期刊
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
卷 18, 期 8, 页码 2125-2136出版社
SPRINGER
DOI: 10.1007/s13762-020-02968-7
关键词
Water treatment; Heavy metals; Leaf biomass; Adsorption; Isotherm; Removal mechanism
资金
- research project entitled: Smart wireless sensor network to detect and purify water salinity and pollution for agriculture irrigation (SMARTWATIR), ERANETMED [3.227]
- Science, Technology, and Innovation Funding Authority (STDF-STIFA), Egypt [42961]
This study investigated the removal of chromium (Cr(VI)) using plant biomass, Phragmites australis and Ziziphus spina-christi. The pseudo-second-order model was found to fit the experimental data well with R(2) = 0.99, and the diffusion model played a significant role in the rate-determining step. Isotherm models were fitted in the order of Langmuir > Freundlich > Temkin models, and maximum adsorption capacities were determined for both plant biomass. Insights into biosorption behavior were obtained using various analytical techniques.
In this study, we investigated the modeling of chromium (Cr(VI)) removal using globally available plant biomass:Phragmites australisandZiziphus spina-christi. Biosorption parameters were initial Cr(VI) concentration (50-800 mg L-1), contact time (1-180 min), adsorbent dose (0.25-2.0 g L-1), and pH (2-8) at agitation speed of 100 rpm. Based on the results of batch experiments and modeling, pseudo-second-order model was fitted to the experimental data whereR(2) = 0.99; besides, diffusion model played a significant role in the rate-determining step. Isotherm models were fitted in the order of Langmuir > Freundlich > Temkin models. Maximum adsorption capacities were recorded 21.32 mg g(-1)and 15.55 mg g(-1)forPhragmites australisandZiziphus spina-christi, respectively. Insights into biosorption behavior were determined using Fourier-transform infrared spectra (FT-IR), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDX). SEM-EDX revealed the chromium presence and its accumulation on both biosorbents after the biosorption process. Cr(VI) biosorption mechanism is illustrated and can be related to electrostatic interactions, reduction and chelation/complexation with the functional groups of both adsorbents.
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