干旱区生态环境知识资源中心(Arid): 十二烷基苯磺酸钠改性黏土抑制沙土水分蒸发

Arid

	十二烷基苯磺酸钠改性黏土抑制沙土水分蒸发
其他题名	Inhibiting water evaporation of sand soil with clay modified by linear alklybezene sulfonates
	张增志; 渠永平; 王宏娟; 杜红梅
来源期刊	农业工程学报
ISSN	1002-6819
出版年	2014
卷号	30 期号:18 页码:168-175
中文摘要	针对荒漠化地区生态恢复中沙土有效水分涵养难的问题,采用十二烷基苯磺酸钠(linear alklybezene sulfonates,LAS)与黏土复合制备土基改性材料。研究了材料在模拟沙漠气候条件下的保水性能,并测试材料老化后抗压强度损失率和质量损失率以及其保水性能的变化。采用扫描电子显微镜、傅里叶红外光谱分析、X 射线衍射分析、热重分析对材料保水机理进行研究。结果表明,土基改性材料保水性能良好,改性后黏土的片层结构和化学成分没有明显变化,通过LAS亲水端与黏土中结合水的相互作用,将松散的黏土胶结起来,LAS中憎水端相互连接形成憎水网络,从而在地表形成透气保水的固结层来有效降低水分蒸发。模拟沙漠气候条件下的植草试验表明当 LAS 和黏土的质量比为2∶1时,土基改性材料保水透气性能较佳,草籽发芽率从对照组的8%提高到43%。研究结果为制备新型土基固沙植草材料提供参考。
英文摘要	Desertification is one of the most serious environment problems in the world. Three methods commonly used in desertification control are engineering, chemical and biological sand fixation. Aiming at available water conservation in desertification ecological restoration, the clay-based modified materials were prepared by clay and sodium dodecyl benzene sulphonate (LAS) composite. LAS (2, 4, 6 and 8 g) was individually dissolved into 15 g distilled water while strong stirring for 10 minutes. Then, 3 g bentonite was slowly added into the solutions under strong stirring. The slurry was sprinkled onto sand with a relative humidity of 40%. The samples were regarded as L1, L2, L3 and L4, respectively according to the different contents of LAS (2, 4, 6 and 8 g), and the original clay L was as control group. The water retention property was studied in simulated desertification climate and the materials were analyzed and characterized by scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR), X-Ray diffraction (XRD) and thermal gravity analysis (TGA). The materials were placed at 30 cm blow the 500 W ultraviolet (UV) carbon arc lamp to test the resistance to aging. The results showed that the water content of the control group fell sharply to zero just in 3 days. The falling rates of the water content for all the modified materials slowed down, and the water retention property was improved with increasing LAS content. L4 had the best performance for moisture content of 3.2% on the tenth day. It was because the clay particles had been cemented into large particles by LAS and the hydrophobic ends of LAS were connected to form a hydrophobic network that can inhibit water evaporation. As such, samples with high LAS content had better water retention ability. The aging results showed that the compression strength were all higher than 4.25 MPa. Samples with high LAS content had higher strength and the compression strength of L4 was 6.35 MPa. The compression strength and mass lost was small after aging and highest in samples with high LAS content. After 300 hours aging, the lost of L4 was highest with the strength loss rate of 8.7% and mass loss of 1.7%. It was because the photolysis rate of LAS in solid-state was very low and its decomposition temperature was above 450℃. So the materials had good performance of resistance to aging.
中文关键词	生态 ; 水分 ; 蒸发 ; 十二烷基苯磺酸钠 ; 黏土 ; 保水性能
英文关键词	ecology moisture evaporation LAS clay water retention
语种	中文
国家	中国
收录类别	CSCD
WOS类目	ENGINEERING INDUSTRIAL
WOS研究方向	Engineering
CSCD记录号	CSCD:5270909
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/231489
作者单位	中国矿业大学(北京)生态功能材料研究所, 北京 100083, 中国
推荐引用方式 GB/T 7714	张增志,渠永平,王宏娟,等. 十二烷基苯磺酸钠改性黏土抑制沙土水分蒸发[J],2014,30(18):168-175.
APA	张增志,渠永平,王宏娟,&杜红梅.(2014).十二烷基苯磺酸钠改性黏土抑制沙土水分蒸发.农业工程学报,30(18),168-175.
MLA	张增志,et al."十二烷基苯磺酸钠改性黏土抑制沙土水分蒸发".农业工程学报 30.18(2014):168-175.