Performance Evaluation and Optimization of Dyes Removal using Rice Bran-Based Magnetic Composite Adsorbent

Abstract

Although several studies have explored green adsorbent synthesized from many types of agriculture waste, this study represents the first attempt to prepare an environmentally friendly rice bran/SnO2/Fe3O4-based absorbent with economic viability and material reusability, for the promotion of sustainable development. Here, rice bran/SnO2/Fe3O4 composites were successfully synthesized and applied for adsorption of reactive blue 4 (RB4) and crystal violet (CV) dyes in aqueous solutions. The adsorption data were well-fitted by the Langmuir isotherm model and the pseudo-second-order kinetic model. The maximum adsorption capacities of the RB4 and CV dyes as indicated by the Langmuir isotherm model were 218.82 and 159.24 mg/g, respectively. As results of response surface methodology (RSM) showed, the quadratic model was appropriate to predict the performance of RB4 dye removal. The findings exhibited that an optimum removal rate of 98% was achieved at 60 °C for pH 2.93 and adsorption time of 360 min. Comparative evaluation of different agricultural wastes indicated that the rice bran/SnO2/Fe3O4 composite appeared to be a highly promising material in terms of regeneration and reusability, and showed that the composite is a potential adsorbent for dye removal from aqueous solutions. Overall, the study results clearly suggest that an adsorbent synthesized from rice bran/SnO2/Fe3O4 magnetic particle composites provides encouraging adsorption capacity for practical applications for environmental prevention.

Factors Affecting Synthetic Dye Adsorption; Desorption Studies: A Review of Results from the Last Five Years (2017–2021)

“…Thus, increasing the adsorbent dose is positively correlated with the efficiency and performance of dye removal. With increasing adsorbent dosage, at fixed contaminant concentrations, more active surface area is available for adsorption and more active adsorption sites are available [ 189 ].…”

Dye removal from water and wastewater by nanosized metal oxides - modified activated carbon: a review on recent researches

“…The acidity and basicity of dye solutions can be determined by pH measurement as one of the main and crucial factors in the adsorption process [40]. Therefore, the study of the initial pH of the dye solutions due to the effect on the rate of adsorption is necessary to be performed in all adsorption processes [152]. The alteration of solution pH can directly affect the efficiency of adsorption processes because of the surface protonation of materials, changing of the adsorbent surface properties, and charge of dye [69,153].…”

Using Rice Bran Hydrogel Beads to Remove Dye from Aqueous Solutions

“…Although activated carbon exhibits the highest adsorption effectiveness, it is costly to produce and requires a complex procedure to regenerate [12,13]. Therefore, studies have focused on developing cost-efficient adsorbents [14][15][16][17]. Selecting the base materials for preparing adsorbents requires one to consider whether there are sufficient sources for the materials and whether said materials are cost-efficient and environmentally friendly [18][19][20][21][22].…”

“…In recent years, many studies have pointed out that modified hydrogel beads may improve the shortcomings of the adsorbent. In addition, after acetic acid or ammonia modification, oxygenic functional groups of hydrogel beads can be increased and the surface of hydrogel beads can be positively charged [15,26].…”