Method for preparing supported biochar catalysis material

Abstract

The invention discloses a method for preparing a supported biochar catalysis material. The method comprises the following steps: breaking and sieving dried biomass, charring the biomass at 500-800 DEGC to prepare biochar, impregnating the biochar in a polyethylene glycol 4000-containing FeSO4 solution in a nitrogen environment under a strong stirring condition according to a mass ratio of iron tothe biochar being not less than 1:1, dropwise adding a NaOH-containing sodium borohydride solution, and filtering, washing and freeze-drying the obtained reaction product after the reaction is finished in order to the biochar-supported nanometer zero-valence iron catalysis material. The supported biochar catalysis material BC-nZVI prepared in the invention has excellent removal and reduction effects on nitrobenzene wastewater, and allows the removal rate to reach 95% and the reduction rate to reach 80% within 6 h; the combination between the Fe and the biochar in the composite material is strong and highly stable, so long-term storage and no secondary pollution of the catalysis material are achieved.

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 loaded biochar catalytic material. Background technique [0002] Nitrobenzene is an important intermediate in organic synthesis and is widely used in organic synthesis industries such as dyes, spices, and explosives. With the development of the fine chemical industry, a large amount of nitrobenzene enters the environment. Nitrobenzene has a stable chemical structure and can exist in water for a long time. Nitrobenzene can be absorbed into the human body through the respiratory tract and skin, causing damage to the blood, liver, respiratory system and central nervous system, and can also cause toxic liver disease and fatty degeneration of the liver. Due to the persistence and great harm of nitrobenzene in the environment, it has been included in the list of "Priority Pollutants" by the US Environmental Protection A...

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Problems solved by technology

Document 1 (Jingchun Yan, etal. Biochar supported nanoscale zero-valent iron composite used as persulfate activator for removing trichloroethylene. Bioresource Technology 152 (2014) 538-542) uses sodium borohydride to reduce ferrous ions to zero-valent iron particles attached to However, due to the instability of sodium borohydride in aqueous solution, the loading capacity of zero-valent iron is small, and the performance is poor. When the material dosage is 0.5g / L and the reaction is 6h, only 8mg / L of trichloride can be reduced. Vinyl

Zhang Fushen et al. (Zhang Fushen, Liu Zhengang. The method for preparing Fe / C supported catalysts from waste biomass: CN101811048A[P].2010.) simply mixed effective components such as zero-valent metals, organic carbon sources, and porous media, but the components The binding force between them is weak, the synergistic strengthening effect is not significant, and problems such as agglomeration oxidation, secondary pollution and blockage will still occur.

Liu Shejiang et al. (Liu Shejiang et al. Carbon release materials and preparation method for nitrate nitrogen contaminated groundwater remediation: CN101219832A[P].2008.) Physically embed effective components with embedding agents such as polyvinyl alcohol and cement Fixed, but commonly used embedding agents have disadvantages such as high cost, poor mechanical strength, weak slow-release ability, and unfriendly environment, which reduces the stability, effectiveness and practical applicability of composite materials

Wu Hongwei et al. (Wu Hongwei et al. A preparation method and application of nano-loaded zero-valent bimetallic functional biochar: CN 105854797A[P].2016.) modified the prepared biochar with NaOH solution and impregnated it in ferrous sulfate In a mixed solution with polyethylene glycol, add sodium borohydride dropwise while ultrasonicating to obtain a nano-zero-valent iron biochar-based material, and add silver nitrate solution dropwise after filtering and washing to obtain a nano-zero-valent Ag / Fe bimetallic biochar adsorbent , and applied to the treatment of carbon tetrachloride-containing wastewater, the process is cumbersome, the method is complicated, the cost is too high, and the combination of metal particles and biochar supported by ultrasound is not strong enough, easy to fall off, and material properties are unstable

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