本文選題：納米銀 + 遷移��； 參考：《化工學(xué)報(bào)》2017年11期

【摘要】：納米銀(AgNP)作為應(yīng)用最廣、生態(tài)毒性最強(qiáng)的工程納米材料之一,一旦進(jìn)入地下水環(huán)境,將引發(fā)環(huán)境問(wèn)題。目前,環(huán)境因素對(duì)納米銀在地下水環(huán)境中運(yùn)移的影響機(jī)理尚不清楚。通過(guò)室內(nèi)柱實(shí)驗(yàn),研究了流速(1、2ml·min~(-1))和介質(zhì)粒徑特征(0.605、0.115 mm以及混合粒徑的玻璃珠)對(duì)納米銀在飽和多孔介質(zhì)中遷移的影響。研究結(jié)果表明納米銀在粒徑較大(0.605 mm)的介質(zhì)中的遷移主要受吸附沉降控制;在小粒徑介質(zhì)中(0.115 mm以及混合粒徑玻璃珠),遷移過(guò)程同時(shí)受吸附沉降和阻塞沉降兩種機(jī)理的控制,且阻塞效應(yīng)主要受小粒徑部分介質(zhì)控制。水流速度提高能降低大粒徑介質(zhì)中納米銀顆粒的沉降效率,從而提高其遷移能力。而對(duì)于小粒徑介質(zhì)和混合粒徑介質(zhì),流速提高除了降低納米銀的沉降效率,還能降低阻塞效應(yīng)和促進(jìn)尺寸排除效應(yīng),不但能更顯著地降低納米銀在介質(zhì)中的衰減,還能提高納米銀在介質(zhì)中的穿透速度。研究成果對(duì)于理解復(fù)雜的場(chǎng)地條件下納米材料的遷移分布動(dòng)態(tài)具有理論價(jià)值。
[Abstract]:As one of the most widely used and ecotoxic engineering nanomaterials, AgNPs will cause environmental problems once they enter the groundwater environment. At present, the effect of environmental factors on the migration of silver nanoparticles in groundwater environment is unclear. The effects of flow rate of 1g / 2ml / min ~ (-1) and medium particle size of 0.605 ~ (0.115 mm) and mixed size glass beads on the migration of silver nanoparticles in saturated porous media were studied by column experiments in the laboratory. The results show that the migration of nano-silver in the medium with larger particle size (0.605 mm) is mainly controlled by the adsorption settlement, while in the medium with small particle size (0.115 mm) and the mixed size of glass beads, the migration process is controlled by the two mechanisms of adsorption settlement and blocking settlement at the same time. The blocking effect is mainly controlled by the medium with small particle size. The increase of flow velocity can reduce the sedimentation efficiency of silver nanoparticles in the medium with large particle size and thus improve its migration ability. For the medium with small particle size and mixed particle size, the increase of flow velocity can not only reduce the sedimentation efficiency of silver nanoparticles, but also reduce the blocking effect and the effect of size exclusion, which can not only significantly reduce the attenuation of silver nanoparticles in the medium. It can also improve the penetration speed of silver nanoparticles in the medium. The results are of theoretical value for understanding the migration and distribution dynamics of nanomaterials under complex site conditions.
【作者單位】： 四川農(nóng)業(yè)大學(xué)環(huán)境學(xué)院;沈陽(yáng)大學(xué)區(qū)域污染環(huán)境生態(tài)修復(fù)教育部重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(41471409,41672248) 沈陽(yáng)市科學(xué)事業(yè)費(fèi)競(jìng)爭(zhēng)性選擇項(xiàng)目 遼寧省創(chuàng)新團(tuán)隊(duì)項(xiàng)目(LT2015017)~~
【分類號(hào)】：X131.2

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本文編號(hào)：1939121