Process Optimization Studies of Congo Red Dye Adsorption onto Magnesium Aluminium Layered Double Hydroxide Using Response Surface Methodology

Abstract

Textile and dyeing industry have a large production network and rapid growth. However, the use of large quantities of industrial dyes and untreated wastewater pollutes the soil and water environment and directly affects human, animal and plant health. Therefore, the most important thing is to develop new adsorbents with high removal efficiency and fast separation rate to handle a large amount of waste. In this study, Mg/Al LDHs materials were successfully synthesized by hydrothermal method. The SEM images, which can be observed from the low-magnification, show that Mg/Al LDHs have morphology similar to hierarchical flower. In addition, strong intensities in XRD result indicates the high purity and good crystallization in LDH-type materials. Three factors affecting Congo red (CR) adsorption capacity include: Influence of CR solution concentration, effect of solution pH and reaction time conducted by response surface method (RSM) to find the optimal conditions for CR removal. The experimental results showed that at CR concentration 52.32 mg/L, the reaction time of 118 minutes and pH 5.8 obtained the

Nano round polycrystalline adsorbent of chicken bones origin for Congo red dye adsorption

“…To this end, several materials have been reported for Congo red uptake and some of them are FexCo 3 -xO 4 nanoparticles 6 , soybean curd xerogels 10 , graphene oxide 11 , rice husk 12 , coffee waste 13 , tunics of the corm of the saffron 14 , cadmium(II) metal–organic frameworks 15 , magnesium aluminium layered double hydroxide 16 , guava leaf-based activated carbon 17 , pine bark 18 , and industrial waste 19 have been developed. Attallah et al 20 used metal hydroxide sludge (MHS) obtained from hot dipping galvanizing plant as adsorbent for removal of CR, Maximum uptake capacity of 40 mg g −1 was attained at solution pH of 6.0, Kumar et al 21 studied the use of starch/AlOOH/FeS 2 nanocomposite as excellent adsorbent for the removal of CR from an aqueous solution.…”

Preparation of Magnetic Composite Polyaniline/Fe3O4−Hydrotalcite and Performance in Removal of Methyl Orange

“…Among them, adsorption is the popular method because of its efficiency and economy. The adsorbents which were widely used to remove azo dyes are either inorganic such as activated carbon [3][4][5][6], hydrotalcite [7][8][9][10], diatomite [11][12][13][14][15] and bentonite [16][17][18][19], or organic such as chitosan, alginate, polysaccharide, and polymer materials [20][21][22][23][24][25][26][27][28][29][30][31] and also hybrid and composite material [32][33][34][35][36][37][38][39]. However, the most challenge for the above adsorbents is the low adsorption capacity and efficiency.…”