article · ACS Applied Nano Materials
A nanocomposite, 1,2,4,5-benzene tetracarboxylic acid-doped polyaniline/protonated carbon nitride (H4BTC-PANI/pC3N4), was fabricated through a two-step process. This material was then tested for its ability to remove Cr(VI) ions from water. Batch experiments showed that the composite achieved 97.1% chromium elimination within 90 minutes at pH 2, demonstrating a high adsorption capacity of 1229 mg·g–1, which exceeds many similar adsorbents. The adsorption process was found to be spontaneous and endothermic. Furthermore, the composite maintained significant adsorption capacity over five regeneration cycles, indicating excellent reusability. Monte Carlo calculations supported the experimental findings, suggesting this material is a promising, cost-effective solution for wastewater treatment.
Hexavalent chromium is a highly toxic pollutant in wastewater, posing significant environmental and health risks. This research offers a promising, cost-effective material with high efficiency and reusability for its removal, contributing to cleaner water and safer ecosystems.
This research presents an applied solution for removing hexavalent chromium from wastewater. The H4BTC-PANI/pC3N4 nanocomposite is identified as a cost-effective material with high efficiency and reusability, making it suitable for industrial wastewater treatment facilities. It appears to be near-market, offering a practical and promising technology for environmental remediation.
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This work outlines the fabrication of a nanocomposite, namely, 1,2,4,5-benzene tetracarboxylic acid-doped polyaniline/protonated carbon nitride (H4BTC-PANI/pC3N4) through a straightforward two-step process. Various advanced analytical tools validated the formation of the composite. Subsequently, the adsorption characteristics of the prepared composite for the uptake of Cr(VI) ions were assessed via batch adsorption experiments. Removal equilibrium and kinetic approaches clearly demonstrated the simulation of adsorption data via Langmuir and pseudo-second-order models. The thermodynamic analysis disclosed that the removal of Cr(VI) ions by the H4BTC-PANI/pC3N4 material was a spontaneous, endothermic procedure associated with an increase in surface site availability randomness. It was found that by using 0.25 g/L of adsorbent dose at pH 2, almost 97.1% of the chromium was eliminated within an equilibrium time of 90 min. Furthermore, the maximum adsorbed amount was 1229 mg·g–1, exceeding the capabilities of most similar adsorbents. The composites retained a significant adsorption capacity for Cr(VI) even after undergoing five regeneration cycles, demonstrating excellent reusability. Monte Carlo (MC) calculations were executed to search for the most stable configuration and adsorption energies of H4BTC on pC3N4, PANI on H4BTC/pC3N4, and Cr(VI) removal on H4BTC-PANI/pC3N4 surfaces in the aqueous system. The experimental findings indicated that H4BTC-PANI/pC3N4 holds significant promise as a cost-effective material for removing hexavalent chromium from wastewater, showcasing considerable potential for practical use.
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DOI: 10.1021/acsanm.4c01503
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