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超细粉煤灰吸附亚甲基蓝的机理研究 总被引:2,自引:0,他引:2
以西安西郊热电厂粉煤灰(XFA),西安灞桥热电厂粉煤灰(BFA)和陕西渭河电厂粉煤灰(WFA)为原料,球磨后经旋风分级再用布袋收集逸出物分别得到超细粉煤灰XUFA、BUFA和WUFA。研究了超细粉煤灰对亚甲基蓝的吸附动力学、热力学以及pH值对吸附的影响。结果表明,超细粉煤灰对亚甲基蓝的吸附性能明显好于原粉煤灰。超细粉煤灰对亚甲基蓝的吸附性能按顺序为WUFA>XUFA>BUFA。粉煤灰颗粒粒度、比表面积和活性组分(SiO2 Al2O3)含量是影响粉煤灰吸附性能的主要因素。WUFA对亚甲基蓝的吸附符合Langmuir吸附等温式,而XUFA和BUFA对亚甲基蓝的吸附符合Freundlich吸附等温式。超细粉煤灰对亚甲基蓝的吸附均符合二级吸附动力学模型,吸附过程由颗粒内扩散过程控制。当溶液pH由2增加到8时,超细粉煤灰吸附量增加,后随pH值增加,吸附量略有下降。 相似文献
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Jin-long Yan 《高分子科学》2006,(5):497-502
The effects of pH, initial concentration and temperature on the adsorption of phenol by chitosan were investigated in this paper. The isothermal data was applied to Langmuir linear and the Freundlich linear isotherm equation, and the thermodynamic parameters (AH, AG, AS) were calculated according to the values of binding Langmuir constant, KL. Results indicated that the adsorption between chitosan and phenol was significantly physical in nature, the negative ΔH constant at lower temperature confirmed that more phenol was adsorbed by chitosan at lower temperature. The kinetics of the sorption process of phenol on chitosan was investigated using the pseudo-first order and pseudo-second order kinetics, and results showed that the second order equation model provided the best correlation with the experimental results. 相似文献
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改性焦粉对亚甲基蓝吸附性能及机理的研究 总被引:1,自引:0,他引:1
以废弃焦粉为原料,50%硝酸为改性剂,借助JSM、XPS分析测试方法表征其结构。考察了改性焦粉、焦粉对亚甲基蓝吸附性能、吸附平衡等温线、黏附几率和活化能,用Weber-Morris曲线研究吸附机理。结果表明,硝酸改性焦粉是硝酸刻蚀焦粉表面增加孔结构,增大表面积,表面氧化形成较为丰富含氧功能组的过程;改性焦粉对亚甲基蓝吸附性能明显优于焦粉;改性焦粉吸附量随亚甲基蓝溶液浓度、pH的增大而增加;吸附过程符合Langmuir、Freundlich吸附等温式;黏附几率和活化能分别为S=0.1977、2.5635kJ/mol;该吸附过程主要为颗粒内扩散控制的物理吸附。 相似文献
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陆益民 《理化检验(化学分册)》2005,41(8):580-581,584
将两点电位滴定法应用于亚甲基蓝等含可电离氯离子的碱性染料的测定。只需在滴定终点前附近记录两次AgNO3标准溶液体积和相应的电极电位值,利用两点法公式计算滴定终点,从而确定亚甲基蓝含量,此法简便、灵敏、准确。 相似文献
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大孔树脂对水溶液中邻苯二甲酸的吸附行为及其热力学研究 总被引:18,自引:0,他引:18
研究了NDA-150,ND-99和ND-900大孔树脂对水溶液中邻苯二甲酸的吸附热力学特性,结果表明,3种树脂对邻苯二甲酸的吸附都同时满足Freundlich和Langmuir等温吸附方程;NDA-150树脂存在以π-π作用为主的吸附作用,ND-99树脂的吸附行为是由氢键作用及π-π作用共同作用所致,ND-900树脂通过Lewis作用和静电力吸附邻苯二甲酸,吸附是一放热过程且吸附能够自发进行,ND-900树脂上的吸附是熵推动为主的吸附过程,而NDA-150、ND-99树脂上的吸附均为焓推动为主的吸附过程。 相似文献
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次甲基蓝-溴酸钾体系动力学光度法测定甲醛 总被引:15,自引:0,他引:15
在硫酸介质中 ,基于甲醛对溴酸钾氧化次甲基蓝 (MB)显著的促进作用 ,建立了测定甲醛的动力学光度法。线性范围为 0 .4 8~ 5 .6 0 μg·ml- 1,检出限为 0 .2 2 μg·ml- 1。对浓度水平为 1.6 μg·ml- 1甲醛的 10次平行测定的RSD为 0 .4 86 %。方法用于检测酚醛树脂以及动物标本室内空气中甲醛含量 ,结果满意 相似文献
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ADSORPTION OF TANNIN FROM AQUEOUS SOLUTION ONTO MACROPOROUS CROSSLINKED POLY(N-VINYL-ACETAMIDE) VIA HYDROGEN BONDING 总被引:3,自引:0,他引:3
XU Mancai WANG Cairong XU Mingcheng SHI Zuoqing ZHANG Shang LI Haitao SHI Rongfu FAN Yunge HE Binglin 《Chinese Journal of Reactive Polymers》2000,(1)
I INTRODUCTIONTannin is existed widely in the roots, stems and fruits of many plants 111. Tannin is stronglyastringent and puckery due to the hydrogen bonding between the phenolic hydroxyl groups intarmin and abide groups in Protein al. A series of PYOb\m won\d be abed if t~ is nOIremoved from the products made from plants. For example, the injection site of the patientwould be red and swollen if tannin had not been removed from the injection made from plantssuch as red-rooted sajvia; … 相似文献
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膨润土对亚甲基蓝的吸附性能研究 总被引:13,自引:0,他引:13
为将膨润土作为消化道粘膜保护剂提供依据,本文研究了钠质,钙质膨润土对亚甲基蓝的吸附性能。研究了在20℃下的吸附动力学,测试了肿附速率常数,绘制了20℃下各型膨润土的吸附等温线,并求得其饱和吸附量。结果表明,20℃时钠质膨润土的吸附速率要快于钙质膨润,各型膨润土的吸附行为符合Langmuir方程,钠质膨润土的饱和吸附量qm为86.51mg/g,与粘膜保护剂思密达比较接近,而钙质膨润土吸附能力相对较弱。 相似文献
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Two hypercrosslinked resins with similar physical characters but different surface chemistry were synthesized and used to remove phenol from aqueous solutions. The FTIR spectra, elemental analysis and the Boehm titration were used to characterize the chemical properties of the resins. The adsorption experiments were carried out using the bottle-point technique, and the effects of the surface chemistry on the adsorption were discussed. The adsorption data fit well with the Freundlich model, indicating the heterogeneity of the resins surface. It could be seen from the experimental results that the adsorption capacity increased with the increase in the total surface concentration of oxygen-containing groups. The pH dependence and the effects of ionic strength were also discussed. The kinetic adsorption data fit well with the pseudo-second order model, and the results showed that the surface oxygen-containing groups have little effect on the adsorption rate. 相似文献
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水介质中氢键吸附与疏水吸附协同作用的研究 总被引:7,自引:0,他引:7
研究了丙烯酸型树脂(D152)在水、乙醇和正己烷中对苯胺、N-甲基苯胺和N,N-二甲基苯胺的吸附行为.在水中D152树脂对3种吸附质的吸附亲合性随N上甲基数的增加而增大,说明疏水作用是主要的吸附机理,但其吸附焓己超出范德华力的范围而在氢键的键能范围内,故氢键吸附也同时在起作用.在正己烷中,D152树脂对3种吸附质的吸附亲合性随N上甲基数的增加而减小,与水中呈相反的趋势,说明氢键作用是主要的吸附机理.在乙醇中,D152树脂对3种吸附质均无吸附,因为疏水作用和氢键作用均受到的乙醇抑制.在水中,吸附质与树脂间的氢键作用同样受到水的抑制,但氢键吸附却依然存在,说明水介质中氢键吸附和疏水吸附可能存在一种协同作用.在热力学上对水介质中氢键吸附和疏水吸附的协同作用给于合理的解释. 相似文献
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盐酸介质中TBP萃取树脂吸附金的研究 总被引:2,自引:0,他引:2
实验研究了TBP萃取树脂从盐酸介质中吸附金的行为,测定并讨论了溶液酸度、TBP含量和温度等因素对吸附的影响,确定了平衡方程式。对固定床吸附过程的破点时间进行了实验研究和分析,提出了估算的方法。 相似文献