过程是自发的、吸热、熵增加的过程。
이미규분위규원,CTAB 화 PEG-6000위모판제,채용수열법제비득도 MCM-41개공분자사。이해MCM-41위재체,채용후접지법장구병기삼갑양기규완인입도MCM-41적표면화공도내,합성료구기공능화적MCM-41개공분자사(S H-MCM-41),병채용XRD、N2흡부-탈부곡선화FT-IR대양품진행료표정。이구기공능화적양품위흡부제,대함 Cr2 O2-7적용액진행료정태흡부실험,연구료 pH 치화초시농도대흡부제흡부성능적영향,탐토료흡부과정적열역학。결과표명,흡부제흡부량수초시농도화온도승고이증가,당pH 치위1시흡부용량최대,체25.5 mg/g。불동온도하Langmuir 방정균정현흔호적의합도,열역학평형방정계산득ΔG<0,ΔH=14.2 kJ/mol,ΔS>0,표명해흡부과정시자발적、흡열、적증가적과정。
Using the silica fume as silica source,CTAB and PEG-6000 as template agent,the MCM-41 meso-porous silica materials were successfully synthesized.3-Mercaptopropyl trimethoxysilane was introduced into the network of MCM-41 through post-grafting and thiol-functionalized MCM-41 mesoporous silica (SH-MCM-41)was obtained.The SH-MCM-41 was characterized by XRD,N2 adsorption-desorption isotherm,and FT-IR.Cr2 O2-7 adsorption characteristics in water solution have been studied in static experiments with the SH-MCM-41 as adsorbent.The influence of solution pH value and initial metal ion concentration was investigated. And the thermodynamics of Cr2 O2-7 adsorption onto SH-MCM-41 was also studied.It was showed that adsorp-tion capacity of Cr2 O2-7 increased with increasing initial metal ion concentration and temperature.And its high-est value was 25.5 mg/g at pH 1.Experimental data fitted well to the Langmuir model at all temperatures studied.The thermodynamic equilibrium functions were also determined.ΔG<0,ΔH=14.2 kJ/mol,ΔS>0, so the adsorption was spontaneous,endothermic and entropy increasing.