PMC:4764609 / 26072-27210 JSONTXT

{"target":"http://pubannotation.org/docs/sourcedb/PMC/sourceid/4764609","sourcedb":"PMC","sourceid":"4764609","source_url":"https://www.ncbi.nlm.nih.gov/pmc/4764609","text":"Statistical analysis\nExperimentally, highest adsorption capacity was obtained at an adsorbent dosage of 8 g/L, initial metal ion concentration 20 mg/L, and pH 6. With these preliminary results, further experiments on the factors affecting adsorption were carried out using three level full factorial design under RSM with varying levels of adsorbent dosage, metal ion concentration and pH.\nThe coded and the actual values of the test variables are as given in Table 1. Multiple regression analysis of the data for adsorption yielded the following regression equation.13 Y=+95.25-1.74X1+0.56X2-0.089X3-5.84X1X2-2.09X1X3-1.00X2X3-16.11X12-2.29X22-0.82X32where Y is the % adsorption of copper, X 1 adsorbent dosage, X 2 is the metal ion concentration and X 3 is the pH. Solving the regression equation using fmincon function, the optimum set of values for the three variable X 1, X 2 and X 3 were −0.0960, +0.2651 and −0.0936. Hence, it was inferred that for maximum adsorption of copper with the DNES-CH composite, the adsorbent dosage, metal ion concentration and pH should ideally be kept at 7.90 g/L, 20.2651 mg/L and 5.906 respectively.","divisions":[{"label":"title","span":{"begin":0,"end":20}},{"label":"p","span":{"begin":21,"end":389}},{"label":"label","span":{"begin":567,"end":569}}],"tracks":[]}