Performance studies of indigo dye removal using TiO2 modified clay and zeolite ultrafiltration membrane hybrid system

Abstract

Dyes contamination causes serious damages to the aquatic life's and human health.With increase in these persistent organic contaminants accumulation around the world, performant environmentally friendly and low cost materials and techniques are required to protect ecosystem and human. In this study, the efficacy of titania-smectite nanocomposites (Sm-TiO2 NCs) at removing indigo blue (IB) dye was assessed by both batch adsorption and hybrid treatment combining adsorption and ultrafiltration (UF) processes. During the adsorption, the effect of different parameters on IB removal such as dose of Sm-TiO2, contact time, pH and IB concentration were studied. The optimal conditions were applied for the Sm-TiO2 during dye removal using adsorption/UF hybrid treatment. At 293 K and pH 2.5, an optimized dose of Sm-TiO2 (100 mg/L) removed 73 % of the IB from a 25 mg/L solution in 240 min with an equilibrium adsorption capacity greater than180 mg/g. The adsorption of IB dye by Sm-TiO2 NCs followed Langmuir adsorption isotherm model and pseudo-secondorder kinetics. The thermodynamic studies revealed that the adsorption process was 2 spontaneous and exothermic. When a hybrid process was applied, a higher IB removal capacity has been obtained with a lower dose of Sm-TiO2 compared to the case of batch adsorption process. In addition, the presence of Sm-TiO2 NCs has been found to reduce the UF membrane fouling. In this case, the adsorption followed by UF treatment applied in two stages was modified to a single stage hybrid process. Permeate flux was increased from 71 L/h.m 2 (only UF) to 182 L/h.m 2 (Sm-TiO2/UF).

Evaluation of TiO2/smectite nanoparticles as an alternative low-cost adsorbent for chromium removal from industrial wastewater

“…The application of this nanocomposite for the removal of Cr(VI) from industrial wastewater showed an adsorption capacity of chromium of 22.3 mg/g at the pH range 3.8-5.5. The removal kinetics was found to follow the Freundlich Pseudo-first-order [24] pseudo-second-order and the maximum amount adsorbed was best simulated by the Langmuir isotherm model [42].…”

“…Thermodynamic properties, such as enthalpy, entropy and the free energy were also estimated to provide insight into the adsorption mechanism during the adsorption removal of the chromium. These NP are used in different applications such as membrane separation [15,[21][22][23], hybrid system and adsorption [24] to treat different effluents. High performances of these NP encourage their use in the elimination of heavy metals by adsorption.…”

Fabrication of highly crystalline covalent organic framework for solid‐phase extraction of three dyes from food and water samples

“…(7) The sample loading flow rate (1, 2, 3, 4, 5, and 6 ml/min). (8) The volume of desorption solvent (1, 2, 3, 5, 7, and 9 ml). The food samples including pork and fish used in the experiments were purchased from supermarkets near the laboratory (Luzhou, Sichuan).…”

“…Even very small amounts of dyes can reduce light transport in the water environment and thus reduce plant photosynthesis. More seriously, these dye wastewaters can lead to contamination of water, thus causing tumors, mutations and heart diseases to human (Basu & Kumar, 2015;Romdhani, et al, 2021;Salleh, Mahmoud, Karim, & Idris, 2011). For food, food dyes are found in many foods, such as meat, cereals, confectionery, beverages, and are even applied in pharmaceutics.…”

“…Even very small amounts of dyes can reduce light transport in the water environment and then reduce plant photosynthesis. More seriously, this dye wastewater can lead to contamination of water [6][7][8]. Besides, food dyes are found in various foods such as meat, cereals, confectionery, and beverages.…”