In this research, magnetite and ethylenediamine-N,N'-disuccinic acid (EDDS) are used in a heterogeneous photo-Fenton system in order to find a new way to remove organic contaminants from water. Influence of different parameters including magnetite dosage, EDDS concentration, HO concentration, and pH value were evaluated. The effect of different radical species including HO and HO/O was investigated by addition of different scavengers into the system. The addition of EDDS improved the heterogeneous photo-Fenton degradation of bisphenol A (BPA) through the formation of photochemically efficient Fe-EDDS complex. This effect is dependent on the HO and EDDS concentrations and pH value. The high performance observed at pH 6.2 could be explained by the ability of O to generate Fe(II) from Fe(III) species reduction. GC-MS analysis suggested that the cleavage of the two benzene rings is the first degradation step followed by oxidation leading to the formation of the benzene derivatives. Then, the benzene ring was opened due to the attack of HO radicals producing short-chain organic compounds of low molecular weight like glycerol and ethylene glycol. These findings regarding the capability of EDDS/magnetite system to promote heterogeneous photo-Fenton oxidation have important practical implications for water treatment technologies.

An adhesive LaCrO 3 perovskite coating has been prepared on stainless steel substrate by cathodic electrodeposition from aqueous solution 0.03 M La(CH 3 COO) 3 + 0.03 M CrCl 3 + 0.03 M Na 3 C 6 H 5 O 7 , followed by heat-treatment at 800 • C in air. The electrodeposition of La-Cr coatings has been examined in the solution with pH of 2∼3 at the current density of 1∼5 mA cm −2 . It is shown that the change of pH by even 0.1 can affect obviously the deposition of La-Cr coatings, and increasing the current density will lead to the generation of more cracks in the coatings. A more uniform and compact La-Cr coating can be obtained in the solution with the optimized pH value of 2.7 at the optimized current density of 1 mA cm −2 . The La and Cr deposits change from their metallic states to the hydroxides during electrodeposition, corresponding to the increase in the pH with time. The as-prepared La-Cr coating is rich in La, due to the strong coordination of trivalent chromium with complex agent in the bath. The outward diffusion of Cr from the stainless steel substrate supplies the as-prepared La-rich coating to form LaCrO 3 during heat-treatment. which are capital intensive and difficult for scale production. Electrodeposition of Ln-M coatings from aqueous solutions followed by heat-treatment is an advantageous method for preparing perovskite coatings. [11][12][13][14][15] This method offers a more economical and efficient technique for the fabrication of perovskite coatings. Nevertheless, although the Ln-M coatings have been successful prepared using both anodic and cathodic electrodeposition methods, relevant research is still limited and challenging.Matsumoto et al [11][12][13] conducted a series of research on the anodic electrodeposition of Ln-M (M = Co, Mn) coatings. Their studies indicated that Ln ions did not participate in any oxidation reactions. The incorporation of Ln ions into the M hydroxide/oxide coatings was achieved by enriching the bath with Ln ions and their consequent adsorption. This gives poor control over the Ln contents in the coatings and requires a high concentration of Ln ions for deposition. 15By comparison, cathodic electrodeposition is an inherently superior technique as both Ln and M ions participate in the reactions, leading to facile deposition of Ln and M elements. 14 However, the cathodic electrodeposition of Ln-M coatings still faces some problems. The main obstacle stems from the low equilibrium potentials of Ln ions. Since the equilibrium potentials of Ln ions (Ln 3+ + 3e -→Ln; E 0 = -2.52 ∼-2.25 V SHE ) are much more negative than that of water (2H 2 O + 4e -→2OH -+ H 2 ; E 0 = -0.828 V SHE ), electrolytic decomposition of water appears preferentially.16,17 Fortunately, electrodeposition of Ln elements can be achieved by adding some complex agents to shift their evolution potentials to more positive values. 18,19 Lokhande et al 20 investigated the electrodeposition of La from aqueous solutions on different substrates and found that sodium citrate was a suitable complex agent for L...

An electrochemically enabled C(sp3)-C(sp) cross-coupling reaction is herein described for the synthesis of internal alkynes. This method is suitable not only to a diverse of acetylenic sulfones, but also to...

The application of carboxylic acid and natural iron oxide in heterogeneous AOP systems for the treatment of organic pollutants in water has attracted extensive attention.

No abstract