Sulfonated iron-copper bimetal composite material as well as preparation method and application thereof

Abstract

The invention provides a sulfonated iron-copper bimetal composite material as well as a preparation method and application thereof. The sulfonated iron-copper bimetal composite material is micron-sized particles, the theoretical mass ratio of copper to iron is (0-0.125):1, the theoretical molar ratio of sulfur to iron is (0-0.140):1, and the sulfonated iron-copper bimetal composite material has alarge specific surface area and a good reduction effect. The preparation method for the sulfonated iron-copper bimetal composite material mainly comprises a replacement reaction step and a reaction step of enabling ferrous sulfide generated by iron and sulfur coprecipitation to be attached to the surface of the material so as to replace an oxide layer on the surface of the material. Compared withoriginal iron powder, the composite material has the advantage that the activity of the original iron powder is greatly improved; and compared with iron-copper bimetal, the composite material has theadvantage that the reduction effect is better; and in the preparation process of the composite material, due to the generation of the ferrous sulfide, the reduction effect of iron powder on hexavalentchromium is greatly improved, and the preparation method is an efficient and economical preparation method.

Description

technical field [0001] The invention belongs to the field of environmental restoration, and in particular relates to a sulfonated iron-copper bimetallic composite material and a preparation method and application thereof. Background technique [0002] Hexavalent chromium (Cr(VI)) is a common pollutant in soil and groundwater. Commonly found in wastewater from electroplating, metal finishing, pigment manufacturing, tanneries and chrome mining operations. Hexavalent chromium is carcinogenic to humans and animals, and it can cause dermatitis, rhinitis, and even lung and nasopharyngeal cancer. In the aqueous environment, due to the high mobility of Cr(VI), there may be increased exposure and hazards to human health and the environment. In contrast, trivalent chromium Cr(III) has low mobility in the environment and low toxicity; in addition, Cr(III) is also a nutrient required by humans and animals, so reducing Cr(VI) Cr(III) is environmentally favorable and can be used to rem...

AI Technical Summary

Problems solved by technology

Studies have shown that reducing the size of zero-valent iron can increase the utilization and activity of zero-valent iron, but it will lead to a decrease in electronic efficiency; at the same time, it has been found that the composite material of zero-valent iron can slow down the water corrosion of zero-valent iron, thereby improving the zero-valent iron. Reaction selectivity

[0004] CN103979704A discloses a method for treating waste water containing hexavalent chromium with pyrite. The method mainly includes: passing the waste water containing hexavalent chromium with a pH value of 2.0 to 3.0 through coarse-grained pyrite and fine-grained pyrite. Second reduction, so that all the Cr(VI) in the wastewater is reduced to Cr(III), and then the pH of the wastewater is adjusted to be alkaline, so that the Cr(III) is completely precipitated; this method uses Fe 2+ Although the cost is low, the processing efficiency is low and the amount of raw materials required is large

[0005] CN105195758A discloses a preparation method and application of nanometer zero-valent iron-copper bimetallic particles. The preparation method mainly includes: (1) adding iron salt and copper salt into a three-necked flask according to a certain molar ratio; (2) taking a certain amount of Add the ethanol solution into the three-necked flask, and stir in a water bath at a constant temperature; (3) Add the borohydride salt solution into the three-necked flask, stir for 10-40 minutes, and filter the precipitate to obtain The prepared material; the material in this patent uses iron and copper to form a primary battery to improve the activity of zero-valent iron and increase the utilization efficiency of zero-valent iron, but the material also has a passivation layer formed too fast, and the The problem of reduced reaction selectivity

Images