毛竹纤维束活性炭的制备及其对苯酚的吸附OA北大核心CSTPCD

As society progresses,environmental pollution issue has increasingly garnered attention.Phenol is a highly toxic pollutant,commonly found in industrial wastewater from petroleum,paint,paper,polymer and pharmaceutical industries.It is poorly biodegradable and highly toxic to the environment and the human body.Therefore,it is crucial to develop activated carbon with superior adsorption capabilities to enhance water quality.In this study,bamboo fiber bundles separated after high-temperature saturated steam treatment were used as raw materials.These bamboo fiber bundles were carbonized and then activated with sodium hydroxide to prepare bamboo fiber activated carbon(BFAC).The effects of carbonization time(0.50-1.50 h),carbonization temperature(300-400 ℃),and bamboo alkali ratio(1∶1.0-1∶4.0)on the performance of bamboo fiber bundles were investigated with activation at 800 ℃ for 1 h.Specific surface area and pore size were analyzed using a scanning electron microscope,energy dispersive spectrometer,and Fourier transform infrared spectroscopy to characterize the structure of activated carbon.It was found that the bamboo fiber activated carbon with more than 87％of microspores could be obtained after optimizing the carbonization time and temperature.The specific surface area of bamboo fiber bundle activated carbon peaked at 0.75 h of carbonization time and 350 ℃ of carbonization temperature,showing a trend of initially increasing and then decreasing.The specific surface area increased with the addition of alkali within the range studied.The results showed that the highest specific surface area of activated carbon BFAC-TC-4 could be obtained after 0.75 h of carbonization at 350 ℃ and 1 h of activation at 800 ℃ with bamboo alkali ratio as 1∶4.0.The Brunauer-Emmett-Teller(BET)specific surface area reached 2 817.00 m2/g,with the total pore volume of 1.615 7 mL/g and the microporosity of 94.89％.Additionally,the high specific surface area and the high percentage of micropores resulted in an iodine adsorption value of 2 769.88 mg/g.The prepared bamboo fiber bundle activated carbon was able to remove phenol from water rapidly,and the adsorption process could be completed within 10 min as shown by the adsorption kinetic model.The maximum adsorption capacity of BFAC-TC-4 activated carbon was up to 297 mg/g at room temperature with a phenol concentration of 200 mg/L and a solid-liquid ratio of 3∶10.This was attributed to its high specific surface area and high micropore occupancy.The adsorption of phenol by BFAC-TC-4 was in accordance with the proposed two-stage kinetic model,and its adsorption of phenol was mainly influenced by chemisorption.