Copper 2 sulfate pentahydrate cuso4 5h2o

Sodium hydroxide (NaOH), nitric acid (HNO₃), calcium chloride (CaCl₂), ethanol and copper(II) sulfate pentahydrate (CuSO₄·5H₂O) used in this work were purchased from Sinopharm Chemical Reagent Co. Ltd. (Shanghai, China, analytical purity). The stock solution was initially prepared by dissolving a well-known quantity of CuSO₄·5H₂O in pure and deionized water, prior to be diluted to reach tested concentrations at a given pH. Each pH adjustment was done using rather HNO₃ (0.1 mol/L) or NaOH (0.1 mol/L) solution with respect to the targeted Cu(II) concentration using the stock solution. Pomelo peels, used during this work, were obtained from a local market in Shijiazhuang City Hebei Province.

All chemicals used in our work were of analytical grade, and used without any further purification. Cetyltrimethylammonium bromide (CTMAB, A.R.) was purchased from Changzhou Xinhua Reagent Research Institute in China. Zn(Ac)₂·2H₂O was purchased from Tianjin Guangfu Fine Chemical Research Institute in China. Sodium hydroxide (NaOH, A.R.) was purchased from Beijing Chemical Works Research Institute in China. Potassium sodium tartrate tetrahydrate (C₄H₄O₆KNa·4H₂O, A.R.) was purchased from Tianjin Guangfu Technology Development Co. Ltd in China. Formaldehyde solution (HCHO, A.R.) was purchased from Tianjin Fuchen Chemical Reagents Factory in China. Ethylene diamine tetraacetic acid disodium (EDTA-2Na, A.R.) was purchased from Shenyang Reagent Factory in China. Copper(II) sulfate pentahydrate (CuSO₄·5H₂O, A.R.) was purchased from Sinopharm Chemical Reagent Co. Ltd in China. Ethanol and deionized water were used for all processes of washing and dissolution.