【摘要】：以黏土質(zhì)白云巖為原料經(jīng)煅燒、碳酸化處理后,研究固液比、溶液初始pH值、反應(yīng)時(shí)間、初始濃度等因素對(duì)其去除鎘離子效果的影響,并對(duì)去除機(jī)理進(jìn)行了探討。結(jié)果表明:隨著固液比增大,溶液中鎘離子濃度先降低然后趨于穩(wěn)定;煅燒-碳酸化黏土質(zhì)白云巖(CCCD)去除水中鎘離子受溶液初始pH值的影響較小,對(duì)不同初始pH值的鎘溶液都有較好的處理效果。動(dòng)力學(xué)數(shù)據(jù)表明,鎘離子的去除符合準(zhǔn)二級(jí)動(dòng)力學(xué)方程(R~2≥0.996);Langmuir等溫吸附模型更好地描述CCCD對(duì)鎘離子的去除過(guò)程;熱力學(xué)結(jié)果表明吸附類型是化學(xué)吸附。CCCD去除水中鎘離子的主要作用機(jī)理是方鎂石緩慢與水反應(yīng)生成氫氧化鎂,氫氧化鎂電離產(chǎn)生氫氧根,使溶液的pH值升高,誘導(dǎo)鎘離子水解,進(jìn)而形成表面沉淀。
[Abstract]:After calcination and carbonation of clay dolomite, the effects of solid-liquid ratio, initial pH value of solution, reaction time and initial concentration on the removal of cadmium ion were studied. The results show that with the increase of solid-liquid ratio, the concentration of cadmium in the solution decreases first and then tends to stabilize, and the removal of cadmium ion from water by calcined carbonated clay dolomite (CCCD) is less affected by the initial pH value of the solution. The cadmium solution with different initial pH values has a good treatment effect. The kinetic data show that the removal of cadmium ion accords with the quasi-second-order kinetic equation (Ru _ 2 鈮，

本文編號(hào)：2271899