本文關(guān)鍵詞：功能化納米氧化硅在銀離子回收中的應(yīng)用　出處：《昆明理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 納米二氧化硅 表面修飾 銀離子 吸附

【摘要】：銀及含銀產(chǎn)品在電子電鍍、感光材料、化工和科研等領(lǐng)域的廣泛應(yīng)用所產(chǎn)生的大量含銀廢液不僅造成了嚴重的環(huán)境污染,而且使得銀資源大量浪費。因此,回收含銀離子廢液中的銀具有非常重要的研究和實用意義。本論文將不同結(jié)構(gòu)和性能的有機功能分子嫁接到納米二氧化硅表面,制備出了三種對銀離子具有選擇性吸附功能的材料,為從含銀溶液回收銀提供了一種新思路。本論文主要進行了以下三個方面的研究:(1)合成了磺乙基改性的納米二氧化硅�；且一男远趸枘軌蜻x擇性吸附銀離子,最大吸附量為21.9mg/g,吸附平衡時間為60min,最佳吸附pH值為6,吸附過程符合Langmuir等溫吸附模型和準(zhǔn)二級吸附動力學(xué)模型,表明吸附過程主要為單層吸附,速率控制步驟為化學(xué)吸附,吸附劑對銀離子有較好的選擇性,紅外光譜(FT-IR)和X射線光電子能譜(XPS)表明吸附機理為氨基、磺酸基與銀離子產(chǎn)生絡(luò)合作用。(2)羧甲基-二硫代氨基甲酸酯改性二氧化硅對銀離子的吸附研究。羧甲基-二硫代氨基甲酸酯改性納米二氧化硅對銀離子的最佳吸附pH為6,吸附過程大約在120 min達到平衡,最大吸附量為25.8 mg/g,吸附過程符合Langmuir等溫吸附模型和準(zhǔn)二級吸附動力學(xué)模型,表明吸附過程主要為單層吸附,速率控制步驟為化學(xué)吸附,并且吸附劑對銀離子有較好的的選擇性。(3)三聚硫氰酸改性二氧化硅選擇性吸附銀離子的研究。三聚硫氰酸改性二氧化硅能夠選擇性吸附銀離子,最大吸附量為80.0mg/g,吸附平衡時間為30min,最佳吸附pH值為6,吸附過程符合Langmuir吸附等溫線模型和準(zhǔn)二級動力學(xué)模型,吸附劑經(jīng)5次重復(fù)使用后吸附效率無明顯降低。研究表明銀離子的吸附機理主要是銀離子與巰基之間發(fā)生的絡(luò)合作用。
[Abstract]:The extensive application of silver and silver-containing products in the fields of electronic electroplating, photosensitive materials, chemical industry and scientific research has not only caused serious environmental pollution, but also made a large amount of waste of silver resources. The recovery of silver from the waste liquid containing silver ions is of great significance in research and practice. In this paper, organic functional molecules with different structures and properties are grafted onto the surface of nano-silica. Three kinds of materials with selective adsorption of silver ions were prepared. This paper provides a new way to recover silver from silver solution. The nanometer silica modified by sulfonethyl was synthesized. The modified silica can selectively adsorb silver ions. The maximum adsorption capacity is 21.9 mg / g, the adsorption equilibrium time is 60 min, the optimum adsorption pH is 6, and the adsorption process accords with the Langmuir isothermal adsorption model and the quasi-second-order adsorption kinetic model. The results show that the adsorption process is mainly monolayer adsorption, the rate control step is chemical adsorption, and the adsorbent has good selectivity for silver ions. FT-IR) and X-ray photoelectron spectroscopy (XPS) show that the adsorption mechanism is amino. Complexation of sulfonic groups with silver ions. The adsorption of silver ions on silica modified by carboxymethyl-dithiocarbamate was studied. The optimum pH for the adsorption of silver ions on nano-silica modified by carboxymethyl dithiocarbamate was 6. The adsorption process reached equilibrium at about 120 min and the maximum adsorption capacity was 25.8 mg / g. The adsorption process was in accordance with the Langmuir isothermal adsorption model and the quasi-second-order adsorption kinetic model. The results show that the adsorption process is mainly monolayer adsorption and the rate control step is chemical adsorption. And the adsorbent has good selectivity for silver ion.) the silica modified by thiocyanate can selectively adsorb silver ion. The maximum adsorption capacity is 80.0 mg / g, the adsorption equilibrium time is 30 min, the optimum adsorption pH is 6, and the adsorption process accords with the Langmuir adsorption isotherm model and the quasi-second-order kinetic model. The adsorption efficiency of the adsorbent was not significantly decreased after repeated use for 5 times. It was found that the mechanism of silver ion adsorption was mainly the complexation between silver ion and sulfhydryl group.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TF832;TB383.1

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相關(guān)期刊論文 前10條

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本文編號：1425317