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分析湖北钟祥杨榨累托石矿床的累托石土样的基本物化特性的基础上,进行了累托石对模拟核素Sr2+、Cs+、Co2+的静态吸附性能的研究。实验表明,累托石的阳离子交换容量(CEC)为36.04 mmol/100 g,胀缩度为23.89%,渗透系数为6.94×10-8cm/s。在中性条件下,累托石对模拟核素Sr2+、Cs+、Co2+的平衡吸附量分别为70,48,20 mg/g。累托石对核素的吸附量会随着吸附时间的增加而逐渐趋于稳定。弱碱性条件下累托石的吸附效果更好。 相似文献
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改性累托石对水溶液中Cr(Ⅵ)的吸附 总被引:11,自引:6,他引:5
用十二烷基二甲基苄基氯化铵[C12H25(CH3)2(C6H5CH2)NCl,1227]、十六烷基三甲基溴化铵[C16H33(CH3)3NBr,1631]、十八烷基三甲基溴化铵[C18H37(CH3)3NBr,1831]3种表面活性剂改性天然粘土累托石(rectorite,REC),得到3种有机改性累托石:1227-REC,1631-REC和1831-REC。用3种有机改性累托石对水溶液中无机重金属离子C(Ⅵ)进行吸附实验,考察了pH值、吸附时间、温度等因素对吸附效果的影响。同时,用3种吸附累托石1227-REC-Cr,1631-REC-Cr和1831-REC-Cr对Cr(Ⅵ)进行解吸试验,考察了pH值对解吸效果的影响。结果表明:3种吸附剂在室温下达到满意吸附效果的pH值为6,平衡时间分别为30,20,20min。在该条件下被吸附Cr(Ⅵ)的量与吸附前相比分别为80.2%,95.5%和97.6%,且3种吸附剂对Cr(Ⅵ)均是Langmiur单分子吸附。当pH值为10时,3种吸附累托石解吸出Cr(Ⅵ)的量对其原吸附量相比分别是89.2%,96.3%和97.7%。 相似文献
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铁交联累托石处理含硝基酚钠废水的研究 总被引:5,自引:1,他引:5
用累托石与铁交联剂进行交联反应,在原土悬浮液为5%,铁交联剂投加质量分数为6%,pH值为3.00,温度为40℃,交联2h的条件下所得铁交联累托石,由X射线衍射(XRD)显示,其d001由2.3nm提高到3.6~4.0nm。对含硝基酚钠工业废水进行吸附处理试验,结果表明,铁交联累托石对硝基酚钠的静态吸附容量为12.89mg/g,吸附热力学参数分别为:ΔH=6.68kJ/mol,ΔG=-3.91kJ/mol,ΔS=35.9J/(mol·K),等温吸附遵循Freundlich曲线,吸附速率常数K295=4.72×10-4s-1。 相似文献
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累托石交换吸附银离子的影响因素研究 总被引:1,自引:0,他引:1
为制备载银抗菌累托石粉体,对累托石负载银离子的影响因素进行了较为系统的实验研究。结果表明:累托石悬浮液质量分数和溶液中银离子的初始浓度对累托石的含银量和溶液中银离子的交换率影响最明显,其次是溶液pH值、反应时间,而温度的影响没有其它因素明显。在优化条件下,累托石的含银量和溶液中银离子的交换率分别可达7.52%和92.84%。 相似文献
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Highly selective removal of organic dyes from aqueous solutions with chitin beads entrapping rectorite 下载免费PDF全文
By blending chitin with rectorite and organic rectorite in an 8 wt % NaOH/4 wt % urea aqueous solution, we successfully fabricated millimeter‐scale chitin/rectorite composite beads (BCRs) and chitin/organic rectorite beads (BCO), respectively, via an optimal dropping technology. The adsorption of the organic dyes on the BCRs and BCOs were investigated to evaluate the selective removal of methylene blue (MB) and methyl orange (MO) of different charges. Adsorption kinetics experiments were carried out, and the data fit a pseudo‐second‐order equation well. The results reveal that the BCR and BCO sorbents efficiently and selectively adsorbed MO and MB, respectively, from wastewater. The adsorption capacity (Qe) and removed percentage of MB by BCR were 0.1978 mg/g and 98.90%. The Qe and R values of MO by BCO were 0.3988 mg/g and 99.70%. Therefore, in this study, we dealt with the development of a clean and safe process for water pollution remediation. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 40905. 相似文献
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Using rectorite extrudates from calcined rectorite powder as the starting material,a series of ZSM-5/rectorite composites were prepared via the in-situ crystallization method.The physicochemical properties and propylene boosting performance of the resulting samples were characterized by using X-ray diffraction,scan-ning electronic microscopy/energy dispersive spectrometer,N2 adsorption-desorption,and Fourier transformed in-frared spectroscopy of pyridine adsorption,respectively,and assessed by using Daqing atmospheric residue as feed-stock.The results showed that the ZSM-5/rectorite composites in which the ZSM-5 phase grows in-situ as a 2-3 μm thick layer on rectorite particles have a trimodal microporous-mesoporous-macroporous structure and thus exhibit outstanding propylene boosting performance.Compared with a commercial ZSM-5 incorporated fluid catalytic cracking catalyst,the ZSM-5/rectorite composite incorporated catalyst increased the yield and selectivity of pro-pylene by 2.44% and 5.35%,respectively. 相似文献