Dissertation > Excellent graduate degree dissertation topics show

The Study of Catalytic Hydrogenation of Aqueous Bromate Over Two Palladium Loaded Mesoporous Materials

Author: ZhangPeng
Tutor: JiangFang
School: Nanjing University of Technology and Engineering
Course: Environmental Engineering
Keywords: Bromate hydrogenation mesoporous material Pd/MCN Pd/MCM-41-NH2
CLC: R123.6
Type: Master's thesis
Year: 2014
Downloads: 13
Quote: 0
Read: Download Dissertation

Abstract


Disinfection of drinking water is one of the most effective for public health, it can remove most of the pathogenic microorganisms and prevent the epidemics. However, in the process of drinking water disinfection, some disinfection byproducts may arise and pose a potential threat to human health. Bromate is a typical byproduct of drinking water disinfection, because of its carcinogenicity to human, bromate has been classified as2B carcinogens by the World Health Organization (WHO) and also be strictly regulated by many countries. In2004, the WHO had revised the limit bromate of drinking water from25μg/L to10μg/L. Thus, developing an effective method to remove the bromate in drinking water is imperative.Catalytic hydrogenation method has been considered as one of the promising technologies for bromate removing beacause of its high efficiency, nonbyproducts, and convenience to industrialization&good selectivity compare to normal means. But relevant study and catalysts are scarce. In this paper, catalysts were prepared with two different kinds of mesoporous materials, and its application in bromate reduction was studied in details. To investigate the properties of the catalysts, many characterization methods were performed, such as N2adsorption-desorption, X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), H2chemical adsorption, Transmission electron microscopy (TEM) and etc. The main results have been obtained as follows:(1) The mesoporous carbon nitride supported Palladium catalyst (Pd/MCN) was systhesied via impregnation method with PdCl2as precursor and MCN as support. Characterization results indicated that the Pd/MCN has excellent BET surface area (802.67m2/g), well-ordered mesoporous structure, and the Pd particles were well dispersed on the surface of MCN; the point of zero charge of Pd/MCN is around8.0. The experimental results revealed that the adsorption of the bromate was the prerequisite step of the bromate hydrogenation reduction as a result of the reaction in accordance with the Langmuir-Hinshelwood mechanism. Pd/MCN exhibited higher catalytic activity in the reduction of bromate compare to Pd/AC and Pd/CMK. For the Pd/MCN,0.78125mM bromate will be fully reduced in50min at the catalyst concentration is0.03g/L, and increasing the Pd loading amount and catalyst concentration will enhance bromate reduction efficiency. The bromate reduction was strongly pH-dependent and coexsting ions will suppress the hydrogenation process.(2) The magnetic catalyst (Pd/MCM-41-NH2) was synthesized with amino-functionalized magnetic mesoporous silica (MCM-41-NH2) as support and PdCl2as precursor. Characterization results revealed that the amino groups were successfully grafted onto the support’s surface, the Pd/MCM-41-NH2has huge BET surface area, well-ordered mesoporous structure, and the catalyst can be easily separated from water with the magnetization of6.2620emu/g. The experimental results showed that the bromate reduction on Pd/MCM-41-NH2was also accordance with the Langmuir-Hinshelwood mechanism. Pd/MCM-41-NH2exhibited highr catalytic efficiency compared with the catalysts prepared using non-porous silicon materials (SiO2&SiO2-NH2) as support. The catalytic activity of Pd/MCM-41-NH2for reached the maximum when the ratio of MCM-41and silylating reagent dosage was1:0.25. After recycled for5times, the catalysts can still remain its80.75%activity, indicating that the catalyst has excellent stability and can be reused.In conclusion, the bromate can be effectively removed by mesoporous supported Pd catalyst via catalytic hydrogenation. The technology of hydrogenation can be hopefully served as an efficient way for remove bromate and other similar pollutants.

Related Dissertations

  1. Study on Using Sepiolite As Supported Catalysts in Selective Hydrogenation of Cinnamaldehyde to Cinnamyl Alcohol,O643.32
  2. Ni / TiO 2 -SiO 2 Preparation, Characterization and Hydrogenation of Maleic Anhydride,TQ225.2
  3. High hydrothermal stability of nickel-based catalyst and hydrogenation of butyne diol,TQ223.162
  4. Metallic Nanomaterials: Synthesis and Catalytic Application,TB383.1
  5. Preparation and Catalysis of Supported Nano-platinum Catalysts,O643.36
  6. Catalytic Transfer Hydrogenation of Biodiesel in Aqueous Media,TE667
  7. Research on the Asymmetric Transfer Hydrogenation of 2-aroyl-1-tetralones and Bis(aroylmethyl)sulfones and Sulfides,O621.25
  8. Synthesis, Characterizations and Catalysis of Mesoporous Carbon Material Supported Metal Catalysts,O643.36
  9. Study of Assembled PT-Fe Nano-Catalyst for the Selectivity Hydrogenation,TE624.93
  10. Study of Succinic Anhydride Prepared by Selectivity Catalytic Hydrogenation of Maleic Anhydride,TQ225.23
  11. Preparation and Catalysis of Supported Palladium Nanoparticles Catalyst for Hydrogenation of 2-tertiary Butyl Anthraquinone to Produce H2O2,TQ123.6
  12. Study on the Kinetics of Acetic Acid Hydrogenation to Ethanol,TQ223.122
  13. Research on Shenhua High Intertinite Coal Hydro-liquefaction Reaction,TQ529
  14. Steady-state, Dynamic Simulation and Optimization of Acetylene Hydrogenation Reactor in Ethylene Plant,TQ221.211
  15. Study on Hydrogenation and Characterization of Recycle Solvent for High Inertinite Shenhua Direct Coal Liquefaction,TQ529.1
  16. Research of Hydrogen Peroxide Production Process by Anthraquinone Method and 35% Hydrogen Peroxid Production Technology,TQ123.6
  17. Light Hydrocarbon Synthesis from Syngas on Fe-based Catalyst,TQ426.94
  18. Catalytic Hydrogenation of P-Phenylenediamine to Prepare Diaminocyclohexane over Raney-Ni,TQ236
  19. Research on Calcium Magnesium Bioactive Materials for Bone Regeneration,R318.08
  20. Study on the Benzene Selective Hydrogenation over Rur Catalyst Supported on the mesoporous Molecular Sieve,TQ426.94
  21. Coupled silicon and silicon tetrachloride hydrogenation reaction of trichlorosilane Process,O613.72

CLC: > Medicine, health > Preventive Medicine,Health > Environmental health,environmental medicine > Water and water supply sanitation > Water Supply and Health > Water purification and disinfection
© 2012 www.DissertationTopic.Net  Mobile