Upcycling chemical polishing effluent into a hierarchical CSH-CH composite for rapid multi-metal removal and phytotoxicity mitigation.

Upcycling chemical polishing effluent into a hierarchical CSH-CH composite enables rapid removal of five heavy metals within 30-60 minutes, offering an effective remediation tool.

• Why it matters: Disposal of hazardous industrial effluents and contamination of water sources with multiple metals pose significant environmental and health risks, requiring sustainable solutions.
• What they did: The study converted authentic chemical polishing effluent into a calcium silicate hydrate-calcium hydroxide composite that exploits its chemical signature for dual-cation exchange and multi-metal adsorption, tested with hydroponic pea seedlings.
• The result: The CSH-CH composite significantly reduced metal bioavailability and translocation in plants, alleviating phytotoxicity and demonstrating a low-cost, biosafe approach for multi-metal wastewater treatment.