Synthesis of Acid Mine Drainage (AMD) Sludge-Derived Al–Fe₃O₄ as Fenton-like Catalysts for the Efficient Degradation of Tetracycline

Abstract

In recent years, the development of environmentally friendly solid catalysts derived from sludge for the efficient removal of pollutants from wastewater has triggered widespread attention. Acid mine drainage (AMD) sludge is a waste produced in the process of acid mine wastewater treatment and contains multitudes of valuable metal resources. Hence it provides the original conditions for the synthesis of metal-based Fenton catalysts. In this article, the Fenton-like catalyst Al−Fe 3 O 4 derived from AMD sludge was first synthesized by acid leaching coprecipitation methods, and the relationship among catalyst properties and pH, growth temperature, and growth time during coprecipitation was explored. Transmission electron microscope (TEM)/vibrating sample magnetometer (VSM)/particulate size description analyzer (DLS) results showed that the Al−Fe 3 O 4 catalyst with high purity, large particle size, and strong magnetic properties was obtained under the conditions of pH 10, reaction temperature 60 °C, and growth for 45 min. In addition, the introduction of Al active sites promoted the activation of H 2 O 2 and improved the catalytic activity of Al− Fe 3 O 4 , and the degradation efficiency of tetracycline was up to 93.9% within 60 min, which was 1.94 times that of pure Fe 3 O 4 . Moreover, Al−Fe 3 O 4 exhibited excellent recyclability after four adsorption−desorption cycles. Hence, this study is expected to promote the resource utilization of industrial sludge and provide a new idea for the rapid removal of TC from aqueous solution.

Enhancing Fenton-like Degradation of Organic Pollutants at Neutral pH by Multivalent Cu NCs/HAp Nanocatalysts

“…On the other hand, most reported metal-based materials such as CuO and Fe 3 O 4 with Fenton-like catalytic performance still face challenges like excessive particle size and uneven distribution, which hinder the exposure of more catalytic active sites. − To tackle these issues, modifying the outer surface of nanocatalysts and homogeneously doping metal into the lattice of inorganic materials are currently popular methods. − For instance, Ren et al improved the dispersibility and specific surface area of Fe 3 O 4 by modifying it with glutathione, which significantly enhanced its catalytic performance under neutral conditions . Similarly, Zahouily et al developed a series of Cu-doped hydroxyapatite (Cu/HAP) and explored their application as a Fenton-like heterogeneous catalyst for the degradation of toxic organic compounds .…”