Study on the treatment of wastewater containing Cu(II) by D851 ion exchange resin

Abstract

A static adsorption experiment of copper ion was performed with D851 ion exchange resin to determine some optimum treatment parameters. The results of the experiment showed that the enthalpy value of the reaction was positive and the optimum reaction time was 60 min, while the optimum pH value and reaction temperature were 5.5 and 35˚C, respectively. The adsorption equilibrium density of 0.1 g ion exchange resin was between 75 and 100 mg/L. With the condition of the hydraulic retention time of 60 min, wastewater containing 10 mg/L Cu(II) (pH ≈ 5.5) was treated by a dynamic ion exchange column, and the treatment effluent can meet the primary standard of the National Integrated Wastewater Discharge Standard (GB8978-1996). Meanwhile a desorption experiment with ion exchange resin was carried out, which determined that the optimum volume fraction of hydrochloric acid solution was 4% in the desorption solution. The figures of the scanning electron microscope showed that the resin saturated with Cu(II) could be regenerated well under the effect of hydrochloric acid solution, which was consistent with the experimental results.

Environmentally Friendly in Situ Regeneration of Graphene Aerogel as a Model Conductive Adsorbent

“…We then explored the traditional regeneration efficiency of saturated GA–Cu 2+ , as shown in Figures b–d. The conventional regeneration method for metal ion adsorbents generally requires a high concentration of hydrochloric acid of >100 mM. , For comparison, GA was regenerated by 100 mM HCl, and the results in Figure b indicated that the initial collected effluent concentration of Cu 2+ was as high as 260.5 mg L –1 with [Cu 2+ ] eff /[Cu 2+ ] in = 40.4, suggesting that adsorbed Cu 2+ was exchanged with excess H + and that the recovery ratio was nearly 100%. However, the ratio of influent H + versus the desorbed Cu 2+ , H + inf /Cu 2+ desorb , was close to 200, indicating that H + must be in large excess for thorough Cu 2+ desorption (Figure c), and the pH value, ∼1.0, of the effluent solution is too low (Figure d) to discharge into the environment.…”

Removal of Cu (II) by ion exchange resin and its re-utilization of the residual solution from the distilled Lycium barbarum wine

“…Eqs. (8) 、(9) were used to calculate the thermodynamic parameters for the adsorption of Cu (II) onto the D401 resin, including ΔG (kJ·mol −1 ), ΔS (J·mol −1 ·K −1 ) and ΔH (kJ·mol −1 ), were calculated with the following equations( He et al, 2014 ): where R (8.314 J/mol · K) is the gas constant, T (K) stands for the absolute temperature, and K L (L/mg) is the standard thermodynamic equilibrium constant defined by Q e / C e The values ΔH and ΔS can be calculated from the slope and intercept of Vant's Hoff plots of ln K L vs T / 1.…”

Modeling Date Palm Trunk Fibers (DPTF) Packed Bed Adsorption Performances for Cadmium Removal from Aqueous Wastewater

“…There are several processes used for wastewater polluted with heavy metal ions like chemical precipitation techniques [17,18], membrane processes [19,20], electro dialysis [21], ion exchange process [22], flotation [23], extraction [24], and adsorption [25,26]. Adsorption is considered a meaningful and good alternative from an economic view due to its simplicity, availability, and low cost [27,28].…”