Page 188 - 《精细化工》2022年第10期

第 39 卷第 10 期 精 细 化 工 Vol.39, No.10
2022 年 10 月 FINE CHEMICALS Oct. 2022

水处理技术与环境保护
ZIF-8 负载海藻酸钠/氧化石墨烯基底

用于吸附盐酸四环素

王少婷 1,2 ，强涛涛 1,2 ，王志宏 1,2 ，任龙芳 1,2*

（1. 陕西科技大学 轻工科学与工程学院，陕西 西安 710021；2. 轻化工程国家级实验教学示范中心，
陕西 西安 710021）

摘要：为了解决金属-有机骨架材料 ZIF-8 在水溶液中难以回收的问题，采用直接滴加法将海藻酸钠（SA）和氧
2+
化石墨烯（GO）混合液滴入 Ca 溶液中，交联形成 SA/GO 凝胶基底，再将 ZIF-8 原位生长在 SA/GO 基底上，
制得了 SA/GO/ZIF-8 复合吸附剂，并用于去除环境废水中盐酸四环素（TC）。采用 XRD、TEM 和 SEM 对其进
行了表征。结果表明，ZIF-8 在 SA/GO 凝胶基底上均匀生长，且 ZIF-8 的负载率高达 34.21%。当温度为 25 ℃、
pH=7、TC 质量浓度为 50 mg/L 时，30 mg SA/GO/ZIF-8 复合吸附剂对 TC 的平衡吸附量可达 125.37 mg/g。吸附
动力学和等温线结果表明，SA/GO/ZIF-8 对 TC 的吸附过程受化学活性位点控制，属于活性位点均匀的单层吸附。
在循环吸附 5 次后，SA/GO/ZIF-8 复合吸附剂对 TC 的去除率仍在 85%以上。
关键词：海藻酸钠；氧化石墨烯；盐酸四环素；单层吸附；ZIF-8；高负载量；水处理技术
中图分类号：X592 文献标识码：A 文章编号：1003-5214 (2022) 10-2122-10

Sodium alginate/graphene oxide substrate loaded with ZIF-8
for adsorption of tetracycline hydrochloride

1,2
1,2
1,2
WANG Shaoting , QIANG Taotao , WANG Zhihong , REN Longfang 1,2*
（1. College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science & Technology, Xi'an
710021, Shaanxi, China; 2. National Demonstration Center for Experimental Light Chemistry Engineering Education,
Xi'an 710021, Shaanxi, China）
Abstract: To solve the difficult recovery problem of metal-organic framework material ZIF-8 from aqueous
solution, sodium alginate (SA)/graphene oxide (GO)/ZIF-8 composite adsorbent was synthesized by in situ
growth of ZIF-8 on SA/GO substrate, which was prepared by direct drop addition of SA/GO mixed
2+
dispersion liquid into Ca solution, cross-linking to form SA/GO gel substrate and then used to remove
tetracycline hydrochloride (TC) from environmental wastewater. The samples obtained were characterized
by XRD, TEM and SEM. The results showed that ZIF-8 was dispersed uniformly on SA/GO gel substrate
with a calculated loading rate of as high as 34.21%. When the temperature was 25 ℃, pH=7 and TC mass
concentration was 50 mg/L, the equilibrium adsorption capacity of SA/GO/ZIF-8 composite adsorbent (30 mg)
for TC reached up to 125.37 mg/g. Adsorption kinetics and isotherm results revealed that the adsorption
process of TC by SA/GO/ZIF-8 was mainly chemo-adsorption, monolayer adsorption with uniform active
sites distribution. Furthermore, after 5 times of cyclic adsorption, the removal rate of TC by SA/GO/ZIF-8
composite adsorbent was still above 85%.
Key words: sodium alginate; graphene oxide; tetracycline hydrochloride; monolayer adsorption; ZIF-8;
high loading; water treatment technology

据统计，每年畜牧业所使用的抗生素已超过 10 万吨，并且约 80%的动物流感病均需服用抗生素 [1-4] 。

收稿日期：2022-02-10; 定用日期：2022-06-06; DOI: 10.13550/j.jxhg.20220122
基金项目：陕西省重点科技创新团队（2020TD-009）；陕西省教育厅青年创新团队建设科研计划项目（21JP014）
作者简介：王少婷（1998—），女，硕士生，E-mail：996277662@qq.com。联系人：任龙芳（1981—），女，教授，E-mail：renlf1010@163.com。