排序方式： 共有14条查询结果，搜索用时 312 毫秒
1.
土酸溶液中十六烷基三甲基溴化铵对锌的缓蚀作用及吸附热力学研究 总被引：1，自引：0，他引：1
用失重法研究了土酸溶液中十六烷基三甲基溴化铵对锌的缓蚀作用,发现十六烷基三甲基溴化铵在锌表面上的吸附是产生缓蚀作用的重要原因,且吸附规律服从Langmuir吸附等温式.用Sekine方法处理实验数据,从而获得了吸附过程△H0、△S0和△G0等一系列重要热力学参数. 相似文献
2.
Photocatalytic reduction of 6-chloro-3-nitrotoluene-4-sulfonic acid （CNSA） was studied in UV-irradiated TiO2 suspensions in the presence of methanol and surfactants. A mixture of CNSA, TiO2, water, additives and surfac- tants was put into a quartz glass reactor with a jacket, which was irradiated with a high pressure Hg lamp in the purg- ing of nitrogen gas. With methanol, the conversion of CNSA increased from 7.7% to 34.6%. Three surfactants signifi- cantly promoted the photocatalytic reduction conversion in reduced order of sodium dodecylbenzenesulfonate （DBS）, cetyltrimethylammonium bromide （CTAB） and sodium dodecylsulfate （SDS）. In suspensions involving DBS and CTAB respectively, CNSA conversion increased in consistence with the adsorption ratio with methanol, but varied inversely with the adsorption ratio without methanol. But no obvious influence on the adsorption ratio was observed with or without methanol added when the SDS concentration was critical micelle concentration （cmc）. The photocata- lytic reduction of CNSA was enhanced in UV-irradiated TiO2 suspensions in the presence of methanol and surfactants. Methanol inhibited the recombination of photogenerated holes and electrons efficiently. Surfactants around 1 cmc led to the highest reduction conversion. 相似文献
3.
用简易荧光计研究了在碱性介质中,银-硫化钠-十六烷基三甲基溴化铵体系的共振散射光谱,考查了它们的光谱特征、影响因素和适宜的反应条件;确定了散射光强度与溶液中银浓度的关系,提出了共振光散射法测定银的方法.该法在室温下进行,操作方便,具有较高的灵敏度;线性范围为0.0～6.0μg/mL,方法的捡出限为0.041μg/mL;用于环境水样中银浓度的测定,结果满意。 相似文献
4.
探讨了在有机化学实验教学中,以甲苯为原料,以十六烷基三甲基溴化铵为相转移催化剂合成苯甲酸的反应.对反应过程中的影响因素进行了讨论.实验结果表明,本法与传统方法相比可有效地缩短反应时间,提高反应产率. 相似文献
5.
Removal of chromium (VI) dissolved in water by intermittent foam separation was implemented with cetyl trimethy-ammonium bromide
as surfactant. The influence of various factors on removal efficiency was systematically studied. The removal efficiency has
a maximum value near pH 4.0; thus, most experiments were carried out at pH 4.0. The orthogonal experiment was conducted to
confirm the optimal operating parameters. The orthogonal experimental results show that when the liquid feed concentration
is 10 mg/L, the pH value of feed solution is 4.00, air flow rates 0.9 L/min, surfactant dosage is 300 mg/L, the maximum removal
efficiency of chromium (VI) reaches 97.80%, and condense multiple reaches 1 711. The kinetic test indicates that the foam
separation of chromium is a first-order process. The equivalent rate constant calculated from the slope is 0.406 4, and the
equivalent rate equation is obtained. 相似文献
6.
以固体十六烷基三甲基溴化铵为相转移催化剂，冰醋酸和正己醇为原料合成乙酸正己酯，考察了催化剂用量，反应时间，酸醇犀尔比对酯产率的影响。结果表明：催化剂用量为物料总用量的5％，反应时间为120min，酸醇摩尔比为1．4：1，反应温度为109～120℃时，产率可达82．90％。 相似文献
7.
8.
《商丘师范学院学报》2009,25(9):20-20
以具有一定活性的偏高岭土兼作铝源与硅源,正磷酸作磷源,三乙醇胺和十六烷基三甲基溴化铵为复合模板剂,采用分段晶化的方法水热合成了高硅磷酸硅铝分子筛（SAPO-5）．利用X射线衍射分析（XRD）、红外光谱分析（FTIR）、扫描电镜（SEM）、^29Si,^27Al MAS NMR（固态核磁共振）、X光电能谱（XPS）,吸附氨的程序升温脱附（NH3-TPD）等手段对产物进行了表征． 相似文献
9.
刘兆明 《临沂师范学院学报》2001,23(4):41-43
提出了一种新的痕量金属测定方法，采用二苯酮作吸附剂，在室温30℃下，吸附分离铁、钴、铜与亚硝基R盐和CTMAB形成的三元配合物，用原子吸收法进行测定。 相似文献
10.
以双硫腙作指示剂,以十六烷基三甲基溴化铵(CTMAB)作增溶增敏剂,以Hg2 作滴定剂光度滴定微量S2-,检测波长为540m,研究了指示剂和CTMAB的用量等因素对滴定结果的影响。应用该法测定了炼油厂副产氨气中的微量硫化物,回收率在94％-96％之间。 相似文献