Selection of suitable adsorbent for the removal of Cr(VI) by using objective based multiple attribute decision making method

Abstract

The objective of the current manuscript is to develop a systematic and simplified expert system for the selection of suitable adsorbent to treat Cr(VI). Selection of adsorbent among the large options available by considering all possible factors and their interaction is required in an easy, organized and rational way. In this study, fuzzy logic is used for the choosing an appropriate adsorbent for the Cr(VI) removal. Multiple attribute decision making (MADM) is utilized to work out the relative weighting values for the chosen sorbent. The preference index is calculated by using the subjective and objective weights. The normalized value associated with each parameter has given on the basis of effect of each parameter on the removal of Cr(VI) and uptake capacity of each material. The associated MADM method results and the barriers of the approach is mentioned to lay the basis for in addition enhancement.

A Decision-Making Framework for University Student Sports Study Psychological Healthy Evaluation with 2-Tuple Linguistic Neutrosophic Numbers

“…Multi-attribute decision-making usually has the following characteristics. (1) Multiple options: before making a possible decision, the DMs must rst measure the number of feasible options as an evaluation option [6][7][8]. (2) Multiple possible attributes: before making a possible decision, the decision maker needs to consider the number of feasible attributes and propose multiple attributes that a ect the decision-making of the scheme.…”

Process Technology for the Removal of Cr(VI) from Wastewater Using Pig Iron Sludge

“…From the table it is obvious that the experimental data obeys the Langmuir isotherm model as the R 2 values are close to 1. Hence, it can be concluded that adsorption follows the Langmuir [35].…”

“…In the aqueous solution, Cr(VI) is present in the form of Cr 2 O 7 2-. When the pH of the solution is reduced, a great number of H + ions can simply harmonize with the adsorbent surface, which becomes positively charged, so that it can easily absorb the negatively charged Cr ions [14,15]. No change in percentage adsorption below pH 3.0 may be due to the fact that the whole active surface in the adsorbent becomes positively charged and hence there is not much change in the surface charge by further lowering down the pH to 2.0 which in turn does not affect the percentage adsorption [16].…”