کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4998920 1460404 2017 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Substitution influence of halo polyurethane foam on the removal of bismuth, cobalt, iron and molybdenum ions from environmental samples
ترجمه فارسی عنوان
اثرات جایگزینی فوم هالو پلی اورتان بر حذف یون های بیسموت، کبالت، آهن و مولیبدن از نمونه های محیطی
کلمات کلیدی
کف پلی اورتان هاله، بیسموت، کبالت، اهن، مولیبدن،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تکنولوژی و شیمی فرآیندی
چکیده انگلیسی


- The polarity of PUF was modified by attaching halogen atoms to the surface.
- The sorption performances were investigated by batch and column experiments.
- X-PUFs possess highest sorption capacity for Bi, Co, Fe and Mo ions than PUF.
- The processes of metal extraction/recovery using X-PUFs are very fast.
- X-PUF could be successfully regenerated and reused.

Polyurethane foam was modified by the addition of halogen atoms and amino groups into the foam matrix in order to increase its polarity for the sorption of ionic species. The halo-modified sorbents (X-PUFs, X =  Cl, Br or I) were characterized using FTIR, UV/Vis and Raman spectroscopy, EA, XRD and SEM. The average values of pHZCP, maximum value of ∆pH (pH 9) and bulk DC conductivity for X-PUFs are 3.8, −1.9 and 2.6  ×  10−5 Ω−1 cm−1, respectively. The activity of the surface functional groups of X-PUFs were evaluated by the extraction of Bi(III), Co(II), Fe(III) and Mo(III) ions and extraction conditions including pH, shaking time, flow rate, temperature and initial metal concentration were optimized. Maximum extraction of those ions was achieved as their thiocyanate complexes in acidic medium (pH 1-3, 5-6 and 1.5-2 mol L−1 H2SO4) within 1-30 min. A perfect isotherm curve with almost zero intercept (0.008), good correlation coefficient R2 (0.973) was obtained. The values of LOD, LOQ and RSD (n  =  6) for the determination of Bi(III), Co(II), Fe(III) and Mo(III) ions are 2 ng L−1, 7 ng L−1 and 0.75%, respectively. The sorption capacities of the tested metal ions onto Cl-PUF, Br-PUF and I-PUF are 0.16, 0.14 and 0.14 mmol g−1, respectively. The accuracy of the procedure was verified by the analysis of food, ground water and pharmaceutical samples with recovery and average RSD values of 99-100% and 2.39%, respectively.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the Taiwan Institute of Chemical Engineers - Volume 70, January 2017, Pages 382-390
نویسندگان
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