改性海泡石处理水中低质量浓度NO_3~-的研究
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摘要
实验制备酸洗及负载纳米零价铁的海泡石,进行改性海泡石吸附及还原水中低质量浓度NO~-_3的实验研究。结果表明,对于酸洗海泡石(PNS)吸附NO~-_3,吸附效果高于天然海泡石,Freundlich模型比Langmuir模型更好地拟合NO~-_3等温吸附曲线,吸附过程为物理吸附非自发过程,吸附为放热反应,温度升高不利于吸附进行;负载纳米零价铁的海泡石(PNS-nZVI)处理水中NO~-_3符合准一级反应动力学模型。在一定范围内,酸性条件下促进NO~-_3的去除,质量浓度越大去除效果越好,温度在30℃时去除率达到峰值,最佳条件下去除率可达到95.4%。PNS-nZVI还原NO~-_3是一个递进过程,初始阶段NO~-_3先转化成中间产物NO~-_2和部分NH~+_4,随着反应进行NO~-_2逐步转化成NH~+_4,NH~+_4在反应产物中所占比重最大。
In this research, acid washed and loaded nanoscale zero valent iron sepiolite was used to adsorb and restore low mass concentration NO~-_3 in water by modified sepiolite. The results show that the adsorption effect of pickling sepiolite(PNS) on NO~-_3 is higher than that of natural sepiolite. The Freundlich model is better than the Langmuir model to fit the NO~-_3 isothermal adsorption curve. The adsorption process is a non spontaneous process of physical adsorption, the adsorption is exothermic reaction, and the increase of temperature is not beneficial to the adsorption. For PNS-nZVI loaded with nanoscale zero valent iron, NO~-_3 in water treated by PNS-nZVI conforms to the quasi-first-order reaction kinetic model. In a certain range, the removal of NO~-_3 is promoted under the acidic condition. The higher the mass concentration, the better the removal efficiency, the removal rate reaches the peak at 30 ℃, and the removal rate under the best condition can reach 95.4%. The reduction of NO~-_3 by PNS-nZVI is a progressive process. At the initial stage, NO~-_3 is converted into intermediate product NO~-_2 and partial NH~+_4. As the reaction proceeds, NO~-_2 is gradually converted to NH~+_4, and NH~+_4 accounts for the largest proportion in the reaction products.
In this research, acid washed and loaded nanoscale zero valent iron sepiolite was used to adsorb and restore low mass concentration NO~-_3 in water by modified sepiolite. The results show that the adsorption effect of pickling sepiolite(PNS) on NO~-_3 is higher than that of natural sepiolite. The Freundlich model is better than the Langmuir model to fit the NO~-_3 isothermal adsorption curve. The adsorption process is a non spontaneous process of physical adsorption, the adsorption is exothermic reaction, and the increase of temperature is not beneficial to the adsorption. For PNS-nZVI loaded with nanoscale zero valent iron, NO~-_3 in water treated by PNS-nZVI conforms to the quasi-first-order reaction kinetic model. In a certain range, the removal of NO~-_3 is promoted under the acidic condition. The higher the mass concentration, the better the removal efficiency, the removal rate reaches the peak at 30 ℃, and the removal rate under the best condition can reach 95.4%. The reduction of NO~-_3 by PNS-nZVI is a progressive process. At the initial stage, NO~-_3 is converted into intermediate product NO~-_2 and partial NH~+_4. As the reaction proceeds, NO~-_2 is gradually converted to NH~+_4, and NH~+_4 accounts for the largest proportion in the reaction products.
引文
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[3]赵爽,汪晓军,杨永愿.化学法处理低浓度硝酸盐氮废水的试验研究[J].工业水处理,2018,38(1):79-82.
[4]欧阳润东.大孔丙烯酸系离子交换树脂对硝酸根离子吸附性能的研究[D].南京:东南大学,2015.
[5]李琛,夏强,曹阳,等.酸洗海泡石对含Ni2+废水处理效果研究[J].电镀与精饰,2015,37(3):36-41.
[6]KHALIL AME,ELJAMAL O,JRIBI S,et al.Promoting nitrate reduction kinetics by nanoscale zero valent iron in water via copper salt addition [J].Chemical Engineering Journal,2015,287:367-380.
[7]DANESHKHAH M ,HOSSAINI H ,MALAKOOTIAN M.Removal of metoprolol from water by sepiolite-supported nanoscale zero-valent iron[J].Journal of Environmental Chemical Engineering,2017,5(4):3490-3499.
[8]张才灵,王娇茹,潘勤鹤,等.改性海泡石对重金属Pb2+的吸附机理研究[J].广州化工,2017,45(2):49-52.
[9]XU Y M,LIANG X F,SUN G H,et al.Effects of acid and heating treatments on the structure of sepiolite and its adsorption of lead and cadmium[J].Environmental Science,2010,31(6):1560-1567.
[10]肖辰畅,罗岳平,李彩亭,等.海泡石活化废酸复合絮凝剂处理印染废水的研究[J].四川环境,2012,31(3):13-17.
[11]颜酉斌,叶艳华,张洪林,等.改性海泡石对有机污染物氯苯的吸附研究[J].非金属矿,2009,32(6):64-66.
[12]高树梅,王晓栋,秦良,等.改进液相还原法制备纳米零价铁颗粒[J].南京大学学报(自然科学版),2007(4):358-364.
[13]马锋锋,赵保卫,钟金魁,等.牛粪生物炭对磷的吸附特性及其影响因素研究[J].中国环境科学,2015,35(4):1156-1163.
[14]范世锁,李雪,胡凯,等.污泥基生物炭吸附重金属Cd的动力学和热力学[J].环境工程学报,2016 (10):5971-5977.
[15]修瑞瑞,何世颖,宋海亮,等.改性硅藻土负载纳米零价铁去除水中硝酸盐氮[J].化工学报,2016,67(9):3888-3894.
[16]FU R,YANG Y,XU Z,et al.The removal of chromium (VI) and lead (II) from groundwater using sepiolite-supported nanoscale zero-valent iron (S-NZVI)[J].Chemosphere,2015,138:726-734.
[17]周雅琪.纳米铁炭复合材料去除地下水中硝酸盐研究[D].成都:成都理工大学,2015.
[18]刘雪妮,吴宏海,张苑芳,等.生物质炭负载纳米零价铁对水中硝态氮的还原去除机理研究[J].岩石矿物学杂志,2017,36(6):842-850.