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铜基氮碳微球对废水中盐酸四环素的吸附性能

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以水溶性低相对分子质量壳聚糖(0.1000 g)为碳源和氮源,Cu(NO3)2·3H2O(0.2174、0.2899、0.6522 g)为铜源,采用一步水热法制备了 3种铜基氮碳微球Cu-x/NC(x=1、2、3),通过SEM、FTIR、XRD、Raman光谱和BET对Cu-x/NC进行了表征,通过静态吸附实验考察了 Cu-x/NC对盐酸四环素(TC)的吸附性能,并测定了吸附动力学、吸附等温线和吸附热力学参数,测试了 Cu-x/NC抗离子干扰、pH稳定性和循环吸附性能.结果表明,Cu-x/NC呈规整的球形结构,表面有含氧和含氮基团,并均匀分布着Cu元素;在25 ℃吸附温度和24 h吸附时间的条件下,Cu-2/NC(5mg)表现出吸附TC的最大平衡吸附容量(1993.42 mg/g);Cu-2/NC吸附TC符合Langmuir等温线模型和准二级动力学模型,吸附过程是自发、吸热过程;TC溶液中存在NaCl不会降低Cu-2/NC吸附TC的平衡吸附容量,TC溶液在pH=5.5时对吸附最有利;7次循环吸附测试中,Cu-2/NC对TC表现出较为稳定的去除率(95.84%~86.67%);Cu-2/NC吸附TC依靠的主要作用力有氢键、Cu阳离子桥、电子供体-受体相互作用以及静电作用.
Adsorption of tetracycline in wastewater by copper-based nitrogen-carbon microspheres
Three copper-based nitrogen-carbon microspheres Cu-x/NC(x=1,2,3)were successfully synthesized by a one-step hydrothermal method using water-soluble low relative molecular mass chitosan(0.1000 g)as carbon and nitrogen sources,copper nitrate trihydrate(0.2174,0.2899,0.6522 g)as copper sources,characterized by SEM,FTIR,XRD,Raman spectroscopy and BET,and then evaluated via static adsorption experiments for their tetracycline hydrochloride(TC)adsorption performance,of which the adsorption kinetics,adsorption isotherms and thermodynamic parameters as well as the resistance to ion interference,pH stability and cyclic adsorption performance were further analyzed.The results showed that Cu-x/NC exhibited a regular spherical structure with oxygen-containing and nitrogen-containing groups on the surface and a uniform distribution of Cu elements.Cu-2/NC(5 mg)exhibited the maximum adsorption capacity for TC(1993.42 mg/g)at 25 ℃ for 24 h,and followed the Langmuir isotherm model and pseudo-second-order kinetic model,with a spontaneous and endothermic adsorption process.The presence of NaCl in TC solution didn't reduce the equilibrium adsorption capacity of Cu-2/NC toward TC,and TC solution at pH=5.5 was most favorable for adsorption.In the 7-cycle adsorption tests,Cu-2/NC showed a relatively stable removal rate to TC(95.84%~86.67%).The main driving force for TC adsorption by Cu-2/NC was attributed to hydrogen bond,Cu cation bonding bridge,electron donor-acceptor interaction and electrostatic interactions.

adsorptionchitosannitrogen-carbon microspherestetracycline hydrochlorideaction mechanismwater treatment technology

牛戈、王磊超、华明清、黄燕、巢艳红、朱文帅

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江苏大学化学化工学院,江苏镇江 212013

中国石油大学(北京)化学工程与环境学院重质油全国重点实验室,北京 102249

海南省水环境污染治理与资源化重点实验室,海南海口 571158

吸附 壳聚糖 氮碳微球 盐酸四环素 作用机理 水处理技术

国家自然科学基金项目海南省自然科学基金创新研究团队项目海南省水环境污染治理与资源化重点实验室项目

22278426220CXTD436SHJKFKT 202304

2024

精细化工
大连化工研究院设计院 中国化工学会精细化工专业委员会 辽宁省化工研究院

精细化工

CSTPCD北大核心
影响因子:0.557
ISSN:1003-5214
年,卷(期):2024.41(10)
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