納米零價(jià)鐵處理水中含氯有機(jī)物和鉛的研究
[Abstract]:With the rapid development of social production, the groundwater resources have been polluted by various factors such as urban waste, industrial three wastes, agricultural production, mining and smelting. China is a country with severe drought and water shortage, with the groundwater accounting for about 31% of the total water resources in China, so how to do well the groundwater resource pollution control work has been widely concerned by the society. Since the late 1990s, the potential of nano-zero-valent iron as a result of its reduction of underground pollutants, such as polychlorinated biphenyls, chlorinated solvents and heavy metals, has been studied for groundwater remediation. The nano-zero-valent iron has a great prospect in the environment due to its high activity, and has carried out a large number of laboratory and field studies to evaluate its effectiveness. However, the nano-zero-valent iron is easy to spontaneous combustion in the air, and the oxidation is easy to occur even when the nano zero-valent iron is in slow contact with the air, so that the oxide or the hydroxide is generated on the surface to reduce the reaction activity, and the problems all influence the application of the nano zero-valent iron in the practical application. In view of the above problems, the present study is based on environmentally friendly kaolin (Kaolin), bentonite (Bentonite), zeolite (Zeolite), sodium methylcellulose (CMC), The nano-zero-valent iron was synthesized with agar (Agar) and starch (Starch) as the wrapping agent, and the nano-zero-valent iron was synthesized by the green synthesis of the extract of the leaves of the leaves of the leaves of the purple leaf, and the nano-zero-valent iron was prepared by the X-ray powder diffractometer (XRD), the scanning electron microscope (SEM) and the transmission electron microscope (TEM). The obtained samples were characterized by Fourier transform infrared (FTIR) and the like. The reduction and removal ability of the Pb ~ (2 +)-TCM for trichloromethane (TCM), carbon tetrachloride (carbon tetrachloride (CTC) and mixed wastewater Pb ~ (2 +)-TCM was investigated. The main conclusions are as follows:1. The mineral-coated nano-zero-valent iron was prepared by using the environment-friendly Kaolin, Bennite and Zeolite as surface-modified materials. The experimental results of the removal of chloroform (TCM) from the mineral-coated nano-zero-valent iron show that the main factors that affect the removal effect of the TCM include the amount of the mineral-coated nano-zero-valent iron, the initial concentration of the TCM and the p-H value. The initial concentration is low, and the consumption of the mineral-coated nano zero-valent iron is large, and is beneficial to the removal of the TCM. When the concentration of the simulated TCM was 10 mg/ L, the dosage of Kaolin-n ZVI, Bennite-n ZVI and Zeolite-n ZVI was 1.5 g/ L, the p H was 5, the dechlorination of the reaction was good, and the dechlorination rate of the TCM was 73.1%, 70.9% and 74.4%, respectively. The coated nano-valent iron was prepared by using the cheap and environment-friendly Agar, CMC and Starch as the surface modifier. The results show that the main factors that affect the removal effect of TCM include Agar-n ZVI, CMC-n ZVI, the addition of search-n ZVI, the initial concentration of TCM and the flow of water. The removal efficiency of the TCM is not affected by the concentration of the waste water when the dosage is sufficient. At the simulated TCM wastewater concentration of 0.1 mg/ L, Agar-n ZVI, CMC-n ZVI, Starch-n ZVI, n ZVI dosage of 0.04 g/ L and flow rate of 5 m L/ min, the removal effect of the sampling port close to the water outlet at 1 h is the best, and the removal rate is 99.21%, 98.13% and 97.6%, respectively. The system of the coated nano-zero-valent iron reduction and degradation TCM meets the quasi-primary reaction kinetics, and the reaction rate decreases with the increase of the initial concentration of the TCM, The main influencing factors of CMC-coated nano-zero-valent iron degradation of trichloromethane (TCM) and lead were: the dosage of CMC-coated nano-zero-valent iron, the initial concentration of TCM and lead, the reaction time and the initial p-H value. The results show that the dosage of the higher CMC-coated nano-zero-valent iron and the low initial TCM and lead concentration are beneficial to the degradation reduction. The concentration of the TCM is 0.4 mg/ L, the concentration of Pb ~ (2 +) is 40 mg/ L, the p H value is 5.0, the dosage of CMC-n ZVI is 1 mg/ L, and the effect of the reaction is better. The removal rate of TCM and Pb ~ (2 +) was 96.5% and 92.0%, and the total removal rate was 94.3%. The main influencing factors of the green synthesis of the green-synthesized nano-zero-valent iron in the extraction of the leaves of the leaves of the leaves of the purple leaves include the initial concentration of the TCM, the p-H value and the initial p-H value. The results of the experiment show that the nano-zero-valent iron prepared by the extract of the leaves of the leaf of the leaves of the purple leaves has good dispersibility, and the average particle size is about 20-50 nm. The green-synthesized nano-zero-valent iron has better effect of removing CTC in water. The effect of green-synthesized nano-zero-valent iron on CTC removal efficiency is the initial concentration of CTC, the value of p H, and the dosage of green synthetic nanometer zero-valent iron. When the initial concentration of CTC is 4 mg/ L, the value of p H is 6.0, the dosage of green synthetic nanometer zero-valent iron is 0.14 g/ L, the removal effect is better when the reaction is 90 min, and the removal rate of CTC is 99.8%.
【學(xué)位授予單位】:景德鎮(zhèn)陶瓷大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2016
【分類號】:X523
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