Mesoporous chitosan/activated charcoal powder and bead modified in 1‐butyl‐3‐methylimidazolium acetate for the adsorption of acid blue 25 from an aqueous solution

Ismaila Olalekan Saheed ◽  
Wen‐Da Oh ◽  
Ahmad Faiz Abdul Latip ◽  
Faiz Bukhari Mohd Suah
2020 ◽  
Zeinab Ghorbani

This study aimed to investigate the efficiency of the electro-persulfate process in removing acid blue 25 from aqueous solution. In order to optimize the parameters, the OFAT method was used, and the effect of three main parameters, including pH, sodium persulfate salt concentration, and current intensity was investigated. According to the results, the optimal removal efficiency of 94% in 60 minutes was obtained under conditions of pH=5, the initial concentration of sodium persulfate=250 mg / L, and the current=500 mA. According to the results of this study, the electro-persulfate process sulfate process can be an efficient process for dye removal from industrial effluents.

2016 ◽  
Vol 73 (9) ◽  
pp. 2211-2221 ◽  
Najoua Ben Douissa ◽  
Sonia Dridi-Dhaouadi ◽  
Mohamed Farouk Mhenni

Extracted cellulose from Posidonia oceanica was used as an adsorbent for removal of a cationic (Basic blue 9, BB) and anionic textile dye (Acid blue 25, AB) from aqueous solution in single dye system. Characterization of the extracted cellulose and extracted cellulose-dye systems were performed using several techniques such as Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, zeta potential and Boehm acid–base titration method. Adsorption tests showed that the extracted cellulose presented higher adsorption of BB than AB in single dye system, revealing that electrostatic interactions are responsible, in the first instance, for the dye–adsorbent interaction. In single dye systems, the extracted cellulose presented the maximum adsorption capacities of BB and AB at 0.955 mmol.g−1 and 0.370 mmol.g−1, respectively. Adsorption experiments of AB dye on extracted cellulose saturated by BB dye exhibited the release of the latter dye from the sorbent which lead to dye–dye interaction in aqueous solution due to electrostatic attraction between both species. Interaction of BB and AB dyes were investigated using spectrophotometric analysis and results demonstrated the formation of a molecular complex detected at wavelengths 510 and 705 nm when anionic (AB) and cationic (BB) dye were taken in equimolar proportions. The adsorption isotherm of AB, taking into account the dye–dye interaction was investigated and showed that BB dye was released proportionately by AB equilibrium concentration. It was also observed that AB adsorption is widely enhanced when the formation of the molecular complex is disadvantaged.

2020 ◽  
Zeinab Ghorbani

The purpose of this study was to compare the performance of Fe2+ activated persulfate and electro-persulfate process in Acid Blue 25 removal from aqueous solution. For this reason, the effects of different parameters including pH, dye, sodium persulfate and ferrous sulfate concentrations were investigated. The removal efficiency of 92% at the time of 60 min was obtained at pH= 3, dye concentration= 50 mg/L, sodium persulfate concentration= 500 mg/L and Fe (II) sulfate concentration= 100 mg/L for Fe2+ activated persulfate system and the removal efficiency of 95% at pH= 5, dye concentration = 200 mg/L, sodium persulfate concentration = 500 mg/L and ferrous sulfate concentration = 100 mg/L for electro-persulfate system by means of graphite materials as the neutral electrodes. COD removal efficiency in Fe2+ activated persulfate and electro-persulfate in the mentioned conditions were 90% and 89% in 180 minutes, respectively. Moreover, the result of process kinetics showed that using electrochemical process improved the reaction velocity from 0.0016 to 0.0487 mg/L/min. The comparison between these two-process showed that using electrochemical process improved dye removal efficiency by 4 times.

2020 ◽  
Vol 269 ◽  
pp. 116568
Merat Ghanei ◽  
Abosaeed Rashidi ◽  
Habib-Allah Tayebi ◽  
Mohammad Esmail Yazdanshenas ◽  
Hamid Rezainejad

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
L. Sivarama Krishna ◽  
A. Sreenath Reddy ◽  
W. Y. Wan Zuhairi ◽  
M. R. Taha ◽  
A. Varada Reddy

Indian jujuba seed powder (IJSP) has been investigated as a low-cost and an eco-friendly biosorbent, prepared for the removal of Acid Blue 25 (AB25) from aqueous solution. The prepared biomaterial was characterized by using FTIR and scanning electron microscopic studies. The effect of operation variables, such as IJSP dosage, contact time, concentration, pH, and temperature on the removal of AB25 was investigated, using batch biosorption technique. Removal efficiency increased with increase of IJSP dosage but decreased with increase of temperature. The equilibrium data were analyzed by the Langmuir and the Freundlich isotherm models. The data fitted well with the Langmuir model with a maximum biosorption capacity of 54.95 mg g−1. The pseudo-second-order kinetics was the best for the biosorption of AB25 by IJSP, with good correlation. Thermodynamic parameters such as standard free energy change (ΔG0), standard enthalpy changes (ΔH0), and standard entropy changes (ΔS0) were analyzed. The removal of AB25 from aqueous solution by IJSP was a spontaneous and exothermic adsorption process. The results suggest that IJSP is a potential low-cost and an eco-friendly biosorbent for the AB25 removal from synthetic AB25 wastewater.

Ensan Waatriah ES Shahrin ◽  
Nur Alimatul Hakimah Narudin ◽  
Kanya Maharani Padmosoedarso ◽  
Eny Kusrini ◽  
Abdul Hanif Mahadi ◽  

2019 ◽  
Vol 150 ◽  
pp. 348-360 ◽  
L. Sivarama Krishna ◽  
K. Soontarapa ◽  
Nabel Kalel Asmel ◽  
Mohammad Alamgir Kabir ◽  
Ali Yuzir ◽  

2018 ◽  
Vol 8 (2) ◽  
Muhammad Raziq Rahimi Kooh ◽  
Muhammad Khairud Dahri ◽  
Linda B. L. Lim ◽  
Lee Hoon Lim ◽  
Chin Mei Chan

2014 ◽  
Vol 45 (6) ◽  
pp. 2926-2934 ◽  
Ehsan Daneshvar ◽  
Mohammad Salar Sohrabi ◽  
Masoud Kousha ◽  
Amit Bhatnagar ◽  
Bahar Aliakbarian ◽  

2020 ◽  
Vol 174 ◽  
pp. 400-413
Taznur Ahmed ◽  
Abdul Matin Ali ◽  
Susmita Sen Gupta

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