Chemical pretreatment of Lagenaria breviflora seeds used as biosorbents for the removal of aqueous-bound Ni2+

IF 1.6 Q3 WATER RESOURCES
Hillary Onyeka Abugu, Samson Ifeanyi Eze, Arinze Longinus Ezugwu, Ibeabuchi Jude Ali, Janefrances Ngozi Ihedioha
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Abstract

Abstract Lagenaria breviflora (LB) seeds were modified with acid (AMLB) and base (BMLB) for the sorption of Ni2+ from an aqueous solution. It was characterized by Fourier transformation infrared spectroscopy (FTIR), scanning electron microscope (SEM), X-ray diffraction (XRD), thermogravimetric analyzer (TGA), and Brunauer–Emmett–Teller (BET). Kinetic, isotherm thermodynamic, and effects of pH were also studied. The FTIR revealed a shift and formation of new functional groups on the pretreated biosorbent surface which could be attributed to the adsorption of Ni2+ onto the modified LB. SEM analysis under different magnifications revealed that the external surface of the modified LB exhibited several cracked surfaces and different pore structures which could be involved in the adsorption of Ni2+. The XRD showed an amorphous structure, while the BET revealed a large surface area (BMLB-360.430 and AMLB-322.965 m2/g). The experimental conditions – contact time, pH, and initial metal ion concentration indicated that the maximum adsorption was attained at 30 min at pH 6, while the adsorption efficiency increased as the concentration of the biosorbents increased. Kinetic studies indicated that the sorption process correlates with the pseudo-second-order kinetic model suggesting a chemosorption mechanism. The isotherm data obtained obeyed a Langmuir model suggesting monolayer adsorption of Ni2+. The calculated sorption thermodynamic factors showed the adsorption of Ni2+ to be exothermic and spontaneous.
化学预处理短花菇种子作为生物吸附剂去除水中Ni2+
摘要采用酸(AMLB)和碱(BMLB)对短花蕾草(Lagenaria breviflora, LB)种子进行修饰,使其吸附Ni2+。采用傅里叶变换红外光谱(FTIR)、扫描电镜(SEM)、x射线衍射(XRD)、热重分析仪(TGA)和布鲁诺尔-埃米特-泰勒(BET)对其进行了表征。研究了动力学、等温热力学和pH的影响。FTIR分析表明,改性LB吸附了Ni2+,并在改性LB表面形成了新的官能团。不同放大率下的SEM分析表明,改性LB的外表面出现了多个裂纹表面和不同的孔结构,可能参与了Ni2+的吸附。XRD显示为非晶结构,BET显示出较大的比表面积(BMLB-360.430和AMLB-322.965 m2/g)。实验条件-接触时间、pH和初始金属离子浓度表明,在pH为6的条件下,吸附时间为30 min时达到最大,吸附效率随生物吸附剂浓度的增加而增加。动力学研究表明,吸附过程符合准二级动力学模型,表明吸附机理为化学吸附。所得等温线数据符合Langmuir模型,表明Ni2+是单层吸附的。计算的吸附热力学因子表明,Ni2+的吸附是自发的、放热的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
2.30
自引率
6.20%
发文量
136
审稿时长
14 weeks
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