Amine-mesoporous silica has been considered as a promising CO2 adsorbent with high potential for the reduction of energy consumption and CO2 capture cost; however, its stability could greatly vary with synthetic method. In this study, adsorbents prepared by impregnating different amines including polyethylenimine (PEI) and 3-aminopropyltriethoxysilane (APTES) onto mesoporous silica were used to evaluate the effect of amines selection on the stability of adsorbents used in CO2 capture process. Results revealed that APTES impregnated mesoporous silica (APTES-MPS) is more stable than PEI-impregnated mesoporous silica (PEI-MPS); APTES-MPS was thermally decomposed at ≈280 oC, while PEI-MPS was thermally decomposed at ≈180 oC only. PEI-MPS was particularly less stable when operating under dry condition; its CO2 adsorption capacity reduced by 22.1% after 10 adsorption/regeneration cycles, however, the capacity can be significantly improved in humid condition. APTES-MPS showed a greater stability with no significant reduction in CO2 capture capacity after 10 adsorption/regeneration cycles. In general, APTES-MPS adsorbent possesses a higher stability compared to PEI-MPS thanks to the formation of chemical bonds between amino-functional groups and mesoporous silica substrate. Keywords: Mesoporous silica; CO2 capture; Adsorption; Regeneration; Emission.
In this study, phenol was adsorbed by commercial coconut shell charcoal (CSC), which is inexpensive, commercially available, non-toxic, and environmentally friendly. The measurements, namely the density functional theory (DFT) calculation, the energy-dispersive X-ray spectroscopy (EDS), and the Fourier-transform infrared spectroscopy (FTIR), were conducted to characterize the features of the CSC. The highest phenol removal efficiency reached 78.62% at optimal conditions (pH: 7, initial concentration of phenol: 20 mg/L, adsorption time: 120 minutes, and dosage of CSC: 2.5 g/L). The phenol adsorption process follows the Langmuir adsorption model with the coefficient R2 = 0.9964. The maximum adsorption capacity by the CSC was determined to be 14.32 mg/g. The process of desorption of phenol from CSC was most effective in the NaOH solution. On the other hand, the adsorption efficiency of CSC gradually decreased after five consecutive cycles. At the fifth use, the phenol uptake efficiency reached 22.2%.
Mục tiêu: Nhận xét đặc điểm lâm sàng, XQ và đánh giá kết quả điều trị phẫu thuật gãy liên mấu chuyển (LMC) xương đùi ở người cao tuổi có sử dụng màn tăng sáng tại Bệnh viện Đa khoa tỉnh Thái Bình. Phương pháp nghiên cứu: mô tả tiến cứu không đối chứng. Kết quả: 67 bệnh nhân nghiên cứu với tuổi trung bình là 73,76±5,25. Liền vết mổ kỳ đầu: 67/67 bệnh nhân (100%). Kết quả nắn chỉnh: Xương được nắn về đúng vị trí giải phẫu, góc cổ thân 1250-1300 có 50/67 BN (74,62%). Từ 1200 - <1250 có 12/67 BN (17,91%), từ 1100 - < 1200 có 5 BN (7,47%). Kết quả xa theo tiêu chuẩn của Nguyễn Trung Sinh của chúng tôi tốt và rất tốt chiếm 88.05%, tỉ lệ đạt trung bình là 11,95% và không gặp bệnh nhân nào có kết quả xấu.
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