Ionic covalent organic frameworks for Non-Steroidal Anti-Inflammatory drugs (NSAIDs) removal from aqueous Solution: Adsorption performance and mechanism

Guanidine-Based Covalent Organic Frameworks: Cooperation between Cores and Linkers for Chromic Sensing and Efficient CO2 Conversion

“…XPS was used to monitor the protonation and deprotonation processes (Figures and S9). It has been reported that condensation between TG Cl and di- or tricarboxaldehyde led to ionic COFs with protonated guanidinium units and chloride counteranions. − The photoelectron signal of Cl – was not observed for the as-synthesized TG-DMPZ but appeared in the spectrum of the HCl-acidified sample. The results suggest that TG-DMPZ was synthesized as a neutral COF and that acidification led to an ionic one with guanidinium groups.…”

Synthesis and Characterization of a Magnetic Carbon Nanofiber Derived from Bacterial Cellulose for the Removal of Diclofenac from Water

“…Understanding the adsorption mechanism is important for identifying the fundamentals of adsorption and evaluating the commercial applicability of an adsorbent . In this regard, the physicochemical properties and structural features of the adsorbent and the adsorbate have critical roles in the adsorption mechanism .…”

“…Understanding the adsorption mechanism is important for identifying the fundamentals of adsorption and evaluating the commercial applicability of an adsorbent. 66 In this regard, the physicochemical properties and structural features of the adsorbent and the adsorbate have critical roles in the adsorption mechanism. 67 Accordingly, the results obtained from the SEM, Brunauer−Emmett−Teller (BET) analysis, FTIR analysis, pH of point of zero charge (pH pzc ), and pK a values were applied to describe the possible mechanisms of diclofenac adsorption onto the MCF adsorbent.…”

Assessing the Performance of Environmentally Friendly-Produced Zerovalent Iron Nanoparticles to Remove Pharmaceuticals from Water

“…This result is in accordance with the findings of Ghauch et al [36], who studied the performance of nZVI material for the removal of two common antibiotics and reported that low concentrations of NaCl led to high removal efficiencies. On the other hand, Mo et al [79] found that increasing Cl − anion concentrations from 0 to 1 M decreased the removal of DCF and KTP through adsorption in metal-organic frameworks, because the dissociation of Cl − from NaCl addition inhibits the reactions between DCF and KTP with the adsorbents. Zhang et al [80], who studied anionic resins, found that an increase in NaCl concentration leads to a decrease in IBU adsorption into the active sites of the resin, due to competition for ion chlorides with the anions of IBU; Van Tran et al [72], who studied IBU adsorption in hollow mesoporous carbon, found that NaCl has a negative effect because IBU is in a cationic state in pH < pKa and an increase in Na + leads to an antagonistic environment.…”

“…Having an anionic resin may promote targeted compound removal because it further enhances the occurrence of electrostatic interactions as well. For example, Mo et al [79] attributed DCF and KTP adsorption to electrostatic forces between the highly positive charge of the ionic covalent organic frameworks (iCOFs) that led to the attraction of anions to its surface; however, the feasibility of incorporating nZVI in anionic resin should be investigated. It should be noted that only a relatively small number of studies consider the effect of nZVI's supporting material or its modification-especially when nZVI is used as a nanocomposite-on the removal of pollutants, even though this effect can be significant.…”