Super and Selective Adsorption of Cationic Dyes onto Carboxylate-Modified Passion Fruit Peel Biosorbent

The carboxylate-functionalized passion fruit peel (PFPCS) was an efficient and rapid biosorbent for wastewater treatment. The PFPCS exhibited excellent selectivity to the cationic dyes, where the maximum adsorption capacities for methylene blue (MB) and methyl violet (MV) were 1,775.76 mg g−1 and 3,756.33 mg g−1, respectively. And the adsorption process of MB and MV on PFPCS reached equilibrium within 20 min. Moreover, the adsorption conditions and mechanisms were investigated. The adsorption process was in good agreement with the pseudo-second-order and Langmuir isotherm models. The adsorption mechanism was also proposed to be electrostatic interaction and hydrogen bond. After six cycles of desorption-adsorption, the removal efficient of MB and MV could be kept above 95%. Thus, PFPCS was considered as a highly efficient absorbent for removing cationic dyes from polluted water due to excellent adsorption characteristics, low cost and environmental friendliness.

Download Full-text

Selective Adsorption of CR (VI) onto Amine-Modified Passion Fruit Peel Biosorbent

Processes ◽

10.3390/pr9050790 ◽

2021 ◽

Vol 9 (5) ◽

pp. 790

Author(s):

Xiaolei Zhao ◽

Junli Zheng ◽

Shaohong You ◽

Chongmin Liu ◽

Linlin Du ◽

...

Keyword(s):

Adsorption Process ◽

Ph Value ◽

Selective Adsorption ◽

Low Cost ◽

Passion Fruit ◽

World Health ◽

Fruit Peel ◽

Adsorption Performance ◽

Safe Level ◽

Ft Ir

This study aimed to prepare surface amino-riched passion fruit peel (DAPFP) by amination reaction with low-cost biomaterials and use it as a biosorbent to adsorb Cr (VI). The specific physicochemical and structural properties of DAPFP were characterized by SEM, EDS, XRD, TG, Zeta, XPS, and FT-IR. The effects of pH value, initial concentration, adsorption time, coexisting ions, and temperature on the adsorption of Cr (VI) were systematically investigated. The results showed that within 90 min, DAPFP could reduce the concentration of Cr (VI) solution (1 mg/L−1) to an allowable safe level of drinking water (0.05 mg/L−1) specified by the World Health Organization. The adsorption process complies with pseudo-second-order kinetics and the Langmuir isotherm model. The adsorption capacity of the prepared biosorbent could reach 675.65 mg/g−1. The results of thermodynamic studies confirmed that the adsorption process was a self-discharging heat process. DAPFP also showed good reusability; even after being used repeatedly five times, it still showed excellent adsorption performance. FT-IR and XPS analyses showed that electrostatic attraction and reduction were the main reasons for the adsorption. By virtue of its low cost and excellent adsorption performance, DAPFP has a potential practical application as an adsorbent in treating Cr (VI) containing wastewater.

Download Full-text

Removal of Cadmium(II) from Water using Modified Citrus limettioides Peels: Thermodynamic and Isotherm Studies

Asian Journal of Chemistry ◽

10.14233/ajchem.2020.22278 ◽

2019 ◽

Vol 32 (1) ◽

pp. 73-78

Author(s):

P. Janaki ◽

R. Sudha ◽

T.S. Sribharathi ◽

P. Anitha ◽

K. Poornima ◽

...

Keyword(s):

Adsorption Process ◽

Low Cost ◽

Raw Material ◽

Isotherm Models ◽

Batch Adsorption ◽

Adsorption Method ◽

Chemically Modified ◽

Adsorption Performance ◽

Monolayer Adsorption ◽

Isotherm Equations

The adsorption performance of sulphuric acid treated low cost adsorbent synthesized by using Citrus limettioides peel as an effective raw material for the removal of cadmium(II) from water. The batch adsorption method was carried out to optimize some parameters like contact time, pH and adsorbent dose. The nonlinear isotherm equations were used to calculate the different isotherm constant of five isotherm models namely Freundlich, Langmuir, Dubinin-Radushkevich, Redlich-Peterson and Sips. The Langmuir monolayer adsorption capacity of chemically modified Citrus limettioides peel was found to be 287.60 mg g-1. The negative values of ΔGº and ΔHº showed that the adsorption process is spontaneous and exothermic.

Download Full-text

Cr(VI) Sorption from Aqueous Solution: A Review

Applied Sciences ◽

10.3390/app10186477 ◽

2020 ◽

Vol 10 (18) ◽

pp. 6477

Author(s):

Angelo Fenti ◽

Simeone Chianese ◽

Pasquale Iovino ◽

Dino Musmarra ◽

Stefano Salvestrini

Keyword(s):

Electrostatic Interactions ◽

Low Cost ◽

Ease Of Use ◽

Polluted Water ◽

Critical Survey ◽

Environmental Friendliness ◽

Endothermic Process ◽

Pseudo Second Order ◽

Main Determinants ◽

Living Organisms

Hexavalent chromium (Cr(VI)) in water systems is a major hazard for living organisms, including humans. The most popular technology currently used to remove Cr(VI) from polluted water is sorption for its effectiveness, ease of use, low cost and environmental friendliness. The electrostatic interactions between chromium species and the sorbent matrix are the main determinants of Cr(VI) sorption. The pH plays a central role in the process by affecting chromium speciation and the net charge on sorbent surface. In most cases, Cr(VI) sorption is an endothermic process whose kinetics is satisfactorily described by the pseudo second-order model. A critical survey of the recent literature, however, reveals that the thermodynamic and kinetic parameters reported for Cr(VI) sorption are often incorrect and/or erroneously interpreted.

Download Full-text

Uptake of Cationic Dyes from Aqueous Solution by Biosorption onto GranularMuntingia calabura

E-Journal of Chemistry ◽

10.1155/2009/927406 ◽

2009 ◽

Vol 6 (3) ◽

pp. 737-742 ◽

Cited By ~ 4

Author(s):

T. Santhi ◽

S. Manonmani ◽

S. Ravi

Keyword(s):

Aqueous Solution ◽

Low Cost ◽

Freundlich Isotherm ◽

Cationic Dyes ◽

Isotherm Models ◽

Experimental Conditions ◽

Experimental Parameters ◽

Initial Ph ◽

Rate Kinetics ◽

Muntingia Calabura

A new, low cost, locally available biomaterial was tested for its ability to remove cationic dyes from aqueous solution. A granule prepared from a mixture of leafs, fruits and twigs ofMuntingia calaburahad been utilized as a sorbent for uptake of three cationic dyes, methylene blue (MB), methylene red (MR) and malachite green (MG). The effects of various experimental parameters (e.g.,contact time, dye concentration, adsorbent dose and pH) were investigated and optimal experimental conditions were ascertained. Above the value of initial pH 6, three dyes studied could be removed effectively. The isothermal data fitted the Langmuir and Freundlich isotherm models for all three dyes sorption. The biosorption processes followed the pseudo-first order rate kinetics. The results in this study indicated thatMuntingia calaburawas an attractive candidate for removing cationic dyes from the dye wastewater.

Download Full-text

Influence of Acid Activation of a Mixture of Illite, Koalinite, and Chlorite Clays on the Adsorption of Methyl Violet 6B Dye

Iraqi Journal of Science ◽

10.24996/ijs.2021.62.6.2 ◽

2021 ◽

pp. 1761-1778

Author(s):

Saba Adel Saed ◽

Donia Aidan

Keyword(s):

Adsorption Process ◽

Methyl Violet ◽

Isotherm Models ◽

Batch Adsorption ◽

Acid Activation ◽

Solution Ph ◽

Adsorption Method ◽

Force Microscopy ◽

Atomic Force ◽

Hoff Equation

The influence of acid activation of a mixture of illite, kaolinite, and chlorite clays collected from the area of Zorbatiya (east of Iraq) on the adsorption of methyl violet 6B (MV6B) as a cationic dye was studied. The activation was carried out by using 0.25M HCl and 0.25M . Raw and acid-activated clays were analyzed by atomic force microscopy (AFM), scanning electron microscopy (SEM), and X-ray diffraction (XRD). Batch adsorption method was used to study the adsorption of MV6B onto the raw and acid activated clays. The impacts of different factors on the adsorption process were studied, such as clay weight, agitation time, starting MV6B concentration, temperature, ionic strength, and solution pH. The adsorption process was described by using Langmuir, Freundlich, Temkin, and Dubinin- Radushkevich isotherm models. Thermodynamic parameters like were estimated based on Vanʼt Hoff equation.

Download Full-text

Effective and Simple NaOH-Modification Method to Remove Methyl Violet Dye via Ipomoea aquatica Roots

Adsorption Science & Technology ◽

10.1155/2021/5932222 ◽

2021 ◽

Vol 2021 ◽

pp. 1-12

Author(s):

Yie Chen Lu ◽

Muhammad Raziq Rahimi Kooh ◽

Linda Biaw Leng Lim ◽

Namal Priyantha

Keyword(s):

Adsorption Process ◽

Solution Treatment ◽

Methyl Violet ◽

Coefficient Of Determination ◽

Isotherm Models ◽

Batch Adsorption ◽

Maximum Adsorption Capacity ◽

Methyl Violet 2B ◽

Naoh Solution ◽

Regeneration Experiment

In this study, a simple chemical modification was applied to a sustainable and abundantly available resource, kangkong root (KR), to remove methyl violet 2B (MV) dye. The chemically modified adsorbent (NaOH-KR) was obtained using NaOH solution treatment. Batch adsorption experiments were carried out to investigate the effects of pH, ionic strength, contact time, adsorbent dosage, and initial dye concentration. A regeneration experiment was also carried out to assess the potential of reusability. The adsorption process was modelled using various kinetics and isotherm models, whereby the best-fitting models were evaluated by using the coefficient of determination ( R 2 ) and error functions. The Sips ( R 2 = 0.9714 , χ2 =0.16) and pseudo-second-order ( R 2 = 0.9996 , χ 2 = 0.007 ) models were identified to best represent the adsorption process. The Sips model predicted a maximum adsorption capacity at 551.5 mg g-1 for NaOH-KR, which is 55% improvement in performance when compared to nonmodified KR. Lastly, the regeneration experiment showed that NaOH-KR was able to maintain reasonable dye removal even after five consecutive cycles of regenerating and reusing.

Download Full-text

Aquatic plant, Ipomoea aquatica, as a potential low-cost adsorbent for the effective removal of toxic methyl violet 2B dye

Applied Water Science ◽

10.1007/s13201-020-01326-9 ◽

2020 ◽

Vol 10 (12) ◽

Author(s):

Tze Ling Kua ◽

Muhammad Raziq Rahimi Kooh ◽

Muhammad Khairud Dahri ◽

Nur Afiqah Hazirah Mohamad Zaidi ◽

YieChen Lu ◽

...

Keyword(s):

Adsorption Capacity ◽

Low Cost ◽

Methyl Violet ◽

Point Of Zero Charge ◽

Isotherm Models ◽

Batch Adsorption ◽

Maximum Adsorption Capacity ◽

Ipomoea Aquatica ◽

Effective Removal ◽

Methyl Violet 2B

AbstractIpomoea aquatica (IA) was investigated for its potential as a low-cost adsorbent to remove toxic methyl violet 2B (MV2B) dye in aqueous solutions. Optimising parameters such as the effects of contact time, medium pH and ionic strength (using NaCl, NaNO3, KCl and KNO3) were investigated. The results indicated that 150 min were sufficient for the adsorption to reach an equilibrium state and no adjustment of pH medium was necessary. Batch adsorption experiments such as adsorption isotherm, thermodynamics and kinetics were investigated and the experimental isotherm data were fitted to six isotherm models, namely Langmuir, Freundlich, Temkin, Dubinin-Radushkevich, Redlich-Peterson and Sips, with the latter being the best-fit isotherm model showing maximum adsorption capacity (qmax) of 267.9 mg g−1. Thermodynamics studies indicated adsorption of MV2B to be exothermic in nature, occurring spontaneously. The kinetics was best described by the pseudo-second-order model. Regeneration of IA pointed to its reusability, maintaining high adsorption capacity even up until Cycle 5 when treated with acid (HCl) and base (NaOH). Functional groups such as hydroxyl and amine groups which could be involved in the adsorption of MV2B were determined using FTIR spectroscopy, and the point of zero charge of IA was found to be at pH 6.81.

Download Full-text

Treatment of Cationic Dye Wastewater with Hybrid Sorbent Generated by Anionic Dye Wastewater Hybridization with Calcium Fluoride

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.652-654.1571 ◽

2013 ◽

Vol 652-654 ◽

pp. 1571-1579

Author(s):

Dan Hua Zhao ◽

Xiu Lian Zhang ◽

Wei Yin ◽

Xiao Jun Liu

Keyword(s):

Ionic Strength ◽

Calcium Fluoride ◽

Low Cost ◽

Methyl Violet ◽

Cationic Dyes ◽

Maximum Adsorption Capacity ◽

Cationic Dye ◽

Dye Wastewater ◽

Anionic Dye ◽

Hybrid Sorbent

CaF2/AG25 (CFA) hybrid sorbent formed by hybrid reaction with activated calcium fluoride of low cost and anionic dye wastewater-Acid Green 25 (AG25) was used for the treatment of cationic dye wastewater. The adsorption of two cationic dyes methyl violet (MV) and Neutral Red (NR) from aqueous solutions was examined using a batch sorption technique. The effects of time, pH, ionic strength and temperature on the adsorption were also examined. It exhibited a faster adsorption to cationic dyes and hardly affected in pH over 3.5, ionic strength low 0.04 mol/L and temperature between 20 oC and 60 oC. The adsorption behavior of the NR and MV on CFA is in good agreement with the Langmiur isotherms model with the correlation coefficients of R 0.9948 for NR and 0.9992 for MV and the maximum adsorption capacity of NR (39.22 mg/g) and MV (48.78 mg/g). Finally, this sorbent was used in treatment of two practical cationic dye wastewaters with satisfactory results.

Download Full-text

Biosorption of Cationic Dyes onto Cork Stopper Particles by Inverse Fluidized Bed

Association of Arab Universities Journal of Engineering Sciences ◽

10.33261/jaaru.2019.26.4.002 ◽

2019 ◽

Vol 26 (4) ◽

pp. 9-16

Author(s):

Israa A. Al.Joboury ◽

Shahlaa E. Ebrahime

Keyword(s):

Methylene Blue ◽

Fluidized Bed ◽

Low Cost ◽

Methyl Violet ◽

Cationic Dyes ◽

Cork Stopper ◽

Continuous Mode ◽

Biosorption Process ◽

Simulated Wastewater ◽

Inverse Fluidized Bed

In this study cork stopper particles was used as a low cost biosorbent to remove the cationic dyes (Methylene blue (MB), Malachite green (MG), and Methyl violet (MV)) from simulated wastewater. Continuous experiments were studied in a laboratory scale in inverse fluidized-bed packed with cork stopper particles for removal these dyes. A set of continuous mode experiments was carried out in inverse fluidized bed column to study the effect of flow rate (10, 15, 20 l/h), bed depth (5, 10, 15 cm), and influent concentration (10, 20, 30 mg/l) on the performance of biosorption process onto cork stopper particles. The minimum inverse fluidized velocity was calculated and it was found to be 8 ×10-5 m/s. The results indicate that cork adsorbs dyes efficiently and can be used as a low-cost alternative for the removal of cationic dyes in wastewater treatment.

Download Full-text

Orange Peel As Low-Cost Adsorbent In The Elimination Of Cd(Ii) Ions: Kinetics, Isotherm, Thermodynamic And Optimization Evaluations

10.21203/rs.3.rs-20604/v2 ◽

2020 ◽

Author(s):

Fola Temilade Akinhanmi ◽

Edwin Andrew Ofudje ◽

Idowu Abideen Adeogun ◽

Aina Peter ◽

Joseph Mayowa Ilo

Keyword(s):

Contact Time ◽

Adsorption Process ◽

Low Cost ◽

Orange Peel ◽

Polluted Water ◽

Batch Adsorption ◽

Order Kinetic ◽

Human Beings ◽

Solution Ph ◽

Adsorbent Dosage

Abstract The presence of heavy metals in polluted water is known not only to cause stern harm to marine organisms but also to terrestrial plants and animals including human beings. This research applied low-cost and environmental benign adsorbent primed from waste orange peel (OP) for the removal of Cd(II) ions from aqueous solution via batch adsorption process. The surface properties of the orange peel powder were studied using Scanning Electron Microscopy (SEM), X-ray spectroscopy (XRD) and Fourier Transform Infrared Spectroscopy (FT-IR). Operational conditions like temperature, contact time, sorbent dosage, solution pH and initial adsorbate concentration were investigated. The utmost uptake of Cd(II) ion was obtained at a contact time of 120 mins, initial metal concentration of 240 mg/L, adsorbent dosage of 0.04 g/L, temperature of 45 °C and solution pH of 5.5. Equilibrium results showed that the orange peel adsorbent has an adsorption capacity of 128.23 mg/g as obtained from the Langmuir isotherm. The adsorption kinetics data followed a pseudo-first-order kinetic model with correlation coefficient (R2) >0.9 and low standard % error values. The adsorption process was found to be endothermic in nature with enthalpy of 0.0046 kJ mol−1 and entropy of-636.865 Jmol-1K-1 respectively. Results from the optimization study indicated that higher adsorbent dosage and lower Cd(II) ion concentration increased the percentage of Cd (II) ion removal. Thus, orange peel could be used in the removal of Cd(II) ion from aqueous solutions.

Download Full-text