Details

Autor(en) / Beteiligte

• Wu, Ai
• Jia, Xiuxiu
• Zhang, Kai
• Shao, Jiahui
• Mao, Jingtao
• Yang, Zhihua
• Duan, Zhengda
• Chen, Wen-Tong
• Chang, Fengqin
• Wang, Shixiong
• Hu, Guangzhi

Titel

Environmentally friendly zero-valent iron-modified biochar beads for high-performance antimonite removal from aqueous solution

Ist Teil von

• Journal of cleaner production, 2024-07, Vol.460, p.142534, Article 142534

Ort / Verlag

Elsevier Ltd

Erscheinungsjahr

2024

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Antimony (Sb) contamination in aquatic environments has emerged as a significant environmental concern because of extensive industrial activities involving Sb and its associated health hazards. Nano-zero-valent iron (nFe) is recognised for its efficacy in heavy metal remediation; however, its application is often hindered by poor dispersion and suboptimal adsorption properties. We designed an innovative approach in which nFe is calcined with biochar to mitigate agglomeration and subsequently amalgamated with sodium alginate to form composite gel spheres (PEI/SA/BCFe) in a calcium chloride solution. The ability of these gel spheres to remove antimonite (Sb(III)) from water was evaluated under various conditions, including pH, initial concentration, the presence of competing ions, temperature, and cycling experiments. The R2 fitted to the Langmuir isotherm were 0.99, 0.96 and 0.97, respectively. The adsorption was carried out under thermostatic shaking conditions, and the maximum adsorption capacity was 621.04 mg g−1, 509.34 mg g−1, and 373.10 mg g−1 at 10, 25, and 40 °C, respectively, which corresponded to removal efficiencies of 72.5%, 65.3% and 63.7%, respectively. The underlying mechanisms driving the adsorption process were primarily attributed to the oxidation of Sb(III), inner-sphere complexation, and coprecipitation. This comprehensive study not only highlights the potential of PEI/SA/BCFe as an effective solution for mitigating antinomy contamination in water but also contributes valuable insights into the mechanistic aspects of heavy metal adsorption. •A novel adsorbent (PEI/SA/BCFe) for Sb(III) removal was obtained.•The maximum adsorption of Sb(III) at 25 °C was up to 509.34 mg g−1.•The removal of Sb(III) is related to oxidation-complexation- precipitation.•PEI/SA/BCFe is easily separated and recovered.•PEI/SA/BCFe can be cycled 5 times for Sb(III) adsorption.