摘要
研究了福建酸竹笋壳生物炭吸附溶液中铜的性能,以及从Cu^(2+)/ReO_(4)^(-)二元体系中分离铼的可行性。通过静态吸附实验研究溶液初始pH值、吸附时间、吸附剂用量、吸附温度、初始吸附质量浓度对吸附Cu^(2+)的影响,通过选择性吸附实验研究pH值对Cu^(2+)/ReO_(4)^(-)二元体系选择性分离的影响。表征显示生物炭具有多孔结构,生物炭吸附Cu^(2+)的主要活性位点为其表面的羟基和羧基。通过调节溶液pH值,可实现生物炭对Cu^(2+)/ReO_(4)^(-)二元体系的选择性分离。生物炭对Cu^(2+)的吸附是弱化学吸附作用,吸附动力学符合Elovich动力学模型,等温吸附平衡符合entended Langmuir模型和Temkin模型。热力学数据ΔG和ΔH表明生物炭吸附Cu^(2+)的过程属于自发的吸热过程。生物炭吸附Cu^(2+)的机理为外层络合机理。选择性实验表明:生物炭作为吸附剂,可实现Cu^(2+)/ReO_(4)^(-)二元体系的选择性分离。生物炭可作为廉价吸附剂在含铼废水处理中发挥积极作用。
The adsorption copper and the separation of rhenium from Cu^(2+)/ReO_(4)^(-)binary system were investigated.The effects of initial pH,adsorption time,adsorbent dosage,adsorption temperature and initial adsorbate mass concentration on adsorption Cu^(2+)were studied by static adsorption experiments.The effect of pH on the selective separation of Cu^(2+)/ReO_(4)^(-)binary system was also studied by selective adsorption experiments.Characterization of BC showes that it has porous structure and the main adsorption sites of Cu^(2+)on BC are surface hydroxyl and carboxyl groups.The selective separation of Cu^(2+)/ReO_(4)^(-)binary system from BC can be realized by adjusting the pH.The adsorption of Cu^(2+)by BC is weak chemisorption,which is in agreement with the Elovich kinetic model.The data of the isotherm study agree better with the extended Langmuir and Temkin model.Thermodynamic data ofΔG andΔH prove a spontaneous and endothermal nature of Cu^(2+)sorption process.The mechanism of Cu^(2+)adsorption by BC is outer-sphere complexation.Selective studies indicate that BC is possible to recover ReO_(4)^(-)from the Cu^(2+)/ReO_(4)^(-)binary system.The prepared BC can play an active role as a low-cost adsorbent in rhenium-containing wastewater.
作者
廉宏艳
LIAN Hongyan(Engineering Technology Center Mechanical Engineering Technology Department,Northwest Electric Power Design Institute Co.,Ltd.of China Power Engineering Consulting Group,Xi′an 710075,Shaanxi Province,China)
出处
《化学工程》
CAS
CSCD
北大核心
2023年第10期36-41,共6页
Chemical Engineering(China)
关键词
生物炭
吸附
铼
铜
biochar
adsorption
rhenium
cooper
