Shaopeng Zhang,Jie Ding,Dayong Tian,Jing Wang,Jiale Zhang,Minghua Lu
China faces severe antimony pollution due to long-term, high-intensity mining and smelting operations. Long-term exposure to Sb(III) can lead to chronic respiratory problems. Adsorption method is used to remove Sb(III) because of its simplicity, economy and high efficiency. Therefore, a novel MIL-101(Fe)-Cl/SA hydrogel with oxidation-sorption bifunctionality was developed. 1602 cm −1 and 1025 cm −1 correspond to N H and S = O indicate N-chlorosulfonamide is bonded to MIL-101(Fe)-Cl/SA. MIL-101(Fe)-Cl/SA exhibited rough and wrinkled surfaces with numerous irregular particles by SEM. The presence of O (22 %) and Cl (2 %) confirmed the incorporation of N-chlorosulfonamide and SA into MIL-101(Fe)-Cl/SA by EDS and mappings. The adsorption capacities of MIL-101(Fe)-Cl/SA were 86 mg/g at 298 K and 123.21 mg/g at 328 K by Langmuir model. Kinetic and equilibrium correspond to pseudo-second-order and Langmuir model, respectively. Adsorption was spontaneous and endothermic by thermodynamic analysis. MIL-101(Fe)-Cl/SA exhibited enhanced selectivity in solution containing various ions. Moreover, MIL-101(Fe)-Cl/SA demonstrated potential for regeneration and reuse. The removal process primarily involved oxidation, electrostatic interaction, and complexation. In summary, the capability of MIL-101(Fe)-Cl/SA to adsorb and oxidize Sb(III) underscores its promising potential in mitigating the hazards associated with Sb(III).
Huawei Wang,Zijuan Lv,Yi Song,Ya-nan Wang,Daoyong Zhang,Yingjie Sun,Yiu Fai Tsang,Xiangliang Pan
Antimony(Sb(III)) contamination in wastewater has raised global concerns due to its high toxicity. The efficiency and mechanisms of Sb(III) adsorptive removal from wastewater with environmentally-friendly biogenic Mn oxide (BMO) materials as adsorbent were investigated, based on kinetic experiments and multispectroscopic analyses. Kinetic experiments showed that after 300 min of reaction, 97.79–100% of Sb(III) and 85.60–92.92% of total Sb were removed, indicating that BMO can quickly and effectively oxidize Sb(III) and sequester Sb(V) from water. The bacterial activity in BMO did not significantly affect Sb(III) removal, but a decrease in the release of Mn(II) into solution may provide new reactive sites for the re-oxidation of Sb(III). X-ray photoelectron spectrometer (XPS) high-resolution analysis suggested that Sb(V) was the only speciation remaining in the solid phase after the reaction of Sb(III) with BMO. X-ray diffraction (XRD) results further showed that the fast oxidation of Sb(III) by BMO led to the production of Mn(II) antimonate (Mn 2 Sb 2 O 7 ) precipitates. Successive extraction experiments confirmed that residual fraction (67.49–83.62%) and Mn oxide bound fraction (13.18–29.72%) were the dominant fractions of Sb(III) after 300 min of reaction, which were relatively stable and had low leaching risks. These findings indicated that BMO performed well in removing Sb(III) from wastewater.
Nana Xiong,Peng Wan,Guocheng Zhu,Fubing Xie,Shengnan Xu,Chuanqu Zhu,Andrew S. Hursthouse
A series of environmental and health problems caused by the release of large quantities of antimony into the water environment have received wide social concern in a number of regions worldwide. Finding a feasible treatment technology is the best choice for the sustainable remediation of antimony pollution. A novel nano-modified chitosan (NMCS) was prepared by grafting iron oxide nanoparticles (Nano-Fe 3 O 4 ) and carboxylate metal organic frameworks (MOFs) denoted as MIL-100(Fe) onto chitosan. The NMCS before and after adsorption was characterized by analytical tools including Fourier transform infrared and X-ray photoelectron spectroscopy. Batch experiments with variable NMCS dose, solution pH, and competing anions were used to evaluate the most efficient way to remove Sb (III) from aqueous solutions. The results showed that removal efficiency increased with the increase of the NMCS concentration and solution pH, respectively. The maximum removal efficiency of Sb(III) was 96.8%, at pH 11 with 1.5 g/L of NMCS when treating a Sb(III) model solution of 10 mg/L, which is much higher than that with Nano-Fe 3 O 4 or MOFs. Compared with the efficient removal of Sb(III) under acid conditions, NMCS has a higher removal efficiency under alkaline conditions. The effect of common anions such as sulfate, carbonate, nitrate and chloride ions, on the removal of Sb(III), was minor. The removal of Sb(III) could be clearly described by pseudo-second order sorption kinetics and Freundlich isotherm, which suggested inner-sphere surface binding mechanisms. The presence of Sb (III) on NMCS was confirmed by an X-ray photoelectron spectroscopic analysis, and those functional groups binding to Sb (III) were identified using Fourier transform infrared analysis. The ability of NMCS to be regenerated was good and further enhanced by the possibility of magnetic recovery. Overall, the findings tested in this study showed that the NMCS developed can effectively remove Sb(III) from aqueous solutions and can be effectively recovered and reused.
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