本文選題：納米顆粒 + nMgO��； 參考：《中國(guó)環(huán)境科學(xué)》2017年07期

【摘要】：比較4種金屬氧化物納米顆粒(nMgO,nAl_2O_3,nTiO2和nFe_2O_3)對(duì)水體P的吸附性能,并探討了pH、吸附時(shí)間、共存離子等因素對(duì)nMgO吸附P的影響,用XRD和XPS分析了nMgO對(duì)P的吸附機(jī)制,最后通過小青菜盆栽實(shí)驗(yàn)法探討nMgO從養(yǎng)殖廢水中吸附回收P的應(yīng)用潛力.結(jié)果發(fā)現(xiàn),在pH3.0~8.0范圍內(nèi),nMgO對(duì)P的吸附量顯著高于nAl_2O_3、nTiO_2和nFe_2O_3,4種納米顆粒對(duì)P的吸附量分別可達(dá)40、31.77、15.93和13.08mg/g.吸附后P的解吸可逆性較差.nMgO對(duì)P的吸附能在0.5h內(nèi)達(dá)到吸附平衡,P的吸附符合準(zhǔn)二級(jí)動(dòng)力學(xué)過程.體系共存的等量F~-、Cl~-、NO_3~-、SO_4~(2-)、Na~+、K~+和NH_4~+離子對(duì)nMgO吸附P無(wú)顯著影響,Mg~(2+)和Ca~(2+)離子對(duì)P吸附具有促進(jìn)作用.nMgO對(duì)P的吸附等溫線可用Langmuir模型描述,最大吸附量達(dá)139.3mg/g.XRD和XPS分析表明,nMgO對(duì)P的吸附是伴有靜電吸引的以表面絡(luò)合沉淀反應(yīng)為主的吸附過程.nMgO能有效地從養(yǎng)殖廢水中吸附回收P,吸附P的nMgO作為肥料,能使小青菜干物質(zhì)量從0.31g/kg土增加到0.96g/kg土.
[Abstract]:The adsorption properties of four kinds of metal oxide nanoparticles (nMgONAl _ 2O _ 3nTiO _ 2 and nFe _ 2O _ 3) on P in water were compared. The effects of pH, adsorption time and coexisting ions on the adsorption of P by nMgO were discussed. The mechanism of P adsorption by nMgO was analyzed by XRD and XPS. Finally, the application potential of nMgO in recovering P from culture wastewater was discussed by pot experiment. The results show that the amount of P adsorbed by nMgO in the range of pH3.0~8.0 is significantly higher than that of nAl2O3nTiO2 and nFe2O3s in the range of pH3.0~8.0. The desorption reversibility of P after adsorption is poor. The adsorption energy of P can reach the adsorption equilibrium within 0.5 h. The adsorption of P conforms to the quasi-second-order kinetic process. The isotherm of P adsorbed by nMgO can be described by Langmuir model. The isotherm of P adsorbed by Ca~(2 ions can be described by Langmuir model, and the isotherms of P adsorption by Ca~(2) ions have no significant effect on the adsorption of nMgO by K ~ and NH ~ (4 ~ +) ions, and the isotherm of P adsorption can be described by Langmuir model, and the isotherm of P adsorption can be described by Langmuir model. The results of 139.3mg/g.XRD and XPS analysis showed that the adsorption of P by nMgO was an adsorption process with electrostatic attraction, which was mainly composed of surface complexation precipitation reaction. NMgO could effectively adsorb and recover P from aquaculture wastewater and adsorb nMgO of P as fertilizer. It can increase the dry weight of green vegetables from 0.31g/kg soil to 0.96g/kg soil.
【作者單位】： 西北農(nóng)林科技大學(xué)資源環(huán)境學(xué)院;西北農(nóng)林科技大學(xué)理學(xué)院;School
【基金】：中央高�；究蒲袠I(yè)務(wù)費(fèi)項(xiàng)目(2014YB064) 美國(guó)農(nóng)業(yè)部環(huán)保署項(xiàng)目(USDA-NRCS#69-3A75-10-156)
【分類號(hào)】：X52;X713

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