Dye sequestration using agricultural wastes as adsorbents

Abstract

Cite this article as: Kayode Adesina Adegoke and Olugbenga Solomon Bello, Dye sequestration using agricultural wastes as adsorbents, Water Resources and Industry, http://dx. AbstractColour is a visible pollutant and the presence of even minute amount of coloring substance makes it undesirable due to its appearance. The removal of color from dye-bearing effluents is a major problem due to the difficulty in treating such wastewaters by conventional treatment methods. The most commonly used methods for color removal are biological oxidation and chemical precipitation. However, these processes are effective and economic only in the case where the solute concentrations are relatively high. Most industries use dyes and pigments to color their products. The presence of dyes in effluents is a major concern due to its adverse effect on various forms of life. The discharge of dyes in the environment is a matter of concern for both toxicological and esthetical reasons. It is evident from a literature survey of about 305 recently published papers that low-cost adsorbents have demonstrated outstanding removal capabilities for dye removal and the optimal equilibrium time of various dyes with different charcoal adsorbents from agricultural residues is between 4 and 5 hrs. Maximum adsorptions of acidic dyes were obtained from the solutions with pH 8-10. The challenges and future prospects are discussed to provide a better framework for a safer and cleaner environment.

Factor Affecting Textile Dye Removal Using Adsorbent From Activated Carbon: A Review

“…In addition, activated carbon prepared from agricultural waste came to be promising in the case of sugarcane bagasse, pomegranate peel, coconut shell [31][32]44,87]. Several activation process also been studied to improve the efficiency in removing dyes and pollutants in wastewater [38,52,46,[87][88]. However, most of the study referred in this review referring to lab-scale experiment.Based on literature information, only few study focus on comparing the adsorbent in removal of dye and pollutants [25].…”

Preparation of Activated Carbon from Date Seeds and Evaluation of Its Applications

“…The MB (Scharlau) concentration used was 0.995 g/ml. It has a molecular weight of 319.86 g/mol, density of 0.995 g/cm 3 , molecular formula is C 16 H 18 CIN 3 S. The MB and all other chemicals, such as NaOH and HCl, were laboratory grade. The instruments used for DSAC preparation were: muffle furnace (Nabertherm more than heat 30-3000 °C), conductivity meter (Elico, CM183EC-TDS Analyser) and digital magnetic stirrer (WiseStir MS-D-Digital magnetic stirrer).…”

“…On the other hand, ash content of both CAC and DSAC are 5% and 6%, respectively which shows that DSAC has slightly more ash content. Likewise, both activated carbons have almost same bulk density of 0.3 g/cm 3 . …”

“…Discharge of dyes in to effluents affects the people who may use these effluents for living purposes such as washing, bathing and drinking [2]. The conversion of waste materials and agriculture by-products, into ACs would add considerable economic value, help reduce the cost of waste disposal and most importantly provide a potentially inexpensive alternative to the existing commercial activated carbon (CAC) [3]. The present work deals with preparation of DSAC and verify its efficiency in removal of methylene blue (MB) from aqueous solutions and to compare the results with the CAC.…”

Photo-Catalytic Behavior of Cdse QDS Sensitized Zr-(1,3,5-Benzene Tricarboxylic Acid) Metal-Organic Frameworks.

“…Photo-catalyst based degradation process has been considered as an alternative technique among various physical [2], chemical [3] and biological [4] techniques for water treatment due to its advantages over the traditional techniques, such as simplicity, quick oxidation, high efficiency and no formation of polycyclic products. Using semiconductors such as metal oxides and sulfides, such as TiO 2 [5], ZnO [6], Fe 2 O 3 [7] and WO 3 [8], for photo-catalytic decolorization of pollutants has received much attention because of possible practical applications.…”