Scholarlink

<p>Barium contamination in industrial wastewater, particularly from refractory, ceramic, and oil-gas related industries, poses serious environmental and health risks due to its toxicity and persistence. In this study, a novel and cost-effective calcium alginate/manganese dioxide (CaAlg/MnO₂) nanosorbent was synthesized and applied for the selective removal of Ba<sup>2</sup>⁺ ions from aqueous solutions and real industrial wastewater. MnO₂ nanoparticles were successfully immobilized within the calcium alginate hydrogel matrix through Ca<sup>2</sup>⁺‑induced crosslinking, forming stable composite beads. The synthesized nanosorbent was characterized using FTIR, XRD, FESEM-EDS, BET, and TGA analyses. Batch adsorption experiments demonstrated that Ba<sup>2</sup>⁺ removal was strongly influenced by solution pH, contact time, adsorbent dosage, and ionic strength. Under optimal conditions (pH 8, 25&#xa0;°C, 100&#xa0;min), a maximum adsorption capacity of 52&#xa0;mg&#xa0;g⁻<sup>1</sup> and a removal efficiency of 91% were achieved. Despite the relatively low BET surface area (2.18 m<sup>2</sup>&#xa0;g⁻<sup>1</sup>), the high adsorption performance was attributed to ion-exchange mechanisms and strong chemical interactions between Ba<sup>2</sup>⁺ ions and functional groups of alginate and MnO₂. Regeneration experiments confirmed good reusability, with more than 85% removal efficiency retained after five cycles. The results indicate that CaAlg/MnO₂ nanosorbent is an environmentally friendly and efficient material for barium removal from complex wastewater systems.</p> Graphical Abstract <p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Adsorption performance of barium from industrial wastewater using nano calcium alginate-manganese (IV) oxide beads

  • 期刊论文

  • 发表日期：

    2026年4月14日

查看全文
  • Shima Darzi,
  • Mojtaba S. Taleshi,
  • Fatemeh Elmi,
  • Hossein Ardeshir Geravi

摘要

Barium contamination in industrial wastewater, particularly from refractory, ceramic, and oil-gas related industries, poses serious environmental and health risks due to its toxicity and persistence. In this study, a novel and cost-effective calcium alginate/manganese dioxide (CaAlg/MnO₂) nanosorbent was synthesized and applied for the selective removal of Ba2⁺ ions from aqueous solutions and real industrial wastewater. MnO₂ nanoparticles were successfully immobilized within the calcium alginate hydrogel matrix through Ca2⁺‑induced crosslinking, forming stable composite beads. The synthesized nanosorbent was characterized using FTIR, XRD, FESEM-EDS, BET, and TGA analyses. Batch adsorption experiments demonstrated that Ba2⁺ removal was strongly influenced by solution pH, contact time, adsorbent dosage, and ionic strength. Under optimal conditions (pH 8, 25 °C, 100 min), a maximum adsorption capacity of 52 mg g⁻1 and a removal efficiency of 91% were achieved. Despite the relatively low BET surface area (2.18 m2 g⁻1), the high adsorption performance was attributed to ion-exchange mechanisms and strong chemical interactions between Ba2⁺ ions and functional groups of alginate and MnO₂. Regeneration experiments confirmed good reusability, with more than 85% removal efficiency retained after five cycles. The results indicate that CaAlg/MnO₂ nanosorbent is an environmentally friendly and efficient material for barium removal from complex wastewater systems.

Graphical Abstract