การเตรียมถ่านดูดซับจากเปลือกผลของยางพารา โดยต้มสารละลายกรดซัลฟิวริกสำหรับดูดซับก๊าซไนโตรเจน / ปฐมาภรณ์ เศวตจินดากร = Preparation of carbon adsorbents from rubber pod shells boiled in sulfuric acid solution for oxygen and nitrogen adsorption / Pathamaporn Sawetjindakorn
Carbon adsorbents were prepared from rubber pod shells by boiling in sulfuric acid solution of 70% w/w at 200 degree celcius. A whole shell was converted to carbon after boiling for one and a half hour. However, the adsorbents had BET surface area of 7.34 squaremeter per gram and they adsorbed iodine about 360-380 mg/g. Adsorption of nitrogen and oxygen were investigated at 31, 0, -13 degee celcius. All isotherms for nitrogen and oxygen obeyed Henry's equation. The Henry's constants were 0.00017, 0.00067, 0.00105 mmol/(g kPa) for nitrogen and 0.00020, 0.00083, 0.00109 mmol/(g kPa) for oxygen at 31, 0, -13 degree celcius respectively.
