十六烷基三甲氧基硅烷改性生物炭的疏水性能优化试验  

Optimization of hydrophobic properties of hexadecyl trimethoxy silane modified biochar

作　　者：孙晓杰[1,2] 伍贝贝 秦永丽 李洁 郭静晗[1,2] SUN Xiao-jie;WU Bei-bei;QIN Yong-li;LI Jie;GUO Jing-han(College of Environmental Science and Engineering,Guilin University of Technology,Guilin 541006,China;Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology,Guilin University of Technology,Guilin 541006,China)

机构地区：[1]桂林理工大学环境科学与工程学院,广西桂林541006 [2]桂林理工大学广西环境污染控制理论与技术重点实验室,广西桂林541006

出　　处：《桂林理工大学学报》2020年第4期798-802,共5页Journal of Guilin University of Technology

基　　金：国家自然科学基金项目(51668014);广西自然科学基金项目(2018GXNSFGA281001);广西科技重大专项(AA18118013);广西科技计划项目(AD18126018);广西第五批“特聘专家”专项资金项目。

摘　　要：生物炭改性土壤覆盖层因渗透系数增加会导致覆盖层含水率增加,进而影响CH_(4)吸附、氧化和减排。采用十六烷基三甲氧基硅烷作为改性剂,无水乙醇作为溶剂对生物炭进行疏水改性。考察了改性剂浓度、改性剂与生物炭的接触时间、烘干时间、烘干温度等对生物炭疏水性能的影响,获得了最佳疏水性生物炭的条件。在改性剂浓度为3%、静置浸泡60 min、110℃干燥2 h的条件下制备的改性生物炭的吸水率最低可达到14.4%,远低于未改性生物炭的吸水率245.4%,以期添加至土壤覆盖层后降低其含水率,为填埋场甲烷减排提供技术支持。The increase of permeability coefficient of biochar modified soil will increase water content of overburden,which will affect CH_(4) adsorption,oxidation and emission reduction.Hexadecyl trimethoxy silane was used as modifier and anhydrous ethanol as solvent to modify biochar.The effects of modifier concentration,contact time,drying time and drying temperature on the hydrophobic properties of biochar were investigated.Under the condition of 3%modifier concentration,60 min standing soak and 2 h drying at 110℃,the water absorption rate of modified biochar could reach 14.4%,much lower than that of the unmodified biochar 245.4%.It is expected to reduce the moisture content after the modified biochar is added to the soil cover to provide technical support for the landfill methane emission reduction.

关 键 词：十六烷基三甲氧基硅烷 生物炭 疏水性 

分 类 号：X131.3[环境科学与工程—环境科学]