A review on adsorbent parameters for removal of dye products from industrial wastewater

Abstract

Industrial effluents are usually one of the major industries polluting the environment and surface water. It is estimated that the worldwide production of dyes is about 70 tons/year. To overcome this problem, innovative processes are suggested for the treatment of industrial effluents containing dyes and heavy metals. The goal of the processes is often to reduce the toxicity of these pollutants in order to meet treatment standards. Recently, great attention has been paid to innovative processes for physical and chemical removal techniques such as adsorption on new adsorbents, biomass adsorption, membrane filtration, irradiation, and electrochemical coagulation. In this study, the application of adsorbents in the adsorption process to remove dye pollutants from industrial effluents has been studied. Factors affecting dye adsorption such as pH, temperature, initial dye concentration, and adsorbent amount are also presented. The obtained results revealed that more than 80% of the dye adsorption on the surface of adsorbents are endothermic processes and more than 95% of the processes obey the pseudo-second-order kinetic model.

Use of <i>Eichhornia Crassipes</i> as a Bioadsorbent for the Removal of Methyl Orange and Methylene Blue Present in Residual Solutions

“…[Riza et al, 2020; Jedynak et al, 2021; Zaghoul et al, 2021], but in the case of ΔH, it is only reported for nanoparticles, mesopore carbons and hydrogel [Anastopoulos et al, 2017; Jedynak et al, 2021; Riza et al, 2020] they have an endothermic nature for MB and MO, respectively, which in the obteined results are consistent with WLN.In other studies, it was determined that there is an exothermic process where modified hydroxyapatites are used as adsorbents[Guan et al, 2018], biochar from E. crassipes[Nurhadi et al, 2019], chitosan/cellulose[Xu et al, 2021], biochar with pineapple leaves[Soltani et al, 2021)] and MgAl[Zaghoul et al, 2021] this behavior is what was determined for the WLW adsorbent. In the case of the randomness of the solid/liquid interface in the…”

Experimental Insights into Mesoporous Polyaniline-Based Nanocomposites for Anionic and Cationic Dye Removal

“…Dye contains two components, that is, a dye agent and a dye enhancer. The dye agent imparts color in water, and the dye enhancer amplifies the dye agent, making the dye soluble in water and attaching to the surface . Thus, the untreated dyes draining into the water source jeopardize ecotoxicological effects .…”

“…The dye agent imparts color in water, and the dye enhancer amplifies the dye agent, making the dye soluble in water and attaching to the surface. 7 Thus, the untreated dyes draining into the water source jeopardize ecotoxicological effects. 8 Dyes also have ill effects on human health, including respiratory problems, skin irritation, itchy and watery eyes, and cancer.…”

Removal of Anionic and Cationic Dyes Present in Solution Using Biomass of Eichhornia crassipes as Bioadsorbent

“…Nevertheless, these proceeds have two main limitations: production of by-products and the high cost of maintenance [ 2 , 5 , 18 ]. On the other hand, biological treatment is not effective for this type of contaminant due to the low biodegradation of dyes [ 2 , 13 , 19 , 20 , 21 , 22 ]. Adsorption has shown to have some advantages over the mentioned methods due to its high efficiency in the removal of dyes from wastewater including dilute solutions, and the absence of sediment produced in its operation [ 4 , 12 , 19 , 23 , 24 , 25 , 26 ].…”

“…Adsorption has shown to have some advantages over the mentioned methods due to its high efficiency in the removal of dyes from wastewater including dilute solutions, and the absence of sediment produced in its operation [ 4 , 12 , 19 , 23 , 24 , 25 , 26 ]. Different adsorbents have been synthesized for the removal of dyes from clays such as SBA-15, Bentonite, and other materials [ 2 , 4 , 17 , 27 , 28 , 29 ], up to the manufacture of activated carbon from different sources, however, there are large losses and high operating costs due to the possibility of pore blockage, hydroscoping, and incineration when using high temperatures [ 5 , 19 , 22 , 24 , 27 , 28 , 29 ]. These drawbacks have encouraged several researchers to study other cheap, abundant materials that have similar efficiency to materials synthesized by chemical processes, therefore the use of agro-industrial residues was considered, which are cheap and, easily available materials that only need a simple pretreatment and are materials with properties that can be exploited in another industry as well as being good candidates for the adsorption of various contaminants [ 8 , 12 , 14 , 19 , 22 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 ].…”