中国煤炭清洁高效可持续开发利用战略研究

以煤矿地下水库中采集煤矸石为吸附剂，以溶解性有机质(dissolved organic matter，DOM)为目标污染物，探究煤矸石对DOM的吸附性能. 采用SEM、BET、BJH、XRF对煤矸石进行表征，并研究了煤矸石吸附剂投加量、反应温度和初始DOM质量浓度等因素对去除率的影响. 结果表明，煤矸石呈片层状结构，颗粒间孔隙较发达，且其BET比表面积为5.697 m²/g. 在DOM溶液质量浓度为20 mg/L、煤矸石投加量为20 g/L、温度为25 ℃和吸附时间为12 h的条件下，煤矸石对DOM的平衡吸附量为0.748 mg/g，DOM去除率可达74.78%. 煤矸石吸附DOM的实验数据可以用Langmuir等温线和准二级动力学模型模拟. 说明吸附过程为单分子层吸附，以化学吸附为主. 热力学分析结果表明该过程为自发性吸热反应过程. 深入探究了煤矸石净化高矿化度矿井水中DOM的净化性能及其净化机制，以期为以宁东矿区为代表的高矿化度矿井水地下水库存储水质安全提供一定理论支持和技术指导，为解决以宁东矿区为代表的西部煤矿区水资源短缺提供理论方案.

Strategic research on clean,efficient, sustainable exploitation and utilization of coal in China

Research of dissolved organic matter (DOM) adsorption by coal gangue was carried out. Coal gangue was from coal mine underground reservoir and was characterized by SEM, BET, BJH, and XRF. The effects of the coal gangue dosage, temperature, and initial DOM concentration on DOM removal by coal gangue were investigated. Results show that the coal gangue has a lamellar structure with well-developed inter-particle pores. The BET specific surface area of the coal gangue was 5.697 m²/g. A 0.748 mg/g equilibrium adsorption capacity and 74.78% DOM removal efficiency were gotten under the conditions of 20 mg/L DOM concentration, 20 g/L coal gangue, 25 ℃, and 12 hours adsorption time. The DOM adsorption by coal gangue can be well described by Langmuir isotherm and quasi-second-order kinetic model. The adsorption process was monolayer adsorption and was mainly chemical adsorption. The thermodynamic analysis shows that the adsorption process is a spontaneous endothermic reaction. DOM removal performance and mechanism by coal gangue in high-salinity mine water system were deeply explored. The research results may provide a theoretical support and technical guidance for safe storage of water in underground reservoir with high-salinity mines (represented by the Ningdong mining area), and give an insight for solving the problem of water shortage in the western coal mining areas.