Recent Progress of Layered Double Hydroxide-Based Materials in Wastewater Treatment

Layered double hydroxides (LDHs) can be used as catalysts and adsorbents due to their high stability, safety, and reusability. The preparation of modified LDHs mainly includes coprecipitation, hydrothermal, ion exchange, calcination recovery, and sol-gel methods. LDH-based materials have high anion exchange capacity, good thermal stability, and a large specific surface area, which can effectively adsorb and remove heavy metal ions, inorganic anions, organic pollutants, and oil pollutants from wastewater. Additionally, they are heterogeneous catalysts and have excellent catalytic effect in the Fenton system, persulfate-based advanced oxidation processes, and electrocatalytic system. This review ends with a discussion of the challenges and future trends of the application of LDHs in wastewater treatment.

Automated summary

Layered double hydroxides (LDHs) are used as catalysts and adsorbents due to their stability, safety, and reusability. They have high anion exchange capacity, thermal stability, and a large specific surface area, enabling effective removal of heavy metal ions, inorganic anions, organic pollutants, and oil pollutants from wastewater. LDHs also serve as heterogeneous catalysts in various advanced oxidation processes, including the Fenton system and electrocatalytic system. Challenges and future trends of LDHs in wastewater treatment are discussed in this review.