کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
624920 1455412 2011 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Arsenic (V) removal with modifiable bulk and nano p(4-vinylpyridine)-based hydrogels: The effect of hydrogel sizes and quarternization agents
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
Arsenic (V) removal with modifiable bulk and nano p(4-vinylpyridine)-based hydrogels: The effect of hydrogel sizes and quarternization agents
چکیده انگلیسی

Macrogels and nanogels (5 × 6 mm and 370 nm dimensions, respectively) based on 4-vinylpyridine (p-(4VP)) were prepared using redox and microemulsion techniques. The p(4-VP)-based materials were quaternized with HCl/alkyhalides having different chain lengths to tune the charges (macro and nanogels) and size of nanogels. By developing positive charge on the p(4-VP) materials, they behaved as ion exchangers and used in removal of As(V) from aqueous environments. The prepared p(4-VP) materials were also rendered responsive to magnetic field by in situ incorporation of magnetic metal nanoparticles inside macro p(4-VP) hydrogels and by encapsulation of separately prepared magnetic ferrites by nanosized p(4-VP) particles. Nanoparticles quaternized with HCl (p(4-VP)-HCl) (1 g) removed over 95% of As(V) from a stock solution (10 mg L− 1, 1000 mL) in 15 min whereas bulk hydrogels removed > 82% of the As(V) from an equivalent solution in ~ 12 h. Parameters effecting the As(V) removal, including pH, temperature and ionic strength, were also investigated. The synthesized magnetic p(4-VP) composites could be reused after elution with NaOH and regeneration with quaternization agents; these procedures were facilitated using an externally applied magnetic field. The Langmuir and Freundlich adsorption isotherms were also applied to study the removal of As(V) from aqueous environments.

Figure optionsDownload as PowerPoint slideResearch highlights
► As(V) removal using smart macro and nanosized p(4-VP) based hydrogels.
► The effect of hydrogel size and quarternization agents on As(V) removal from aqueous media by modifiable benign hydrogels.
► The investigation of the parameter such as pH, T and ionic strength on As(V) removal.
► The reusability of modified p(4-VP) based materials in toxic metal elimination.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Desalination - Volume 279, Issues 1–3, 15 September 2011, Pages 344–352
نویسندگان
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