本文關(guān)鍵詞： 碳納米管 石墨烯 MnO_2 改性 吸附 鎘離子　出處：《寧夏大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：目前重金屬鎘離子(Cd2+)的水污染問題受到人們極大的關(guān)注。碳納米材料,尤其是碳納米管及石墨烯,具有比表面積大,吸附能力強(qiáng)等特點(diǎn),在高效水處理領(lǐng)域已經(jīng)展現(xiàn)出良好的發(fā)展?jié)摿Α１菊撐膶㈩A(yù)先處理過的CNTs或GO分散在水中,通過錳鹽之間的氧化還原反應(yīng),直接一鍋法制備出MnO2/CNTs和MnO2/GO兩種吸附材料,對兩種材料進(jìn)行FTIR、SEM、XRD、BET等表征,并將其用于含鎘廢水處理,系統(tǒng)研究了各影響因素對吸附效果的影響規(guī)律,優(yōu)化了吸附分離條件,最后淺析了復(fù)合化功效機(jī)制。通過對水中Cd2+的吸附試驗(yàn),系統(tǒng)研究了不同因素等對吸附效果的影響。結(jié)果表明,對于MnO2/CNTs而言:當(dāng)負(fù)載量為30%、含鎘水的pH為6-8、吸附時(shí)間120 min、吸附劑用量為20 mg、樣品流速為2.0 mL/min、樣晶體積為5 mL時(shí)改性的負(fù)載Mn02碳納米管對Cd2+的吸附量最優(yōu),去除量最高;對于MnO2/GO而言:當(dāng)負(fù)載量為15%、pH為5-11、吸附時(shí)間30 min、吸附劑用量為10 mg、樣品流速為2.0 mL/min、樣晶體積為5 mL時(shí)MnO2/GO對Cd2+的吸附量最優(yōu),去除量最高。實(shí)驗(yàn)結(jié)果還表明它們的吸附量不受溶液中共存離子的影響。平衡吸附等溫、吸附動力學(xué)和熱力學(xué)數(shù)據(jù)分析數(shù)據(jù)表明:MnO2/CNT和MnO2/GO對Cd2+的吸附比較符合朗繆爾模型,吸附過程為自發(fā)、吸熱、熵增過程,它們的吸附動力學(xué)過程比較符合擬二級動力學(xué)模型。最后,綜合對比MnO2/CNTs、MnO2/GO對實(shí)際含鎘廢水綜合處理效果,結(jié)果表明:MnO2/CNTs和MnO2/GO對溶液中Cd2+均具有較強(qiáng)的吸附能力,其中,MnO2/GO吸附材料綜合處理能力更強(qiáng),更加高效。兩種材料在含鎘廢水處理方面均具有廣闊的應(yīng)用潛力。
[Abstract]:At present, the water pollution of heavy metal CD ~ (2 +) has attracted great attention. Carbon nanomaterials, especially carbon nanotubes and graphene, have large specific surface area and strong adsorption capacity. In this paper, pretreated CNTs or go were dispersed in water, and two kinds of adsorption materials, MnO2/CNTs and MnO2/GO, were prepared by direct one-pot method through redox reaction between manganese salts. Two kinds of materials were characterized by FTIR SEMX XRDX BET and used in the treatment of cadmium containing wastewater. The influence of various factors on the adsorption effect was studied systematically, and the adsorption and separation conditions were optimized. Finally, the mechanism of compound effect is analyzed. The effects of different factors on the adsorption efficiency of Cd2 in water are systematically studied. The results show that, For MnO2/CNTs, when the loading amount is 30%, the pH of cadmium water is 6-8, the adsorption time is 120 min, the amount of adsorbent is 20 mg, the flow rate of sample is 2.0 mL / min, and the volume of sample crystal is 5 mL, the adsorbed amount of Cd2 is the best and the removal amount is the highest. For MnO2/GO, the optimal adsorption capacity of MnO2/GO for Cd2 was obtained when the loading amount was 15: 15, the adsorption time was 30 min, the amount of adsorbent was 10 mg, the flow rate of sample was 2.0 mL / min, the sample volume was 5 mL, and the adsorption time was 30 min, the adsorption time was 30 min, the flow rate was 2.0 mL / min, and the volume of sample crystal was 5 mL. The experimental results also show that their adsorption capacity is not affected by coexisting ions in solution. The equilibrium adsorption isotherm, adsorption kinetics and thermodynamic data show that the adsorption of Cd2 by MnO2/GO and MNO _ 2 / CNT accords with Langmuir model. The adsorption process is spontaneous, endothermic and entropy increasing, and their adsorption kinetic processes are in accordance with the pseudo-second-order kinetic model. Finally, the comprehensive treatment effects of MnO2 / CNTsNMnO2 / go on actual wastewater containing cadmium are compared. The results show that both MnO2/GO and% MNO _ 2 / CNTs have strong adsorption capacity for Cd2 in solution, and the adsorption materials of MNO _ 2 / go are more efficient and more efficient. Both of them have wide application potential in the treatment of cadmium wastewater.
【學(xué)位授予單位】：寧夏大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TB383.1;O647.3;X703

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本文編號：1547771