Film-pore diffusion modeling for sorption of azo dye on to exfoliated graphitic nanoplatelets
Film-pore diffusion modeling for sorption of azo dye on to exfoliated graphitic nanoplatelets
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剥离石墨纳米片吸附偶氮染料的膜孔扩散模型
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
S. Karthikeyan
中科院分区：
文献类型：
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作者：
T. Maiyalagan;S. Karthikeyan
剥离的石墨化纳米颗粒(XGNP)被用作有毒纺织品染料酸性橙7(酸性染料)的潜在吸附剂。研究了影响该工艺效率的主要变量，如温度、初始染料浓度和pH值。用动力学方法测定了比速率常数，证实了准一级速率表达式的适用性。通过动力学测量，得到了吸附过程中可能存在的机理。为了确定正在进行的过程是颗粒扩散还是薄膜扩散，采用了Boyd和Reichenberg给出的处理方法。结合染料种类和表面性质，从静电相互作用的角度解释了不同因素对酸性橙7从溶液中吸附的影响。所开发的酸性染料脱除系统具有实用、经济、快速、重复性好等特点。
Exfoliated graphitic nanoplatelets (xGnPs) have been utilized as a potential adsorbent for toxic textile dye Acid Orange 7 (acid dye). The effects of major variables governing the efficiency of the process, such as temperature, initial dye concentration and pH are studied. The kinetic measurements have been used for determining the specific rate constant, confirming the applicability of pseudo first-order rate expression. Plausible mechanism of ongoing adsorption process involved is obtained by carrying out kinetic measurements. To identify whether the ongoing process is particle diffusion or film diffusion, the treatments given by Boyd and Reichenberg have been employed. The influence of different factors on the adsorption of Acid Orange 7 from solution is explained in terms of electrostatic interaction by considering the dye species and the surface character of the xGnPs. The developed system for the removal of acid dye is found to be very useful, economic, rapid and reproducible.