scholarly journals Cr(VI) Sorption from Aqueous Solution: A Review

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.

scholarly journals Kinetics and isotherm modeling of Pb(II) and Cd(II) sequestration from polluted water onto tropical ultisol obtained from Enugu Nigeria

2021 ◽  
Vol 11 (4) ◽  
Author(s):  
Theresa C. Umeh ◽  
John K. Nduka ◽  
Kovo G. Akpomie
Keyword(s):  
Metal Ions ◽  
Low Cost ◽  
Water Environment ◽  
Standard Technique ◽  
Soil Surface ◽  
Cost Effective ◽  
Polluted Water ◽  
Batch Adsorption ◽  
Lead And Cadmium ◽  
Pseudo Second Order

AbstractDeterioration in soil–water environment severely contributed by heavy metal bioavailability and mobility on soil surface and sub-surface due to irrational increase in wastewater discharge and agrochemical activities. Therefore, the feasibility of adsorption characteristics of the soil is paramount in curbing the problem of micropollutant contamination in the farming vicinity. Soil from a farming site in a populated area in Enugu, Nigeria was collected and tested to measure the lead and cadmium contents using atomic absorption spectrophotometer (AAS). The adsorption potency of the ultisol soil was estimated for identifiable physicochemical properties by standard technique. The mean activity concentration of Pb2+ and Cd2+ was 15.68 mg/kg and 3.01 mg/kg. The pH, temperature, metal concentration and contact time adsorptive effect on the Pb2+ and Cd2+ uptake was evaluated by batch adsorption technique. The Langmuir, Freundlich and Temkin models were fitted into equilibrium adsorption data and the calculated results depict a better and satisfactory correlation for Langmuir with higher linear regression coefficients (Pb2+, 0.935 and Cd2+, 0.971). On the basis of sorption capacity mechanism of the soil, pseudo-second-order model best described the kinetics of both metal ions retention process. The results of the present study indicated that the soil being a low cost-effective adsorbent can be utilized to minimize the environmental risk impact of these metal ions.

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

2021 ◽  
Vol 9 ◽  
Author(s):  
Kaiwei Chen ◽  
Linlin Du ◽  
Peng Gao ◽  
Junli Zheng ◽  
Yuanli Liu ◽  
...  
Keyword(s):  
Adsorption Process ◽  
Selective Adsorption ◽  
Low Cost ◽  
Methyl Violet ◽  
Passion Fruit ◽  
Cationic Dyes ◽  
Polluted Water ◽  
Isotherm Models ◽  
Fruit Peel ◽  
Environmental Friendliness

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.

Utilization of Jackfruit Peel as a Low-Cost adsorbent for the Removal of Methylene Blue Dye from Synthetically Polluted Water

2020 ◽  
Vol 16 ◽  
Author(s):  
Mohsina Ahmed ◽  
Abu Nasar
Keyword(s):  
Methylene Blue ◽  
Low Cost ◽  
Aqueous Media ◽  
Polluted Water ◽  
Blue Dye ◽  
Batch Adsorption ◽  
Contaminated Water ◽  
Abrupt Increase ◽  
Agriculture Waste ◽  
Pseudo Second Order

Background: Due to an abrupt increase in the contamination of freshwater systems by dye-containing wastewater, there is an urgent need to find robust and greener adsorbents for the elimination of dyes from the contaminated water. As the dyes not only change the appearance of water but are also a cause of many serious problems, which can be some time mutagenic and carcinogenic. Methods: This research paper is based on the use of adsorbent made from the peel of jackfruit (POJ). The adsorbent derived from agriculture waste was low cost and efficient for the elimination of methylene blue (MB) dye from aqueous media. Batch adsorption experiments were accompanied by varying the pH of the solution, contact time, POJ dosage, and initial MB concentration. Results: It was seen that adsorption of MB onto Jackfruit peel adsorbent follows pseudo-second-order (PSO) kinetics and Langmuir isotherm with maximum biosorption capacity (qm) of 232.55 mg/g. The thermodynamic study revealed that the adsorption was spontaneous, endothermic, and associated with the rise in entropy. Conclusion: In view of the low-cost and promising adsorption efficiency, the present investigation submits that that POJ is novel and economically feasible adsorbent for the removal of MB from aqueous solutions.

scholarly journals Syringa vulgaris leaves powder a novel low-cost adsorbent for methylene blue removal: isotherms, kinetics, thermodynamic and optimization by Taguchi method

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Giannin Mosoarca ◽  
Cosmin Vancea ◽  
Simona Popa ◽  
Marius Gheju ◽  
Sorina Boran
Keyword(s):  
Methylene Blue ◽  
Low Cost ◽  
Dye Adsorption ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Adsorbent Surface ◽  
Order Kinetic Model ◽  
Endothermic Process ◽  
Pseudo Second Order ◽  
Better Than

Abstract In this study, the potential of a new low-cost adsorbent, Syringa vulgaris leaves powder, for methylene blue adsorption from aqueous solution was investigated. The adsorbent surface was examined using SEM and FTIR techniques. The experiments were conducted, in batch system, to find out the effect of pH, contact time, adsorbent dose, initial dye concentration, temperature and ionic strength on dye adsorption. The process is best described by Langmuir isotherm and the pseudo second order kinetic model. Maximum adsorption capacity, 188.2 (mg g−1), is better than other similar adsorbent materials. Thermodynamic parameters revealed a spontaneous and endothermic process, suggesting a physisorption mechanism. A Taguchi orthogonal array (L27) experimental design was used to determine the optimum conditions for the removal of dye. Various desorbing agents were used to investigate the regeneration possibility of used adsorbent. Results suggest that the adsorbent material is very effective for removal of methylene blue from aqueous solutions.

Exclusion of Organic Dye Using Neoteric Activated Carbon Prepared from Cornulaca monacantha Stem: Equilibrium and Thermodynamics Studies

2016 ◽  
Vol 875 ◽  
pp. 1-15 ◽  
Author(s):  
Arush Sharma ◽  
Gaurav Sharma ◽  
Amit Kumar ◽  
Zia Mahmood Siddiqi ◽  
Gaurav Sharma
Keyword(s):  
Activated Carbon ◽  
Malachite Green ◽  
Low Cost ◽  
Entropy Change ◽  
Sorption Process ◽  
Second Order ◽  
Adsorption Parameters ◽  
Malachite Green Dye ◽  
Endothermic Process ◽  
Pseudo Second Order

In this study, Cornulacamonacantha stem (CMS) has been used for the preparation of highly competent, ecofriendly and low-cost activated carbon (CMSAC) biosorbent. It was characterized by some instrumental techniques such as Fourier transform infrared spectroscopy (FTIR) and scanning electron microscope (SEM). The biosorbent was evaluated for the eradication of hazardous malachite green (MG) dye from aqueous solution. Batch experiments were conducted to assess the effect of various adsorption parameters such initial dye concentration, sorbent dosage, pH, agitation time and temperature. The results indicated that maximum sorption of MG was occurred at the pH ranged from 10.0 to 12.0. Langmuir, Freundlich and Tempkin isotherms were applied for the interpretation of experimental data and Langmuir model was found to be strongly fitted with higher R2 (0.999). The kinetics studies were examined using pseudo-first-order, pseudo-second-order, Elovich model. The sorption process was described by pseudo-second-order kinetics. The thermodynamic parameters such as energy change (ΔG°), enthalpychange (ΔH°) and entropy change (ΔS°) were found to be-6.21kJ/mol, 46.17 kJ/mol and 172.81 J/mol/K, respectively. The adsorption performance of malachite green dye onto gleaming activated carbon developed from Cornulacamonacantha stem was found to be spontaneous, feasible and endothermic process.

scholarly journals Bacterial Template Synthesis of Multifunctional Nanospindles for Glutathione Detection and Enhanced Cancer-Specific Chemo-Chemodynamic Therapy

Research ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-15 ◽  
Author(s):  
Yan-Wen Bao ◽  
Xian-Wu Hua ◽  
Jia Zeng ◽  
Fu-Gen Wu
Keyword(s):  
Limit Of Detection ◽  
Low Cost ◽  
Synthetic Methods ◽  
Reaction Conditions ◽  
Environmental Friendliness ◽  
Disinfection Process ◽  
Living Organisms ◽  
Inhibition Performance ◽  
First Time ◽  
Tumor Eradication

Biological synthetic methods of nanoparticles have shown great advantages, such as environmental friendliness, low cost, mild reaction conditions, and enhanced biocompatibility and stability of products. Bacteria, as one of the most important living organisms, have been utilized as bioreducing nanofactories to biosynthesize many metal nanoparticles or compounds. Here, inspired by the disinfection process of KMnO4, we for the first time introduce bacteria as both the template and the reducing agent to construct a novel tumor microenvironment-responsive MnOx-based nanoplatform for biomedical applications in various aspects. It is found that the bacterium/MnOx-based nanospindles (EM NSs) can efficiently encapsulate the chemotherapeutic agent doxorubicin (DOX), leading to the fluorescence quenching of the drug. The as-formed DOX-loaded EM NSs (EMD NSs) are proven to be decomposed by glutathione (GSH) and can simultaneously release DOX and Mn2+ ions. The former can be utilized for sensitive fluorescence-based GSH sensing with a limit of detection as low as 0.28 μM and selective cancer therapy, while the latter plays important roles in GSH-activated magnetic resonance imaging and chemodynamic therapy. We also demonstrate that these nanospindles can generate oxygen in the presence of endogenous hydrogen peroxide to inhibit P-glycoprotein expression under hypoxia and can achieve excellent tumor eradication and tumor metastasis inhibition performance. Taken together, this work designs a multifunctional bacterially synthesized nanomissile for imaging-guided tumor-specific chemo-chemodynamic combination therapy and will have implications for the design of microorganism-derived smart nanomedicines.

New Class of Flocculants and Coagulants

2021 ◽  
pp. 219-252
Keyword(s):  
Wastewater Treatment ◽  
Industrial Wastewater ◽  
Low Cost ◽  
Treatment Method ◽  
Ease Of Use ◽  
Natural Polymers ◽  
Environmental Friendliness ◽  
Industrial Wastewater Treatment ◽  
New Class ◽  
Flocculation Efficiency

Coagulation is a kind of efficient water treatment method commonly used in domestic anhydrous and industrial wastewater treatment. Inorganic polymer coagulants (polyvalent metal salts) are widely used because of their low cost and ease of use. However, due to the low flocculation effectiveness and the presence of residual metal concentrations in the treated water, their application is limited. Organic synthetic flocculant has been widely used due to its higher flocculation efficiency at lower dosage. However, it has limitations in applicability due to its molecular structure which is less biodegradable and less disperse in water. Therefore, flocculants based on natural polymers have attracted extensive attention from researchers due to their advantages such as biodegradability and environmental friendliness. This paper summarizes the overview of the development of various types of flocculants that were used for industrial wastewater treatment. In addition, the characteristics and application of flocculant is reviewed with their behavior.

New Class of Flocculants and Coagulants

2021 ◽  
pp. 219-252
Keyword(s):  
Wastewater Treatment ◽  
Industrial Wastewater ◽  
Low Cost ◽  
Treatment Method ◽  
Ease Of Use ◽  
Natural Polymers ◽  
Environmental Friendliness ◽  
Industrial Wastewater Treatment ◽  
New Class ◽  
Flocculation Efficiency

Coagulation is a kind of efficient water treatment method commonly used in domestic anhydrous and industrial wastewater treatment. Inorganic polymer coagulants (polyvalent metal salts) are widely used because of their low cost and ease of use. However, due to the low flocculation effectiveness and the presence of residual metal concentrations in the treated water, their application is limited. Organic synthetic flocculant has been widely used due to its higher flocculation efficiency at lower dosage. However, it has limitations in applicability due to its molecular structure which is less biodegradable and less disperse in water. Therefore, flocculants based on natural polymers have attracted extensive attention from researchers due to their advantages such as biodegradability and environmental friendliness. This paper summarizes the overview of the development of various types of flocculants that were used for industrial wastewater treatment. In addition, the characteristics and application of flocculant is reviewed with their behavior.

scholarly journals Utilization of treated coffee husk as low-cost bio-sorbent for adsorption of methylene blue

2020 ◽  
Vol 38 (5-6) ◽  
pp. 205-222 ◽  
Author(s):  
Adane Adugna Ayalew ◽  
Tadele Assefa Aragaw
Keyword(s):  
Methylene Blue ◽  
High Efficiency ◽  
Low Cost ◽  
Chemical Activation ◽  
Cost Effective ◽  
Coffee Husk ◽  
Equilibrium Data ◽  
Endothermic Process ◽  
Pseudo Second Order ◽  
Maximum Removal

Dyes and pigments have been used in many industries for colorization purpose but they pose hazards to the environment and end users of water. Therefore, it is important to remove this pollutant from waste water before their final disposal. This study aimed to investigate the removal of methylene blue by cost effective, ecofriendly, high-efficiency bio-sorbent from activated coffee husk. The process was carried out using chemical activation (H3PO4) process. Fourier transform infrared spectroscopy and surface analyzer (Brunauer-Emmett-Teller) were used to characterize the adsorbent. The specific surface area adsorbent was obtained as 28.54 m2/g. The maximum removal efficiency was obtained as 96.9% at pH of 5, initial dye concentration of 20 mg/L, adsorbent dosage of 0.8 g/50 mL, for contact time of 50 min and 30°C temperature on the activation surface of coffee husk. Langmuir model was found to fit the equilibrium data for methylene blue adsorption with 6.82 mg/g at 30°C. The adsorption process follows the pseudo-second-order model. Thermodynamics analysis showed that the adsorption of methylene blue on to the activated coffee husk was a spontaneous and endothermic process. The experimental data obtained in the present study proved that coffee husk is a suitable bio-sorbent in removal of cationic dyes.

scholarly journals Modification of Corn stalk for high-performance adsorption of Coomassie Brilliant blue dye in simulated polluted water: Kinetic study

2021 ◽  
Keyword(s):  
High Performance ◽  
Magnetic Particles ◽  
Low Cost ◽  
Polluted Water ◽  
Blue Dye ◽  
Time Interval ◽  
Corn Stalk ◽  
Order Model ◽  
Pseudo Second Order ◽  
Coomassie Brilliant

<p>In the present work, corn stalk was used as a low cost adsorbent for removal of anionic dye (" CBB"). Corn stalk was treated with two methods to inform Modified corn stalk with magnetic particles (MMCS) and Modified corn stalk with sulfuric acid (SMCS). Comparison between raw and treated corn stalk in dye removal was done. The effect of various parameters as dye concentration (5 to 25 mg/L), particle size (4 mm-125 µm), adsorbent dose (1 to 10 g/L), shaking rate (100 to 250 rpm) , Temperature (15 to 45̊ C) and pH (3 to 11) was investigated versus time interval. The results summarize that the highest % removal of dye 85 % by using raw corn stalk followed by SMCS about 80% and 50% for MMCS. Different kinetic models were applied, the results suggested that adsorption of CBB dye for raw and treated corn stalk follows the pseudo second order model</p>

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