| Title |
Zn-Al@LDH infused hydrochar as cathode catalyst for upgrading tetracycline degradation and hospital wastewater treatment: A synergy of Fenton-like and bio-electrochemical systems |
| ID_Doc |
13760 |
| Authors |
Yadav, S; Ahmad, A; Gulati, C; Ghangrekar, MM; Dubey, BK |
| Title |
Zn-Al@LDH infused hydrochar as cathode catalyst for upgrading tetracycline degradation and hospital wastewater treatment: A synergy of Fenton-like and bio-electrochemical systems |
| Year |
2024 |
| Published |
Journal Of Environmental Chemical Engineering, 12, 5 |
| Abstract |
The present investigation proposed a "Bio-electro-Fenton like (BEFL)" approach for the treatment of antibiotic (tetracycline, TC) containing wastewater. The system is modified using a uniquely developed cathode catalyst Zn-Al@layered double hydroxide (LDH) supported by low-cost carbonaceous material hydrochar (i.e., Zn-Al@LDH/HC), derived from anaerobic digestate and electrocoagulation sludge (waste materials). The result revealed nearly 96.90 +/- 0.25 % removal of 10 mg/L of TC as well as about 89.50 +/- 0.45 % abatement of total organic carbon (TOC) during 240 min of treatment time using Zn-Al@LDH/HC based BEFL system. Simultaneously, the chemical oxygen demand (COD) abatement in the anodic chamber (with glucose as substrate having COD of 1000 mg/L) was observed to be 85.16 +/- 0.50 %. In-situ hydrogen peroxide (46.2 +/- 1.2 mg/L as mean 4 h concentration) generation capability of the Zn-Al@LDH/HC was responsible for the outstanding performance of BEFL system. Additionally, the BEFL was also proficient in generation of bioelectricity (1141 +/- 25 mA/m(2)) via the microbial activity in the anodic chamber. Further, the technology was extended for TC degradation in presence of surfactants and real hospital wastewater to depict the effect of real field conditions on the performance of as-synthesized waste derived catalyst. Intermediate products formed, the mechanism of TC degradation, and the phytotoxicity assessment were also illustrated to confirm the negligible toxicity of the treated effluent. Overall, deriving the catalyst from waste materials would reduce the scale-up cost of the proposed technology, enhance environmental sustainability, and contribute to circular economy. |
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