In this work, we have developed a novel method for preparing a CoOx/GO catalyst supported on ITO glass by electrochemical post-treatment of redox-active infinite coordination polymer (ICP) {Co(3,5-dbsq)(3,5-dbcat)(bix)} nanoparticles. Firstly, highly dispersed CoOx nanoparticles with ultra-small size and narrow size distribution (1.42 ± 0.34 nm) were in situ synthesized on ITO glass after electrochemical polarization of ICP coated on ITO glass at −1.1 V for 16.7 min (1000 s) in 0.10 mol L−1 KCl. Graphene oxide (GO) was next mixed with the ICP to obtain the CoOx/GO catalyst supported on ITO glass (the size of CoOx nanoparticles ranged within 1.21 ± 0.28 nm), which proved to have improved catalytic performance and enhanced stability compared to the pure CoOx. The catalytic activity of this CoOx/GO catalyst was then optimized according to the degradation efficiency of methylene blue (MB) via an advanced oxidation process in the presence of peroxymonosulfate (PMS). Under the optimal conditions here, the enhanced catalytic oxidative degradation of dye solution could be achieved easily. 100% of MB (2.0 mL, 20 mg L−1) could be decomposed within 6.7 min, which is better than other CoOx catalysts. With this kind of ITO glass as a component part, a portable reactor was constructed for the first time. Real-time monitoring of the catalytic degradation of colored wastewater from the textile and cosmetic industries was then achieved using this reactor directly by incorporating a UV/vis spectrometer, which is of great importance for information analysis and process control optimization during industrial wastewater treatment.
In this study, novel magnetic infinite coordination polymer Fe 3 O 4 @Tb/AMP core-shell nanoparticles were rationally designed and fabricated as recyclable adsorbents for selective removal of anionic dyes from colored wastewater. The core-shell nanoparticles used in this study are composed of two components: the shell is the supramolecular infinite coordination polymers (ICPs) network formed by terbium ions (Tb 3+ ) and adenosine 5 ′ -monophosphate monohydrate (AMP) ligands and the core is the Fe 3 O 4 nanoparticles which are encapsulated into the ICP network by the self-adaptive inclusion process. The prepared core-shell nanoparticles showed superiority in strong magnetism and selective adsorption towards anionic dyes, such as Alizarin Red (AR) and Congo Red (CR). Parameters that influenced the adsorption process, such as solution pH, salt concentration and adsorbent dosage were investigated. Under the optimal conditions, adsorption kinetics, isotherms and thermodynamics were also determined. Notably, this nano-adsorbent exhibited rapid adsorption feature (almost 96% dye removal in 5 min) and the adsorption isotherm data fitted quite well with the Langmuir model with an estimated maximum adsorption capacity of 357.14 mg g −1 for AR and 909.09 mg g −1 for CR at 298 K. This capacity could be further enhanced at the higher temperatures. In addition, the Fe 3 O 4 @Tb/AMP core-shell nanoparticles could be regenerated by a simple salt/ethanol-washing method and used with high recyclability over five cycles. With the magnetically separable Fe 3 O 4 @Tb/AMP core-shell nanoparticles as adsorbents, selective removal of toxic anionic dyes from colored wastewater could be realized directly, which is of great importance for the sustainable development of dye contaminated wastewater treatment technology.
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