Preparation Of Hydroxyl Iron Oxide Composite And Its Removal Of Sulfur Ions In Water

With the development of industrial technology,the problem of environmental pollution has become more and more serious.Especially in industries closely related to daily life such as oil refining,petrochemicals,pharmaceuticals and tanning,a large amount of S^2-containing wastewater will be produced in the production process,which can corrode metal materials and emit odorous gases,have caused great harm to the environment and human health.At present,the removal of sulfide in wastewater mainly includes precipitation,absorption and biological methods,but the application of adsorption technology is relatively small.In view of this,this article intends to prepare an adsorption material to remove S^2-in wastewater,the research can be used for the treatment of industrial sulfur-containing wastewater and has certain practical value.In this paper,the Fe²⁺ salt and the three carbonates are used as the precipitating agent to prepare the hydroxyl iron oxide,and the S^2-water sample is used as the target pollutant,and the S^2-performance test is carried out on the hydroxyl iron oxide.The results show that hydroxyl iron oxide prepared with NH₄HCO₃as the precipitant has the best performance in removing S^2-,and the highest removal rate is 54.2%.Using Fe Cl₃solution as raw material,Na OH solution as precipitant,and SDS as dispersant,hydroxyl iron oxide was prepared by hydrothermal synthesis method.The results show that the removal effect of S^2-by the hydrothermal method is better than that of the precipitation method,and the removal rate is 64.5%.The adsorption and removal of S^2-by FeOOH@ZnO prepared by adding nano-ZnO in the hydrothermal process further increased.When the hydrothermal reaction temperature is 110?,the molar ratio of SDS/Fe is 0.006:1,and the molar ratio of Fe/Zn is 4.0:1,the adsorption and removal rate of S^2-by FeOOH@ZnO can reach 87.5%in 60min adsorption time.Structural analysis shows that the addition of SDS and nano-ZnO changes the main component of hydroxyl iron oxide from rods to particles,and nano-ZnO and FeOOH form a wrapped desulfurizer,which increases the specific surface area and is more conducive to the removal of sulfur ions,and in the process of adsorption and removal,ferrous precipitates appear.In order to reduce the loss of the FeOOH@ZnO powder material and to broaden the industrial application range,the modified zeolite loaded FeOOH@ZnO material is prepared by the impregnation method,then the removal of S^2-and the effect of phosphate and sulfite ions on the adsorption of FeOOH@ZnO supported on zeolites were also discussed.The results show that a large number of pores appear on the surface of the zeolite treated with HNO₃,and the adsorption performance of S^2-after loading the active component is significantly better than that of Na OH and Zn Cl₂modified zeolite,when the zeolite was modified with 15%HNO₃for 24 hours,and the solid-liquid ratio was 3:5,the zeolite was immersed for 36 hours,and then the zeolite-supported FeOOH@ZnO prepared by hydrothermal reaction has the best performance for adsorbing S^2-,with a removal rate of 94.2%.The presence of interfering ions will affect the adsorption and removal performance of the material,but the sulfur ion removal rate can also be stabilized at about 80%,which fully improves the utilization rate of FeOOH@ZnO active components.