Characterization and application of Ti-containing mesoporous silica for dye removal with synergistic effect of coupled adsorption and photocatalytic oxidation

Review of the use of mesoporous silicas for removing dye from textile wastewater

“…There is also the possibility that a secondary pollution problem will arise because of the excessive use of chemicals (Slokar and Majcen Le Marechal 1998;Robinson et al 2001;Demirbas 2009;Huang et al 2011a). Adsorption is globally recognized as the most promising method of wastewater treatment because of its versatility, wide applicability and low cost (Demirbas 2009;Weng et al 2009;Eftekhari et al 2010;Huang et al 2011b).…”

“…(Table 8). The Langmuir model is the most appropriate one for describing adsorption in the case of MB (Huang et al 2011a) and BV-10 (Juang et al 2006) by MPSs, and Remazol Red (Asouhidou et al 2009) and MB (Chang et al 2013b) by functionalized MPSs. The adsorption of Rifazol Yellow GR, Rifazol Red BB 150 and Rifafix Yellow 3RN150H by PDDA-SBA-15 are well described by the Langmuir isotherm model (R 2 > 0.999), in which the steep increase in adsorption capacity (120, 240, 340 mg/g respectively) indicates a great affinity of the adsorbent for dyes, followed by a plateau, which indicates the maximum capacity when the monolayer is saturated (Joo et al 2009).…”

“…Also many of them are known to be toxic or carcinogenic (Crini and Badot 2008;Fatimah et al 2011). Various physical, chemical and biological techniques, such as ultrafiltration, reverse osmosis, ion exchange and adsorption on various adsorbents have been developed for removing dye from aqueous solutions (Huang et al 2011a). Chemical techniques are often expensive and the accumulation of concentrated sludge from which dye has been removed presents a disposal problem.…”

“…Various traditional adsorbents, such as zeolite, clay, activated carbon, fly ash, peat, microbial biomass and agricultural residues have been used for removing dye from wastewater. Inherent disadvantages of these materials are their low loading capacities, relatively small dye binding constants and poor selectivity (Zhuang et al 2009;Huang et al 2011a;Debnath et al 2013).…”

“…In recent years, MPSs have been used to adsorb heavy metal ions (Aguado et al 2009;Li et al 2011;Addy et al 2012;Shahbazi et al 2013;Shahbazi et al 2014), organic dyes (Pugazhenthi 2009;Qin et al 2009;Huang et al 2011a;Huang et al 2011b;Boukoussa et al 2013;Badiei et al 2014), polycyclic aromatic hydrocarbons (Choudhary and Mantri 2000;Dou et al 2011;Vidal et al 2011;Balati et al 2014) and other organic pollutants and the results indicate that the MPSs have excellent adsorption ability (Kim et al…”