本文選題：天然有機(jī)質(zhì)　切入點(diǎn)：納米零價(jià)鐵　出處：《化學(xué)學(xué)報(bào)》2017年06期

【摘要】：天然有機(jī)質(zhì)(NOM)對(duì)納米鐵基材料去除污染物過程中的影響作用機(jī)理仍存爭(zhēng)議.本工作選取腐殖酸(HA)作為NOM的代表物,研究了HA對(duì)生物炭負(fù)載納米鎳鐵(BC@Ni/Fe)降解十溴聯(lián)苯醚(BDE209)的動(dòng)力學(xué)影響,結(jié)果表明HA對(duì)BC@Ni/Fe降解BDE209產(chǎn)生抑制作用,且隨著HA濃度的升高,抑制作用越顯著.通過HA與BC@Ni/Fe相互作用實(shí)驗(yàn)發(fā)現(xiàn),HA能夠快速地被BC@Ni/Fe吸附;通過HA對(duì)BC@Ni/Fe的Zeta電位和沉降影響實(shí)驗(yàn)發(fā)現(xiàn),隨著HA濃度的升高可有效提高BC@Ni/Fe的穩(wěn)定性以及表面電荷,這表明HA不是通過影響B(tài)C@Ni/Fe顆粒的性能對(duì)BC@Ni/Fe去除BDE209產(chǎn)生抑制作用的.BC@Ni/Fe的腐蝕能力隨著HA濃度的升高而降低,這與HA對(duì)BC@Ni/Fe去除BDE209反應(yīng)活性影響成正相關(guān)關(guān)系.HA中具有電子傳遞作用的典型醌類化合物2-羥基-1,4-萘醌(Lawsone)和蒽醌-2,6-磺酸鈉(AQDS),在反應(yīng)過程中并沒有起到電子傳遞作用促進(jìn)反應(yīng)進(jìn)行,反而對(duì)BC@Ni/Fe去除BDE209起抑制作用.結(jié)合BDE209和HA之間的競(jìng)爭(zhēng)吸附實(shí)驗(yàn)發(fā)現(xiàn),HA抑制BC@Ni/Fe反應(yīng)活性的主導(dǎo)原因是HA優(yōu)先于BDE209被BC@Ni/Fe吸附,HA包覆于BC@Ni/Fe顆粒表面占據(jù)了活性位點(diǎn),阻礙BC@Ni/Fe與H_2O的接觸,減少了Fe0的腐蝕,從而抑制了BC@Ni/Fe對(duì)BDE209的降解.
[Abstract]:The mechanism of the effect of natural organic matter (NOM) on the removal of pollutants from nanocrystalline iron based materials is still controversial.The effect of HA on the degradation of decabromodiphenyl ether (BDE209) by nano-Ni / Fe supported on biological carbon was studied. The results showed that HA inhibited the degradation of BDE209 by BC@Ni/Fe, and with the increase of HA concentration, the effect of HA on the degradation of BDE209 was studied.The more significant the inhibitory effect was.Through the experiment of the interaction between HA and BC@Ni/Fe, it was found that the HA could be adsorbed by BC@Ni/Fe quickly, and the effect of HA on Zeta potential and sedimentation of BC@Ni/Fe was found to increase the stability and surface charge of BC@Ni/Fe with the increase of HA concentration.This indicates that the corrosion resistance of BC@Ni/Fe to BDE209 removal is decreased with the increase of HA concentration, which is not due to the effect of HA on the performance of BC@Ni/Fe particles.The effect of HA on the activity of BDE209 removal from BC@Ni/Fe was positively correlated. The typical quinone compounds 2-hydroxy-1- (4-naphthoquinone) and anthraquinone (-2O6-sulfonate) in HA did not play an electron transfer role in the process of the reaction to facilitate the reaction, and the effect of HA on the activity of BDE209 removal was positively correlated with the effect of HA on the activity of BDE209 removal.On the contrary, it inhibited the removal of BDE209 by BC@Ni/Fe.In combination with the competitive adsorption experiments between BDE209 and HA, it was found that the main reason for the inhibition of BC@Ni/Fe reaction activity was that HA was preferentially coated by BC@Ni/Fe on the surface of BC@Ni/Fe particles and occupied the active sites, which hindered the contact between BC@Ni/Fe and H _ 2O and reduced the corrosion of Fe0.Thus, the degradation of BDE209 by BC@Ni/Fe was inhibited.
【作者單位】： 華南師范大學(xué)化學(xué)與環(huán)境學(xué)院;廣東省水環(huán)境生態(tài)治理與修復(fù)工程技術(shù)研究中心;廣東高校城市水環(huán)境生態(tài)治理與修復(fù)工程技術(shù)研究中心;
【基金】：NSFC-廣東聯(lián)合基金(No.U1401235)資助~~
【分類號(hào)】：TB34;X592

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