Coal Fly Ash Decorated with Graphene Oxide–Tungsten Oxide Nanocomposite for Rapid Removal of Pb²⁺ Ions and Reuse of Spent Adsorbent for Photocatalytic Degradation of Acetaminophen

Abstract

Coal fly ash was decorated with a graphene oxide–tungsten oxide nanorods nanocomposite (CFA/GO/WO 3 NRs nanocomposite) via a hydrothermal method and applied for the remediation of lead (Pb 2+ ions). The Pb 2+ ion-loaded spent adsorbent (CFA/GO/WO 3 NRs + Pb 2+ nanocomposite) was reused for the photodegradation of acetaminophen. CFA/GO/WO 3 NRs + Pb 2+ nanocomposite displayed rapid removal of Pb 2+ ions. Pseudo-second-order kinetics and the Langmuir isotherm model described the adsorption data. The adsorption capacity of the CFA/GO/WO 3 NRs nanocomposite was 41.51 mg/g for the removal of Pb 2+ ions. Additionally, the Pb 2+ ion-loaded spent adsorbent significantly influenced the degradation of acetaminophen by photocatalysis where 93% degradation was observed. It is worthy to note the reuse application of Pb 2+ ion-loaded spent adsorbent as a photocatalyst, which will significantly reduce the secondary waste obtained from conventional adsorption methods.

Removal of Pb2+ from Wastewater By γ‐Fe2O3@SHFA Based on Alkali‐Modified Fly Ash: Performance and Mechanism

“…The CFA‐based graphene oxide (GO)–tungsten oxide (WO 3 ) nanorods’ (NRs) nanocomposite was prepared by the hydrothermal method, and at ambient temperature, the maximum Pb 2+ removal capacity of CFA/GO/WO 3 NRs was 41.51 mg g −1 . [ 37 ] The synthesized γ‐Fe 2 O 3 nanocrystals were directly used to remove Pb 2+ in aqueous solution, and the maximum removal capacity was 25.0 mg g −1 . [ 38 ] In this study, the magnetic coagulant (γ‐Fe 2 O 3 @SHFA) synthesized by γ‐Fe 2 O 3 and modified FA has better Pb 2+ removal performance, and the maximum removal capacity was significantly improved.…”

Novel Chemoresistive Sensor for Sensitive Detection of Pb2+ Ions Using an Interdigital Gold Electrode Fabricated with a Reduced Graphene Oxide-Based Ion-Imprinted Polymer

“…The performance characteristic of the IIP–rGO-based sensor possesses remarkable advantages such as high selectivity, low cost, and high sensitivity toward the detection of Pb 2+ ions and is comparable with the related studies . Remediation studies integrated into the chemical sensing of metal ions for fabricating chemically modified nanomaterials that are economical, effective, and efficient for metal ions adsorption in the environmental water are growing exponentially. − …”

One-Step Synthesis of a Mn-Doped Fe2O3/GO Core–Shell Nanocomposite and Its Application for the Adsorption of Levofloxacin in Aqueous Solution

“…The MnFe 2 O 3 /GO core–shell nanocomposite was also prepared by the one-step hydrothermal method. 33 In a representative experiment, 1 g of synthesized GO was dissolved in 500 mL of deionized H 2 O with ultrasonication for 30 min. FeCl 3 (2.0 g) was dissolved in 20 mL of deionized H 2 O and then transferred into the solution while stirring, followed by the addition of 100 mg of Mn(NO) 3 .…”

“…The MnFe 2 O 3 /GO core–shell nanocomposite was also prepared by the one-step hydrothermal method . In a representative experiment, 1 g of synthesized GO was dissolved in 500 mL of deionized H 2 O with ultrasonication for 30 min.…”