Enhanced Removal of Sb (III) by Hydroxy-Iron/Acid-Base-Modified Sepiolite: Surface Structure and Adsorption Mechanism

To improve the removal of antimony (Sb) from contaminated water, sepiolite (Sep) was chosen as the feedstock, modified with an acid-base and a ferric ion to yield a hydroxy-iron/acid-base-modified sepiolite composite (HI/ABsep). The surface structure of the HI/ABsep and the removal effect of the HI/ABsep on Sb (III) were investigated using potassium tartrate of antimony as the source of antimony and HI/ABsep as the adsorbent. The structural features of the HI/ABsep were analyzed by SEM, FTIR, PXRD, BET, and XPS methods. Static adsorption experiments were performed to investigate the effects of adsorption time, temperature, adsorbent dosage, and pH on the Sb (III) adsorbed by HI/ABsep. This demonstrates that sepiolite has a well-developed pore structure and is an excellent scaffold for the formation of hydroxy-iron. HI/ABsep adsorption of Sb (III) showed the best fit to the pseudo-second-order model and the Freundlich model. The maximum saturated adsorption capacity of the HI/ABsep regarding Sb (III) from Langmuir's model is 25.67 mg/g at 298 K. Based on the research results, the HI/ABsep has the advantages of easy synthesis and good adsorption performance and has the potential to become a remediation for wastewater contaminated with the heavy metal Sb (III).

Automated summary

The study utilized sepiolite modified with hydroxy-iron and acid-base components to create the HI/ABsep composite, which showed good adsorption performance for removing Sb (III) from contaminated water. The maximum adsorption capacity of HI/ABsep for Sb (III) was found to be 25.67 mg/g. This research provides a potential solution for treating wastewater contaminated with the heavy metal Sb (III).