Abstract
FeOOH and FeOOH@ZnO were prepared by hydrothermal synthesis, and their structures and adsorption properties toward S2− were studied. The results showed that too high hydrothermal temperature was not conducive to the adsorption of S2−. However, using sodium dodecyl sulfate (SDS) for FeOOH preparation and adding nanometer ZnO (FeOOH@ZnO) could significantly improve the adsorption of S2− by FeOOH, and adsorption removal rate was close to 90.0% and adsorption amount was 87.5 mg·g−1. The structural analysis showed that the modification of FeOOH by SDS and the addition of nano-ZnO resulted in the reduction in size of the FeOOH particles, forming amorphous inclusion structure with ZnO present inside and FeOOH outside. The specific surface area of FeOOH@ZnO was found to be higher than that of FeOOH. Therefore, it is beneficial to the adsorption of S2−. XPS fitting results showed that ferrous deposits appeared in the process of adsorption of S2− by FeOOH@ZnO, and it was considered that the oxygen of Fe = O was replaced with sulfur.
Highlights
With the rapid development of industrial technology, the problem of environmental pollution has become progressively more serious
Adsorption performance of S2− on FeOOH prepared by adding sodium dodecyl sulfate (SDS) at different hydrothermal temperatures
The analysis indicates that when Zn element is doped into FeOOH in ionic form, Zn is mainly present as Zn(OH)2 because it has not been roasted at high temperature
Summary
With the rapid development of industrial technology, the problem of environmental pollution has become progressively more serious. Iron(III) oxide-hydroxide (FeOOH) exists widely in nature, and can be prepared in the laboratory by precipitation, hydrothermal synthesis, and sol–gel methods (Seabold et al, 2012; Liu et al, 2007; Kwong et al, 2016), due to its economic benefit and high reactivity. It has been widely used in environmental protection in recent years. It is a widely used gas fine desulfurizer in chemical production It has good adsorption effect on industrial waste gas containing sulfide; only a few studies are available on the adsorption of pollutants present in water. This research can provide new adsorption material for the removal of sulfide in wastewater, and has certain practical value
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