Characterization and Optimization of Polymeric Bispicolamine Chelating Resin: Performance Evaluation via RSM Using Copper in Acid Liquors as a Model Substrate through Ion Exchange Method

Abstract

Advanced technologies of electronics industries have led to environmental contamination concerns, especially waste print circuit boards containing a very high concentration of copper (II) ions, which can be discharged in wastewater containing many contaminated metals. A low pH is a necessity for treating industrial wastewater containing heavy metals to meet engineering process design. A novel polymeric bispicolamine chelating resin, Dowex-M4195, was applied as an alternative for investigating the behavior of copper (II) in acidic solution via an ion exchange method in a batch experiment system. Characterization of physical and chemical properties before and after ion exchange were also explored through BET, SEM-EDX, FTIR and XRD. Response surface methodology was also applied for optimization of copper (II) removal capacity using design of experiment for selective chelating resin at a low pH. The results indicate that H+ Dowex-M4195 chelating resin had a high-carbon content and specific surface area of >64% and 26.5060 m2/g, respectively. It was predominantly macropore porous in nature due to the N2 gas adsorption isotherm and exhibited type IV with insignificant desorption hysteresis loop of H1-type. It was spherical and cylindrical. After the ion exchange process of copper (II)-loaded H+ Dowex-M4195, the specific surface area and total pore volume decreased by about 17.82% and 5.39%, respectively, as compared to H+ Dowex-M4195. Hysteresis loop, isotherm and pore size distribution were also similar. Regarding the functional group, the surface morphology and crystalline structures of H+ Dowex-M4195 showed copper (II) compound based on the structure of chelating resin that confirmed effective ion exchange behavior. The design of optimization indicated that copper (II) removal capacity of about 31.33 mg/g was achieved, which could be obtained at 6.96 h, pH of 2 (a desirable low pH), dose of 124.13 mg and concentration of 525.15 mg/L. The study indicated that the H+ Dowex-M4195 (which is commercially available on the market) can successfully be applied as an alternative precursor through the ion exchange method for further reuse and regeneration of the copper (II) in the electronic waste industries and other wastewater applications needed to respond the policy of biocircular green economy in Thailand.

Selective recovery of copper from copper tailings and wastewater using chelating resins with bis-picolylamine functional groups

“…For instance, the formation of strong Cu-bispicolylamine complexes often induces changes in the vibrational modes of the chelating groups to higher wavenumbers. This phenomenon is consistent with findings in the literature [ 1 , 4 , 29 , 33 , 34 ]. On the other hand, increased intensity in certain bands can be ascribed to the strengthening of chemical bonds upon Cu(II) adsorption [ 35 ].…”

New Chelate Resins Prepared with Direct Red 23 for Cd2+, Ni2+, Cu2+ and Pb2+ Removal

“…Additionally, chelating resin H + Dowex-M4195 was tested for Cu 2+ adsorption. The SEM image of chelating resin loaded with Cu 2+ has a smoother surface reported with the resin used before adsorption [39]. 10a-d.…”

Adsorption–Desorption Process to Separate Dyes from Tanning Wastewaters

“…Considering the generally high cost of wastewater treatment [83][84][85][86][87][88][89][90][91], in this work, we investigated the possible on-site depuration of exhaust dye solutions used in the leather industry before discharging them to the traditional sewage system. This work aimed to study the adsorption treatment of the effluent of a specific coloring drum used in the leather industry in place of testing the mixture of diluted dyes transferred to a wastewater treatment plant.…”