Abstract
Recyclable nanomaterials are in great need to develop clean technology for applications in the removal of water contaminants. In this work, easily separable montmorillonite/Fe3O4/humic acid (MFH) nanocomposites were fabricated through a facile hydrothermal route. It was found the adsorption ability and stability of MFH was significantly enhanced due to the synergistic effects between montmorillonite, Fe3O4 nanoparticles and humic acid. The MFH nanocomposites are highly efficient and recyclable as they can remove at least 82.3% of Cr(VI) and 95.1% of aniline in six consecutive runs. The adsorption mechanism was investigated by analyzing the kinetic parameters of pseudo first-order, pseudo second-order, and intraparticle diffusion models and describing the equilibrium isotherms of Langmuir and Freundlich models. Results indicated different adsorption mechanisms of Cr(VI) and aniline by MFH. The readily synthesized MFH nanocomposites can act as effective and practical materials for environmental applications.
Highlights
As one of the most toxic heavy metals and common contaminants in wastewater, Cr can be found in wastewater from painting, tanning, and metallurgical industries [1,2]
Aniline is a group of emerging contaminants in wastewater from many industrial processes, such as painting, pharmacy, and rubber [4]
Heavy metals like Cr(VI) and aniline can coexist in industrial wastewater [6]
Summary
As one of the most toxic heavy metals and common contaminants in wastewater, Cr can be found in wastewater from painting, tanning, and metallurgical industries [1,2]. It generally exists in the form of Cr(III) or Cr(VI) with the latter hundreds of times more toxic than the former. Aniline can greatly harm human and aquatic life as it is highly toxic and it can accumulate in the environment [5]. It can enter the body through inhalation, digestion and skin absorption, convert hemoglobin to methemoglobin and result in cyanosis [4]. It is significant to achieve simultaneous removal of Cr(VI) and aniline from industrial wastewater to prevent their damage to the ecosystem and human health
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