摘要
以氧化石墨烯(GO)、聚乙烯醇(PVA)为原料,3-缩水甘油醚氧基丙基三甲氧基硅烷(GLYMO)为桥接剂,采用原位水热法制备氧化石墨烯/聚乙烯醇(GPGO)复合吸附剂。借助红外、扫描电镜等表征GPGO的结构,通过静态吸附实验探索m(GLYMO)、pH值、吸附时间、Cr(Ⅵ)初始质量浓度、共存阴离子对GPGO吸附Cr(Ⅵ)性能的影响。结果表明,GLYMO的桥接作用和强酸环境可极大地促进GPGO对Cr(Ⅵ)的吸附。二级动力学和Langmuir等温吸附模型能够很好地描述GPGO对Cr(Ⅵ)的吸附过程,由Langmuir模型计算出GPGO吸附剂对Cr(Ⅵ)的最大吸附量为384.6 mg/g。Cl^(-)和NO^(-)_(3)的存在对GPGO吸附Cr(Ⅵ)性能影响不大,但SO^(2-)_(4)对该吸附过程产生较强的抑制作用。
Graphene oxide/polyvinyl alcohol(GPGO)composite adsorbents were prepared by in-situ hydrothermal method using graphene oxide(GO)and polyvinyl oxide(PVA)as raw materials,3-glycidyl ether oxypropyl trimethoxysilane(GLYMO)as linker.The structure of the GPGO adsorbent was characterized by modern methods including infrared and scanning electron microscopy.The effects of m(GLYMO),pH value,adsorption time,Cr(Ⅵ)initial mass concentration,and coexisting anions on the adsorption performance of GPGO for Cr(Ⅵ)were measured through static adsorption experiments.The research results indicate that the linking effect of GLYMO and strong acidic environment can greatly promote the adsorption of GPGO for Cr(Ⅵ).The second-order kinetics and Langmuir isotherm adsorption model can well describe the adsorption process of GPGO on Cr(Ⅵ).The Langmuir model calculates that the maximum adsorption capacity of GPGO adsorbent on Cr(Ⅵ)is 384.6 mg/g.The presence of Cl^(-) and NO^(-)_(3) has little effect on the adsorption performance of GPGO for Cr(Ⅵ),but SO^(2-)_(4) has a strong inhibitory effect on this adsorption process.
作者
刘小静
李俊燕
党泽静
祖丹怡
吴代文
LIU Xiaojing;LI Junyan;DANG Zejing;ZU Danyi;WU Daiwen(School of Chemistry and Materials,Weinan Teachers University,Weinan 714099,China;Key Laboratory for Ecology and Environment of River Wetlands in Shaanxi Province,Weinan 714099,China)
出处
《化工科技》
CAS
2024年第2期22-27,共6页
Science & Technology in Chemical Industry
基金
国家级大学生创新创业训练计划项目(22xk024)
陕西省教育厅重点实验室项目(23JS024)
渭南师范学院横向项目(2023HX137)。
