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Decrease in hydrophilicity and moisture readsorption of Manglai lignite using lauryl polyoxyethylene ether: Effects of the HLB and coverage on functional groups and pores
Fuel Processing Technology ( IF 7.5 ) Pub Date : 2018-06-01 , DOI: 10.1016/j.fuproc.2018.02.010
Xiaoyang Liu , Shengyu Liu , Minqiang Fan , Jianying Guo , Bao Li

Abstract Decrease in hydrophilicity of lignite and moisture readsorption after adsorption of a series of lauryl polyoxyethylene ether (C12(EO)n) were studied with the measurement of wetting heat and moisture readsorption ratio. Effect of the hydrophilic lipophilic balance (HLB) of C12(EO)n on efficiency of the decrease in lignite hydrophilicity was investigated. X-ray photoelectron spectroscopy (XPS) and nitrogen adsorption/desorption were used to disclose the coverage characteristics of the different functional groups and the aggregations in pores of lignite by the adsorbed surfactant. Results indicated that both wetting heat and moisture readsorption ratio of lignite decreased significantly using different C12(EO)n. The size order of wetting heat of lignite after adsorption of different C12(EO)n with variation of the HLB values were almost consistent with that of moisture readsorption. The low HLB values of C12(EO)n especially with HLB of around 13.62 and 12.49/9.75 are most efficient respectively for the decrease in wetting heat and moisture readsorption of lignite. Coverage of oxygen-containing groups by surfactant was mainly devoted to the decrease in hydrophilicity of lignite. Among those oxygen groups in lignite surface, the COO/COOH and C-O/OH were responsible for adsorption priorities. Aggregations of surfactant in pores were beneficial for decreasing moisture readsorpiton of lignite surface due to the decreased storing space of moisture.

中文翻译:

使用月桂基聚氧乙烯醚降低芒莱褐煤的亲水性和水分再吸收:HLB 和覆盖对官能团和孔隙的影响

摘要 通过润湿热和水分重吸比的测量研究了一系列月桂基聚氧乙烯醚(C12(EO)n)吸附后褐煤亲水性和水分重吸率的降低。研究了 C12(EO)n 的亲水亲油平衡 (HLB) 对褐煤亲水性降低效率的影响。X射线光电子能谱(XPS)和氮吸附/解吸被用来揭示不同官能团的覆盖特征和吸附的表面活性剂在褐煤孔隙中的聚集。结果表明,使用不同的C12(EO)n,褐煤的湿热重吸率和水分重吸率均显着降低。褐煤在吸附不同C12(EO)n后随HLB值变化的润湿热大小顺序与水分重吸基本一致。C12(EO)n 的低 HLB 值,尤其是 HLB 约为 13.62 和 12.49/9.75,分别对降低褐煤的湿热和水分再吸附最有效。表面活性剂对含氧基团的覆盖主要是由于褐煤亲水性的降低。在褐煤表面的这些氧基团中,COO/COOH 和 CO/OH 负责吸附优先级。由于水分储存空间的减少,孔隙中表面活性剂的聚集有利于减少褐煤表面的水分吸附。49/9.75 分别对于降低褐煤的润湿热和水分再吸收最有效。表面活性剂对含氧基团的覆盖主要是由于褐煤亲水性的降低。在褐煤表面的这些氧基团中,COO/COOH 和 CO/OH 负责吸附优先级。由于水分储存空间的减少,孔隙中表面活性剂的聚集有利于减少褐煤表面的水分吸附。49/9.75 分别对于降低褐煤的润湿热和水分再吸收最有效。表面活性剂对含氧基团的覆盖主要是由于褐煤亲水性的降低。在褐煤表面的这些氧基团中,COO/COOH 和 CO/OH 负责吸附优先级。由于水分储存空间的减少,孔隙中表面活性剂的聚集有利于减少褐煤表面的水分吸附。
更新日期:2018-06-01
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