Correction: Kong et al. Preparation of Poly Aluminum-Ferric Chloride (PAFC) Coagulant by Extracting Aluminum and Iron Ions from High Iron Content Coal Gangue. Materials 2022, 15, 2253

Missing Citation

The authors wish to make the following correction to the published paper [1], the citation mark [13] for “Figure 3. SEM image of the gangue” was lost. The correct Figure 3 caption should be “Figure 3. SEM image of the gangue [13]”.

The authors apologize for any inconvenience caused and state that the scientific conclusions are unaffected. This correction was approved by the Academic Editor. The original publication has also been updated.