采用氢氧化钠对麦饭石进行改性,考察了改性麦饭石投量、pH值、吸附时间和吸附温度对水中氨氮吸附效果的影响。对其吸附等温曲线进行了分析,并通过扫描电子显微镜(SEM)、比表面积(BET)和X射线衍射(XRD)表征方法对改性麦饭石的吸附机理进行了探究。结果表明:改性麦饭石对水中氨氮的去除效果远远优于天然麦饭石,对50mL的氨氮质量浓度为5mg/L废水中氨氮的去除率高达86.6%;Freundlich吸附等温方程能更好地描述改性麦饭石对水中氨氮的吸附行为;SEM和BET表征结果证明了该改性方法有效增大了麦饭石的比表面积及总孔体积;XRD表征结果证明了废水中的氨氮附着在改性麦饭石上,其反应机理不仅包括物理作用还包离子交换作用。
Maifan stone was modified by sodium hydroxide.The effect of the dosage of modified clinoptilolite,the value of pH,the contact time and temperature on simulated wastewater were investigated.Analyzing the adsorption isotherm,and through SEM,BET and XRD,the adsorptive capability of maifan stone in removing ammonium was investigated.The results showed that the modified maifan stone can effectively improve the adsorption ion capacity of natural maifan stone.Dealing with 50mL simulated wastewater with total ammonium 5mg/L,the removal rate reached at 86%.Freundlich equation was better in describing the behavior of ammonium adsorption on modified maifan stone.SEM and BET results showed that this modified method effectively increased the specific surface area and total pore volume of maifan stone.XRD results demonstrated that phosphorus appeared on the surface of modified maifan stone and the reaction mechanism involved not only had the physical effects also included ion exchange.
[1] 李烨,李建民,潘涛.地下水氨氮污染及处理技术综述[J].环境工程,2011,192(S1):100-102.
[2] 姜霞,周小宁,丁明玉,等.天然沸石及改性沸石去除低浓度氨氮的研究[J].环境科学研究,2008,21(5):37-42.
[3] 蔡鲁峰,李娜,杜莎,等.N-亚硝基化合物的危害及其在体内外合成和抑制的研究进展[J].食品科学,2016,37(5):271-277.
[4] 王和云,于丹,倪乐意.浅析轮藻植物与水体富营养化的关系[J].长江流域资源与环境,2014,23(5):693-699.
[5] 文科,刘国庆,殷艳珍,等.齐齐哈尔碾子山麦饭石岩石矿物学特征研究[J].矿物岩石,2016,36(3):1-7.
[6] 陈红,阳旭,赵丽芹,等.不同矿石对反渗透淡化水的调质效果研究[J].浙江大学学报,2016,43(2):231-236.
[7] 陈琳荔,邹华.改性麦饭石对水中氮磷的去除[J].食品与生物技术学报,2015,34(3):283-290.
[8] 郭华,王军林,张晓燕,等.沸石负载高锰酸钾去除低浓度氨氮[J].环境工程学报,2015,9(9):4321-4325.
[9] 李雪英,瞿广飞,曾金花.丝光沸石静态吸附牛尿废水中氮的实验研究[J].材料导报,2013,27(7):78-81.
[10] Ei-sheikh A H,Newman A P,Said A J,et al.Improving the adsorption efficiency of phenolic compounds into olive wood biosorbents by pre-washing with organic solvents:equilibrium,kinetic and thermodynamic aspects[J].Journal of Environmental Management,2013,118:1-10.
基金资助
国家水体污染控制与治理科技重大专项(2014ZX07105-001)
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