کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9451464 | 1307823 | 2005 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Polyacrylamide sorption opportunity on interlayer and external pore surfaces of contaminant barrier clays
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم محیط زیست
شیمی زیست محیطی
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چکیده انگلیسی
Physico-chemical interactions among polymer molecules in aqueous solution and clay mineralogical/textural characteristics influence the sorption of polymer molecules on clay barrier minerals. Amendment of potentially unstable barrier clays with aqueous polymers can improve barrier material resistance to environmental stresses during service. In this research, the ability of molecular coils of polyacrylamide (PAM) to overlap in solution and to enter interlayer space in Na-montmorillonite (specific surface = 31.82 ± 0.22 m2 gâ1) and kaolinite (specific surface = 18 ± 2 m2 gâ1) were analyzed theoretically and experimentally, using solution viscosity measurements, and X-ray diffractometry. Experimental data on two theoretical indices: relative size ratio (RSR); and molecular availability (Ma) that are formulated to scale polymer molecular sorption on clay interlayer, indicate that the sorption of PAM A (Mw = 4 000 000) and PAM B (Mw = 7 000 000) does not produce any significant change in the d-spacing of both clay minerals. Although the negative Ma values of â3.51 g lâ1 for PAM A and â3.88 g lâ1 for PAM B indicate high levels of entanglement of polymer molecular coils in solution, sorption data confirm that the entangled coils are still able to sorb onto Na-montmorillonite highly and kaolinite to a lesser extent.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemosphere - Volume 58, Issue 1, January 2005, Pages 19-31
Journal: Chemosphere - Volume 58, Issue 1, January 2005, Pages 19-31
نویسندگان
Hilary I. Inyang, Sunyoung Bae,