Removal of Orange-G and Methyl Violet dyes by adsorption onto bagasse fly ash—kinetic study and equilibrium isotherm analyses

Adsorption of C.I. Acid Red 97 dye from aqueous solution onto walnut shell: kinetics, thermodynamics parameters, isotherms

“…where C e is the equilibrium dye concentration (mg/L), W is the adsorbent mass (g) and V is the volume of the solution (L) (Mall et al 2006).…”

“…It is in accordance with the Langmuir equation at low concentration and is close to the Fruendlich model at high concentration (Senthil Kumar et al 2010). In addition, the Redlich-Peterson equation adds three parameters into an empirical isotherm and, consequently, can be utilized both in homogenous or in heterogeneous systems because of the high versatility of the equation (Mall et al 2006). The equation is given as:…”

“…Moreover, these dyes can be toxic and hazardous and cause mutation for watery organisms (Dogan et al 2009). Cationic (basic dyes), anionic (direct, acid and reactive dyes) and nonionic (disperse) are three types of dyes (Mall et al 2006). Over 50 % of all textile dyes utilized in the industries are azo dyes (Behnajady et al 2006).…”

Synthesis and characterization of SnO2/(NH4)2‐SnCl6 nanocomposites loaded on activated carbon and its application for adsorption of methylene Blue and Orange G

“…This results is explained by the fact that following adsorption of first layer of charged dyes on adsorbent and formation of semi-capacitor, hinder form more layer adsorption via repulsive force among layer [43] The effect of isotherm shape has been discussed with a view to predict whether an adsorption system is favorable or unfavorable which in Langmuir isotherm represent by R L value to separation factor or equilibrium parameter. [44] The i.e., whether the process is unfavorable (R L > 1), or linear (R L = 1), or favorable (0 < R L < 1), or irreversible (R L = 0) and as results show R L values were in the range of 0 < R L < 1 (Table 4) which support high efficiency of this model for [48] Activated Carbon (walnut shells) MB 315.0 1440 [49] CuO-Nanoparticles Loaded on Activated Carbon MB 10.55 15 [50] PDA microspheres MB 90.70 100 [51] MWCNTs filled with Fe 2 O 3 particles MB 42.90 60 [52] Ag-Nanoparticles Loaded on Activated Carbon MB 71.43 15 [21] Humic Acid-coated Fe 3 O 4 -NP (HA-Fe 3 O 4 ) MB 93.08 27 [53] Activated Carbon of Thespesia Populnea Pods OG 9.120 180 [54] Bagasse Fly Ash OG 18.79 240 [10] explanation of data in single (MB and OG) and binary system (MB-OG) on the SnO 2 /(NH 4 ) 2 -SnCl 6 -NCs-AC. Freundlich parameters (K F and n) indicate whether the nature of sorption is either favorable or unfavorable and accordingly 1 < n < 10 imply favorable sorption and its value closer to 1 suggest more uniform adsorbent.…”

“…These difficulties and hazardous make an urgent focus and emphasis in the researchers to develop new, safe and clean, economic and short time to able for their removal from water resource. [7,8] Azo dyes such as orange G (OG) which generally contain one or more azo groups (−N = N-) bound to aromatic rings are the largest and most important synthetic organic dyes [9,10] group, while they have chemical stability and versatility. [11] Because of their non-degradability, toxicity, potential mutagenicity and carcinogenicity, wastewaters originating from these dyes production pose major threat to the surrounding ecosystems and human beings' health.…”