Novel Wastewater Treatment by Using Newly Prepared Green Seaweed–Zeolite Nanocomposite

Abstract

A dependent step-by-step study that included experimental and field study was applied to explore the simplest and most effective system that could be applied for adsorption of Congo Red (CR) dye from the effluent of wastewater that comes out from different industries. Zeolite (Z) surface and pores were subjected to a modification process using green seaweed (GS) algae. Thereafter, each Z, GS, and composite from both were evaluated based on the adsorption efficacy to clean up CR dyes from aqueous solutions. A wet impregnation method was followed to fabricate the zeolite/algae (ZGS) nanocomposite which was characterized using the most appropriate characterization techniques. Batch experiments were selected to be the method of choice in order to follow up the performance of the adsorption process versus different practical variables. Moreover, dye adsorption kinetics and isotherms were investigated as well. At lowered concentrations of CR, the novel nanocomposite ZGS revealed more efficacy than its counterparts, Z and GS, in terms of the adsorption capacity. The maximum adsorption capacities were found to be 8.10, 10.30, and 19.70 mg/g for Z, GS, and ZGS, respectively. Laboratory tests confirmed that the novel nanocomposite ZGS could be introduced as a new and economical nanoadsorbent to capture and remove negatively charged dyes from wastewater effluents that come out from industries at lower concentrations of CR dye and analogous compounds. The dye adsorption on GS, Z, and ZGS coincide with the pseudo-first, Langmuir isotherm, and second-order models. Evaluation for the sorption mechanism was conducted using a diffusion model known as Weber’s intraparticle. Depending on the last findings, field experiments on removing dyes from industrial wastewater revealed optimistic findings as the efficiency of our modern and eco-friendly nanoadsorbent reached 91.11%, which helps in the reuse of industrial wastewater.

Accessible Eco-Friendly Method for Wastewater Removal of the Azo Dye Reactive Black 5 by Reusable Protonated Chitosan-Deep Eutectic Solvent Beads

“…Hydroxyl ions and the anionic dye molecules compete among themselves, which might be responsible for the elution of RB5, as reported [28,47]. However, the adsorption of RB5 onto ST-Ch-DES beads seems stronger, possibly more difficult to desorb owing to the higher porosity and more cavities where the dye remains attached even after a long treatment with a strong alkali.…”

“…Alkaline solvents, namely, NaOH, have been used for desorption of anionic dyes as described by others [28,47]. Then, NaOH was tested to desorb RB5 from the ST-Ch-DES The separation factor constant, R L , allows us to estimate if the adsorption process is favorable or not, as it measures how suitable the adsorbent is.…”

“…Alkaline solvents, namely, NaOH, have been used for desorption of anionic dyes as described by others [28,47]. Then, NaOH was tested to desorb RB5 from the ST-Ch-DES beads.…”

Present status of Seaweed resources in Bangladesh: A review on the diversity, culture methods and utilization

“…Thirdly, more research should be needed to develop the human food commodities for local peoples as well as others seaweed products (e.g., carrageenan, alginate, agar, soil additives, fertilizer, seaweed meal, pharmaceuticals, cosmeceuticals, nutraceuticals, bioactives etc.). Fourthly, seaweed using wastewater plant should be developed, this could help to support industry setup in rural coastal regions as well as industrial biosecurity (Arumugam et al, 2018;Hamd et al, 2022;Znad et al, 2022). Finally, the seaweed sector needs a center of excellence/policy making branch that should be established wild seed bank to conserve genetic diversity in order to ensure the sustainable use and development of seaweed industry in Bangladesh.…”

Adsorption Mechanism and Electrochemical Characteristic of Methyl Blue onto Calcium Ferrite Nanosheets

“…With the increase of pH value, the positive charge held by the dye molecules progressively dropped, and the electrostatic repulsion also dropped, resulted in a gradual improvement in the capacity of adsorption of CaFe 2 O 4 nanosheets. The adsorption of MB capacity by the adsorbent remained largely unchanged when pH was greater than 3, mainly attributable to the electrostatic attraction of the negatively charged dye and the positively charged CaFe 2 O 4 and the saturation adsorption capacity of the CaFe 2 O 4 nanosheets [36,42]. 8(a), where the bare MGCE had the highest peak current.…”