排序方式: 共有32条查询结果,搜索用时 653 毫秒
31.
The adsorption of lead, cadmium and nicel from aqueous solution by sawdust of walnut was investigated. The effect of contact time, initial metal ion concentration and temperature on metal ions removal has been studied. The equilibrium time was found to be of the order of 60 min. Kinetics fit pseudo first-order, second-order and intraparticle diffusion models, hence adsorption rate constants were calculated. The adsorption data of metal ions at temperatures of 25, 45 and 60~C have been described by the Freundlich and Langmuir isotherm models. The thermodynamic parameters such as energy, entropy and enthalpy changes for the adsorption of heavy metal ions have also been computed and discussed. Ion exchange is probably one of the major adsorption mechanisms for binding divalent metal ions to the walnut sawdust. The selectivity order of the adsorbent is Pb(I1)~Cd(II)〉Ni(I1). From these results, it can be concluded that the sawdust of walnut could be a good adsorbent for the metal ions from aqueous solutions. 相似文献
32.
Ongan Serdar Işık Cem Bulut Umit Karakaya Sahir Alvarado Rafael Irfan Muhammad Ahmad Munir Rehman Abdul Hussain Imran 《Environmental science and pollution research international》2022,29(31):46587-46599
Environmental Science and Pollution Research - We investigate the validity of the environmental Kuznets curve (EKC) hypothesis for the NAFTA countries. In this investigation, we approach this... 相似文献