Hydroxide modified activated alumina as an adsorbent for CO2 adsorption: Experimental and modeling

Adsorption Isotherms and Kinetics of Lead and Cadmium Ions: Comparative Studies Using Modified Melon (Citrullus colocynthis) Husk

“…However, the husks or chaffs left after threshing the seeds ( Figure 1c) are often considered as waste. Moreover, numerous studies have reported that adsorbent capacity on metal ions could be boosted by treating it with phosphoric acid (H3PO4), sodium hydroxide (NaOH) and urea (CH4N2O) among others [11][12][13]. Hence, it is important to investigate the efficacy of using the modified form of this abundant byproduct of Citrullus colocynthis, in adsorbing Pb 2+ and Cd 2+ in tannery effluents, which have been reported to have high concentrations of the said metals [3].…”

Recent progress in materials development for CO2conversion: issues and challenges

“…Recently, hydroxide modified activated alumina granules have been used for the same and achieved an adsorption capacity of about 146.70 and 130.84 mg g À1 at 20 1C and 6 bar pressure for NaOH and KOH, respectively. 87 Ramaprabhu and co-workers prepared graphene based Fe 3 O 4 nanocomposites having CO 2 adsorption performance of 60, 35, and 24 mmol g À1 at 11 bar pressure at 25, 50, and 100 1C, respectively. 88 Conventional inorganic metal oxides have also been explored as an adsorbent for CO 2 uptake over the years.…”

Effects of potassium hydroxide and aluminum oxide on the performance of a modified solvay process for CO 2 capture: A comparative study

“…However, potassium bicarbonate (undesired) was obtained by adding extra amounts of CO 2 . About 98% of CO 2 capture was reached under a KOH concentration of 53%, a solution flow rate of 60 L/h, and almost a constant temperature between 40 C and 45 C. Mohammad et al 15 analyzed the effect of modified activated alumina with sodium hydroxide (NaOH) and KOH on the CO 2 adsorption efficiency. By using 2.0 g of adsorbent, under optimum conditions (20 C and 6 bar), the results indicated that the highest CO 2 adsorption was 0.147 g/g for KOH (concentration of 30%) in comparison with 0.131 g/g for NaOH (concentration of 30%).…”