From Green Remediation to Polymer Hybrid Fabrication with Improved Optical Band Gaps

Abstract

The present work proposed a novel approach for transferring high-risk heavy metals tometal complexes via green chemistry remediation. The method of remediation of heavy metals developed in the present work is a great challenge for global environmental sciences and engineering because it is a totally environmentally friendly procedure in which black tea extract solution is used. The FTIR study indicates that black tea contains enough functional groups (OH and NH), polyphenols and conjugated double bonds. The synthesis of copper complex was confirmed by the UV-vis, XRD and FTIR spectroscopic studies. The XRD and FTIR analysis reveals the formation of complexation between Cu metal complexes and Poly (Vinyl Alcohol) (PVA) host matrix. The study of optical parameters indicates that PVA-based hybrids exhibit a small optical band gap, which is close to inorganic-based materials. It was noted that the absorption edge shifted to lower photon energy. When Cu metal complexes were added to PVA polymer, the refractive index was significantly tuned. The band gap shifts from 6.2 eV to 1.4 eV for PVA incorporated with 45 mL of Cu metal complexes. The nature of the electronic transition in hybrid materials was examined based on the Taucs model, while a close inspection of the optical dielectric loss was also performed in order to estimate the optical band gap. The obtained band gaps of the present work reveal that polymer hybrids with sufficient film-forming capability could be useful to overcome the drawbacks associated with conjugated polymers. Based on the XRD results and band gap values, the structure-property relationships were discussed in detail.

“Smart” Antimicrobial Nanocomplexes with Potential to Decrease Surgical Site Infections (SSI)

“…Obviously, only the hump from 2θ = 59 • to 2θ = 67 • can be observed. Other researchers observed such humps for organometallic materials [80]. Therefore, XRD analysis results authenticate that reaction takes place between the PI polymer and the synthesized organosilver material.…”

The Study of EDLC Device with High Electrochemical Performance Fabricated from Proton Ion Conducting PVA-Based Polymer Composite Electrolytes Plasticized with Glycerol

“…To overcome these issues, the addition of Cd(II)–complex and Gly to the PE were attempted to improve the structure of amorphous PE and σ DC . The nature of amorphous PE in the electrolyte system was expanded with the insertion of metal complexes and Gly [ 14 , 17 ]. The Gly incorporation into the system of polymer and salt assists salt dissociation, which consequently reduces the salt recrystallization occurrence.…”

“…Previous study indicated that the XRD pattern of the Cu(II)-complex is almost amorphous, therefore, crystalline peaks were not detected within the entire 2θ degrees. Noticeably, a hump only was observed from 2θ = 20° to 30° [ 14 ]. XRD analysis results confirm that complexation takes place between the PVA and electrolyte components.…”

“…The detailed procedure of synthesis of Cd(II)-complex is the same as that described in the previous report in Materials and Methods section in ref. [ 14 ]. Afterward, the solutions were merged and stirred to guarantee the proper dispersion of Cd(II)-complex in the solution.…”

“…The inclusion of cadmium(II)-complex (Cd(II)-complex) to the PE was attempted to improve the σ DC and amorphous phase. In our previous report, it was observed that insertion of Cu(II)–complex to PVA expanded the amorphous structure [ 14 ].It is well reported that amorphous phase is crucial for ion transport mechanism. The interaction between Cu(II)-complex and the PVA host matrix enrich the amorphous region, which in turn rise the conductivity of the polymer [ 14 ].…”