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In this study, a highly thermally stable benzimidazole based covalent organic framework (bCOF) was synthesized by the reaction of perlin‐tetracarboxylic anhydride, 5‐aminoisophthalic acid and diaminobenzidine in polyphosphoric acid medium. The synthesized porous bCOF was identified by different techniques. From CO2 adsorption, the micropore surface area of the bCOF was found to be 856 m2 g−1; this synthesized bCOF has a widespread netting construction, and it has various porosity. The TGA results displayed the high thermal strength of the synthesized bCOF. After characterization, the bCOF was used for the removal of methylene blue from aqueous solution, and the essential parameters such as pH of the solution, contact time and initial concentration were assessed. The maximum adsorption capacity of the bCOF for removal of methylene blue was 63.29 mg g−1 after only 40 min contact time at a pH of 6. Two kinetics and adsorption models were used for interpretation, and the outcomes showed that the pseudo‐second‐order and Langmuir models respectively were better fitted to the results. According to the results, the novel bCOF can be applied to remove methylene blue from aqueous solution. © 2020 Society of Chemical Industry

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In this study, the effect of magnetic adsorbent prepared from Olive kernel (MA-OK) was studied in the Amoxicillin (AMX) removal. The synthesized adsorbent, under a sonochemical method, were characterized using Field emission scanning electron microscope (FESEM), Fourier transform infrared spectroscopy (FTIR), Brunauer-Emmett-Teller (BET) and X-ray diffraction (XRD). The absorption functions in the batch experiments were studied using the expected parameters for the maximum absorption capacities (q) such as pH, contact time, the dosage adsorbent, and the initial concentration of AMX. The residual amount of AMX were recorded after injection into the HPLC. The proportion of the mobile phase was methanol to water (40:60) at a flow rate of 1 ml/min. Adsorption experimental results indicated that the removal efficiency reaches its maximum using 0.5 g/L of the adsorbent, concentration of AMX (200 mg/L) at contact time of 90 min and pH of 6. The kinetics of the reaction and the adsorption isotherm could be well described by the pseudo-second order equation and the Langmuir adsorption isotherm with a regression coefficient of 0.9981 and 0.9979, respectively. The maximum adsorption capacity obtained from the Langmuir model was to be 238.1 mg/g. The ionic strength of the solution has no significant effect on increasing the AMX removal efficiency. Eventually, application of this adsorbent was successfully performed for removing AMX from aqueous and hospital wastewater solutions.

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