發(fā)布時(shí)間：2019-05-21 22:25

【摘要】：為了更好的去除水體中微量汞,研究了采用二氧化錳和殼聚糖對(duì)天然斜發(fā)沸石進(jìn)行改性,著重考察了pH、溫度、離子強(qiáng)度、Hg~(2+)初始濃度和時(shí)間對(duì)改性前后沸石吸附Hg~(2+)的影響,并研究了其吸附機(jī)理。結(jié)果表明,改性沸石受pH、溫度和離子強(qiáng)度影響較小,在pH、溫度、離子強(qiáng)度和初始濃度為6、25℃、0.05 mol·L~(-1)和50μg·L~(-1)時(shí),二氧化錳+殼聚糖改性沸石(ZCM)對(duì)Hg~(2+)的去除率高達(dá)99%,符合國家飲用水標(biāo)準(zhǔn),并且二氧化錳+殼聚糖改性沸石(ZCM)具有更好的解吸再生性。3種沸石均較好的符合Langmuir等溫吸附模型和假二級(jí)動(dòng)力學(xué)模型,其中改性沸石對(duì)汞的吸附主要為離子交換和表面官能團(tuán)的絡(luò)合作用,二氧化錳+殼聚糖改性沸石(ZCM)和殼聚糖改性沸石(ZC)飽和吸附量由1.43 mg·g~(-1)提高到5和3.3 mg·g~(-1),吸附平衡時(shí)間由10 h減少至1和4 h,為治理汞微污染地表水提供一定的理論支持。
[Abstract]:In order to remove trace mercury from water better, the modification of natural clinoptilolite with manganese dioxide and chitosan was studied, and the temperature and ion strength of pH, were investigated. The effect of initial concentration and time of Hg~ (2) on the adsorption of Hg~ (2) by zeolites before and after modification was studied, and the adsorption mechanism was studied. The results show that the modified zeolites are less affected by pH, temperature and ion strength. When the pH, temperature, ion strength and initial concentration are 6, 25 鈩，

本文編號(hào)：2482450