scholarly journals Biomass-Based Cellulose Functionalized by Phosphonic Acid with High Selectivity and Capacity for Capturing U(VI) in Aqueous Solution

2020 ◽  
Vol 10 (16) ◽  
pp. 5455
Author(s):  
Zhipeng Huo ◽  
Sheng Zhao ◽  
Jinxin Yi ◽  
Hong Zhang ◽  
Jiaxing Li
Keyword(s):  
Phosphonic Acid ◽  
Aqueous Media ◽  
Substrate Material ◽  
Batch Adsorption ◽  
Adsorption Model ◽  
Adsorption Selectivity ◽  
Synthesis Strategy ◽  
Pseudo Second Order ◽  
Phosphonic Acid Groups ◽  
Cellulose Adsorbent

Uranium could be released into the aquatic ecological environment through various sorts of nuclear-related procedures, which has high toxicity and carcinogenicity even with a trace amount. A novel phosphonic acid functionalized cellulose adsorbent (PVKAP) with a simple synthesis strategy is developed based on pumpkin vine cellulose (PVK) as the substrate material for efficient and selective capturing U(VI). Because of the strong coordination between phosphonic acid groups and U(VI), the adsorption efficiency and adsorption selectivity of modified cellulose to U(VI) are greatly improved. The adsorption behavior follows the Langmuir adsorption model and pseudo-second-order kinetics model. The maximum adsorption capacities (pH = 5, T = 293 K) of PVK and PVKAP obtained from Langmuir isotherm are 57.2 and 714.3 mg∙g−1, and the adsorption equilibrium are reached in 240 and 35 min, respectively. Additionally, PVKAP has a high adsorption selectivity which reached 70.36% for U(VI) in multi-ion condition, and recycling studies have shown that PVKAP has good recyclability. Furthermore, batch adsorption experiments and spectral analysis reveal that the efficient enrichment of U(VI) on PVKAP could mainly attribute to the inner layer complexation. Therefore, this environmentally friendly and simple route prepared PVKAP has good a potential application value for U(VI) enrichment in aqueous media related to nuclear waste.

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.

Application of black walnut (Juglans nigra) husk for the removal of lead (II) ion from aqueous solution

2017 ◽  
Vol 75 (10) ◽  
pp. 2454-2464 ◽  
Author(s):  
O. S. Lawal ◽  
O. S. Ayanda ◽  
O. O. Rabiu ◽  
K. O. Adebowale
Keyword(s):  
Aqueous Solution ◽  
Entropy Change ◽  
Second Order ◽  
Black Walnut ◽  
Juglans Nigra ◽  
Ion Concentration ◽  
Batch Adsorption ◽  
Standard Entropy ◽  
Adsorption Model ◽  
Pseudo Second Order

The biosorption characteristics of Pb (II) ions from aqueous solution using black walnut (Juglans nigra) seed husk (WSH) biomass were investigated using batch adsorption techniques. The effects of pH, contact time, initial Pb (II) ion concentration, and temperature were studied. The Langmuir, Freundlich and Temkin isotherms were used to analyze the equilibrium data. It was found that the adsorption of Pb (II) ions onto WSH was best described by the Freundlich adsorption model. Biosorption kinetics data were tested using the pseudo-first order and pseudo-second order models, and it was observed that the kinetics data fitted the pseudo-second order model. Thermodynamic parameters such as standard Gibbs free energy change (ΔG0), standard enthalpy change (ΔH0) and standard entropy change (ΔS0) were evaluated. The result showed that biosorption of Pb (II) ions onto WSH was spontaneous and endothermic in nature. The FTIR study showed that the following functional groups: O-H, C = O, C-O, C-H and N-H were involved in binding Pb (II) ions to the biomass.

scholarly journals Efficient removal of cadmium (II) ions from aqueous solution by CoFe2O4/chitosan and NiFe2O4/chitosan composites as adsorbents

2018 ◽  
Vol 78 (11) ◽  
pp. 2297-2307 ◽  
Author(s):  
Ashraf Homayonfard ◽  
Mahsasadat Miralinaghi ◽  
Reza Haji Seyed Mohammad Shirazi ◽  
Elham Moniri
Keyword(s):  
Competitive Adsorption ◽  
Aqueous Media ◽  
Batch Adsorption ◽  
Practical Application ◽  
Efficient Removal ◽  
Monolayer Adsorption ◽  
Pseudo Second Order ◽  
One Step ◽  
Study Support ◽  
Cobalt And Nickel

Abstract Magnetically recoverable chitosan based spinel cobalt and nickel ferrite (CS/CoFe2O4 and CS/NiFe2O4, respectively) composites were successfully prepared in one step. A series of batch adsorption experiments indicated that the removal of toxic Cd(II) ions by the as-obtained composites as adsorbents was pH-dependent, rapid, proficient, better fitted to pseudo-second-order kinetics model and Langmuir monolayer adsorption isotherm model. Compared to the naked particles, magnetic bio-polymer composites exhibited promoted adsorption capacity. Competitive adsorption studies in binary solutions illustrated preferable selectivity of adsorbents toward Cd(II) ions in the presence of co-existing cations. More importantly, CS/CoFe2O4 and CS/NiFe2O4 had a satisfactory practical application in the removal of Cd(II) from real groundwater spiked with cadmium. The exhausted adsorbents could be regenerated efficiently by 0.5 M HNO3. The results from this study support that CS/CoFe2O4 and CS/NiFe2O4 prove excellent adsorption behavior for the removal of Cd(II) ions from aqueous media.

scholarly journals Poly(amidoamine) dendrimer modified superparamagnetic nanoparticles as an efficient adsorbent for Cr(VI) removal: Effect of high-generation dendrimer on adsorption performance

2021 ◽  
Author(s):  
Can Cui ◽  
Yadian Xie ◽  
Jiaojiao Niu ◽  
Hailiang Hu ◽  
Sen Lin
Keyword(s):  
Adsorption Capacity ◽  
Pamam Dendrimer ◽  
Superparamagnetic Nanoparticles ◽  
Batch Adsorption ◽  
Adsorption Model ◽  
Langmuir Adsorption ◽  
Pseudo Second Order ◽  
Modified Adsorbents ◽  
Adsorption Desorption ◽  
Efficient Adsorbent

Abstract Heavy metal ions pollution is one of the most dangerous and critical threats to human health and environment. In this work, three different generations of PAMAM dendrimer decorated on magnetic Fe 3 O 4 composites (Fe 3 O 4 @SiO 2 –G1, Fe 3 O 4 @SiO 2 –G3, Fe 3 O 4 @SiO 2 –G5) were fabricated and characterized by FTIR, XRD, TEM, and TGA. The obtained composites were used for Cr(VI) removal. Batch adsorption studies showed that the adsorption reached equilibrium within 60 min, and the optimal pH was 3.0. The result of adsorption kinetics was simulated by the pseudo–second-order model. The adsorption equilibrium isotherm was well fitted with the Langmuir adsorption model. Furthermore, thermodynamics calculations revealed that the adsorption process was endothermic and spontaneous. Importantly, adsorption capacity of Cr(VI) obey the sequence of Fe 3 O 4 @SiO 2 –G1＜Fe 3 O 4 @SiO 2 –G5＜Fe 3 O 4 @SiO 2 –G3, 3 generation of PAMAM (3G) is the optimal for adsorption capacity of Cr(VI). The maximum theoretical Cr(VI) adsorption capacity ( q m ) of Fe 3 O 4 @SiO 2 –G3 was 334.45 mg/g, and removal ration remained above 89.5% after five cycles of adsorption–desorption. Thus, Fe 3 O 4 @SiO 2 –G3 is predicted to be an efficient adsorbent for the adsorption of Cr(VI) from aqueous solution, and the obtained results can help in the generation optimization during fabrication of dendrimer modified adsorbents.

Separation of Rhodamine B Dye from Aqueous Media Using Natural Pomegranate Peels

2020 ◽  
Vol 21 (1) ◽  
pp. 212
Author(s):  
Zainab Mohammad Saigl ◽  
Arwa Mohammed Ahmed
Keyword(s):  
Aqueous Media ◽  
Solution Temperature ◽  
Batch Adsorption ◽  
Maximum Adsorption Capacity ◽  
Sorption Behavior ◽  
Order Kinetic ◽  
Sorbent Surface ◽  
Dye Sorption ◽  
Pseudo Second Order ◽  
Rhodamine B Dye

Natural pomegranate peels (PPs) ground powder was proved as effective natural biomass for the separation of RhB from different aqueous media by batch adsorption experiments. Several parameters that affect the maximum adsorption capacity toward RhB dye, e.g., the pH solution, initial dye concentration, adsorbent dosage, shaking time, and solution temperature in the sorption behavior, were studied. Adsorption of RhB dye from aqueous media of pH ≈ 5 reached equilibrium in 10 min and was independent of the initial concentration of RhB. RhB dye sorption followed pseudo-second order kinetic with an overall rate constant (k2) of 0.04 g mg–1 min–1. Furthermore, the sorption isotherm was found 31.95 ± 0.02 mg g–1 for the sorption capacity of RhB onto PPs. The thermodynamic parameters (ΔH, ΔS, and ΔG) of RhB retention by the sorbent were calculated. The positive value of ΔH confirms the endothermic behavior of the adsorption of RhB by PPs from aqueous solution. The positive value of entropy (ΔS = 42.17 J mol–1 K–1) of the sorption of RhB onto the sorbent surface may be attributed to the increase in the degree of freedom of the RhB molecules is more restricted in the PPs structure than in solution.

Catalysis of the Cellulose-Cyclic Urea Reactions by Built-in Acid Groups

1971 ◽  
Vol 41 (8) ◽  
pp. 680-685 ◽  
Author(s):  
D. M. Perrier ◽  
R. R. Benerito
Keyword(s):  
Phosphonic Acid ◽  
Untreated Control ◽  
Sulfonic Acid ◽  
Aqueous Media ◽  
Strong Acid ◽  
Degree Of Substitution ◽  
Acid Form ◽  
Cure Process ◽  
Phosphonic Acid Groups ◽  
Sulfonic Acid Groups

Sulfonic acid groups in sulfonoethylated cottons act as built-in catalysts for the reaction of cotton with substituted cyclic ureas. The cotton in the acid form did not require an additional catalyst for its reaction in aqueous media with dimethylolethylene urea, dimethylolpropylene urea, dihydroxyethylene urea, and dimethyloldihydroxyethylene urea. The strong acid groups of SE-cotton were more effective than carboxylic or phosphonic acid groups of carboxymethylated and phosphonomethylated cottons of like degree of substitution with each urea. Only the dimethyloldihydroxyethylene urea was effective in a delayed-cure process which, compared to the untreated control and the SE-control, imparted improved wrinkle recovery properties.

scholarly journals Byproducts from the edible oil industry as potential adsorbent for the removal of Pregabalin from aqueous solution

2021 ◽  
Vol 12 (2) ◽  
pp. 1513-1520
Author(s):  
Chandrarao D ◽  
Rama Devi D ◽  
Vani P ◽  
Basavaiah K ◽  
Satyabalaji T ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Activated Carbons ◽  
Industrial Effluent ◽  
Cost Effective ◽  
Batch Adsorption ◽  
Maximum Adsorption Capacity ◽  
Adsorption Model ◽  
Pseudo Second Order ◽  
Initial Drug

Removal of Pregabalin from aqueous solution as well as industrial effluent using a new, efficient and cost-effective activated carbon derived from groundnut seed cake powder (GNSCP) and coconut cake powder (CCP) has been presented in this study. Experimentation has been carried out by optimizing various parameters such as pH, contact time, dosage, temperature and initial drug concentration using a batch adsorption model. Surface texture and morphology of the activated carbons have been analyzed by HR SEM; Characterization of the adsorbents has been carried out using FTIR and PXRD. Bio-sorption of Pregabalin using GNSCP and CCP followed pseudo-second-order kinetics. Langmuir adsorption isotherm suits the best for the present study. Thermodynamic studies showed that the adsorption of the drug onto the chosen adsorbents is a spontaneous and feasible process. The maximum adsorption capacity for the uptake of Pregabalin by GNSCP was found to be 9.71 mg/g and with CCP 9.83 mg/g. Suitability of the adsorbents for the treatment of industrial effluent has also been carried out and found to have 98 % removal of the drug from the effluent.

scholarly journals Structural Adaptive, Self-Separating Material for Removing Ibuprofen from Waters and Sewage

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7697
Author(s):  
Anna Maria Skwierawska ◽  
Dominika Nowacka ◽  
Paulina Nowicka ◽  
Sandra Rosa ◽  
Katarzyna Kozłowska-Tylingo
Keyword(s):  
Second Order ◽  
Isotherm Models ◽  
Batch Adsorption ◽  
Maximum Adsorption Capacity ◽  
Adsorption Model ◽  
Order Model ◽  
Scanning Calorimetry ◽  
Elementary Analysis ◽  
Pseudo Second Order ◽  
Experimental Kinetics

β-Cyclodextrin nanosponge (β−CD−M) was used for the adsorption of ibuprofen (IBU) from water and sewage. The obtained material was characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), Brunauer–Emmett–Teller (BET), Barrett–Joyner–Halenda (BJH), Harkins and Jura t-Plot, zeta potential, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and elementary analysis (EA). Batch adsorption experiments were employed to investigate the effects of the adsorbent dose, initial IBU concentration, contact time, electrolyte ions and humic acids, and sewage over adsorption efficiency. The experimental isotherms were show off using Langmuir, Freundlich, Hill, Halsey and Sips isotherm models and thermodynamic analysis. The fits of the results were estimated according to the Sips isotherm, with a maximum adsorption capacity of 86.21 mg g−1. The experimental kinetics were studied by pseudo-first-order, pseudo-second-order, Elovich, modified Freundlich, Weber Morris, Bangham’s pore diffusion, and liquid film diffusion models. The performed experiments revealed that the adsorption process fits perfectly to the pseudo-second-order model. The Elovich and Freundlich models indicate chemisorption, and the kinetic adsorption model itself is complex. The data obtained throughout the study prove that this nanosponge (NS) is extremely stable, self-separating, and adjusting to the guest structure. It also represents a potential biodegradable adsorbent for the removal IBU from wastewaters.

Utilisation of Biomass and Hybrid Biochar from Elephant Grass and Low Density Polyethylene for the Competitive Adsorption of Pb(II), Cu(II), Fe(II) and Zn(II) from Aqueous Media

2020 ◽  
Vol 13 ◽  
Author(s):  
Joshua O. Ighalo ◽  
Lois T. Arowoyele ◽  
Samuel Ogunniyi ◽  
Comfort A. Adeyanju ◽  
Folasade M. Oladipo-Emmanuel ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Removal Efficiency ◽  
Contact Time ◽  
Competitive Adsorption ◽  
Adsorption Process ◽  
Aqueous Media ◽  
Polluted Water ◽  
Batch Adsorption ◽  
Order Kinetic ◽  
Elephant Grass

Background: The presence of pollutants in polluted water is not singularized hence pollutant species are constantly in competition for active sites during the adsorption process. A key advantage of competitive adsorption studies is that it informs on the adsorbent performance in real water treatment applications. Objective: This study aims to investigate the competitive adsorption of Pb(II), Cu(II), Fe(II) and Zn(II) using elephant grass (Pennisetum purpureum) biochar and hybrid biochar from LDPE. Method: The produced biochar was characterised by Scanning Electron Microscopy (SEM) and Fourier Transform Infrared Spectroscopy (FTIR). The effect of adsorption parameters, equilibrium isotherm modelling and parametric studies were conducted based on data from the batch adsorption experiments. Results: For both adsorbents, the removal efficiency was >99% over the domain of the entire investigation for dosage and contact time suggesting that they are very efficient for removing multiple heavy metals from aqueous media. It was observed that removal efficiency was optimal at 2 g/l dosage and contact time of 20 minutes for both adsorbent types. The Elovich isotherm and the pseudo-second order kinetic models were best-fit for the competitive adsorption process. Conclusion: The study was able to successfully reveal that biomass biochar from elephant grass and hybrid biochar from LDPE can be used as effective adsorbent material for the removal of heavy metals from aqueous media. This study bears a positive implication for environmental protection and solid waste management.

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.

Sign in / Sign up

Export Citation Format

Share Document