Abstract

The interaction process between phosphorus and arsenic is of great significance for controlling arsenic pollution by iron oxide minerals. In this work, the α−FeOOH@hydrothermal carbonisation (HTC) composites with abundant oxygen vacancy were synthesized by a hydrothermal method using HTC as a carrier and were used for the removal of arsenic in different phosphate environments. The surface hydroxyls (OHs) in α−FeOOH promote the production of OVs on the surface of the composite and improve the adsorption capacity of As(III). The experiment results showed that the maximum adsorption capacity of α−FeOOH@HTC on As(III) under the influence of PO43−, HPO42−, and H2PO4− were 8.76 mg∙g−1, 10.67 mg∙g−1 and 10.21 mg∙g−1, respectively. Infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS) analysis showed that after adsorption, a characteristic peak of As(III) was generated on the FeOOH@HTC surface. The possible adsorption mechanism for As (III) by α−FeOOH@HTC is the surface complexation and precipitation of M−OH as well as Fe−OH−Fe with As (III). After the application of composite materials in rice seedling hydroponic experiments, it was found that they have a certain degree of biological safety, providing a theoretical basis for reducing arsenic pollution. This work studies the adsorption behavior of OVs on As(III) and provides a new approach to address arsenic contamination in water.

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