非晶态合金催化剂的制备及催化降解含酚废水

发布时间：2018-06-16 13:37

  本文选题：非晶态合金 + Ni基催化剂　； 参考：《广州大学》2017年硕士论文

【摘要】：煤化工、石油化工厂、制药厂、苯酚及酚醛树脂生产厂等会产生大量的含酚废水,存在高毒性、难降解等缺点。同时,会对给水水源、水生生物也产生严重影响,酚具有一定毒性,会对微生物的生长速度造成明显影响。而目前对含酚废水的处理有吸附法、萃取法、氧化法、生物处理法等方法,处理过程中用到的催化剂几乎都难以达到稳定、可靠和安全的目的。基于非晶态合金催化剂的特点,以及目前含酚废水处理的现状,有必要研制出高活性和高稳定性的Ni基、Co基和Fe基等非晶态合金,以解决以上问题,实现环境效益和社会效益的双赢。本文通过化学还原法分别制备了Ni-Mo-P非晶态合金催化剂、Co-Fe-B非晶态合金催化剂,采用溶胶-凝胶法合成Fe-Al-P-O非晶态合金催化剂,对不同制备条件下的非晶态合金催化剂进行了X射线衍射(XRD)、比表面积-孔径分布测试(BET)、热重分析(TG)、程序升温还原(TPR)、程序升温脱附(TPD)、及光电子能谱(XPS)等系列表征,研究分析了超声波等因素对催化剂的结构、热稳定性、比表面与孔径分布、还原性能、吸氢性能以及形貌等方面的影响。研究了不同条件下制备的Ni-Mo-P非晶态合金催化剂、Co-Fe-B非晶态合金催化剂、Fe-Al-P-O非晶态合金催化剂结构特点及其对模拟含酚废水的催化降解性能,并探讨了其催化降解苯酚废水的工艺条件。结果表明:(1)超声波对Ni-Mo-P非晶态合金催化剂的结构产生影响,而且在超声25min,超声功率为70W条件下,催化剂的比表面积达到了333.8m2/g,使用此催化剂3g,反应时间为120min,反应温度100℃下,对苯酚的降解率达到了96.6%;(2)Fe的含量以及高温处理会对Co-Fe-B非晶态合金催化剂的结构产生影响,Fe的含量的增加使Co的电子结合能发生正移,而且在Fe/Co的质量比为0.2,温度为773k处理条件下,制备的Co-Fe-B非晶态合金催化剂非晶态结构较完善,使用此条件下制备的Co-Fe-B非晶态合金催化剂3g,反应时间为200min,反应温度100℃下,对苯酚的降解率达到了87.9%;(3)560℃条件下制备的Fe-Al-P-O非晶态合金催化剂仅是FePO4和AlPO4的混合,并没有新的物相产生。采用3克Fe-Al-P-O非晶态合金催化剂,反应时间100min,反应温度100℃下,对苯酚的降解率为57.1%。
[Abstract]:Coal chemical, petrochemical plants, pharmaceutical factories, phenol and phenolic resin production plants will produce a large number of phenol wastewater, high toxicity, difficult to degrade and other shortcomings. At the same time, it has a serious effect on water supply and aquatic organisms. Phenol is toxic to a certain extent and has a significant effect on the growth rate of microorganisms. However, the treatment of phenol wastewater by adsorption, extraction, oxidation, biological treatment and so on, the catalyst used in the treatment process is almost difficult to achieve the purpose of stability, reliability and safety. Based on the characteristics of amorphous alloy catalysts and the present situation of phenol wastewater treatment, it is necessary to develop high active and stable amorphous alloys such as Ni base Co base and Fe base in order to solve the above problems. To achieve a win-win environment and social benefits. Ni-Mo-P amorphous alloy catalyst Co-Fe-B amorphous alloy catalyst was prepared by chemical reduction method. Fe-Al-P-O amorphous alloy catalyst was synthesized by sol-gel method. The amorphous alloy catalysts prepared under different preparation conditions were characterized by X-ray diffraction (XRD), specific surface area pore size distribution (BET), thermogravimetric analysis (TGN), temperature programmed reduction (TPRT), temperature programmed desorption (TPD), and photoelectron spectroscopy (XPS). The effects of ultrasonic wave on the structure, thermal stability, specific surface and pore size distribution, reduction performance, hydrogen absorption and morphology of the catalyst were investigated. The structure characteristics of Ni-Mo-P amorphous alloy catalyst Co-Fe-B amorphous alloy catalyst and its catalytic degradation performance for simulated phenol wastewater were studied. The process conditions for the catalytic degradation of phenol wastewater were also discussed. The results show that the structure of Ni-Mo-P amorphous alloy catalyst is affected by ultrasonic wave, and the specific surface area of the catalyst reaches 333.8 m2 / g under the condition of ultrasonic 25 min and ultrasonic power 70 W, the reaction time is 120 min, the reaction temperature is 100 鈩，

本文编号：2026885