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Superficial performance and pore structure of palygorskite treated by hydrochloric acid 总被引:1,自引:0,他引:1
In order to amend the superficial performance of palygorskite and improve its application, the natural palygorskite(NP) was treated in the dipping and ionic exchanging experiments using 6 mol/L hydrochloric acid treatment. The performance and pore structure of the treated palygorskite(TP) were investigated by means of microscope analyses, FT-IR, XRF, BET-SSA and full hole distribution analytical techniques. The results show that the hydrochloric acid treatment can make the gracile and aggregating compact crystal bundles inside palygorskite clay broken and dispersed, the roughness of microcrystalline surface increases, which not only can dissolve or remove dolomite but vary the superficial performance of palygorskite to some degree. The specific surface area and pore volume increase a lot, while the mean pore size decreases. The pore structure of TP changes remarkably compared with that of NP after 6 mol/L hydrochloric acid treatment, and the relevant physicochemical performance can be improved. 相似文献
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烤烟品种K326和云烟87对镉胁迫的生理响应及抗性差异 总被引:8,自引:1,他引:8
水培条件下,研究镉(Cd)胁迫后2个常用烤烟品种(K326和云烟87)对Cd的吸收及Cd在细胞中的分布,比较Cd处理前后烟株的生物质积累、叶绿素含量、根系活力、叶表及根尖微结构的变化.结果表明,外源Cd处理使K326的生物量比对照降低37.7%,云烟87生物量降低76.2%;K326的总叶绿素含量比对照降低64%,云烟87的降低53%;K326根的活跃吸收面积比对照降低33.3%,云烟87的降低13.9%.不加Cd时,2种烟草气孔大小均一,密度相近,Cd处理后,两者的气孔均减小,密度增大.在Cd的影响下,K326品种的细胞直径下降了35%,云烟87的下降不显著.Cd处理使完整饱满的根尖变得皱缩平秃.Cd处理使K326叶表腺毛腺头变小、腺毛变细,尤其腺基部变细更明显;Cd处理使云烟87叶表腺毛发育相对延迟.Cd主要存在于K326和云烟87的根部,分别占总量的82%和89.4%,在叶细胞的5个组分中,以可溶性组分中最高,且K326中Cd的含量高于云烟87.从生物质积累量来看,Cd处理对K326的影响小于对云烟87的影响,两个烟草品种耐受Cd的能力差异较大. 相似文献
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长兴电厂技改工程输煤系统要求翻车机房地下部分基坑开挖深度为18 6m,最深处达20 4m,平面尺寸为31 2m×27 0m,在沿海软土地区建造这样深的地下建筑较少见到,对围护结构的侧向变形要求很高,该工程具有一定的难度和风险。根据安全经济和便于施工的原则结合场地条件和工程实践,提出了土钉和桩列式复合围护结构方案,成功地解决了这一难题。经过现场监测效果良好,符合质量要求,其技术经济指标较佳。 相似文献
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通过对温州发电厂二期煤场软基堆煤自预压变形的稳定分析和现场实时监测, 获得了大量有实用价值的实测资料及分析研究的成果, 提出了控制变形的措施和方法。 相似文献
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