Novel adsorbent from agricultural waste (cashew NUT shell) for methylene blue dye removal: Optimization by response surface methodology

Abstract

a b s t r a c t Activated carbon, prepared from an agricultural waste, cashew nut shell (CNS) was utilized as an adsorbent for the removal of methylene blue (MB) dye from aqueous solution. Batch adsorption study was carried out with variables like pH, adsorbent dose, initial dye concentration and time. The response surface methodology (RSM) was applied to design the experiments, model the process and optimize the variable. A 2 4 full factorial central composite design was successfully employed for experimental design and analysis of the results. The parameters pH, adsorbent dose, initial dye concentration, and time considered for this investigation play an important role in the adsorption studies of methylene blue dye removal. The experimental values were in good agreement with the model predicted values. The optimum values of pH, adsorbent dose, initial dye concentration and time are found to be 10, 2.1846 g/L, 50 mg/L and 63 min for complete removal of MB dye respectively.

Removal of methylene blue from aqueous solutions using alum Sludge: Sorption optimization by response surface methodology

“…But, the percentage removal decreased from 98.16 to 86.33 % when the contact period increased from 120 to 180 min. Similar trend was found by [20]. According to [19], MB molecules have sufficient time for the adsorption when long contact period is provided.…”

“…The initial concentration provides the necessary driving force which this force overcome the resistance to the mass transfer of MB dye between solid and aqueous phase, therefore the interaction between dye molecules and sorbent enhanced and the sorption uptake increased [20]. Although driving force existed, high initial MB dye concentration may cause overload of the dye molecules.…”

Optimization of process parameters for methylene blue removal by jute stick using response surface methodology

“…The “ t ” test, generally, is used to understand the significance of the regression coefficients of the independent factors and the P values are used to understand the significance of each of the interaction among the independent factors. Generally, higher the “ t ” value coupled with smaller P value, represents the greater significance of the corresponding regression coefficient . Table represents the regression coefficients and corresponding “ t ” and “ P ” values for all linear, quadratic and interactions of the independent factors.…”

Biosorption of anionic textile dyes from aqueous solution by yeast slurry from brewery

“…On the order hand, adsorption by biological material provides an alternative way for the bioadsorptive decolorization. In the past few years, extensive studies have been undertaken to decolorize aqueous solution and textile wastewater using biomass from apple pomace and wheat straw (Robinson et (Subramaniam and Ponnusamy, 2015). Generally, these biosorbents are abundant in nature, or are by-products or waste from the industry, having little or no economic value, and require minimal or no processing (Tunç et al, 2009).…”