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用多功能的多壁碳納米管吸收汞
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Enhanced sorption of mercury from compact fluorescent bulbs and contaminated water streams using functionalized multiwalled carbon nanotubes.Journal of Hazardous Materials 274 (2014) 132–144. 影響因子:4.331 摘要:Three different functionalized multiwalled carbon nanotubes were prepared, namely, oxidized CNTs (CNT OX), iodide incorporated MWCNT (CNT I) and sulfur incorporated MWCNT (CNT S). The as prepared adsorbents were structurally characterized by various spectral techniques like scanning electron microscopy (SEM), energy dispersive X ray (EDAX), Brunauer, Emmett, and Teller (BET) surface area analyzer, Fourier transform infra red (FTIR) and Raman spectroscopy. Loading of iodide and sulfur was evident from the EDAX graphs. The adsorption properties of Hg2+ as a function of pH, contact time and initial metal concentration were characterized by Cold vapor AAS. The adsorption kinetics fitted the Pseudo second order kinetics and equilibrium was reached within 90 min. The experimental data were modeled with Langmuir, Freundlich, Dubinin-Redushkevich and Temkin isotherms and various isotherm parameters were valuated. It was found that the mercury adsorption capacity for the prepared adsorbents were in the order of CNT S > CNT I > CNT OX > CNT. Studies have been conducted to demonstrate the applicability of the sorbent toward the removal of Hg(0) from broken compact fluorescent light (CFL) bulbs and Hg(II) from contaminated water streams. 中文翻譯摘要:制備了三種不同的多功能的多壁碳納米管,即,氧化的CNTs(CNT OX),含碘的MWCNT(CNT I)和含硫的MWCNT(CNT S)。預(yù)制備的吸附劑通過(guò)各種各樣的吸附質(zhì)在結(jié)構(gòu)上進(jìn)行表征,例如掃描電子顯微鏡(SEM),能量色散X射線(EDAX),BET表面積分析,傅里葉變換紅外光譜(FTIR)和拉曼光譜學(xué)。碘化物和硫的加入由EDAX圖表證實(shí)。Hg2+的吸收性能與pH、接觸時(shí)間和最初金屬濃度的關(guān)系由冷蒸汽原子吸收光譜法表征。吸附動(dòng)力學(xué)與準(zhǔn)二級(jí)動(dòng)力學(xué)方程相吻合,在90min內(nèi)達(dá)到平衡。實(shí)驗(yàn)數(shù)據(jù)用朗繆爾、弗羅因德利克、杜比寧和特姆金等溫線建模,估算了多種等溫線參數(shù)。發(fā)現(xiàn)制備的吸附劑的銀吸附能力順序是CNT S>CNT I>CNT OX>CNT。研究的目的在于將吸附劑應(yīng)用于去除破碎的燈泡和污染廢水中的汞。 想獲得更多資源可點(diǎn)擊鏈接http://www.tjdrfk.com/news/hjuyf.html 圖片8.jpg 圖片5.jpg 圖片6.jpg 圖片7.jpg |

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