摘要:

選取(qu)6種天(tian)然鐵錳礦石(shi)為(wei)光(guang)(guang)催(cui)(cui)化(hua)(hua)(hua)(hua)劑(ji),以(yi)可(ke)見(jian)光(guang)(guang)(λ＞420nm)照射下(xia)活化(hua)(hua)(hua)(hua)H2O2降(jiang)(jiang)解(jie)有(you)機染料羅丹明B(RhodamineB,RhB)為(wei)探針反(fan)應(ying)(ying),篩選出活性較高的天(tian)然礦石(shi)(磁赤(chi)鐵礦)催(cui)(cui)化(hua)(hua)(hua)(hua)降(jiang)(jiang)解(jie)RhB及2,4-二(er)氯(lv)苯酚(fen)(2,4-Dichlorophenol,DCP).實驗(yan)表(biao)明,可(ke)見(jian)光(guang)(guang)下(xia)磁赤(chi)鐵礦在(zai)(zai)pH=7.0的介(jie)質體(ti)系,H2O2濃度(du)為(wei)3×10-3mol·l-1條件下(xia)可(ke)有(you)效降(jiang)(jiang)解(jie)RhB.通過(guo)反(fan)射紫外光(guang)(guang)譜、原子(zi)吸(xi)收分(fen)光(guang)(guang)光(guang)(guang)度(du)法、XRD初步表(biao)征了(le)磁赤(chi)鐵礦組(zu)成結構;采用紫外-可(ke)見(jian)吸(xi)收光(guang)(guang)譜(UV-vis)、紅(hong)外光(guang)(guang)譜(IR)、總有(you)機碳(TOC)測定(ding)等方法,研(yan)究了(le)其可(ke)見(jian)光(guang)(guang)照射下(xia)對RhB光(guang)(guang)催(cui)(cui)化(hua)(hua)(hua)(hua)降(jiang)(jiang)解(jie)特性.結果表(biao)明,在(zai)(zai)實驗(yan)條件下(xia)RhB礦化(hua)(hua)(hua)(hua)率達60%,DCP礦化(hua)(hua)(hua)(hua)率達到63.93%.利(li)用電子(zi)自旋捕捉(zhuo)技術(ESR)跟蹤測定(ding)RhB降(jiang)(jiang)解(jie)過(guo)程中(zhong)氧化(hua)(hua)(hua)(hua)物種,表(biao)明催(cui)(cui)化(hua)(hua)(hua)(hua)降(jiang)(jiang)解(jie)過(guo)程涉(she)及羥基自由基(·OH)氧化(hua)(hua)(hua)(hua)過(guo)程.擬定(ding)異相礦石(shi)類Fenton體(ti)系與傳統均相Fenton體(ti)系相比(bi),具有(you)反(fan)應(ying)(ying)介(jie)質pH范(fan)圍寬(kuan)(3.0—7.0)、可(ke)見(jian)光(guang)(guang)激發及催(cui)(cui)化(hua)(hua)(hua)(hua)劑(ji)易得廉價等優(you)勢.

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