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合成了2-羰基丙酸-4-甲基苯甲酰腙(简称酰腙1)和2-羰基丙酸-4-硝基苯甲酰腙(简称酰腙2)两种酰腙化合物,采用红外光谱法和X射线单晶衍射法对其进行了表征,并将其应用于修饰MCM-41分子筛中。用两种酰腙修饰后的MCM-41分子筛吸附废水中的铬(Ⅵ),考察了吸附时间、溶液pH值、吸附剂用量和温度对吸附效果的影响,同时对吸附过程进行了热力学和动力学拟合。测试结果表明,在吸附时间为40 min,分子筛加入量为0.3 g,溶液pH值为6,溶液温度为20℃时,吸附效果最好,MCM-41-酰腙1和MCM-41-酰腙2对铬(Ⅵ)的去除率分别可以达到97.6%和98.2%。吸附过程是熵减小的放热过程,反应过程分别遵循准一级反应和准二级反应动力学。
Two kinds of acylhydrazone compounds were synthesized by using 2-oxopropionic acid-4-methylbenzoyl hydrazone (acyl hydrazone 1) and 2-oxopropionic acid-4-nitrobenzoylhydrazone IR spectroscopy and X-ray single crystal diffraction were used to characterize MCM-41 zeolite. Two kinds of acylhydrazone modified MCM-41 molecular sieves were used to adsorb Cr (Ⅵ) in wastewater. The effects of adsorption time, pH value, amount of adsorbent and temperature on the adsorption were investigated. Meanwhile, thermodynamics and kinetics Learn to fit. The results showed that the adsorption was best when the adsorption time was 40 min, the molecular sieve loading was 0.3 g, the pH value was 6, and the solution temperature was 20 ℃. MCM-41-acylhydrazone 1 and MCM-41-acyl hydrazone 2 on the chromium (Ⅵ) removal rates can reach 97.6% and 98.2%. The adsorption process is an exothermic process with reduced entropy. The reaction process follows the quasi-first-order reaction and quasi-second-order reaction kinetics, respectively.