Preparation of Fly Ash/CeO2 Composite and its Adsorption Kinetics for Congo Red Dye from Aqueous Solution

2015 ◽  
Vol 814 ◽  
pp. 458-463
Author(s):  
Bei Gang Li ◽  
Lei Ding
Keyword(s):  
Fly Ash ◽  
Congo Red ◽  
Removal Rate ◽  
Physical Adsorption ◽  
Low Cost ◽  
Raw Material ◽  
Precipitation Method ◽  
Adsorption Model ◽  
Acid Modification ◽  
High Efficient

Fly ash/CeO2 composite (FA/CeO2) was prepared by acid modification and precipitation method using a low-cost waste fly ash (FA) as a raw material and characterized by X-ray diffraction (XRD) and the BET surface analysis. The adsorption of FA and FA/CeO2 for Congo Red (CR) from simulated dye wastewater was studied. The different regeneration methods for the CR-saturated FA/CeO2 were investigated. The results show that the adsorption capacity and removal rate of CR on FA/CeO2 can respectively reach 175.35mg/g and 97.42%, 4.5 times higher than those on FA. The adsorption process of FA/CeO2 for CR at different temperatures (25°C~55°C) can well be described by the pseudo-second-order adsorption model and is mainly controlled by intraparticle diffusion. The adsorption rate decreased slightly with increasing temperature, and the obtained adsorption apparent activation energy is 15.08kJ/mol. This indicates that CR is easily adsorbed on FA/CeO2, and the adsorption of the process is mainly physical adsorption with exothermic nature. The room temperature is favorable to the adsorption and actual operation. NaOH solution of 0.01 mol/L can make CR-saturated FA/CeO2 regenerated three times, and corresponding removal rate for CR can reach 97.82%, 80.21% and 66.04%, respectively. As a new kind of low-cost and high-efficient adsorbent, FA/CeO2 composite has the potential value in the application of wastewater treatment.

The Effective Removal of Congo Red Dye from Aqueous Solution Using Fly Ash/CeO2 Composite Material

2014 ◽  
Vol 535 ◽  
pp. 671-674 ◽  
Author(s):  
Lei Ding ◽  
Bei Gang Li ◽  
Jing Mi
Keyword(s):  
Aqueous Solution ◽  
Fly Ash ◽  
Congo Red ◽  
Ph Value ◽  
Removal Rate ◽  
Langmuir Model ◽  
Raw Material ◽  
Precipitation Method ◽  
Isotherm Models ◽  
Maximum Adsorption Capacity

Fly ash/CeO2 composite adsorbent (FA/CeO2) was prepared by HCl treatment and precipitation method using a low-cost waste fly ash (FA) as the raw material and used for the removal of Congo Red (CR) from aqueous solution. Effects of important parameters such as contact time, initial dye concentration, pH value and temperature were explored. Adsorption equilibrium and isotherms were investigated. The adsorption of CR onto FA/CeO2 is a fast process and to achieve a basic balance in 30 minutes. The removal of CR is strongly pH-dependent. FA/CeO2 is an effective adsorbent for the CR removal with removal rate of 98.8% when initial CR concentration is 1000 mg/L. The experimental isotherm data were analyzed using Langmuir and Freundlich isotherm models. The results revealed that the adsorption behavior of CR on FA/CeO2 fitted well with the Langmuir model at different temperatures. The maximum adsorption capacity obtained by Langmuir model is 232.56 mg/g which is nearly consistent with the actual adsorption value of 230.01 mg/g at 298K. The Adsorption amount decreases with increasing temperature, but the variation of the amplitude is very small.

scholarly journals Hydrothermal Synthesis of Sodalite-Type N-A-S-H from Fly Ash to Remove Ammonium and Phosphorus from Water

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2741
Author(s):  
Pengcheng Lv ◽  
Ruihong Meng ◽  
Zhongyang Mao ◽  
Min Deng
Keyword(s):  
Fly Ash ◽  
Adsorption Capacity ◽  
Removal Rate ◽  
Kinetic Studies ◽  
Solute Concentration ◽  
Raw Material ◽  
Sodium Aluminosilicate ◽  
Equilibrium Data ◽  
One Step ◽  
Ft Ir

In this study, the hydrated sodium aluminosilicate material was synthesized by one-step hydrothermal alkaline desilication using fly ash (FA) as raw material. The synthesized materials were characterized by XRD, XRF, FT-IR and SEM. The characterization results showed that the alkali-soluble desilication successfully had synthesized the sodium aluminosilicate crystalline (N-A-S-H) phase of sodalite-type (SOD), and the modified material had good ionic affinity and adsorption capacity. In order to figure out the suitability of SOD as an adsorbent for the removal of ammonium and phosphorus from wastewater, the effects of material dosing, contact time, ambient pH and initial solute concentration on the simultaneous removal of ammonium and phosphorus are investigated by intermittent adsorption tests. Under the optimal adsorption conditions, the removal rate of ammonium was 73.3%, the removal rate of phosphate was 85.8% and the unit adsorption capacity reached 9.15 mg/L and 2.14 mg/L, respectively. Adsorption kinetic studies showed that the adsorption of ammonium and phosphorus by SOD was consistent with a quasi-secondary kinetic model. The adsorption isotherm analysis showed that the equilibrium data were in good agreement with the Langmuir and Freundlich model. According to thermodynamic calculations, the adsorption of ammonium and phosphorus was found to be a heat-absorbing and spontaneous process. Therefore, the preparation of SOD by modified FA has good adsorption properties as adsorbent and has excellent potential for application in the removal of contaminants from wastewater.

Adsorption of Congo Red Dye on HDTMA Surfactant-Modified Zeolite A Synthesized from Fly Ash

2018 ◽  
Vol 382 ◽  
pp. 307-311 ◽  
Author(s):  
Jumaeri ◽  
Sri Juari Santosa ◽  
Sutarno
Keyword(s):  
Fly Ash ◽  
Congo Red ◽  
Contact Time ◽  
Batch Reactor ◽  
Order Kinetic ◽  
Zeolite A ◽  
Adsorption Model ◽  
Anionic Dyes ◽  
Initial Concentration ◽  
Modified Zeolite

Adsorption of anionic dyes Congo Red (CR) on HDTMA surfactant-modified zeolite A has been studied. The zeolite A, which is synthesized from coal fly ash, was modified with surfactant hexdeciltrimethylammonium bromide (HDTMA-Br) as much as 200% cation exchange capacity (CEC) of the zeolite. The effect of pH, contact time and initial concentration on the CR adsorption has been evaluated.The adsorption was carried out in a batch reactor at various pH, contact time and initial concentration on the given temperature. The amount CR adsorption varies as a function of pH, contact time and initial concentration of solution. Adsorption model of Langmuir and Freundlich from empirical data is used for this experiment. The Langmuir isotherm is more suitable for this adsorption. The experimental data fulfilled pseudo second-order kinetic models. The surfactant-modified zeolite A is more effective than zeolite A without modified on the adsorption of CR in aqueous solution.

Adsorption of Alizarin Red from Aqueous Solution Using Ultra-Fine Fly Ash

2012 ◽  
Vol 518-523 ◽  
pp. 2307-2314 ◽  
Author(s):  
Bei Gang Li ◽  
Li Yuan Zhao
Keyword(s):  
Aqueous Solution ◽  
Fly Ash ◽  
Rate Equation ◽  
Removal Rate ◽  
Physical Adsorption ◽  
Particle Diffusion ◽  
Alizarin Red ◽  
Order Rate ◽  
Intra Particle Diffusion ◽  
Order Rate Equation

Alizarin Red (AR) has been shown to be effectively removed from aqueous solution using the ultrafine fly ash (UFA) prepared by ball milling from raw fly ash (FA), a low-cost industrial solid waste. The maximum removal rate was 91.04% in a solution of initial AR concentration of 700 mg/L, adsorption time of 60 min at pH 5.0 and temperature of 25°C. Compared with FA, the adsorption capacity of UFA is higher for AR removal. Effects of important parameters, contact time, adsorbate concentration, pH and temperature, were investigated. The UFA and AR-loaded UFA were characterized by FT-IR. The equilibrium, kinetics and thermodynamics of AR adsorption onto UFA were evaluated. The AR uptake process followed the pseudo-second-order rate equation well, but the pseudo-first-order rate equation and intra-particle diffusion equation could only be applied to describe the initial stage of adsorption, furthermore, intra-particle diffusion might be the rate-controlling step of fast adsorption process. The sorption decreased with increasing temperature and the adsorption apparent activation energy was 8.28kJ/mol. Langmuir isotherm equation could better describe the adsorption equilibrium at different temperatures, compared with Freundlich model. Thermodynamic parameters, ΔG, ΔH and ΔS, were also calculated. The results inferred that the adsorption of AR/UFA system was feasible, spontaneous and exothermic nature of the process which was mainly controlled by physical adsorption.

scholarly journals Studies on the CO2 Capture by Coal Fly Ash Zeolites: Process Design and Simulation

Energies ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 8279
Author(s):  
Silviya Boycheva ◽  
Ivan Marinov ◽  
Denitza Zgureva-Filipova
Keyword(s):  
Fly Ash ◽  
Co2 Capture ◽  
Carbon Capture ◽  
Low Cost ◽  
Coal Fly Ash ◽  
Cost Effective ◽  
Thermal Recovery ◽  
Raw Material ◽  
Dynamic Adsorption ◽  
Co2 Capture Capacity

At present, mitigating carbon emissions from energy production and industrial processes is more relevant than ever to limit climate change. The widespread implementation of carbon capture technologies requires the development of cost-effective and selective adsorbents with high CO2 capture capacity and low thermal recovery. Coal fly ash has been extensively studied as a raw material for the synthesis of low-cost zeolite-like adsorbents for CO2 capture. Laboratory tests for CO2 adsorption onto coal fly ash zeolites (CFAZ) reveal promising results, but detailed computational studies are required to clarify the applicability of these materials as CO2 adsorbents on a pilot and industrial scale. The present study provides results for the validation of a simulation model for the design of adsorption columns for CO2 capture on CFAZ based on the experimental equilibrium and dynamic adsorption on a laboratory scale. The simulations were performed using ProSim DAC dynamic adsorption software to study mass transfer and energy balance in the thermal swing adsorption mode and in the most widely operated adsorption unit configuration.

Preparation of Fly Ash/Nano-ZnO Composite and its Adsorption Properties for Reactive Dyes from Aqueous Solution

2013 ◽  
Vol 726-731 ◽  
pp. 2936-2939
Author(s):  
Bei Gang Li ◽  
Qian Long Hu ◽  
Zhi Yan Fu ◽  
Chen Wang
Keyword(s):  
Aqueous Solution ◽  
Fly Ash ◽  
Raw Materials ◽  
Dye Adsorption ◽  
Reactive Dyes ◽  
Chemical Precipitation ◽  
Precipitation Method ◽  
Nano Zno ◽  
Preparation Conditions ◽  
High Efficient

The fly ash (FA)/nano-ZnO composite was prepared by chemical precipitation method using waste FA, ZnSO4 and (NH4)2CO3 as raw materials and further analyzed by specific surface area and XRD. effects of important preparation conditions on the dye adsorption capacity of the composite were investigated. The results show that the FA/nano-ZnO composite obtained under optimal conditions of FA/ZnO mass ratio of 1:0.5, reaction and standing 2h at 60°C and calcining time of 3h at 250°C is a high efficient adsorbent and has much more higher adsorption capacities on 4 kinds of reactive dyes, reactive turquoise blue KN-G, reactive brilliant blue KN-R, reactive brilliant red X-3B and reactive brilliant red KD-8B from aqueous solution with 61.64mg/g, 46.36mg/g, 43.27mg/g and 31.18mg/g which are increased about 14, 32, 33 and 32 times than that of FA, respectively.

scholarly journals Preparation, Characterization and Applications of Chitosan-Nanosilica-Graphene Oxide Nanocomposite

2021 ◽  
Vol 33 (11) ◽  
pp. 2789-2795
Author(s):  
A. Sahila Grace ◽  
G.S. Prabha Littis Malar
Keyword(s):  
Electron Microscopy ◽  
Fourier Transform ◽  
Graphene Oxide ◽  
Low Cost ◽  
Raw Material ◽  
Precipitation Method ◽  
Coconut Husk ◽  
Transmission Electron ◽  
Shrimp Shell ◽  
Ft Raman Spectroscopy

In present study, a simple low cost method was used to prepare chitosan-nanosilica-graphene oxide (CS-NSi-GO) nanocomposite. Nanosilica and graphene oxide were synthesized from coconut husk ash and chitosan was synthesized from shrimp shell. Nanosilica was synthesized from coconut husk ash with alkaline extraction using sodium hydroxide followed by precipitation method using sulphuric acid. Graphene oxide was synthesized from the oxidative treatment of the raw material of coconut husk ash. After the synthesis of silica, the carbonized graphite was collected and treated by modified Hummer’s method. The CS-NSi-GO nanocomposite was prepared by condense polymerization method. Various analytical methods such as Fourier transform infrared (FTIR) spectroscopy, Fourier transform Raman (FT-Raman) spectroscopy, scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDAX) and transmission electron microscopy (TEM) were used to characterize the CS-NSi-GO nanocomposite. Eventually antibacterial, antifungal, antioxidant and cytotoxicity of the prepared nanocomposite were also evaluated.

scholarly journals Study on the preparation of granular alum sludge adsorbent for phosphorus removal

2019 ◽  
Vol 79 (12) ◽  
pp. 2378-2386 ◽  
Author(s):  
H. F. Wu ◽  
J. P. Wang ◽  
E. G. Duan ◽  
Y. F. Feng ◽  
Z. Y. Wan ◽  
...  
Keyword(s):  
Removal Rate ◽  
Low Cost ◽  
Average Pore Size ◽  
Treatment Plant ◽  
Drinking Water Treatment ◽  
Water Treatment Plant ◽  
Raw Material ◽  
Phosphorus Concentration ◽  
Average Pore ◽  
Alum Sludge

Abstract Alum sludge is the sludge discharged from a sedimentation tank in a drinking water treatment plant when polymerized with poly-aluminum chloride (PAC). In this paper, granular alum sludge adsorbent (GASA) was manufactured using powdery alum sludge (PAS) as the raw material and methods such as gluing and pore-forming. The effects of different binders, pore-forming agents, roasting temperatures, and roasting times on the formation of GASA and its dephosphorization performance were investigated. Results showed that the optimum binder was AlCl3 at a mass ratio of 8%, and the best pore-forming agent was starch at a 4% dosage ratio. Meanwhile, the optimum roasting temperature and time were 500 °C and 2 hours, respectively. The specific surface area of GASA was 23.124 m2/g. Scanning electron microscopy suggested that GASA's surface became rough, particles became tight, and average pore size increased, with additional pore channels. P adsorption by GASA reached 0.90 mg/g. The effluent phosphorus concentration of actual tail water decreased to 0.49 mg/L and the removal rate reached 73.5% when the GASA dosage was 20 g/L. The findings of this study are important for the further development of a low-cost adsorbent material for P removal in the future.

scholarly journals Efficient Production of Methyl Oleate Using a Biomass-Based Solid Polymeric Catalyst with High Acid Density

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Anping Wang ◽  
Heng Zhang ◽  
Hu Li ◽  
Song Yang
Keyword(s):  
Catalytic Activity ◽  
Oleic Acid ◽  
Methyl Oleate ◽  
Low Cost ◽  
Catalytic Performance ◽  
Raw Material ◽  
Efficient Production ◽  
High Acid ◽  
High Efficient ◽  
Good Catalytic Activity

Biomass-based polymers are eco-friendly, nontoxic and biodegradable materials. In this work, in order to prepare green, low-cost and high-efficient catalysts under mild conditions, we chose biomass-based chitosan as raw material and prepared a new solid acidic catalyst by an acid functionalization method. FT-IR, XRD, SEM, TGA, BET, neutralization titration and other analytical methods were used to characterize the catalyst. The results showed that CS-SO3H morphology exhibited a sphere of about 10 μm diameter, and the acid density was as high as 3.81 mmol/g. The catalyst exhibits good catalytic activity in the esterification of oleic acid and methanol, which is a model reaction of the pre-esterification process in the preparation of biodiesel from feedstocks with high acid values. Under the optimum reaction conditions (15/1 methanol/oleic acid mole ratio and 3 wt% catalyst dosage at 75°C for 3 h), the yield of methyl oleate can reach 95.7%. Even if the mass of oleic acid in the reactant increased to 20 g, solid acid showed good catalytic performance, and the yield of methyl oleate was 94.4%. After four times of reuse, the yield of the catalyst can still reach 85.7%, which indicates that the catalyst has good catalytic activity and stability, and has potential application prospects.

scholarly journals Preparation, Microstructure, and Mechanical Properties of Spinel-Corundum-Sialon Composite Materials from Waste Fly Ash and Aluminum Dross

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Juntong Huang ◽  
Minghao Fang ◽  
Zhaohui Huang ◽  
Yan’gai Liu ◽  
Jingzhou Yang ◽  
...  
Keyword(s):  
Fly Ash ◽  
Bulk Density ◽  
Bending Strength ◽  
Low Cost ◽  
Apparent Porosity ◽  
Raw Material ◽  
Added Value ◽  
Ni Doping ◽  
Aluminum Dross ◽  
Al Content

The solid wastes fly ash and aluminum dross were used to prepare the low cost, high added-value product spinel-corundum-Sialon with anin situaluminothermic reduction-nitridation reaction. The effects of varying raw material components and heating temperatures on the phase compositions, microstructure, bulk density, apparent porosity, and bending strength of products were investigated. The presence of hazardous or impure elements in the products was also evaluated. The sintered materials mainly consisted of micro-/nanosized plate corundum, octahedral spinel, and hexagonal columnarβ-Sialon. The bulk density and bending strength of product samples initially increased and then decreased as Al content increased. Product samples with an Al content exceeding 10 mass% that were sintered at 1450°C exhibited the highest bending strength (288 MPa), the lowest apparent porosity (1.24%), and extremely low linear shrinkage (0.67%). The main impurity present was Fe5Si3with hazardous elements P, Cr, Mn, and Ni doping. This work could provide a new method to reduce environmental pollution and manufacture low cost high performance refractory materials using the abundant waste materials fly ash and aluminum dross.

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