کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
583980 877881 2008 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Characterization of Cr(VI) removal from aqueous solutions by a surplus agricultural waste-Rice straw
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی بهداشت و امنیت شیمی
پیش نمایش صفحه اول مقاله
Characterization of Cr(VI) removal from aqueous solutions by a surplus agricultural waste-Rice straw
چکیده انگلیسی
The removal of Cr(VI) from aqueous solution by rice straw, a surplus agricultural byproduct was investigated. The optimal pH was 2.0 and Cr(VI) removal rate increased with decreased Cr(VI) concentration and with increased temperature. Decrease in straw particle size led to an increase in Cr(VI) removal. Equilibrium was achieved in about 48 h under standard conditions, and Cr(III), which appeared in the solution and remained stable thereafter, indicating that both reduction and adsorption played a part in the Cr(VI) removal. The increase of the solution pH suggested that protons were needed for the Cr(VI) removal. A relatively high level of NO3− notably restrained the reduction of Cr(VI) to Cr(III), while high level of SO42− supported it. The promotion of the tartaric acid modified rice straw (TARS) and the slight inhibition of the esterified rice straw (ERS) on Cr(VI) removal indicated that carboxyl groups present on the biomass played an important role in chromium remediation even though were not fully responsible for it. Isotherm tests showed that equilibrium sorption data were better represented by Langmuir model and the sorption capacity of rice straw was found to be 3.15 mg/g.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hazardous Materials - Volume 150, Issue 2, 31 January 2008, Pages 446-452
نویسندگان
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