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The increment amount of the CO2 emission by years has become a major concern worldwide due to the global warming issue. However, the influence modification of activated carbon (AC) has given a huge revolution in CO2 adsorption capture compare to the unmodified AC. In the present study, the Deep Eutectic Solvent (DES) modified surface AC was used for Carbon Dioxide (CO2) capture in the fixed-bed column. The AC underwent pre-carbonization and carbonization processes at 519.8 °C, respectively, with flowing of CO2 gas and then followed by impregnation with 53.75% phosphoric acid (H3PO4) at 1:2 precursor-to-activant ratios. The prepared AC known as sea mango activated carbon (SMAC) was impregnated with DES at 1:2 solid-to-liquid ratio. The DES is composing of choline chloride and urea with ratio 1:2 choline chloride to urea. The optimum adsorption capacity of SMAC was 33.46 mgco2/gsol and 39.40 mgco2/gsol for DES modified AC (DESAC).

The presence of phenols and phenolic compounds in water and wastewater has gained great public attention and it is one of the most frequent pollutants in wastewater. In this study, the adsorption of 4-Nitrophenol from wastewater using activated carbon prepared from the non-edible Sea Mango (Cerbera odollam) fruit was investigated. The Sea Mango Activated Carbon (SMAC) was prepared through a physicochemical activation which consists of H3PO4 impregnation and followed by CO2 gasification. The influences of process variables represented by solution pH value, contact time, initial concentration and adsorbent dosage on removal efficiency of 4-NP onto Sea Mango Raw Material (SMRM) and Sea Mango Activated Carbon (SMAC) were studied. Result showed that the optimum pH for 4-NP removal was at pH 3. The dosage usage required to complete 100 ml of 4-NP on SMRM and SMAC was 1.0 g. Batch studies were performed to evaluate the adsorption process, and it was found that the Freundlich isotherm effectively fits the experimental data for the adsorbates better than the Langmuir model with the highest adsorption capacity 158.730 mg/g of 4-nitrophenol on SMAC. It was found that 70.49% and 97.98% of 4-NP was adsorbed onto SMRM and SMAC, respectively, at an initial concentration of 20 mg/L.