Divinylbenzene

Standard Formic acid (FA), mefenamic acid (MA), chloroamphenicol (CP), ketoprofen (KEP), clofibric acid (CA), indometacin (IDM), acetylsalicylic acid (ASP), bisphenol A (BPA), 2-phenylphenol, gemfibrozil (GEM), triclosan (TCS), and ibuprofen (IBU) (>98% of purity for all the chemicals) were purchased from J&K Scientific (Shanghai, China). Methanol (Tedia, USA) and acetonitrile (ACN) (Tedia, USA) were HPLC-grade. Divinylbenzene (DVB, 80%), benzoyl peroxide (BPO, 98%), toluene (TOL, 99.5%), oleic acid (OA), and 1,2-dichloroethane (DCE, 99%) were provided by Sinopharm Chemical Reagent Co., Ltd. (China). Ferric chloride hexahydrate (FeCl₃ • 6H₂O), ferrous chloride tetrahydrate (FeCl₂ • 4H₂O), anhydrous ferric chloride (FeCl₃), N,N-dimethyl-1,3-propanediamine, ammonium hydroxide, and other inorganic salts (analytical grade) were purchased from Nanjing Chemical Reagent Co., Ltd. (Nanjing, China). Ultrapure water prepared by the Milli-Q water purification system (Billerica, MA, USA) was used for all experiments.

λ-Cyhalothrin (LC), fenvalerate (FL) were supplied by Jiangsu Huangma Agrochemicals Co., Ltd. Fe₃O₄ nanoparticles (mean diameter is 250 nm), styrene (St), divinylbenzene (DVB), acrylamide (AM), oleic acid (OA), methacrylic acid (MAA), α,α′-azoisobutyronitrile (AIBN), toluene, methanol, acetone, chloroform, diethyl phthalate (DEP), and calcium chloride dihydrate (CaCl₂·2H₂O) were purchased from Sinopharm Chemical Reagent Co., Ltd (Shanghai, China). Hypermer 2,296 was purchased from CRODA UK. All chemicals were of analytical reagent grade. Water was freshly deionized and distilled.