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Weak magnetic field (WMF) and Fe⁰ were proposed to activate PS synergistically (WMF-Fe⁰/PS) to degrade dyes and aromatic contaminants. The removal rates of orange G (OG) by WMF-Fe⁰/PS generally decreased with increasing initial pH (3.0–10.0) and increased with increasing Fe⁰ (0.5–3.0 mM) or PS dosages (0.5–3.0 mM). Compared to its counterpart without WMF, the WMF-Fe⁰/PS process could induce a 5.4–28.2 fold enhancement in the removal rate of OG under different conditions. Moreover, the application of WMF significantly enhanced the decolorization rate and the mineralization of OG. The degradation rates of caffeine, 4-nitrophenol, benzotriazole and diuron by Fe⁰/PS were improved by 2.1–11.1 fold due to the superimposed WMF. Compared to many other sulfate radical-based advanced oxidation technologies under similar reaction conditions, WMF-Fe⁰/PS technology could degrade selected …