Photocatalytic and adsorption studies on the removal of dye Congo red from wastewater

Abstract

Many industries such as paper, food, cosmetics, textiles etc. use dye in order to colour their products. The presence of these dyes in water even at very low concentration is highly visible and undesirable. Colour is the first contaminant to be recognised. Photocatalytic technique and adsorption methods offer a good potential to remove colour from wastewater. In the present paper these two methods were employed for removal of Congo red and both the techniques were found to be very useful and cost effective for a better removal of dye and the results were compared. The operating variables such as adsorbent dose, adsorbate concentration, pH etc were optimised.

Adsorptive removal of Congo red, a carcinogenic textile dye, from aqueous solutions by maghemite nanoparticles

“…As a result, considerable amount of colored wastewater is generated. The presence of these dyes in water even at very low concentration is highly visible and undesirable [20]. The degradation by-products of organic dyes such as synthetic azo-dyes have dangerous impacts on the environment since it contains toxic aromatic amine compounds and the removal rate of these materials during aerobic waste treatment are still low [11].…”

Adsorption of Methylene Blue from Aqueous Solution onto a Low-Cost Natural Jordanian Tripoli

“…Over the years, a number of workers have used different waste materials. They have studied the feasibility of using low cost materials, such as waste orange peel [6] , banana pith [7] , cotton waste, rice husk [8] , betonite clay [9] , neem leaf powder, [10] powdered activated sludge, perlite [11] , bamboo dust, coconut shell, groundnut shell, rice husk and straw, duck weed [12] , sewage sludge [13] , sawdust carbon [14] and gram husk [15] , coal bottom ash [16][17][18] , bagasse fly ash [19] , blast furnace slag [20] , deoiled soya [21,22] , red mud [23] and sawdust [24] as adsorbents for removal of various dyes from wastewaters.…”

Adsorptive removal of Erythrosine dye onto activated low cost de-oiled mustard

“…Thus, many researchers researched for cheaper substitutes, which are relatively inexpensive, and are at the same time endowed with reasonable adsorptive capacity [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28]. These studies include the use of coal [29], fly ash [30], activated clay [31], palm-fruit bunch [32], bagasse pith [33], cellulose based waste [34], peat, bentonite, slag and fly ash [35], activated sludge [36], rice husk and gram husk [37][38][39], etc. The object of the present investigations has been to evaluate the efficiency of removal of Erythrosine using activated carbon (AC) and activated de-oiled mustard (ADM).…”