writer：Mudasir Ahmad, Baoliang Zhang?, JiqiWang, Jia Xu, KaiserManzoor, Suhail Ahmad, Saiqa Ikram
keywords：Diphenylcarbazide, Chitosan, Diazotization
source：期刊
specific source：International Journal of Biological Macromolecules 136 (2019) 189–198 https://doi.org/10.1016/j.ijbi
Issue time：2019年

In this work, a simple method was developed for hydrogel preparation from 1,5-Diphenylcarbazide (DPC) and chitosan (CS) throughDiazotization reaction of CS as a selective adsorbent (DPCCS) for Cu(II) ions. CSwas treated with sodiumnitrate and subsequent crosslinking reactionwith DPC for the preparation of DPCCS. Different techniqueswere used for characterization of DPCCS. Various parameters such as, temperature, pH, and concentration of Cu(II) were used for adsorption studies. Kinetics of Cu(II) ion on DPCCS follows the Pseudo second order and equilibrium of adsorption occurs in short time. The equilibriumdata was best fitted with the Langmuir isotherm and the maximumadsorption capacity of DPCCS was 185.505 mg g?1. Thermodynamic parameters ΔG°, ΔH° and ΔS° suggested that the adsorption of Cu(II) ion on the surfaces of DPCCSwas spontaneous, endothermic and randomness of Cu(II) ion in the solution was enhanced respectively. Regeneration of DPCCS and Cu(II) ion recoverywere studied up to five cycles without the lost of the adsorption capacity.