Preparation method of charcoal-loaded zero-valent iron catalytic material

Abstract

The invention discloses a preparation method of a charcoal-loaded zero-valent iron catalytic material. The preparation method comprises the following steps: diping dry hydrothermal carbon in an iron nitrate solution, uniformly stirring and mixing, filtering, drying, and performing the pyrolyzation for 30 to 40 minutes in a nitrogen environment under the condition of 700 to 800 DEG C, thus obtaining the charcoal-loaded zero-valent iron catalytic material. The load-type charcoal catalytic material is prepared by adopting a carbon thermal reduction method, charcoal is used as a carbon source, noreducing agent is added, while the charcoal is generated by pyrolyzation, nanometer zero-valent particles can be formed in site in one step, the process is simple, the cost is reduced, the prepared charcoal-loaded zero-valent iron catalytic material has a good effect of eliminating and reducing nitrobenzene, and the removal rate for the nitrobenzene in 6 hours can reach 90 percent or above.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment and environmental catalysis, and relates to a preparation method of a biochar-loaded zero-valent iron catalytic material. Background technique [0002] Nitrobenzene is a common chemical raw material, mainly used in pharmaceutical synthesis, dyes, explosives, pesticides, etc. Due to the rapid development of synthetic dyes, pharmaceuticals and other industries, the amount of wastewater discharge has increased sharply. In addition, leakage in the process of wastewater treatment, accident discharge and leakage of leachate in the process of sludge disposal have resulted in a large amount of nitrobenzene compounds. Enter surface water and ground water environment. Therefore, effective treatment methods for nitrobenzene wastewater are urgently needed. At present, the commonly used methods can be divided into physical methods, chemical methods, biological methods and composite treatment met...

AI Technical Summary

Problems solved by technology

However, zero-valent iron itself is easy to agglomerate and oxidized. Loading zero-valent iron on the carrier increases the dispersion of zero-valent iron, which can overcome its shortcoming of easy agglomeration.

CN 101811048A Simple mixing of effective components such as zero-valent metals, organic carbon sources, and porous media, but the binding force between components is weak, the synergistic strengthening effect is not significant, and agglomeration oxidation, secondary pollution, and blockage will still occur question

CN 101219832 A Use polyvinyl alcohol, cement and other embedding agents to physically embed and fix effective components, but common embedding agents have disadvantages such as high cost, poor mechanical strength, weak slow-release ability, and unfriendly environment, which reduces the The stability, effectiveness and practical applicability of

CN105854797 A The prepared biochar is modified by NaOH solution and immersed in a mixed solution of ferrous sulfate and polyethylene glycol, and sodium borohydride is added dropwise while ultrasonicating to obtain a nanometer zero-valent iron biochar-based material, which is filtered and washed Afterwards, silver nitrate solution is added dropwise to obtain nanometer zero-valent Ag / Fe bimetallic biochar adsorbent, which is applied to the treatment of carbon tetrachloride-containing wastewater. The combination of metal particles and biochar is not strong enough, it is easy to fall off, and the material performance is unstable

Images