Novel covalently bound organic silicon-ferrum hybrid coagulant with excellent coagulation performance and bacteriostatic ability

The complex composition of water bodies often complicates the water treatment process. Coagulation is an important part of water treatment, subsequent water treatment can be simplified by maximally removing sus-pended particles, natural organic matter, and pathogenic microorganisms during coagulation. Here, we devel-oped a novel silicon-ferrum hybrid coagulant (SFHC). The morphology and structure were described by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), elemental analysis (EA) and X-ray diffraction (XRD). The Fe-ferron reaction kinetics were used to evaluate the morphological distribution of Fe species in SFHC. It was finally determined that the SFHC with Si/Fe of 0.1 and B value of 1.0 showed the best coagulation efficiency. At the optimum dose, SFHC achieved 95.83% removal of 20 mg L-1 humic acid wastewater, and turbidity was almost completely removed in kaolin waste-water. SFHC maintained high coagulation efficiency over a wide range of pH values (pH 5-9), which was su-perior to conventional coagulants. Furthermore, SFHC has excellent coagulation performance to the soluble small-molecular pollutants as nitrate (NO3-), phosphate (PO43-) and diclofenac (DCF) in water, and has good bacteriostatic ability to pathogenic microorganisms (96.94% bacteriostatic rate at 40 x 10-5 mol L-1 dosage). Regarding actual water bodies, SFHC also showed excellent performance. Therefore, SFHC has great potential as a multifunctional and effective coagulant.