仿生态Zn/Ti/Fe复合金属氧化物对水中NO_3-N的吸附
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摘要
以棉花为模板,类水滑石为前驱体,制备仿生态Zn/Ti/Fe复合金属氧化物(LDO)并用于水中NO_3-N的去除;考察了吸附时间、投加量、pH和初始浓度等因素对NO_3-N去除效果的影响,分析了吸附行为和机理。利用扫描电镜对样品的形貌进行表征分析。结果表明:棉花模板自身的纤维形态遗留到了LDO上。在25℃下,反应时间为120min,LDO投加量为0.67g/L,NO_3-N浓度50mg/L,pH=7,LDO达到吸附平衡,平衡吸附量为66.57mg/g,NO_3-N去除率为88.76%,出水浓度符合我国《生活饮用水卫生标准》(GB 5749—2006)。LDO对NO_3-N的吸附有较宽的pH范围。LDO吸附NO_3-N的过程符合准二级动力学模型,属于化学吸附。吸附等温线符合Langmuir吸附等温方程,表现为单分子层吸附。再生实验结果表明:LDO在紫外光照射下,再生性能好,可重复使用3次以上。
Using cotton as the template and hydrotalcite as precursor,biomimetic Zn/Ti/Fe complex metal oxide(LDO)was prepared to the removal of NO_3-N in water.The adsorption characteristics of NO_3-N from aqueous solution by LDO and its influencing factors,such as the solution contact time,dosage,pH and initial concentration were analyzed.The adsorption behavior and mechanism were also discussed.The morphologies of samples were characterized by SEM.The results indicated that LDO had the cotton fiber's own fiber morphology.The removal rate of NO_3-N was up to 88.76% when reaction time was 120 min,the dosage of LDO was 0.67 g/L,pH value was 7.0,temperature was25℃and the concentration of NO_3-N was 50 mg/L.The equilibrium adsorption capacity was 66.57 mg/g.Effluent concentration achieved Chinese"drinking water health standards"(GB 5749—2006).LDO adsorption of NO_3-N had a suitable pH range.The kinetic adsorption process was fitted by pseudo-second-order kinetic model,and the adsorption was mainly chemical adsorption.Langmuir equation could simulate the material process of isothermal adsorption of NO_3-N.The fitting results indicated that the adsorption of NO_3-N was monolayer adsorption.Regeneration experiments showed that LDO had better regeneration under ultraviolet light,and could be reused more than three times.
Using cotton as the template and hydrotalcite as precursor,biomimetic Zn/Ti/Fe complex metal oxide(LDO)was prepared to the removal of NO_3-N in water.The adsorption characteristics of NO_3-N from aqueous solution by LDO and its influencing factors,such as the solution contact time,dosage,pH and initial concentration were analyzed.The adsorption behavior and mechanism were also discussed.The morphologies of samples were characterized by SEM.The results indicated that LDO had the cotton fiber's own fiber morphology.The removal rate of NO_3-N was up to 88.76% when reaction time was 120 min,the dosage of LDO was 0.67 g/L,pH value was 7.0,temperature was25℃and the concentration of NO_3-N was 50 mg/L.The equilibrium adsorption capacity was 66.57 mg/g.Effluent concentration achieved Chinese"drinking water health standards"(GB 5749—2006).LDO adsorption of NO_3-N had a suitable pH range.The kinetic adsorption process was fitted by pseudo-second-order kinetic model,and the adsorption was mainly chemical adsorption.Langmuir equation could simulate the material process of isothermal adsorption of NO_3-N.The fitting results indicated that the adsorption of NO_3-N was monolayer adsorption.Regeneration experiments showed that LDO had better regeneration under ultraviolet light,and could be reused more than three times.
引文
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[3]GB 5749—2006.生活饮用水卫生标准[S].中华人民共和国卫生部,2006.
[4]Nancharaiah Y V,Venugopalan V P.Denitrification of synthetic concentrated nitrate wastes by aerobic granular sludge under anoxic conditions[J].Chemosphere,2011,85(4):683-688.
[5]Archna Sharrma,Ranbir Chander Sobti.Nitrate removal from ground water:a review[J].Journal of Chemistry,2015,9(9):1667-1675.
[6]Liu L,Wang D,Deng H,et al.The capability of estuarine sediments to remove nitrogen:implications for drinking water resource in yangtze estuary[J].Environmental Science &Pollution Research,2014,21(18):10890-10899.
[7]Westerhoff P,James J.Nitrate removal in zero-valent iron packed columns[J].Water Research,2003,37(8):1818-1830.
[8]张庆乐,董建,张丽青,等.改性茶叶渣/膨润土复合材料对饮水中硝酸盐的吸附性能[J].化工新型材料,2016,44(1):171-173.
[9]程珺煜,岳秀萍,曹岳,等.Zn/Al双金属氧化物对水中硫酸根离子的吸附性能[J].环境工程学报,2014,8(1):131-137.
[10]Xie L J,Chu W,Huang Y Y,et al.Preparation and characterization of biomorphic nickel oxide microtubes templated from cotton[J].Materials Letters,2011,65(2):153-156.
[11]段宁静.天然植物为模板CuO-Al2O3的制备及其吸附性能研究[D].秦皇岛:燕山大学,2015.
[12]Ding J,Fan T X,Zhang D,et al.Structural and optical properties of porous iron oxide[J].Solid State Communications,2011,151(10):802-805.
[13]Li Y,Wang J D,Wang X J,et al.Adsorption-desorption of Cd(Ⅱ)and Pb(Ⅱ)on camontmorillonite[J].Ind Eng Chem Res,2012,51:6520-6528.
[14]李春艳,蒋云福,赵俊,等.焙烧镁铝水滑石的制备及其对水中Cl-和SO24-的吸附特性[J].环境工程学报,2016,10(4):1719-1726.
[15]高乐乐,李秋荣,韩璐,等.生物遗态氧化锰基镁铝水滑石的制备及铅吸附性能[J].环境化学,2016,35(9):1961-1967.
[16]杨兴,张倩,汤超,等.改性竹叶对水中刚果红的吸附性能研究[J].化工新型材料,2017,45(10):244-246.
[17]张庆乐,董建,张丽青,等.草酸改性杨树叶对六价铬的吸附性能[J].环境工程,2015,33(5):64-69,94.
[18]戈明亮,杜明艺,王雁武.介孔材料麦羟硅钠石吸附Pb2+的行为及机理[J].硅酸盐学报,2017,45(1):37-45.
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