Fe(NO_(3))_(3)-水蒸气催化活化制备兰炭基活性炭及吸附焦化废水的应用研究  

Preparation of semi-coke based activated carbon by Fe(NO_(3))_(3)-steam catalytic activation for adsorption of coking wastewater

作　　者：蒋绪[1,2] 杨茸茸 吴雷[3] 兰新哲[2] 孟茁越 JIANG Xu;YANG Rongrong;WU Lei;LAN Xinzhe;MENG Zhuoyue(Research Institute of Energy and Chemical Industry,Xianyang Vocational Technical College,712000 Xianyang,China;College of Metallurgical Engineering,Xi’an University of Architecture and Technology,710055 Xi’an,China;School of Chemistry and Chemical Engineering,Xi’an University of Architecture and Technology,710055 Xi’an,China)

机构地区：[1]咸阳职业技术学院能源化工研究所,陕西咸阳712000 [2]西安建筑科技大学冶金工程学院,西安710055 [3]西安建筑科技大学化学与化工学院,西安710055

出　　处：《煤炭转化》2023年第5期73-82,共10页Coal Conversion

基　　金：陕西省重点研发计划项目(2020GY-247);陕西省教育厅科研计划项目(22JK0432);咸阳市重点研发计划项目(2021ZDYF-GY-0045);咸阳职业技术学院科研基金项目(2020KJA03).

摘　　要：以兰炭末为原料,Fe(NO_(3))_(3)为催化剂,采用Fe(NO_(3))_(3)-水蒸气催化活化法制备了兰炭基活性炭(semi-coke based activated carbon,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(0 mol/L,0.4 mol/L,0.6 mol/L,0.8 mol/L,1 mol/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(298 K,308 K,318 K)、SAC投加量(1 g,2 g,3 g,4 g,5 g)、吸附时间(10 min,30 min,60 min,90 min,120 min,150 min,180 min)、转速(0 r/min,100 r/min,200 r/min)对焦化废水COD去除效果的影响。研究表明:当Fe(NO_(3))_(3)浓度为0.6 mol/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587.21 m^(2)/g、总孔体积为0.383 m 3/g,亚甲基蓝吸附值达到最高(261.64 mg/g);在50 mL焦化废水中,Fe-0.6-800投加量为4 g,温度为318 K,转速为100 r/min,吸附时间为120 min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60.82 mg/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(NO_(3))_(3) as the catalyst through the Fe(NO_(3))2-steam activation method.The SAC was than applied for the adsorption of coking wastewater.The effects of Fe(NO_(3))_(3) concentration(0 mol/L,0.4 mol/L,0.6 mol/L,0.8 mol/L,1.0 mol/L)and activation temperature(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 dosage(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(NO_(3))_(3) concentration is 0.6 mol/L and the activation temperature is 800℃,the prepared Fe-0.6-800 sample exhibits a mesoporous-micropore hierarchical porous structure with a yield of 69.21%,a specific surface area of 587.21 m^(2)/g,a total pore volume of 0.383 m 3/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 physical 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 reaction increases with raising temperature.

关 键 词：兰炭 活性炭 吸附应用 焦化废水 催化活化 

分 类 号：TQ424.1[化学工程] X703[环境科学与工程—环境工程]