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In this work, an inexpensive and commercially available bentonite was modified by sulfuric acid and explored as the new type of support to immobilize tetraethylenepentamine (TEPA) for CO 2 capture from flue gas. By applying sulfuric acid treatment, the textural properties, in particular, pore volume and surface area of bentonite, were significantly improved. Bentonite treated with 6 M sulfuric acid (Ben_H 2 SO 4 _6M) can reach a pore volume of 0.77 cc/g from that of the parent bentonite of 0.15 cc/g. With the maximum TEPA loading of 50 wt % onto the Ben_H 2 SO 4 _6M sorbent, the maximum CO 2 breakthrough sorption capacity reached 130 mg of CO 2 /g of sorbent at 75 °C under a dry condition. With an addition of moisture to the simulated flue gas, the CO 2 sorption capacity can be further improved to 190 mg of CO 2 at 18 vol% of moisture addition sorbent due to the bicarbonate formation under a wet condition. The TEPA/Ben_H 2 SO 4 _6M sorbents show a good regenerability and thermal stability below 130 °C. The high CO 2 sorption capacity, positive effect of moisture addition, and low capital cost of the raw bentonite materials imply that TEPA/Ben_H 2 SO 4 _6M could be a promising sorbent for cost-efficient CO 2 capture from flue gas. The sulfuric acid treatment was demonstrated as an effective method for bentonite modification to immobilize TEPA for CO 2 capture.

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