Adsorption behavior of heptyl xanthate on surface of ZnO and Cu(Ⅱ) activated ZnO using continuous online in situ ATR-FTIR technology  

连续在线原位ATR-FTIR技术研究庚基黄药在ZnO和Cu(Ⅱ)活化ZnO表面的吸附行为

作　　者：Qi SHEN Yun-hui ZHANG Ying-ju FAN Zheng-he XU Zhong-Xi SUN 沈琪;张云惠;范迎菊;徐政和;孙中溪(济南大学化学化工学院,济南250022;南方科技大学材料科学与工程系,深圳518055)

机构地区：[1]School of Chemistry and Chemical Engineering,University of Jinan,Jinan 250022,China [2]Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen 518055,China

出　　处：《Transactions of Nonferrous Metals Society of China》2022年第7期2370-2378,共9页中国有色金属学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos.51274104,50874052);the National Basic Research Program of China (No.2011CB933700)。

摘　　要：A continuous online in situ attenuated total reflection Fourier-transform infrared(ATR-FTIR)spectroscopic technique was used to investigate the adsorption and desorption kinetics of heptyl xanthate(KHX)on the surface of ZnO and Cu(Ⅱ)activated ZnO.The results showed that Cu(Ⅱ)facilitated the xanthate adsorption process on the surface,and led to the formation of cuprous xanthate(CuX),dixanthogen(X_(2))and xanthate aggregates.The adsorption of xanthate on the surface of ZnO and Cu(Ⅱ)activated ZnO was found to both follow the pseudo-first-order kinetic model.When the NaOH solution was used as a desorption agent,the adsorbed xanthate can largely be removed due to the competition between OH^(−)and HX−.However,for Cu(Ⅱ)activated ZnO,the peak intensities at 1197 and 1082 cm^(−1) had no obvious weakening,and the absorption intensities at 1261 and 1026 cm^(−1) increased in the first 5 min,indicating an ion-exchange reaction between OH^(−)and surface zinc bonded xanthate HX−and the reorganization of adsorbed xanthate.采用连续在线原位衰减全反射傅里叶变换红外光谱(ATR-FTIR)技术研究庚基黄原酸盐(KHX)在合成高纯氧化锌和Cu(Ⅱ)活化氧化锌矿物表面的吸附和解吸动力学。研究结果表明,添加Cu(Ⅱ)能显著提高KHX在ZnO表面的吸附率,生成黄盐酸亚铜、双黄原和黄原酸盐聚集体。研究发现KHX在氧化锌和Cu(Ⅱ)活化氧化锌表面吸附符合拟一级动力学模型。由于OH^(-)和HX^(-)离子竞争,NaOH水溶液作为解吸剂可基本脱出氧化锌表面吸附的KHX。而对于Cu(Ⅱ)活化氧化锌表面,1197和1082 cm^(-1)处的峰强度没有明显减弱,在1261和1026 cm^(-1)吸附强度在前5 min增加,表明表面吸附HX-和OH-之间的离子交换反应和表面吸附KHX的重组作用。

关 键 词：ZNO Cu(Ⅱ) activation continuous online in situ ATR-FTIR heptyl xanthate adsorption kinetics 

分 类 号：TD952[矿业工程—选矿] TD923