改性山竹壳炭对废水中Ni(Ⅱ)的吸附效果与机理研究  

Study on the adsorption effect and mechanism of modified mangosteen charcoal on Ni(Ⅱ)in wastewater

作　　者：单锐[1,2] 谈莉 陈凤鸣 李汇春 王亚琢 SHAN Rui;TAN Li;CHEN Feng-ming;LI Hui-chun;WANG Ya-zhuo(Guangzhou Institute of Energy Conversion,Chinese Academy of Sciences,Guangzhou 510640,China;Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou),Guangzhou 511458,China;Shandong HI-SPEED Co.,Ltd.,Jinan 250014,China;Foshan Kehengbo Environmental Protection Technology Co.,Ltd.,Foshan 528225,Guangdong,China)

机构地区：[1]中国科学院广州能源研究所,广州510640 [2]南方海洋科学与工程广东省实验室(广州),广州5114584 [3]山东高速股份有限公司,济南250014 [4]佛山市科恒博环保技术有限公司,广东佛山528225

出　　处：《安全与环境学报》2022年第6期3473-3483,共11页Journal of Safety and Environment

基　　金：国家重点研发项目(2020YFC1908903);国家自然科学基金项目(51776211)。

摘　　要：选用山竹壳为原料,在100~500℃条件下慢速热解和KOH、K2 FeO4改性制得改性山竹壳生物炭,用于水中Ni(Ⅱ)的吸附和机理研究。XPS、FTIR、BET等表征手段表明:改性后的山竹壳生物炭表面出现了丰富的孔状结构,比表面积高达13.1 m^(2)/g,有利于对Ni(Ⅱ)的吸收。—OH、C—C、C=O、C—O等官能团含量显著改变,促进了离子交换过程,有利于生物炭对重金属的吸附。改性后的山竹壳生物炭对Ni(Ⅱ)的吸附量从9.71 mg/g显著上升至75.91 mg/g。吸附量的上升可能是由于Ni(Ⅱ)与改性生物炭表面的金属阳离子发生了离子交换,部分Ni(Ⅱ)与改性山竹壳炭表面的—OH、—COOH等官能团发生了反应,并以络合物或沉淀的形式存在。改性生物炭吸附Ni(Ⅱ)的动力学符合拟二级动力学方程,该吸附过程主要以化学吸附为主。同时,改性生物炭在六次吸附脱附循环试验后对Ni(Ⅱ)的吸附量仍高达19.18 mg/g,与其他生物炭吸附量对比,证明了该改性山竹壳炭具有良好的重复使用性能。改性山竹壳生物炭炭被认为是一种有效处理废水中Ni(Ⅱ)的吸附剂,该改性以及生物炭的制备方法为后续水中污染物吸附提供了新的见解和方向。In this study,mangosteen shell was used as the raw material for preparing biochar.The modified mangosteen shell biochar was prepared by slow pyrolysis at 100500℃and KOH and K2 FeO4 modification,which was used for the adsorption and mechanism study of Ni(Ⅱ)in water.Characterization methods such as XPS,FTIR,and BET show that the modified mangosteen shell biochar has a rich porous structure on the surface,the specific surface area is as high as 13.1 m^(2)/g,which is conducive to the absorption of Ni(Ⅱ).The content of functional groups such as—OH,C—C,C=O,C—O,etc.is significantly changed,which promotes the ion exchange process and is beneficial to the adsorption of heavy metals by biochar.The modified mangosteen shell biochar has a significant increase in the adsorption capacity of Ni(Ⅱ),and the adsorption capacity is 75.91 mg/g(9.71 mg/g for unmodified biochar),which is probably due to some replaceable metal cations undergoing ion exchange.Part of Ni(Ⅱ)reacted with—OH and—COOH on the surface of modified mangosteen char,and existed in biochar in the form of complex or precipitate.The adsorption process of Ni(Ⅱ)by biochar is more in line with the pseudo-second-order kinetic equation,indicating that the adsorption of Ni(Ⅱ)by the two kinds of biochar is mainly chemical adsorption.Meanwhile,the adsorption capacity of Ni(Ⅱ)by the modified biochar after six adsorption-desorption cycles is still as high as 19.18 mg/g.Compared with the adsorption capacity of other biochar,it proves that the modified mangosteen char has good repeated use performance.The modified mangosteen biochar is regarded as an effective adsorbent for treating Ni(Ⅱ)in wastewater,and the modification method and the preparation of biochar provide new insights and directions for the subsequent adsorption of pollutants in water.

关 键 词：环境工程学 水体污染 Ni(Ⅱ) 吸附 生物炭 山竹壳 重金属 

分 类 号：X522[环境科学与工程—环境工程]