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Modified Biopolymer Adsorbents for Column Treatment of Sulfate Species in Saline Aquifers
| Content Provider | MDPI |
|---|---|
| Author | Solgi, Mostafa Tabil, Lope G. Wilson, Lee D. |
| Copyright Year | 2020 |
| Description | In the present study, variable forms of pelletized chitosan adsorbents were prepared and their sulfate uptake properties in aqueous solution was studied in a fixed-bed column system. Unmodified chitosan pellets (CP), cross-linked chitosan pellets with glutaraldehyde (CL–CP), and calcium-doped forms of these pellets (Ca–CP, Ca–CL–CP) were prepared, where the removal efficiencies and breakthrough curves were studied. Dynamic adsorption experiments were conducted at pH 4.5 and 6.5 with a specific flow rate of 3 mL/min, fixed-bed height of 200 mm, and an initial sulfate concentration of 1000 mg/L. Breakthrough parameters demonstrated that Ca–CP had the best sulfate removal among the adsorbents, where the following adsorption parameters were obtained: breakthrough time (75 min), exhaust time (300 min), maximum sulfate adsorption capacity (qmax; 46.6 mg/g), and sulfate removal (57%) at pH 4.5. Two well-known kinetic adsorption models, Thomas and Yoon-Nelson, were fitted to the experimental kinetic data to characterize the breakthrough curves. The fixed-bed column experimental results were well-fitted by both models and the maximum adsorption capacity (46.9 mg/g) obtained was for the Ca–CP adsorbent. A regeneration study over four adsorption-desorption cycles suggested that Ca–CP is a promising adsorbent for sulfate removal in a fixed-bed column system. |
| Starting Page | 2408 |
| e-ISSN | 19961944 |
| DOI | 10.3390/ma13102408 |
| Journal | Materials |
| Issue Number | 10 |
| Volume Number | 13 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2020-05-23 |
| Access Restriction | Open |
| Subject Keyword | Materials Water Science and Technology Fixed-bed Column Adsorption Chitosan Pellets Thomas Model Yoon-nelson Model |
| Content Type | Text |
| Resource Type | Article |
