水合氢氧化铁的制备及其去除水中四环素的研究

对水合氢氧化铁(HFO)用于水中四环素的去除进行研究。通过XRD、BET和FTIR对自制的HFO进行表征。探讨不同反应条件对HFO去除四环素的影响。试验结果表明,当初始四环素(TC)溶液pH为6.5,HFO投加量为1g/L,反应18h时,TC的去除率达92.3%,表明HFO能有效去除水中的TC。初始pH为酸性、偏中性的条件下TC的去除效果较碱性条件下好。pH>6.5时发现,随着pH的增大,TC的去除率逐渐减小。同时对HFO去除TC的机理进行了初步探讨。

铅锌尾矿库中黄药对水合氢氧化铁形成的影响

对铅锌尾矿库中的尾矿进行模拟淋溶实验,试验结果表明,当铁离子含量为200 mg/L、黄药含量为100 mg/L的淋滤溶液经过填充有颗粒物的淋溶柱后,浸出溶液中铁的含量分别<0.01 mg/L,黄药的含量<1 mg/L。加入黄药后的酸性含铁废水与尾矿中的具有酸缓冲能力的矿物发生中和反应,pH值升高,形成水合氢氧化铁沉淀,但形成的水合氢氧化铁与未加黄药形成的水合氢氧化铁在形成的位置和形成的形态上有所差异。

Mechanism of Photo-Fenton Degradation of Ethanol and PVA

Contrast degradation experiments between ethanol and polyvinyl alcohol (PVA) were conducted during H2O2, UV/H2O2, Fenton, and Photo-Fenton processes in this study. UV/VIS spectra showed' that complexes between Fe(Ⅲ) and organics were easily formed and degraded within reaction time. Compared with ,the degradation of complex, hydroxyl radicals acted weakly in Fenton or Photo-Fenton process. Hydroxyl radi'cals involved in Photo-Fenton process were deemed to be generated from the split decomposition of H2O2, photolysis of Fe_aq^3+, and degradation of hydrated Fe(Ⅳ)-complex but not traditional Fenton reaction. Experimental evidence to support this point was presented in this paper.