Method for removing nitrobenzene in water

Abstract

The invention discloses a method for removing nitrobenzene in water, which comprises the following steps: respectively taking a hexagonal plate short-pore Zr-Ce-SBA-15 ordered mesoporous silicon material and a fibrous long-pore SBA-15 ordered mesoporous silicon material as carriers, synthesizing a nano zero-valent iron composite material by adopting an equivalent-volume impregnation-hydrogen reduction method, and investigating the reduction performance of the nano zero-valent iron composite material on nitrobenzene. Results show that after the reaction is carried out for 12 hours, the removal rate of the NZVI / Zr-Ce-SBA-15 on nitrobenzene is higher than that of the NZVI / SBA-15 on which the nanoscale zero-valent iron is not loaded, and the reduction capacity of the NZVI / Zr-Ce-SBA-15 on nitrobenzene is improved compared with that of the NZVI / SBA-15. According to the method, an NZVI / Zr-Ce-SBA-15 composite material with the iron mass fraction of 15% is adopted, and when the adding amount is 1 g / L, the initial concentration of nitrobenzene is 20 mg / L and the pH value is 3, the removal rate of nitrobenzene in the solution is 98%, and the generation amount of a reduction product aniline is 11.8 mg / L.

Description

technical field [0001] The invention belongs to the field of nitrobenzene wastewater treatment, and in particular relates to a method for removing nitrobenzene in water. Background technique [0002] Nano-zero-valent iron (NZVI) has the characteristics of small particle size, high reactivity, and its own and its reaction products are environmentally friendly. It has unique advantages and good application prospects in water pollution remediation. At present, it has achieved good results in the reduction of organic chlorides, nitroaromatic compounds, and heavy metal ions. [0003] As an important organic intermediate, nitrobenzene (NB) is widely used in industries such as dyes, spices, and explosives. Nitrobenzene has carcinogenic, teratogenic, and mutagenic risks, and its structure is stable and difficult to decompose. It is a refractory biodegradable compound and has been included in the list of priority pollutants in my country. Due to the refractory biodegradability of n...

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Problems solved by technology

[0006] Technical problem to be solved: For the above-mentioned existing nano zero-valent iron with small particle size and magnetic surface, it is very easy to agglomerate, which greatly reduces the specific surface area and reduces the reactivity, resulting in a decrease in degradation efficiency; the long channel of the carrier is not conducive to large Molecules diffuse in the pores. On the one hand, it makes it difficult for iron particles to enter the pores, and the degree of dispersion is not high. On the other hand, it also affects technical problems such as mass transfer speed when applied in water.

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