Starch, cellulose, pectin, gum, alginate, chitin and chitosan derived (nano)materials for sustainable water treatment: A review

Tackling environmental challenges in pollution controls using artificial intelligence: A review

Adsorption of cationic dyes, drugs and metal from aqueous solutions using a polymer composite of magnetic/β-cyclodextrin/activated charcoal/Na alginate: Isotherm, kinetics and regeneration studies.

Modeling of simultaneous adsorption of dye and metal ion by sawdust from aqueous solution using of ANN and ANFIS

Effective and fast adsorptive removal of toxic cationic dye (MB) from aqueous medium using amino-functionalized magnetic multiwall carbon nanotubes

The adsorption of methylene blue dye (MBD) from aqueous solutions was investigated using a new composite made up of shrimp waste chitosan and zeolite as adsorbent. Response surface methodology (RSM) was used to optimize the effects of process variables, such as contact time, pH, adsorbent dose and initial MBD concentration on dye removal. The results showed that optimum conditions for removal of MBD were adsorbent dose of 2.5 g/L and pH of 9.0, and initial MBD concentration of 43.75 mg/L and contact time of 138.65 min. The initial concentration of dye had the greatest influence on MBD adsorption among other variables. The experimental data were well fitted by the pseudo-second order kinetic model, while the Freundlich isotherm model indicated a good ability for describing equilibrium data. According to this isotherm model, maximum adsorption capacity of the composite was 24.5 mg/g. Desorption studies showed that the desorption process is favored at low pH under acidic conditions.

Removal of methylene blue dye from aqueous solutions by a new chitosan/zeolite composite from shrimp waste: Kinetic and equilibrium study

Adsorption of tetracycline antibiotic onto modified zeolite: Experimental investigation and modeling.

Background and Aims: Antibiotics are potential pollutants that their disposal and release into the environment and especially aqueous solutions may result in serious problems. Owing to the high toxicity and low biodegradability of these compounds, their residuals mayhave adverse effects on human health andother organisms. In this study, the removal of ciprofloxacin by chitosan composite/zeolite was investigated.Materials and Methods: The effect of various parameters including initial concentration of antibiotic, solution pH, adsorbent dosage, and contact time on the process was studied.The design expert software and response surface methodology were used to investigate the effects of operating variables and optimizationconditions. Kinetic and adsorption isotherm studies were done and physical and structural features were determined using SEM, FT-IR and pHpzc. In carrying out this study and the use of resources, ethical issues were all considered.Results: The maximum removal efficacy of ciprofloxacin (97.5%) was at initial concentration 5mg/L, pH 7, adsorbent dosage2 g/L, and contact time 37.5 min. The initial concentration of ciprofloxacin and adsorbent dosage were most effective parameters on the removal efficiency. Adsorption isotherm studiesrevealed that the experimental data best fitted to the Langmuir isotherm model (R2=0.9995). Kinetic studies identified second order model as a suitable model for description of adsorption process(R2= 9973).Conclusion: The present study showed that the adsorption process by chitosan / zeolite composite as a suitable adsorbent can be a cost effective and good alternative to remove antibiotics from aqueous solutions. Keywords: Ciprofloxacin, Adsorption, Chitosan/Zeolite, Aqueous solutions, Response SurfaceMethodology

The efficacy of ciprofloxacin removal by Chitosan/Zeolite composite from aqueous solution:Response surface methodology, kinetic and isotherm studies

Background and Objectives: Nitrate contamination of surface and groundwater is considered as one of the more serious problems in throughout the world. High nitrate concentration in water (higher than standards) is very dangerous, consuming such polluted water can lead to Methemoglobinemia disease in children and the formation of the carcinogenic nitrosamines in adults. . The aim of this study was to investigate the possibility using of Modified clinoptilolite Zeolite by Cationic Surfactants adsorbent in nitrate removal from aqueous solutions. Materials and Methods: In this empirical study, the effects of different independent variables including adsorbent dose (1-3 g/l), initial concentration of nitrate (50-150 mg/l), pH (4-10) and contact time (15-120 min) on elimination of nitrate was investigated. Also, adsorption kinetic along with Langmuir and Freundlich isotherms was studied. Results: The obtained results showed that the maximum removal efficiency of NO3 was in the initial nitrate concentration of 50 mg/L, pH of 4, adsorbent dose of 3 g/l, and contact time of 90 min. Also, the results indicate that the nitrate adsorption by modified Clinoptilolite zeolite was fitted well with Freundlich isotherm (R2=0.9951), and second- order kinetics (R2=0.9998). Conclusion: According to the attained results, the Clinoptilolite zeolite can be considered as an appropriate and economical adsorbent for elimination of nitrate from aqueous solutions. Concerning its simple modification method and low cost, it can be applied as an adsorbent for other anionic pollutions. .

Marjan Mehrabpour

Papers

Modeling of simultaneous adsorption of dye and metal ion by sawdust from aqueous solution using of ANN and ANFIS

Removal of methylene blue dye from aqueous solutions by a new chitosan/zeolite composite from shrimp waste: Kinetic and equilibrium study

Adsorption of tetracycline antibiotic onto modified zeolite: Experimental investigation and modeling.

The efficacy of ciprofloxacin removal by Chitosan/Zeolite composite from aqueous solution:Response surface methodology, kinetic and isotherm studies

Evaluation of Clinoptilolite Modified by Cationic Surfactant for Nitrate Removal from Aqueous Solutions