TM-LDH/TZ was synthesized by co-precipitation and triazole grafting to remove As(V) and Congo red simultaneously at pH 5 and 25°C. Maximum Langmuir capacities were 204.75 mg/g for As(V) and 499.72 mg/g for dye. Kinetic models supported chemisorption and AMM analysis indicated spontaneous adsorption under tested conditions. The pollutant-loaded material then produced a UOR peak current density of 184.67 mA/cm², nearly twice the fresh material, with 1.19-ohm resistance and over 85% removal after three regeneration cycles.
Key findings
- Simultaneous capacities reached 204.75 mg/g As(V) and 499.72 mg/g dye; Elovich and pseudo-second-order models supported chemisorption; spent material reached 184.67 mA/cm² with 1.19-ohm resistance; removal stayed above 85% for three cycles.
Why this matters globally
Repurposing spent adsorbent as catalyst could reduce secondary waste and connect water treatment with urea-assisted energy or hydrogen systems, provided pollutant and metal release are safely controlled.
Thai researcher contribution
Rehab Mahmoud is affiliated with Chulalongkorn University in the international materials team, linking a Thai institution to circular water-remediation research; individual roles are not specified in the abstract.
Limitations to consider
Batch tests with As(V) and Congo red do not represent real wastewater matrices. Langmuir capacity is a model estimate, not column throughput. Reusing contaminated material as electrocatalyst requires leaching, product-safety and durability evidence well beyond three cycles.