Kinetic, thermodynamic and equilibrium studies on removal of hexavalent chromium from aqueous solutions using agro-waste biomaterials, casuarina equisetifolia L. and sorghum bicolor

2016 ◽  
Vol 33 (8) ◽  
pp. 2374-2383 ◽  
Author(s):  
Mokkapati Ramya Prasanthi ◽  
Mokkapati Jayasravanthi ◽  
Ratnakaram Venkata Nadh
Keyword(s):  
Aqueous Solutions ◽  
Sorghum Bicolor ◽  
Hexavalent Chromium ◽  
Casuarina Equisetifolia ◽  
Equilibrium Studies

Adsorption characteristics of modified sand for the removal of hexavalent chromium ions from aqueous solutions: Kinetic, thermodynamic and equilibrium studies

CATENA ◽  
2013 ◽  
Vol 100 ◽  
pp. 120-127 ◽  
Author(s):  
Sandeep Yadav ◽  
Varsha Srivastava ◽  
Sushmita Banerjee ◽  
Chih-Huang Weng ◽  
Yogesh C. Sharma
Keyword(s):  
Aqueous Solutions ◽  
Hexavalent Chromium ◽  
Equilibrium Studies ◽  
Adsorption Characteristics ◽  
Chromium Ions

Ouricuri (Syagrus coronata) fiber: a novel biosorbent to remove methylene blue from aqueous solutions

2016 ◽  
Vol 75 (1) ◽  
pp. 106-114 ◽  
Author(s):  
Lucas Meili ◽  
Társila Santos da Silva ◽  
Daniely Carlos Henrique ◽  
João Inácio Soletti ◽  
Sandra Helena Vieira de Carvalho ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Experimental Design ◽  
Aqueous Solutions ◽  
Adsorption Capacity ◽  
Adsorption Process ◽  
Fiber Diameter ◽  
Aqueous Media ◽  
Process Efficiency ◽  
Maximum Adsorption Capacity ◽  
Equilibrium Studies

In this work, the potential of ouricuri (Syagrus coronata) fiber as a novel biosorbent to remove methylene blue (MB) from aqueous solutions was investigated. The fiber was prepared and characterized according to the fundamental features for adsorption. A 23 experimental design was used to evaluate the effects of adsorbent dosage (M), fiber diameter (D) and agitation (A) on the adsorption capacity. In the more adequate conditions, kinetic and equilibrium studies were performed. The experimental design results showed that M = 10 g L−1), D = 0.595 mm and A = 200 rpm were the more adequate conditions for MB adsorption. Based on the kinetic study, it was found that the adsorption process was fast, being the equilibrium was attained at about 5 min, with 90% of color removal. The isotherm was properly represented by the Sips model, and the maximum adsorption capacity was 31.7 mg g−1. In brief, it was demonstrated that ouricuri fiber is an alternative biosorbent to remove MB from aqueous media, taking into account the process efficiency and economic viewpoint.

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