以兰炭末为原料,Fe(NO3)3为催化剂,采用Fe(NO3)3-水蒸气催化活化法制备了兰炭基活性炭(semi-cokebasedactivatedcarbon,SAC),并将其应用于焦化废水的吸附研究。考察了催化剂溶液浓度(0mol/L,0.4mol/L,0.6mol/L,0.8mol/L,1mol/L)和活化温度(600℃,700℃,800℃,900℃)对样品收率、孔隙结构和吸附性能的影响。使用最优活化条件下制备的兰炭基活性炭作为吸附剂,讨论了不同温度(298K,308K,318K)、SAC投加量(1g,2g,3g,4g,5g)、吸附时间(10min,30min,60min,90min,120min,150min,180min)、转速(0r/min,100r/min,200r/min)对焦化废水COD去除效果的影响。研究表明:当Fe(NO3)3浓度为0.6mol/L,活化温度为800℃,制备的Fe-0.6-800具有中孔-微孔分级多孔结构,其产率为69.21%、比表面积为587.21m2/g、总孔体积为0.383m3/g,亚甲基蓝吸附值达到最高(261.64mg/g);在50mL焦化废水中,Fe-0.6-800投加量为4g,温度为318K,转速为100r/min,吸附时间为120min的最佳工艺条件下,焦化废水COD的去除率最高可达91.12%;该吸附过程同时受物理吸附和化学吸附作用,符合准二级动力学模型,最大理论吸附值为60.82mg/g,且吸附反应的自发性随温度升高而增加。

Semi-coke based activated carbon (SAC) was prepared using semi-coke powder as the raw material and Fe(NO3)3 as the catalyst through the Fe(NO3)2-steam activation meth-od. The SAC was than applied for the adsorption of coking wastewater. The effects of Fe(NO3)3 concentration (0 mol/L,0.4 mol/L,0.6 mol/L,0.8 mol/L,1.0 mol/L) and activation tempera-ture (600 ℃,700 ℃,800 ℃,900 ℃) on yield, pore structure and adsorption performance of the sample were investigated. The prepared SAC under the optimal activation conditions was used as the adsorbent to study the influences of different temperatures (298 K,308 K,318 K), SAC dos-age (1 g,2 g,3 g,4 g,5 g), adsorption time (10 min,30 min,60 min,90 min,120 min,150 min,180 min), and rotational speed on the removal efficiency of chemical oxygen demand (COD) in coking wastewater. The results show that when the Fe(NO3)3 concentration is 0.6 mol/L and the activation temperature is 800 ℃, the prepared Fe-0.6-800 sample exhibits a mesoporous-mi-cropore hierarchical porous structure with a yield of 69.21%, a specific surface area of 587.21 m2/g, a total pore volume of 0.383 m3/g, and methylene blue adsorption value reaches the highest (261.64 mg/g). When the dosage of Fe-0.6-800 sample is 4 g, the adsorption temperature is 318 K, the rotational speed is 100 r/min, and the adsorption time is 120 min, the removal rate of COD in 50 mL coking wastewater can up to 91.12%. The adsorption process involves both physi-cal and chemical mechanism, followed the pseudo-second-order kinetic model. The maximum theoretical adsorption capacity is about 60.82 mg/g, and the spontaneity of the adsorption reac-tion increases with raising temperature.