COMPREHENSIVE UTILIZATION OF PHOSPHOGYPSUM: ADSORPTION OF METHYLENE BLUE AND ITS APPLICATION IN BRICKS

2021 ◽  
pp. 2150075
Author(s):  
YA GAO ◽  
DI SUN ◽  
CHENGLIANG HAN ◽  
JUNJUN HUANG
Keyword(s):  
Methylene Blue ◽  
Adsorption Mechanism ◽  
Raw Material ◽  
Particle Diffusion ◽  
Kinetic Behavior ◽  
Maximum Capacity ◽  
Comprehensive Utilization ◽  
Monolayer Adsorption ◽  
Intra Particle Diffusion ◽  
The One

In this work, comprehensive utilization of phosphogypsum was developed. Methylene blue (MB) in aqueous solution was adsorbed by waste phosphogypsum (PG), and then the MB-adsorbed PG was used to the fabrication of PG bricks. The adsorption mechanism and the strength of PG bricks also have been studied. The dye maximum capacity of PG monolayer adsorption was found to be 0.2[Formula: see text]mg/g. The kinetic behavior is more accordant with the intra-particle diffusion equation. The MB-adsorbed PG could be effectively used as a raw material for building material. The mechanical properties of PG bricks were little different from the one of the water-washed PG bricks. The 2h-flexural and compressing strengths were about 2.8[Formula: see text]MPa and 6[Formula: see text]MPa, the dry-flexural and compressing strengths were about 5[Formula: see text]MPa and 20[Formula: see text]MPa.

From Wastes To Functions: Preparation of Layered Double Hydroxides From Industrial Waste And Its Removal Performance Towards Phosphates

2021 ◽  
Author(s):  
Liping Xiao ◽  
Yan Li ◽  
Qiaoping Kong ◽  
Yunlong Lan
Keyword(s):  
Langmuir Isotherm ◽  
Industrial Waste ◽  
Physical Adsorption ◽  
Raw Material ◽  
Isotherm Models ◽  
Particle Diffusion ◽  
Maximum Adsorption Capacity ◽  
Membrane Diffusion ◽  
Phosphorus Adsorption ◽  
Intra Particle Diffusion

Abstract To control eutrophication and recover phosphate from wastewater, a calcium carbide slag and red mud composite material (CR-LDH) was prepared using industrial waste as raw material for phosphorus adsorption. The morphology and structure of synthesized CR-LDH was characterized by FT-IR, SEM, EDS and XRD measurements. The experimental data can be well described by pseudo-second-order kinetics and Langmuir isotherm models, suggesting that the adsorption process of CR-LDH with respect to phosphate is a chemical and monolayer process. The theoretical maximum adsorption capacity obtained by Langmuir isotherm model is 16.06 mg·g-1 at 25 oC. The intra-particle diffusion model fitting results indicated that the adsorption of phosphate by CR-LDH was controlled by both liquid membrane diffusion and intra-particle diffusion. Phosphate was bound to CR-LDH via synergistic effect of physical adsorption, ion exchange, anion intercalation and chemical precipitation as evidenced from a combination of microscopic analysis and adsorption mechanism study. The actual phosphate-containing wastewater investigation showed that CR-LDH not only exhibited good removal effect on phosphate, but also could greatly reduce turbidity, COD and ammonia nitrogen, which was suitable for disposal of practical wastewater. These results indicate that CR-LDH can be considered as potential adsorbent for the treatment of phosphate-containing wastewater, which will be helpful to achieve the goal of "treating waste with waste and turning waste into treasure".

Removal of Cu2+ from Aqueous Water by Adsorption onto the Efficient and Recyclable Durian Shell-Derived Activated Carbon

2018 ◽  
Vol 876 ◽  
pp. 46-51 ◽  
Author(s):  
Long Giang Bach ◽  
Dai Viet Nguyen Vo ◽  
Nguyen Duy Trinh ◽  
Van Thi Thanh Ho ◽  
Van Thuan Tran
Keyword(s):  
Activated Carbon ◽  
Langmuir Model ◽  
Raw Material ◽  
P Value ◽  
Optimal Conditions ◽  
Considerable Decrease ◽  
Maximum Capacity ◽  
Monolayer Adsorption ◽  
Confirmation Test ◽  
Order Polynomial

We investigated the use of durian shell-derived activated carbon (DSAC) for the removal of Cu2+. To determine the optimal condition for Cu2+ removal, the response surface methodology (RSM) was used to establish a second-order polynomial model with variables such as Cu2+ concentration (Ci), adsorbent dosage (dDSAC) and pH. With R2 = 0.9847 and P-value < 0.0001, the model was proved to be statistically significant. The RSM based confirmation test revealed that the removal of Cu2+ was maximum (99.6%) at optimal conditions: Ci = 61.6 mg/L, dDSAC = 5.0 g/L and pH = 5.2. Based on calculated R2, data fitness for adsorption isotherms were positioned as follows: Langmuir > Tempkin > Freundlich. In other words, monolayer adsorption was the most favorable behavior with maximum capacity of 76.92 mg/g from Langmuir model. Interestingly, DSAC was reused at least five times without a considerable decrease of Cu2+ removal efficiency. Therefore, durian shell can be used as a highly effective, reusable and promising raw material to fabricate the activated carbon.

Hemicellulose-Based Porous Hydrogel for Methylene Blue Adsorption

2012 ◽  
Vol 560-561 ◽  
pp. 482-487 ◽  
Author(s):  
Zhan Xin Jing ◽  
Xiao Feng Sun ◽  
Qing Ye ◽  
Ya Jing Li
Keyword(s):  
Methylene Blue ◽  
Adsorption Capacity ◽  
Adsorption Mechanism ◽  
Maximum Adsorption Capacity ◽  
Methylene Blue Adsorption ◽  
Monolayer Adsorption ◽  
Effects Of Ph ◽  
Alkaline Conditions ◽  
Ft Ir ◽  
Porous Hydrogel

Hemicellulose-based porous hydrogel for methylene blue adsorption from aqueous solution was studied. The surface morphology of sample was analyzed by SEM, finding that it had the porous structure. Effects of pH and initial concentration on the adsorption capacity were investigated. Isotherm studies found that the adsorption of metylene blue onto absorbent was a monolayer adsorption, and the maximum adsorption capacity was 444.44 mg/g. The adsorption mechanism was analyzed by FT-IR, and it showed that the produced -COO- groups in alkaline conditions were advantaged for adsorption process, which offers the impetus for combination of adsorbent and methylene blue. Hemicellulose-based porous hydrogel is an inexpensive and biodegradable material, and can be a promising absorbent for cationic removing from wastewater.

scholarly journals Methylene Blue Sorption Equilibria on Hydroxylated Silica Surfaces as Well as on Carbon–Silica Adsorbents (Carbosils)

2000 ◽  
Vol 18 (2) ◽  
pp. 83-95 ◽  
Author(s):  
V.V. Yanishpolskii ◽  
J. Skubiszewska-Zieba ◽  
R. Leboda ◽  
V.A. Tertykh ◽  
I.V. Klischar
Keyword(s):  
Methylene Blue ◽  
Adsorption Mechanism ◽  
Silica Surface ◽  
Adsorption Properties ◽  
The Other ◽  
Silica Surfaces ◽  
Silica Adsorbents ◽  
Wide Range ◽  
The One ◽  
Sorption Equilibria

The adsorption properties of hydroxylated silica gel as well as carbon–silica adsorbents (Carbosils) containing 5 and 18 w/w% carbon, both treated hydrothermally (with hydrogen peroxide solution) (HTT samples) and untreated, towards Methylene Blue (MB) were compared. The equilibrium adsorption of MB solutions of 6.5–7.0 × 10−4 mol/l concentration and its dependence on pH were studied. At this concentration, ca. 30% of the adsorbent surfaces investigated were covered with MB molecules under optimal adsorption conditions. The presence of carbon deposits on the silica surface did not lead to a decrease in the adsorption capacity of Carbosils relative to that of hydroxylated silica. However, such deposits increased the resistance of the adsorbent towards the action of alkalis. Oxidation of the carbon deposit in the HTT process caused a further increase in this resistance. Hence, the adsorption mechanism of MB at equilibrium in individual systems of the type investigated can differ significantly. On the one hand, this mechanism is associated with the differing behaviour of silica over a wide range of pH relative to treated and untreated Carbosils and on the other hand with the specific properties of MB.

scholarly journals Removal of Methylene Blue Dye Pollutant from Aqueous Solution Using Sugar Cane Bark and Chaff Biomass

2016 ◽  
Vol 69 ◽  
pp. 49-57
Author(s):  
Veronica Onyeocha ◽  
Kelechukwu N. Onwukamike ◽  
Victor O. Njoku ◽  
Maduabuchi Arinzechukwu Chidiebere ◽  
Emeka E. Oguzie
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Sugar Cane ◽  
Contact Time ◽  
Adsorption Mechanism ◽  
Polluted Water ◽  
Blue Dye ◽  
Operating Variables ◽  
Monolayer Adsorption ◽  
Equilibrium Data

The removal of Methylene blue (MB) dye pollutant from aqueous solution using sugar cane bark (SCB) and chaff (SCC) was studied using batch experiments. The operating variables studied were initial biomass dose, initial dye concentration, contact time, pH and temperature. The result revealed that the amount of MB dye uptake, qe(mg/g) increased with an increase in temperature, dye concentration and contact time, but decreased with an increase in adsorbent dosage. Equilibrium data were found to obey Langmuir isotherm for both biomass, showing a monolayer adsorption mechanism. The monolayer sorption capacity of SCB and SCC for MB dye were found to be 1.282mg/g and 1.706mg/g, respectively at 303K. The thermodynamics parameters of the MB / biomass system indicate spontaneous (ΔG◦<0) and endothermic (ΔH >0) process. The study show that SCB and SCC which are common environmental wastes can be used for the treatment of MB dye polluted water.

scholarly journals Synthesis and Evaluation of the Ability of Poly(Methacrylic Acid-co-acrylamide)/nanoclay Composite Hydrogel in the Adsorption of Methylene Blue Dye

2021 ◽  
Author(s):  
Hamid Safarzadeh ◽  
Seyed Jamaleddin Peighambardoust ◽  
Seyed Hamed Mousavi ◽  
Reza Mohammadi ◽  
Rauf Foroutan ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Adsorption Capacity ◽  
Methacrylic Acid ◽  
Adsorption Process ◽  
Particle Diffusion ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Nanocomposite Hydrogel ◽  
Cloisite 30B ◽  
Intra Particle Diffusion

Abstract The performance of poly(methacrylic acid-co-acrylamide/nanoclay composite (poly(MAA-co-AAm)/NCC) hydrogel to adsorb methylene blue (MB) dye from aqueous solutions was investigated and the adsorption efficiency was improved by incorporating Cloisite 30B nanoclays in the adsorbent structure. The hydrogels were analyzed using FTIR, XRD, TGA, and SEM analysis. The effect of adsorbent dose, temperature, initial dye concentration, contact time, and pH on the efficiency of the adsorption process was investigated. Adsorption efficiencies of 98.57 and 97.65% were obtained for poly(MAA-co-AAm)/NCC and poly(MAA-co-AAm) hydrogels, respectively. Kinetic study revealed that the adsorption process followed pseudo-first-order kinetic model and α-parameter values of 6.558 and 1.113 mg/g.min were obtained for poly(MAA-co-AAm)/NCC and poly(MAA-co-AAm) hydrogels, respectively indicating a higher ability of nanocomposite hydrogel in adsorbing MB-dye. In addition, the results of the intra-particle diffusion model showed that various mechanisms such as intra-particle diffusion and liquid film penetration are important in the adsorption. The Gibbs free energy parameter of adsorption process showed negative values of -256.52 and -84.071 J/mol.K for poly(MAA-co-AAm)/NCC and poly(MAA-co-AAm) hydrogels indicating spontaneous nature of the adsorption. The results of enthalpy and entropy showed that the adsorption process was exothermic and random collisions were reduced during the adsorption. The equilibrium data for the adsorption process using poly(MAA-co-AAm)/NCC and poly(MAA-co-AAm) hydrogels followed Freundlich and Langmuir isotherm models, respectively. The maximum adsorption capacity values of 32.83 and 21.92 mg/g were obtained for poly(MAA-co-AAm)/NCC and poly(MAA-co-AAm) hydrogels, respectively. Higher adsorption capacity of nanocomposite hydrogel was attributed to the presence of Cloisite 30B clay nanoparticles in its structure. In addition, results of RL, n, and E parameters showed that the adsorption process was performed optimally and physically.

Adsorption of p-Cresol by Mesoporous Activated Carbon. II. Mechanism studies and data modeling

2017 ◽  
Vol 68 (3) ◽  
pp. 496-499
Author(s):  
Mihaela Neagu ◽  
Daniela Roxana Popovici ◽  
Loredana Elena Vijan ◽  
Catalina Calin
Keyword(s):  
Activated Carbon ◽  
Adsorption Mechanism ◽  
Adsorption Process ◽  
Point Of Zero Charge ◽  
Particle Diffusion ◽  
Ftir Analysis ◽  
Film Diffusion ◽  
Mesoporous Activated Carbon ◽  
Boehm Titration ◽  
Intra Particle Diffusion

In this work, the adsorption mechanism of p-cresol from aqueous solution onto mesoporous activated carbon was investigated. The mechanism of the adsorption process was determined from Weber-Morris and Boyd models. By graphical and statistical analysis was demonstrated that both film-diffusion and intra-particle diffusion are concurrent in adsorption mechanism. The adsorption mechanism of p-cresol onto mesoporous activated carbon was sustained by FTIR analysis, Boehm titration and the point of zero charge of the GAC.

Preparative separation and purification of flavonoids from Lamiophlomis rotata (Benth.) Kudo.

2017 ◽  
Vol 46 (6) ◽  
pp. 496-506 ◽  
Author(s):  
Yingyu Zhao ◽  
Zhenbin Chen ◽  
Jie Li ◽  
Zhen Liu ◽  
Donglei Liu ◽  
...  
Keyword(s):  
Diffusion Model ◽  
Adsorption Mechanism ◽  
Particle Diffusion ◽  
Optimal Conditions ◽  
Separation And Purification ◽  
Adsorption Dynamic ◽  
Plant Resources ◽  
Content Type ◽  
Intra Particle Diffusion ◽  
Macroporous Adsorption Resin

Purpose The purpose of the paper is to separate and purify flavonoids existed in Lamiophlomis rotata (Benth.) Kudo. by macroporous adsorption resin (MAR) mixed-bed technology. Design/methodology/approach The adsorption and desorption parameters were characterized by UV-VIS spectrophotometry. The optimal MAR mixed bed was screened based on the adsorption experiments; the experiment process was investigated by the order of single, two and three MAR mixed bed separately; and the adsorption performance, which was composed by the authority of 80 per cent adsorption ratios and 20 per cent desorption ratios, was adopted to screen MAR mixed bed for flavonoids. The adsorption dynamic investigated the order of reaction first, and then the adsorption mechanism was researched further. The adsorption thermodynamic investigated the adsorption isotherm first, and then the adsorption feature was analyzed. Findings This research found that MAR mixed bed of LS-840 + LSD301 with mass ratio of mLS840:mLSD301 = 3:2 was the optimized combination, and the optimal conditions of the adsorption were volume V = 50 mL, time t = 6.5 h, T = 40°C. The desorption conditions were ethanol content = 70 per cent, desorption time t = 3.0 h, T = 40°C. The adsorption dynamic experimental data fitted better to the pseudo-second-order, and the intra-particle-diffusion model was more suitable for expression of the adsorption mechanism in mesopores process, whereas the homogeneous particle-diffusion model was more suitable in microspores. The adsorption was a physical and multilayer adsorption, and the adsorption driving force was disappeared as it transferred to the fourth layer. Practical implications Find an efficient way to separate flavonoids that useful for human’s health, which can not only utilize of plant resources effectively, but also make outstanding contributions to medical industry. It has very high economic and social value. Originality/value This contribution provided a new way to separate flavonoids from Lamiophlomis rotata (Benth.) Kudo. Under the optimal conditions, the adsorption rate (F) of MAR mixed bed LS-840 + LSD301 to the flavonoids was 97.81 per cent, the desorption rate (D) was 90.02 per cent and the purity of flavonoids was dramatically increased about 2.08 fold of the crude extract from 28 to 58.4 per cent, and the recovery yield of flavonoids arrived at 91.6 per cent after a circle of adsorption/desorption operation.

scholarly journals Novel Adsorbent for Industrial Wastewater Treatment Applications

2019 ◽  
Vol 9 (1) ◽  
pp. 1219-1225
Keyword(s):  
Methylene Blue ◽  
Second Order ◽  
Thymol Blue ◽  
Batch Adsorption ◽  
Particle Diffusion ◽  
Maximum Adsorption Capacity ◽  
Basic Solution ◽  
Order Kinetic ◽  
Intra Particle Diffusion ◽  
Pseudo Second Order

In this study, the hydroxyapatite powder is investigated for both of methylene blue and thymol blue in aqueous solution. The physical and chemical properties of the adsorbent were evaluated systematically using the different techniques including Microsoft Excel programming, linear regression model and also the coefficient of determination. Batch adsorption experiments were conducted to determine the effect of contact time, solution pH, initial dye concentrations, and also the adsorbent dosage on adsorption. The adsorption kinetic parameters confirmed the better fitting of pseudo-second order kinetic model for both of methylene blue and thymol blue. The isotherm data of methylene blue and thymol blue could be well described by the Freundlich isotherm model which means the adsorption is multilayer adsorption with non-uniform distribution of adsorption heat and affinities over the heterogeneous surface. The maximum adsorption capacity (KF) of methylene blue and thymol blue is found to be 0.2736 (L/mg) and 11.18407 (L/mg) respectively. The high specific surface area and the porous structure with some acidic functional groups on the surface were obviously responsible for high dyes adsorption onto hydroxyapatite (HA). Adsorption kinetics data were modeled with the application of Pseudo first order, Pseudo second order and Intraparticle diffusion models. The results revealed that the Pseudo second order model was the best fitting model. Which means that, the adsorption mechanism followed two stages in which the first one was fast and the other was slower step. Which means the adsorption of dye molecules was limited by intra particle diffusion and film diffusion, as well as, the adsorption rate in both of adsorption system are depends only on the slower step.The Boyd plot exposed that the intra-particle diffusion was the rate controlling step of the adsorption process of both of methylene blue and thymol blue molecules by HA powder. However, the adsorption of methylene blue molecules (basic solution) using of HA as adsorbent particles is found to be extremely preferable than thymol blue molecules.

Elaboration of novel adsorbent from Moroccan oil shale using Plackett–Burman design

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Methylene Blue ◽  
Oil Shale ◽  
Screening Method ◽  
Raw Material ◽  
Coefficient Of Determination ◽  
Processing Temperature ◽  
Acid Pretreatment ◽  
Experimental Data Processing ◽  
Experimental Values ◽  
Maximal Capacity

The new adsorbents were prepared from Moroccan oil shale by chemical and physical process .In this study, experimental Plackett-Burman has been used as a screening method to study six factors for the development of materials to adsorbent basis of oil shale Moroccan. The factors have been identified by two levels, To Know temperature (°C), Processing time (min), mass ratio (m precursor/m acid), Pretreatment mixture the precursor with acid, origin of the raw material and type of the activating agent (H2SO4, H3PO4).And it was chosen as a response The maximum quantity of adsorption of the molecule of Methylene blue (Qads in mg/g) and the specific surface measure by the method bet (Sbet in m2/g), The predicted values were in agreement with the experimental values with a coefficient of determination (R2) of 0.98. The model has been validated by experiments subsequent to optimized conditions. The experimental data processing by software JMP 7 showed that the processing temperature The report of oil shale on the acid and activation time were the important effect on the maximal capacity of adsorption of methylene blue. The sample prepared at 237 °C during 215 min with pre-processing has a maximal capacity of adsorption equal to 54mg/g according to model of adsorption of Langmuir and SBET equal to 143 m2/g.

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