کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
152044 456486 2010 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Chromium (VI) removal by methylated biomass of Spirulina platensis: The effect of methylation process
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Chromium (VI) removal by methylated biomass of Spirulina platensis: The effect of methylation process
چکیده انگلیسی

Biosorption of heavy metals is an interesting approach to treat industrial wastewaters by an environmentally friendly system. Spirulina platensis biomass, an effective biosorbent for cations, cannot be used to adsorb chromate due to its negatively charged surface close to neutral conditions; therefore, methylation of biomass was performed to increase its adsorption capacity under these conditions. Batch adsorption tests carried out varying both Cr(VI) and methylated biomass concentrations showed that 2–4 g l−1 of biosorbent were able to remove Cr(VI) with efficiency ≥80%, while higher Cr(VI) levels (43–50 mg l−1) showed low removal efficiency. The model of Langmuir was shown to describe the adsorption phenomenon better than the Freundlich one. The values of the overall adsorption capacity of methylated biomass suggested that increased biosorbent availability does not necessarily correspond to larger amount of adsorbed metal. FT-IR spectra of dried and methylated biomass of S. platensis allowed us monitoring the efficiency of the methylation process through the analysis of CH and COO− vibrational stretching modes, taken as diagnostic of this process.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Engineering Journal - Volume 156, Issue 2, 15 January 2010, Pages 264–269
نویسندگان
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