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Facile Synthesis of CuZn-LDH/C3N4 Heterojunction for Efficient Tetracycline Hydrochloride Adsorption From Wastewater
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DOI：10.1002/cctc.70906.png)
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Abstract
En 中文
The effective elimination of residual antibiotics from anthropogenically derived wastewater remains a significant challenge. To address this issue, a series of CuZn layered double hydroxide/carbon nitride (denoted as CuZn/CN-x) heterojunction adsorbents with varying CuZn/CN ratios was fabricated through a facile one-step hydrothermal protocol. These materials were comprehensively characterized using multiple analytical techniques, and their adsorption performances were assessed for the removal of tetracycline hydrochloride (TC). Experimental results showed that all synthesized CuZn/CN-x composites exhibited typical hydrotalcite-like structures and graphite-like conjugated frameworks. Under optimal conditions, the maximum adsorption capacity of the CuZn/CN-150 reached 3841 mg·g‒1. Thermodynamic and kinetic investigations demonstrated that the adsorption process followed the pseudo-second-order kinetic and Langmuir isotherm models, suggesting a spontaneous and endothermic reaction that is susceptible to solution pH and coexisting ions. The adsorption mechanism was found to be driven by the synergistic effect of multiple interactions, including electrostatic attraction, hydrophobic interaction, and weak metal complexation. Moreover, the CuZn/CN-150 sample displayed outstanding recyclability and structural stability, maintaining a TC removal efficiency of over 90% even after 10 successive adsorption-desorption cycles. This study offers novel technical perspectives and promising research avenues for the remediation of antibiotic-polluted water environments.
Keywords:
adsorbents
antibiotics
CuZn/CN
heterojunction
tetracycline hydrochloride
thermodynamic and kinetic
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2.5W
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