کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8012458 | 1517159 | 2018 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Adsorption and coadsorption mechanisms of Hg2+ and methyl orange by branched polyethyleneimine modified magnetic straw
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Adsorption and coadsorption of Hg2+ and methyl orange (MO) were accomplished using branched polyethyleneimine modified magnetic straw. The adsorption equilibrium was achieved within 40 mins and the maximal adsorption amounts of Hg2+ and MO reached 320.4 and 510.2â¯mg/g, respectively. Thermodynamic parameters, such as ÎH0 and ÎS0 were found as â3.728â¯kJ/mol and 10.593â¯J/mol K for the adsorption of Hg2+, while ÎH0 and ÎS0 were found to be â2.119â¯kJ/mol and 16.123â¯J/mol K for the adsorption of MO. It was suggested that the adsorptions of Hg2+ and MO were exothermic processes with further increase in the degree of freedom. The respective adsorption mechanism of Hg2+ and MO involved complexation and electrostatic interactions. In the binary system of Hg2+ and MO, the adsorption capacity of MO was not affected by the presence of Hg2+, while the adsorption amount of Hg2+ significantly increased in the presence of MO through the mechanism of bridge enhancement. Specifically, when the initial concentration of Hg2+ was 0.005â¯mol/L, the adsorption amounts of Hg2+ were 510.2 and 1858.3â¯mg/g, respectively in the mono-component and binary systems.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Letters - Volume 229, 15 October 2018, Pages 160-163
Journal: Materials Letters - Volume 229, 15 October 2018, Pages 160-163
نویسندگان
Jingjing Wang, Mengsha Cao, Chenye Jiang, Yuxia Zheng, Changsen Zhang, Jun Wei,