零价铁改性生物碳材料去除废水中六价铬的研究  

Research on the Removal of Hexavalent Chromium from Wastewaterby Zero-valent Iron Modified Biological Carbon Material

作　　者：刘合印 郭奎 陈凡立 彭成法 Liu Heyin;Guo Kui;Chen Fanli;Peng Chengfa(Main Pollutants Control Center of Tengzhou City,Tengzhou 277500,China;The Environmental Monitoring Station of Tengzhou City,Tengzhou 277500,China;Jinan Tianzheng HuanJing Technology Co.,Ltd.,Jinan 250014,China)

机构地区：[1]滕州市主要污染物总量控制中心,山东滕州277500 [2]滕州市环境监测站,山东滕州277500 [3]济南天正环境科技有限公司,山东济南250014

出　　处：《山东化工》2021年第5期262-266,共5页Shandong Chemical Industry

摘　　要：含铬废水由于毒性大,难降解的特点而成为当下水处理技术研究的重点之一。该研究采用生物质为原料制备生物炭,并引入铁基及催化剂合成制备还原性吸附材料,用于处理含Cr(Ⅵ)废水。该研究探索了生物炭的制备,铁基生物炭材料的合成过程。其次研究了铁基生物炭吸附Cr(Ⅵ)的机理,再通过动力学和及pH值对吸附量的影响。结果表明铁基生物炭材料对Cr(Ⅵ)的吸附符合拟二级动力学方程,平衡吸附时间为420 min,最适p H值为3;吸附质在炭材料的表面的分布符合Langmuir模型,其中最大吸附量qm=29.41 mg/g(318.15 K),是生物炭吸附量的6.9倍;是硝酸改性活性炭的5.5倍。这是由于除生物炭的吸附作用外,零价铁对六价铬的还原作用增加了对Cr(Ⅵ)的去除。Chromium-containing wastewater has become one of the focuses of current water treatment technology research due to its high toxicity and difficult degradation characteristics. The research uses biomass as raw materials to prepare biochar,and introduces iron-based and catalyst synthesis to prepare reducing adsorption materials for the treatment of Cr( Ⅵ)-containing wastewater. This research explored the preparation of biochar and the synthesis process of iron-based biochar materials. Secondly,the mechanism of iron-based biochar adsorption of Cr( Ⅵ) is studied,and then the effect of kinetics and p H on the adsorption capacity. The results show that the adsorption of Cr( Ⅵ) by iron-based biochar materials conforms to the pseudo-second-order kinetic equation,the equilibrium adsorption time is 420 min,and the optimum p H is 3;the distribution of adsorbates on the surface of the carbon materials conforms to the Langmuir model,with the largest The adsorption capacity qm= 29.41 mg/g( 318.15 K),which is 6. 9 times the adsorption capacity of biochar and 5. 5 times that of nitric acid modified activated carbon. This is because in addition to the adsorption of biochar,the reduction of hexavalent chromium by zero-valent iron increases the removal of Cr( Ⅵ).

关 键 词：六价铬废水 零价铁改性生物炭 动力学模型 

分 类 号：X705[环境科学与工程—环境工程]