摘要
含磷废水的排放会导致水体富营养化,对生态环境安全造成威胁。本文通过正交试验,制备了一种镍镁铝类水滑石(NiMgAl-HTLC),用于吸附去除废水中的磷元素,并采用SEM、EDS、TEM、XPS及BET等手段对材料进行了表征。为揭示NiMgAl-HTLC吸附磷的机理,对吸附过程的热力学、动力学和影响因素进行了研究。采用吸附除磷后的废水培养浮萍,评价了NiMgAl-HTLC对水体富营养化的抑制能力。结果表明:NiMgAl-HTLC的最佳制备条件为n(Ni)∶n(Mg)∶n(Al)=3∶1∶3,尿素溶液用量为20 mL,反应时间为10 h,反应温度为150℃。制得的NiMgAl-HTLC纳米片厚度约10 nm,比表面积为84.98 m^(2)·g^(-1);NiMgAl-HTLC对磷的最大吸附量为61.162 1 mg·g^(-1),吸附过程更符合二级动力学和Langumir热力学模型;在吸附除磷后的废水中,浮萍繁殖速度明显更慢,NiMgAl-HTLC对水体富营养化具有明显的抑制作用。
The discharge of wastewater containing phosphorus will lead to eutrophication and threaten ecological environment.In this article,a kind of NiMgAl-HTLC was synthesized by orthogonal experiment,which was used to remove phosphorus from wastewater.The properties of materials were characterized by SEM,EDS,TEM,XPS and BET.The adsorption mechanism was revealed by studying thermodynamics,kinetics and influencing factors in adsorption process.Finally,in order to evaluate the inhibition ability of NiMgAl-HTLC on water eutrophication,duckweed was cultured by wastewater after phosphorus removal.The results show that the optimum preparation conditions of NiMgAl-HTLC are as follows:the molar ratio of metal ions(Ni∶Mg∶Al)is 3∶1∶3,the dosage of urea solution is 20 mL,the reaction time is 10 h,and temperature is 150℃.The thickness of NiMgAl-HTLC nanosheets is about 10 nm,and the specific surface area is 84.98 m^(2)·g^(-1).The maximum phosphorus adsorption capacity of NiMgAl-HTLC is 61.1621 mg·g^(-1),and the adsorption process conforms to second-order kinetics and Langmuir thermodynamic model.The reproduction rate of duckweed in wastewater after phosphorus removal is slower significantly,indicating that NiMgAl-HTLC possess obvious inhibition on water eutrophication.
作者
周良芹
王蓉
范金龙
王佳妮
许腾飞
谭文渊
付大友
ZHOU Liangqin;WANG Rong;FAN Jinlong;WANG Jiani;XU Tengfei;TAN Wenyuan;FU Dayou(School of Chemical Engineering,Sichuan University of Science and Engineering,Zigong 643000,China;School of Materials Science and Engineering,Sichuan University of Science and Engineering,Zigong 643000,China)
出处
《硅酸盐通报》
CAS
北大核心
2024年第2期734-745,共12页
Bulletin of the Chinese Ceramic Society
基金
绿色催化四川省高校重点实验室项目(LZJ1704)
精细化工助剂及表面活性剂四川省高校重点实验室项目(2017JXY01)
四川省科技厅重点项目(2020YFS0347)。
关键词
磷
镍镁铝类水滑石
废水
吸附
富营养化
phosphorus
NiMgAl-hydrotalcite
waste water
adsorption
eutrophication
