文章摘要
蒋子旸,徐敏,伍钧.高铁酸钾/高锰酸钾改性生物炭对Cd2+的吸附研究[J].农业环境科学学报,2021,40(4):876-883.
高铁酸钾/高锰酸钾改性生物炭对Cd2+的吸附研究
Adsorption of Cd2+ by potassium ferrate/potassium permanganate-modified vinasse biochar
投稿时间:2020-09-24  
DOI:10.11654/jaes.2020-1123
中文关键词: 酒糟生物炭  高铁酸钾  高锰酸钾  改性  Cd2+  吸附
英文关键词: vinasse biochar  K2FeO4  KMnO4  modification  Cd2+  adsorption
基金项目:四川省科技支撑计划项目(2015SZ0007,2016NZ0039)
作者单位E-mail
蒋子旸 四川农业大学环境学院, 成都 611130  
徐敏 四川农业大学环境学院, 成都 611130  
伍钧 四川农业大学环境学院, 成都 611130 wuj1962@163.com 
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中文摘要:
      为增强生物炭对Cd的吸附性能,以600℃制备的酒糟生物炭(BC)为原料,采用K2FeO4和KMnO4氧化活化的方式制备改性生物炭,分别标记为BCFE和BCMN,采用全自动比表面积和孔隙度分析仪(BET)、电子显微镜-能谱仪(SEM-EDS)对改性前后酒糟生物炭的性质进行分析,并探究改性生物炭对Cd2+的吸附效果。结果表明,添加K2FeO4和KMnO4可有效地将Fe和Mn负载到生物炭上,分别在生物炭表面生成铁氧化物与锰氧化物。BCFE的总官能团含量分别是BC和BCMN的1.8倍和1.5倍,BCFE的含氧官能团与芳香性结构更为丰富。K2FeO4和KMnO4改性显著提高了生物炭的比表面积,3种材料比表面积表现为:BCFE(2 302.0m2·g-1)>BCMN(521.3 m2·g-1)>BC(245.9 m2·g-1)(P<0.05),BCFE的比表面积分别是BC和BCMN的9.4倍和4.4倍。吸附试验结果显示,当达到吸附平衡时,3种材料对Cd2+的吸附量大小表现为BCFE(7.46 mg·g-1)>BCMN(5.61 m2·g-1)>BC(1.46 m2·g-1)(P<0.05)。3种生物炭对Cd2+的吸附动力学模型均符合准二级动力学模型,吸附速率由快至慢排序为:BCFE>BCMN>BC;吸附等温模型均符合Langmuir模型,吸附过程为单分子层吸附,最大吸附量(Qm)表现为:BCFE>BCMN>BC。因此,K2FeO4和KMnO4改性处理显著改善了生物炭的结构,提高了对Cd的吸附能力,且K2FeO4改性效果明显优于KMnO4。可见,经K2FeO4改性的生物炭具有较好的吸附潜力,可作为Cd废水处理的有效材料。
英文摘要:
      Vinasse biochar(BC) pyrolyzed at 600℃ was modified by K2FeO4(BCFE) or KMnO4(BCMN). The modified biochar was characterized by BET and SEM-EDS. The results showed that Mn-oxide and Fe-oxide were successfully loaded onto BCMN and BCFE, respectively. The total functional group content of BCFE was 1.8 times and 1.5 times higher than that of BC and BCMN, respectively. BCFE had more oxygen-containing functional groups and conjugated aromatic structures than the other biochars. The order of the specific surface area was BCFE(2 302.0 m2·g-1) >BCMN(521.3 m2·g-1) >BC(245.9 m2·g-1) (P<0.05), with the specific surface area of BCFE being 9.4 times and 4.4 times higher than that of BC and BCMN, respectively. The adsorption capacities of Cd2+ by BC, BCMN, and BCFE were 1.46, 5.61, and 7.46 mg·g-1, respectively, with significant differences among the three biochars(P<0.05). The adsorption kinetics of Cd2+ on BC, BCMN, and BCFE were described by the pseudo-second-order kinetic model. The adsorption rate of Cd by different biochars was in the order of BCFE>BCMN>BC. Isothermal adsorption of Cd2+ by BC, BCMN, and BCFE was described by the Langmuir isotherm, thereby indicating that the adsorption by biochar was single molecular layer adsorption. The order of the maximum adsorption capacity(Qm) was as follows:BCFE>BCMN>BC. The addition of K2FeO4/KMnO4 improved the structure of the biochar and increased the adsorption capacity of Cd, and the adsorption capacity of Cd by BCFE was higher than that of the BCMN. The results demonstrate that BCFE has an effective Cd removal ability from wastewater.
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