Dalam kajian ini, karbon teraktif diperbuat daripada teh buangan (RT) dengan dua langkah: hidroterma karbonisasi sampel dan seterusnya peresapan (impregnasi) dengan nisbah yang berbeza natrium hidroksida (NaOH): RT pada nisbah 1:1, 2:1 dan 3:1 peratusan berat. Sampel yang diresapkan kemudiannya diaktifkan pada suhu 700 oC selama 90 minit. Karbon teraktif telah disifatkan menggunakan BET, SEM/EDX, dan FTIR. Penjerapan CO2 ke atas karbon teraktif telah dijalankan dalam sistem lapisan tetap bersepadu dengan penganalisis CO2 dalam talian. Kesan peratusan CO2 dalam suapan (10, 20 dan 30%), suhu penjerapan (35, 45 dan 55 oC), kadar aliran suapan (90, 120 dan 150 mL / min) dan jisim 3RT (0.1, 0.2 dan 0.3 g) dalam ruang telah disiasat dalam kajian ini. Kapasiti penjerapan pada lapisan tetap bagi 0.1 g 3RT adalah 386 mg / g diperolehi pada 20% CO2 kepekatan masukan, 90 mL / min aliran suapan pada 35 oC. Penjerapan dipertingkatkan pada sampel 3RT adalah disebabkan oleh kawasan permukaan purata yang lebih besar daripada sampel 2RT dan 1RT. Keputusan mendedahkan bahawa karbon teraktif dari teh buangan boleh digunakan untuk kawalan pencemaran CO2 dalam alam sekitar.
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In this work, activated carbon was prepared from rejected tea (RT) by two steps: hydrothermal carbonization of the sample and subsequently impregnation with different ratios sodium hydroxide (NaOH):RT at 1:1, 2:1 and 3:1 wt%. The impregnated samples were then activated at 700 oC for 90 mins. The activated carbons were characterized using BET, scanning electron microscopy/energy dispersive X-ray, and Fourier transform infrared spectroscopy techniques. The adsorption of CO2 onto prepared activated carbons was carried out in a fixed-bed system integrated to an online CO2 analyzer. The effect of CO2 % in the feed (10, 20 and 30%), adsorption temperature (35, 45 and 55 oC), feed flow rate (90, 120 and 150 mL/min) and mass of 3RT (0.1, 0.2 and 0.3 g) in the column were investigated in this study. The bed adsorption capacity of 0.1 g of 3RT was 386 mg/g obtained at 20% CO2 inlet concentration, 90 mL/min feed flow rate at 35 oC. The enhanced adsorption on 3RT was due to its average surface area which was larger than those of 2RT and 1RT. The results revealed that the prepared activated carbon from rejected tea can be applied for CO2 pollution control in the environment.
Carbon dioxide adsorption on rejected-tea activated carbon in a fixed-bed / Syed Ahmad Syed Yusoff