研究报告
田华,张晴,谢祖锋,王前吉,万娜.富油煤热解产物在粉砂介质中的吸附行为研究[J].环境科学学报,2022,42(9):133-140
富油煤热解产物在粉砂介质中的吸附行为研究
- Study on adsorption behavior of pyrolysis products of tar-rich coal in silt medium
- 基金项目：国家自然科学基金（No.41202176，51704230）；陕西省重点研发计划项目（No.2021SF-445）
- 作者
- 单位
- 田华
- 西安科技大学地质与环境学院，西安 710054;陕西省煤炭绿色开发地质保障重点实验室，西安 710054
- 张晴
- 西安科技大学地质与环境学院，西安 710054
- 谢祖锋
- 西安科技大学地质与环境学院，西安 710054
- 王前吉
- 西安科技大学地质与环境学院，西安 710054
- 万娜
- 西安石油大学人文学院，西安 710065
- 摘要：富油煤原位热解产生的油、气等有机物会通过岩层的压裂缝进入含水层，产生一系列环境行为效应.为探究富油煤热解产物对地下水的影响，以陕北榆神府矿区富油煤与含水介质粉砂为研究对象，采用批量平衡试验，开展了粉砂对煤焦油不同组分的吸附动力学与吸附热力学研究.结果表明：粉砂对煤焦油中酚油、萘油、洗油、蒽油、沥青的动力学吸附均符合准二级动力学方程，等温吸附模型符合Freundlich方程，说明粉砂对5种组分的吸附为单分子层化学吸附；受富油煤热解焦油组分含量差异影响，粉砂对5种组分的吸附量表现为酚油<萘油<洗油<蒽油<沥青，其最大吸附量分别为0.4520、0.7926、1.9015、3.6336、11.8001 mg·g-1，吸附量总和占煤焦油含量的68%~85%；随着温度的升高，粉砂对5种组分的吸附能力均有所减弱，表明升高温度不利于吸附行为的进行，且反应的ΔG0<0表明粉砂对5种组分的吸附过程主要以化学吸附为主且属于放热反应.
- Abstract：Organic matter such as oil and gas generated from the in-situ pyrolysis of tar-rich coal will enter into the aquifer through the fractures and produce a series of environmental behavior. In this study， adsorption behavior of coal tar on silt which was the typical aquifer media in Yushenfu mining area in northern Shaanxi was used to explore the influence of the pyrolysis products of tar-rich coal on groundwater by using the batch equilibrium experiment. The results showed that the kinetic adsorption of phenol oil， naphthalene oil， washing oil， anthracene oil， and asphalt in coal tar on silt could be well described by pseudo-second-order model. The adsorption equilibrium isotherms were well fitted by Freundlich models， indicating that the adsorption was monolayer chemical adsorption. Influenced by the content of tar components， the adsorption capacities of five components on silt were ranked as phenol oil < naphthalene oil < washing oil< anthracene oil< asphalt， and the maximum adsorption capacities were 0.4520， 0.7926， 1.9015， 3.6336 and 11.8001 mg·g-1 respectively. The total adsorption capacities was 68%~85% of the coal tar. The adsorption of silt was weakened with the temperature increasing which indicated that the temperature increasing was harmful to the adsorption. The data ΔG0<0 showed the adsorption of five components by silt was chemical adsorption and exothermic.
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