A simple and fast route for the synthesis of metal-organic framework(MOF) particles was presented.Cu 3(BTC) 2(HKUST-1,BTC=1,3,5-benzenetricarboxylate),one of the most well-known MOFs,was synthesized at room temperature via coordination modulation method.By adding different modulators(monocarboxylic acids) into the reaction system,the morphologies of HKUST-1 crystals were tuned from nano spheres to micro octahedrons at room temperature without any complex equipment.X-Ray diffractions and gas sorption measurements revealed highly crystalline particles with large Brunauer-Emmett-Teller(BET) surface areas(1116―1273 m 2 /g) and total pore volumes(0.62―0.73 cm 3 /g).The significantly small particle sizes and high capacity of gas sorption are considered advantageous for envisaged application in practical industrial process.
The photodegradation of atrazine and the photochemical formation of Fe(Ⅱ)and H_(2)O_(2)in aqueous solutions containing salicylic acid and Fe(Ⅲ)were studied under simulated sunlight irradiation.Atrazine photolysis followed first-order reaction kinetics,and the rate constant(k)corresponding to the solution of Fe(Ⅲ)-salicylic acid complex(Fe(Ⅲ)-SA)was only 0.0153 h^(–1),roughly one eighth of the k observed in the Fe(Ⅲ)alone solution(0.115 h^(–1)).Compared with Fe(Ⅲ)solution,the presence of salicylic acid significantly enhanced the formation of Fe(Ⅱ)but greatly decreased H_(2)O_(2)generation,and their subsequent product,hydroxyl radical(%OH),was much less,accounting for the low rate of atrazine photodegradation in Fe(Ⅲ)-SA solution.The interaction of Fe(Ⅲ)with salicylic acid was analyzed using Fourier-transform infrared(FTIR)spectroscopy and UV-visible absorption,indicating that Fe(Ⅲ)-salicylic acid complex could be formed by ligand exchange between the hydrogen ions in salicylic acid and Fe(Ⅲ)ions.
Xiaoxia OUChong WANGFengjie ZHANGXie QUANYan MAHe LIU
