A Study of Nitrate Uptake from Aqueous Solutions Using Isotactic Polypropylene-based Anion Exchangers
Bibliographic record
Abstract
Two series of efficient and cost-effective anion exchangers possessing biocidal properties are reported for the removal of nitrate ions from aqueous solutions. Isotactic polypropylene (IPP) was modified by graft copolymerization with poly(4-vinyl pyridine) using γ-rays as initiator. The graft copolymers were functionalized further by reaction with sodium 2-bromoethane sulphonate or 2-Chloroethanol to generate, respectively, the zwitterionic or choline-analogous structure on the IPP backbone. The functionalized graft copolymers have exchangeable Cl- or Br- ions and possess antimicrobial properties due to their polycationic character. These exhibited structure-property relationship when evaluated as anion exchangers for NO3- ions of which the maximum was removed from the feed solution with the graft copolymer having the lowest percent grafting. But the nature of the counter anion present did not exhibit much difference in the nitrate uptake behaviour. A parametric study, to evaluate the effect of different conditions on nitrate uptake, was carried as a function of contact time, temperature, pH of medium and NO3- concentration. A high maximum exchange capacity of 14.77 mg/g and 13.62 mg/g was observed, respectively for the graft copolymers having Br- and Cl- as the counter anions, at pH 5.0, 35 ºC, and 20 ppm of the nitrate ions after ten cycles. The materials also exhibited good reusability up to ten cycles. The kinetics and mechanism of nitrate removal was studied and the data was found to fit the pseudo-second order kinetics and Langmuir isotherm.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".