鋁孟復(fù)合金屬氧化物同步去除水體中砷氟的效能研究
發(fā)布時(shí)間：2019-03-19 16:07
【摘要】：針對(duì)目前地下水體中砷氟復(fù)合污染的問(wèn)題,已經(jīng)被眾多學(xué)者和社會(huì)所廣泛關(guān)注。在眾多砷、氟去除方法中,吸附法以其高效經(jīng)濟(jì)、簡(jiǎn)單易行的特點(diǎn)已經(jīng)成為了人們的研究熱點(diǎn),并且已有研究表明吸附法對(duì)砷和氟都具有良好的去除性能。但是多數(shù)研究都致力于新材料的開發(fā),有關(guān)于同步去除砷氟的研究也比較少,而現(xiàn)有的砷、氟去除技術(shù)具有一定共通性,在此基礎(chǔ)上,尋求一種方法來(lái)同步治理水體中的砷氟本文在課題組前期研究的基礎(chǔ)上制備出鋁錳系列復(fù)合金屬氧化物并研究其同步去除砷氟的效能及其在去除過(guò)程中pH值影響,在此基礎(chǔ)上通過(guò)吸附前后吸附劑的FT-IR圖譜和XPS圖譜來(lái)初步探討吸附機(jī)理。研究結(jié)果表明:(1)與活性氧化鋁相比,鋁錳復(fù)合吸附劑的砷氟共除能力大大增強(qiáng),尤其是對(duì)于As(III),并且在更寬的pH范圍內(nèi)能保持對(duì)砷和氟的高吸附量。(2)在中性條件下同步去除AsF時(shí),鋁錳復(fù)合金屬氧化物對(duì)As(III)、As(V)和F的吸附容量分別為0.833 mmol/g、0.839 mmol/g和5.032 mmol/g。鋁錳復(fù)合金屬氧化物同步去除AsF時(shí),在12h內(nèi)基本可以達(dá)到吸附平衡。吸附劑中錳含量增加有利于提高As(III)的吸附量,加快As(III)的去除速率,鋁含量增加可以促進(jìn)對(duì)As(V)、F的吸附,增加As(V)、F的吸附速率。應(yīng)用中可根據(jù)具體水質(zhì)選擇適宜的鋁錳配比。(3)MODAO對(duì)As(III)的吸附在酸性和堿性條件下效果更好,對(duì)As(V)的吸附量受pH影響不大,對(duì)F的吸附量在偏酸性條件下較高,堿性條件下較低。使用過(guò)程中,可根據(jù)去除對(duì)象不同適當(dāng)調(diào)節(jié)pH(4)As和F都與吸附劑表面羥基基團(tuán)發(fā)生反應(yīng),導(dǎo)致As、F的競(jìng)爭(zhēng)吸附。F的存在可以使As的吸附量明顯下降,而As的存在對(duì)F的吸附卻沒(méi)有太大的影響。As(III)主要被氧化為As(V)后吸附在吸附劑表面,而F吸附前后沒(méi)有發(fā)生形態(tài)變化。鋁錳復(fù)合金屬氧化物對(duì)水體中砷氟具有良好的共除效果,特別是對(duì)As(III)的去除,是一個(gè)新的突破。吸附法去除水體砷氟操作簡(jiǎn)便,簡(jiǎn)單易行,而鋁錳在自然界中來(lái)源廣泛,成本低廉,因此該方法在水體中砷氟共除方面具有廣闊的前景。
[Abstract]:In view of the problem of the compound pollution of the arsenic and fluorine in the underground water, it has been widely concerned by many scholars and the society. In many arsenic and fluorine removal methods, the adsorption method has become a hot spot of people's research, and has shown that the adsorption method has good removal performance for both arsenic and fluorine. However, most studies are committed to the development of new materials, and there are few studies on the simultaneous removal of arsenic and fluorine, and the existing arsenic and fluorine removal technologies have a certain common, on the basis of which, In this paper, an aluminum-manganese series composite metal oxide is prepared on the basis of the previous research of the research group, and the effect of the simultaneous removal of arsenic and fluorine and its influence on the pH value in the removal process are studied in this paper. On this basis, the adsorption mechanism was primarily discussed by the FT-IR and XPS spectra of the adsorbent before and after adsorption. The results show that (1) As compared with activated alumina, the total arsenic and fluorine co-removal capacity of the aluminum-manganese composite adsorbent is greatly enhanced, especially for As (III), and the high adsorption capacity of arsenic and fluorine can be maintained in a wider pH range. (2) The adsorption capacity of Al-Mn composite metal oxide to As (III), As (V) and F was 0.833 mmol/ g, 0.839 mmol/ g and 5.032 mmol/ g, respectively, when the AsF was removed synchronously under neutral conditions. When the Al-Mn composite metal oxide is synchronously removed by AsF, the adsorption equilibrium can be basically achieved within 12 h. The increase of the manganese content in the adsorbent is beneficial to the improvement of the adsorption capacity of As (III), the removal rate of As (III) and the increase of the aluminum content can promote the adsorption of As (V) and F, and the adsorption rate of As (V) and F can be increased. And the suitable aluminum-manganese ratio can be selected according to the specific water quality. (3) The adsorption of As (III) to As (III) is better under acidic and alkaline conditions, and the adsorption capacity of As (V) is not affected by the pH, and the adsorption of As (III) is higher under the bias acid condition and lower in alkaline condition. In that course of use, the reaction of the pH (4) As and F with the hydroxyl group on the surface of the adsorbent can be appropriately adjusted according to the difference of the removal object, leading to the competitive adsorption of As and F. The presence of F can significantly reduce the adsorption amount of As, and the presence of As does not have much influence on the adsorption of F. As (III) is mainly oxidized as As (V), it is adsorbed on the surface of the adsorbent, and no morphological change occurs before and after F adsorption. The Al-Mn composite metal oxide has a good co-removal effect on the arsenic fluorine in the water body, in particular to the removal of As (III), which is a new breakthrough. The method for removing the arsenic in the water body by the adsorption method is simple and easy to operate, and the aluminum-manganese is widely used in the natural world and has low cost, so that the method has a wide prospect in the aspects of arsenic and fluorine in the water body.
【學(xué)位授予單位】：西北農(nóng)林科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：X52
本文編號(hào)：2443676
[Abstract]:In view of the problem of the compound pollution of the arsenic and fluorine in the underground water, it has been widely concerned by many scholars and the society. In many arsenic and fluorine removal methods, the adsorption method has become a hot spot of people's research, and has shown that the adsorption method has good removal performance for both arsenic and fluorine. However, most studies are committed to the development of new materials, and there are few studies on the simultaneous removal of arsenic and fluorine, and the existing arsenic and fluorine removal technologies have a certain common, on the basis of which, In this paper, an aluminum-manganese series composite metal oxide is prepared on the basis of the previous research of the research group, and the effect of the simultaneous removal of arsenic and fluorine and its influence on the pH value in the removal process are studied in this paper. On this basis, the adsorption mechanism was primarily discussed by the FT-IR and XPS spectra of the adsorbent before and after adsorption. The results show that (1) As compared with activated alumina, the total arsenic and fluorine co-removal capacity of the aluminum-manganese composite adsorbent is greatly enhanced, especially for As (III), and the high adsorption capacity of arsenic and fluorine can be maintained in a wider pH range. (2) The adsorption capacity of Al-Mn composite metal oxide to As (III), As (V) and F was 0.833 mmol/ g, 0.839 mmol/ g and 5.032 mmol/ g, respectively, when the AsF was removed synchronously under neutral conditions. When the Al-Mn composite metal oxide is synchronously removed by AsF, the adsorption equilibrium can be basically achieved within 12 h. The increase of the manganese content in the adsorbent is beneficial to the improvement of the adsorption capacity of As (III), the removal rate of As (III) and the increase of the aluminum content can promote the adsorption of As (V) and F, and the adsorption rate of As (V) and F can be increased. And the suitable aluminum-manganese ratio can be selected according to the specific water quality. (3) The adsorption of As (III) to As (III) is better under acidic and alkaline conditions, and the adsorption capacity of As (V) is not affected by the pH, and the adsorption of As (III) is higher under the bias acid condition and lower in alkaline condition. In that course of use, the reaction of the pH (4) As and F with the hydroxyl group on the surface of the adsorbent can be appropriately adjusted according to the difference of the removal object, leading to the competitive adsorption of As and F. The presence of F can significantly reduce the adsorption amount of As, and the presence of As does not have much influence on the adsorption of F. As (III) is mainly oxidized as As (V), it is adsorbed on the surface of the adsorbent, and no morphological change occurs before and after F adsorption. The Al-Mn composite metal oxide has a good co-removal effect on the arsenic fluorine in the water body, in particular to the removal of As (III), which is a new breakthrough. The method for removing the arsenic in the water body by the adsorption method is simple and easy to operate, and the aluminum-manganese is widely used in the natural world and has low cost, so that the method has a wide prospect in the aspects of arsenic and fluorine in the water body.
【學(xué)位授予單位】：西北農(nóng)林科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：X52
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