当前位置: X-MOL 学术Biomass Convers. Biorefin. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Oxidized eucalyptus charcoal: a renewable biosorbent for removing heavy metals from aqueous solutions
Biomass Conversion and Biorefinery ( IF 4 ) Pub Date : 2021-03-14 , DOI: 10.1007/s13399-021-01431-y
Elias Costa de Souza , Alexandre Santos Pimenta , Alfredo José Ferreira da Silva , Paula Fabiane Pinheiro do Nascimento , Joshua O. Ighalo

In this study, a comparison between charcoal produced from Eucalyptus urograndis modified and unmodified with HNO3 on the adsorption capacity of metals (Cu(II), Cd(II), and Ni(II)) in aqueous solutions was performed. The modification was performed using charcoal from the wood of a hybrid of Eucalyptus urophylla x Eucalyptus grandis (commonly referred to in Brazil as Eucalyptus urograndis). The charcoal was produced at a final temperature of 450 °C. Nitric acid was the oxidizing agent, employed at a concentration of 12.5% (v/v) and a reaction time of 3 h. The materials were characterized and compared using thermogravimetric analysis, thermogravimetric index, specific surface area analysis, scanning electron microscopy, elemental analysis, and point of zero charge. Studies of the process factors (contact time, mass, ideal pH), adsorption isotherms (Langmuir and Freundlich), and the thermodynamics of the process were also carried out. Treatment with nitric acid altered the elemental composition of charcoal, and functional groups, like carbonyl groups, were added to the surface, which caused a significant increase in total adsorption capacity (from 114.27 to 310.53 mg g−1 in a solution with a mix of metals). The model that best fit the data was Langmuir, and the maximum removal of Cu(II) ions was 96%, and occurred at pH 5, at 318 K, with a dose of biosorbent equal to 0.4 g 50 mL−1 of solution and equilibrium contact time of 30 min. Thermodynamic parameters suggested that adsorption occurred spontaneously and occurred through the ion exchange and electrostatic interaction mechanisms. In systems with the presence of more than one metal ion, the total adsorption capacity increased.

Graphical abstract



中文翻译:

氧化桉木炭:一种可再生的生物吸附剂,用于去除水溶液中的重金属

在这项研究中,比较了用HNO 3改性和未改性的尾叶桉木生产的木炭对水溶液中金属(Cu(II),Cd(II)和Ni(II))的吸附能力。使用木炭从混合的木材进行了修改尾叶桉X巨桉(通常称为巴西如桉树urograndis)。木炭的最终温度为450°C。硝酸是氧化剂,浓度为12.5%(v / v),反应时间为3小时。使用热重分析,热重指数,比表面积分析,扫描电子显微镜,元素分析和零电荷点对材料进行表征和比较。还研究了工艺因素(接触时间,质量,理想pH),吸附等温线(Langmuir和Freundlich)以及工艺的热力学。用硝酸处理会改变木炭的元素组成,并向表面添加官能团(如羰基),从而导致总吸附量显着增加(从114.27到310.53 mg g -1在混合金属的溶液中)。最适合该数据的模型是Langmuir,Cu(II)离子的最大去除率为96%,发生在pH 5、318 K下,生物吸附剂的剂量等于0.4 g 50 mL -1的溶液和平衡接触时间为30分钟。热力学参数表明吸附是自发发生的,并通过离子交换和静电相互作用机理发生。在存在一种以上金属离子的系统中,总吸附容量增加。

图形概要

更新日期:2021-03-15
down
wechat
bug