Removal of textile-based dyes by nanofiltration: study of physicochemical parameters’ effect on the retention by experimental designs methodology

Abstract

A B S T R A C TThis paper focuses on nanofiltration (NF) process mainly in the retention of colored effluents chemicals and dyes as they are rejected from textile plants. The purpose of this work is to study the effect of initial dye concentration, pH, salt presence, conversion rate, and transmembrane pressure (PTM) on Basic Green 4 and Basic Yellow 2 retention by NF. Tangential filtration mode through a composite membrane NF270 type Dow FILMTEC was used in the experiments. Experimental designs such as full factorial design and Box-Behnken matrix were used. Tests have shown that the pH, the conversion rate, and salt concentration have a negative influence on Basic Green 4 and Basic Yellow 2 retention. By comparison, the PTM and initial dye concentration have a positive effect on the retention of these dyes. Finally, the retention rate for Basic Yellow 2 and Basic Green 4 was higher than 90% in our study.

Equilibrium, kinetic and thermodynamic studies of methyl orange removal by adsorption onto granular activated carbon

“…Various techniques have been applied for the removal of azo-dyes from aqueous solutions, including extraction [9], coagulation and flocculation [10], adsorption [11,12], biosorption [12], coprecipitation [13], sonochemical [14] and electrochemical [15] degradations, membrane processes (micellar enhanced ultrafiltration [16], nanofiltration [17], and ion exchange [18]), advanced oxidation processes (Fenton [19] and UV/H 2 O 2 photodegradation [20]), and integrated treatments [21].…”

Synthesis of Nanocomposite Poly(vinyl alcohol)‐Tin Oxide Mixed‐Matrix Membranes for Textile Effluent Treatment

“…At high pH (> 10), they bond with hydroxyl and carboxyl groups in the membrane. Hence, there is a decrease in charge density on the membrane surface, which leads to lesser repulsion of the dye molecules and subsequently lesser rejection with increasing pH . Some researchers have come up with the theory that reactive dyes hydrolyze at high pH conditions, where these hydrolyzed dyes are better able to permeate through the membranes .…”

Development of high flux nanofiltration membranes through single bilayer polyethyleneimine/alginate deposition

“…In addition, the dye permeance of our membrane is higher than most of the other membranes listed in Table 4, which indicates that the retention of Congo red is achieved with a lower energy consumption. The effect of transmembrane pressure on the rejection of various dyes by NF membranes has been investigated by different groups [32][33][34][35]. In all these studies, an increase in dye rejection was observed with increased pressure.…”