Diphenhydramine hydrochloride

The natural dolomite sample used in this work was obtained from Jinyuan Co., Ltd (Zhengzhou, China). Methylene blue (MB), diphenhydramine hydrochloride (DP), and tetracycline hydrochloride (TC) with purity >98% were purchased from Sinopharm Chemical Reagent Co., Ltd (Beijing, China). Chemical reagents including acetonitrile, acetic acid, methanol, and triethylamine were high-performance liquid chromatography (HPLC) grade, and purchased from J&K Chemical Co., Ltd (Beijing, China). The spin-trapping reagents 2,2,6,6-tetramethylpiperidine (TEMP) and 5,5-dimethyl-1-pyrroline N-oxide (DMPO) used for electron paramagnetic resonance (EPR) experiments were supplied by Tokyo Chemical Industry Co., Ltd (Tokyo, Japan). Milli-Q water (18 MΩ cm⁻¹) was used to prepare all solutions.

The dolomite used in this study was supplied by XBKC Co., Ltd (Shiyan, China). The diphenhydramine hydrochloride with a purity > 98%, superoxide dismutase (SOD), and TiO₂ were provided by Sinopharm Chemical Reagent Co., Ltd (Shanghai, China). Acetonitrile, acetic acid, triethylamine, 1, 4-diazabicyclo [2.2.2] octane (DABCO), and isopropanol (IPA) were of high-performance liquid chromatography (HPLC) grade, and supplied by J&K Chemical Co., Ltd (Beijing, China). The spin-trapping reagents 5,5-dimethyl-1-pyrroline N-oxide (DMPO) and 2,2,6,6-tetramethylpiperidine (TEMP) were purchased from Sigma-Aldrich (Shanghai, China). All aqueous solutions were prepared with Milli-Q ultrapure water.