Golbabaei Farideh, Ebrahimi Ali, Shirkhanloo Hamid, Koohpaei Alireza, Faghihi-Zarandi Ali
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Glob J Health Sci. 2015 Dec 18;8(7):273-80. doi: 10.5539/gjhs.v8n7p273.
Based on the noticeable toxicity and numerous application of mercury in industries, removal of mercury vapor through sorbent is an important environmental challenge.
Due to their highly porous and hollow structure, large specific surface area, light mass density and strong interaction, Single-Walled Carbon Nanotubes (SWCNTs) sorbent were selected for this investigation.
In this study, instrumental conditions, method procedure and different effective parameters such as adsorption efficiency, desorption capacity, time, temperature and repeatability as well as retention time of adsorbed mercury were studied and optimized. Also, mercury vapor was determined by cold vapor atomic absorption spectrometry (CV-AAS).Obtained data were analyzed by Independent T- test, Multivariate linear regression and one way-ANOVA finally.
For 80 mg nanotubes, working range of SWCNT were achieved 0.02-0.7 mg with linear range (R2=0.994).Our data revealed that maximum absorption capacity was 0.5 mg g-1 as well as limit of detection (LOD) for studied sorbent was 0.006 mg. Also, optimum time and temperature were reported, 10 min and 250 °C respectively. Retention time of mercury on CNTs for three weeks was over 90%. Results of repeated trials indicated that the CNTs had long life, so that after 30 cycles of experiments, efficiency was determined without performance loss.
Results showed that carbon nanotubes have high potential for efficient extraction of mercury from air and can be used for occupational and environmental purposes. The study of adsorption properties of CNTs is recommended.
鉴于汞在工业中的显著毒性及其广泛应用，通过吸附剂去除汞蒸气是一项重要的环境挑战。
由于单壁碳纳米管（SWCNTs）具有高度多孔的中空结构、大比表面积、轻质密度和强相互作用，因此选择其作为吸附剂进行本研究。
本研究对仪器条件、方法步骤以及不同有效参数进行了研究和优化，这些参数包括吸附效率、解吸容量、时间、温度、重复性以及吸附汞的保留时间。此外，采用冷蒸气原子吸收光谱法（CV-AAS）测定汞蒸气。最终，通过独立样本t检验、多元线性回归和单因素方差分析对所得数据进行分析。
对于80mg纳米管，SWCNT的工作范围为0.02 - 0.7mg，线性范围（R2 = 0.994）。我们的数据显示，最大吸附容量为0.5mg g-1，所研究吸附剂的检测限（LOD）为0.006mg。此外，还报告了最佳时间和温度分别为10分钟和250°C。汞在碳纳米管上三周的保留时间超过90%。重复试验结果表明，碳纳米管具有长寿命，在30次实验循环后，效率测定无性能损失。
结果表明，碳纳米管在从空气中高效提取汞方面具有很高的潜力，可用于职业和环境目的。建议对碳纳米管的吸附特性进行研究。
