کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4407669 1618818 2016 15 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The influence of acid treatments over vermiculite based material as adsorbent for cationic textile dyestuffs
ترجمه فارسی عنوان
تاثیر تیمار اسید بر مواد ورمیکولیت به عنوان جاذب برای رنگدانه های نساجی کاتیونیت
کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
چکیده انگلیسی


• Treatment of vermiculite (nitric and citric acids) increases its sorption capacity.
• A successful application in column tests for cationic textile dyestuffs removal.
• New perspectives arise for this sorbent in wastewater treatment.

The influence of different acid treatments over vermiculite was evaluated. Equilibrium, kinetic and column studies have been conducted. The results showed that vermiculite first treated with nitric acid and then with citric acid has higher adsorption capacity, presenting maximum adsorption capacities in column experiments: for Astrazon Red (AR), 100.8 ± 0.8 mg g−1 and 54 ± 1 mg g−1 for modified and raw material, respectively; for Methylene Blue (MB) 150 ± 4 mg g−1 and 55 ± 2 mg g−1 for modified and raw material, respectively. Materials characterization by X-ray diffraction, UV–vis-diffuse reflectance spectroscopy, diffuse reflectance infrared Fourier transform spectroscopy, X-ray fluorescence, N2 adsorption and CEC determination, has been performed. The results suggest the existence of exchange of interlayer cations, leaching of metals from vermiculite's sheets and formation of an amorphous phase in the material. Adsorption follows pseudo 2nd order model kinetics for both dyestuffs and equilibrium occurs accordingly to Langmuir's model for AR and Freundlich's model for MB. In column systems Yan's model is the best fit. The enhanced properties of acid treated vermiculite offer new perspectives for the use of this adsorbent in wastewater treatment.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemosphere - Volume 153, June 2016, Pages 115–129
نویسندگان
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