Brewing Spent Diatomite as Adsorbents for Cu2+ Removal from Aqueous Solution

2014 ◽  
Vol 1010-1012 ◽  
pp. 523-527
Author(s):  
Ya Mei Wen ◽  
Hong Hui Teng
Keyword(s):  
Aqueous Solution ◽  
Adsorption Capacity ◽  
Adsorption Process ◽  
Copper Ions ◽  
Removal Rate ◽  
Order Reaction ◽  
Second Order Reaction ◽  
Initial Concentration ◽  
Adsorptive Removal ◽  
Initial Ph

Brewing spent diatomite (BSDT), a beer industrial by-product, was used for the adsorptive removal of copper ions from an aqueous solution. The results show that The removal rate of Cu2+decreased from 67.2% to 2.8% with decreasing initial pH from 6 to 2; the adsorption capacity decreased proportionally with an increasing amount of BSDT-800, but the removal efficiency of Cu2+increased with an increasing amount of adsorbent; the adsorption uptake at equilibrium (qe) increases from 9.9 mg/g to 34.1 mg/g with increasing initial concentration from 10 mg/L to 50 mg/L at 293K; the adsorption process of Cu2+onto BSDT-800 can be described by second-order reaction kinetics.

Fabrication of a novel graphene oxide/β-FeOOH composite and its adsorption behavior for copper ions from aqueous solution

2015 ◽  
Vol 44 (22) ◽  
pp. 10448-10456 ◽  
Author(s):  
Tingshun Jiang ◽  
Lu Yan ◽  
Lei Zhang ◽  
Yingying Li ◽  
Qian Zhao ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Graphene Oxide ◽  
Adsorption Capacity ◽  
Adsorption Process ◽  
Copper Ions ◽  
Removal Rate ◽  
Second Order ◽  
Adsorption Behavior ◽  
Kinetics Model ◽  
Pseudo Second Order

A graphene oxide/β-FeOOH composite was prepared and its adsorption capacity was evaluated by Cu2+removal. The adsorption process was well fitted with the pseudo-second-order kinetics model. The removal rate of Cu2+reached 93.8%.

Study on Adsorption of U(VI) From Aqueous Solution by Activated MgO

2017 ◽  
Author(s):  
Qingqing Liu ◽  
Xiaoyan Li
Keyword(s):  
Aqueous Solution ◽  
Adsorption Capacity ◽  
Adsorption Process ◽  
Removal Rate ◽  
Freundlich Isotherm ◽  
Batch System ◽  
15Mg Dose ◽  
Pseudo Second Order ◽  
Ft Ir ◽  
Kinetics Of

The activated MgO was synthesized by microwave homo-precipitator method and characterized by SEM, EDS and FT-IR methods. It was used to adsorption of U(VI) from aqueous solution with batch system. The paper discussed the effect of pH, temperature, contact time, adsorbent dose and initial U(VI) concentration on the adsorption. The results showed that activated MgO has good adsorption capacity for U(VI), the removal rate and equilibrium adsorption capacity reached 83.5% and 84.04mg·g−1 at pH 5.0, 15mg dose and 313K,respectively. The adsorption kinetics of U(VI) onto activated MgO were better fitted with pseudo-second-order kinetic.The adsorption isotherm data were fitted well to Freundlich isotherm model.The thermodynamic parameters showed that the adsorption process is endothermic and spontaneous.

Synthesis and Characterization of Zeolite X Obtained from Coal Gangue for Adsorption of Cu2+

2021 ◽  
Vol 13 (8) ◽  
pp. 1512-1520
Author(s):  
MiaoSen Zhang ◽  
SiYang Wang ◽  
Zheng Hu ◽  
RunZe Zhang ◽  
XiaoLi Wang
Keyword(s):  
Adsorption Capacity ◽  
Adsorption Kinetics ◽  
Ph Value ◽  
Copper Ions ◽  
Removal Rate ◽  
Coal Gangue ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Zeolite X ◽  
Initial Ph

China is a big coal producing country, there are a lot of coal gangue piled up. The zeolite X was synthesized by alkali melting and hydrothermal method based on the coal gangue from Chifeng city, Inner Mongolia. The obtained zeolite X sample is characterized by X-ray diffraction, SEM, EDS spectrum and IR which showed the X zeolite is an octahedral structure with complete crystal shape and uniform grain size. The results of BET showed the specific surface area of zeolite X is 354.8 m2/g and the minimum pore size is 3.8 nm which indicated that the zeolite X belongs to mesoporous materials. The adsorption conditions of the zeolite X adsorbent on copper ions were optimized. A solution containing Cu2+ ions with an initial concentration of 300 mg/L was added to the zeolite X with a dosage of 0.1 g and the initial pH value of the solution was adjusted to 6. Then the solution was oscillated for 120 min at 225 r/min. The maximum adsorption capacity and removal rate were 148.6 mg/g and 99.1%, respectively. The adsorption mechanism was discussed by adsorption kinetics and thermodynamics. The quasi-second order kinetic equation can be well used to describe the adsorption kinetics of zeolite X to Cu2+ (R2 = 0.9994) and Langmuir can well describe the adsorption behavior of zeolite X to Cu2+ (R2 = 0.9995) which showed the adsorption is a monolayer of chemical adsorption. The adsorption capacity of zeolite X to Cu2+ is about 4.0 times that of coal gangue, indicating that the zeolite X has good adsorption capacity.

Lignin-Quaternary Adsorbent: Synthesis, Characterization and Application for 2, 4, 6-Trinitrotoluene (TNT) Adsorption

2009 ◽  
Vol 620-622 ◽  
pp. 117-120 ◽  
Author(s):  
Xiu Rong Zhuo ◽  
Xue Gang Luo ◽  
Xiao Yan Lin ◽  
Chang Gang Xu
Keyword(s):  
Aqueous Solution ◽  
Mechanical Strength ◽  
Ir Spectra ◽  
Quaternary Ammonium ◽  
Langmuir Isotherm ◽  
Adsorption Process ◽  
Initial Concentration ◽  
Ether Bond ◽  
Initial Ph ◽  
Adsorbent Dose

A lignin-quaternary adsorbent was made from lignin after phenolization and then amination. As-prepared adsorbent was characterized by SEM, IR and DMA. Effects of adsorbent dose, initial pH and concentration on 2, 4, 6-Trinitrotoluene (TNT) removals from aqueous solution by adsorption of this adsorbent were comprehensively investigated. IR spectra showed that the product comprises quaternary ammonium groups in the form of ether bond. The mechanical strength of the adsorbent is enhanced by combining of PVA. It was possible to remove 66% of TNT from aqueous solution with 0.1 g of the adsorbent under certain conditions (100 mg/L and 25 °C). The results indicated that the amount of TNT adsorbed onto the adsorbent increased with increasing initial concentration; however, it decreased with an increase in pH. The adsorption process was determined to be consistent with the Langmuir isotherm.

Enhanced Photocatalytic Degradation of Antibiotic and Hydrogen Production by Iron Doped Cerium(IV) Oxide

2021 ◽  
Vol 21 (5) ◽  
pp. 3099-3106
Author(s):  
Yang Hsu ◽  
Joy Thomas ◽  
Chang Tang Chang ◽  
Chih Ming Ma
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Production ◽  
Photocatalytic Degradation ◽  
Removal Rate ◽  
Emerging Contaminant ◽  
Total Removal ◽  
Initial Concentration ◽  
The Poor ◽  
Initial Ph ◽  
Pl Emission

Norfloxacin (NF) is an emerging antibiotic contaminant due to its significant accumulation in the environment. Photocatalytic degradation is an effective method for removing emerging contaminant compounds in aqueous solution; however, it is not commonly applied because of the poor solubility of contaminant compounds in water. In this study, a photocatalytic degradation experiment was carried out on NF using a self-made ceria catalyst. At an initial concentration of NF of 2.5 mg L−1, the dosage of CeO2 was 0.1 g L−1 photocatalyst in water, and the initial pH of the NF solution was 8.0. With a reaction time of 180 min, the total removal rate of NF could reach 95%. Additionally, the studies on hydrogen production show that the maximum hydrogen production with 2% Fe–CeO2 can reach 25,670 μmol h−1 g−1 under close to 8 W of 365 nm, a methanol concentration of 20%, and a catalyst dose of 0.1 g L−1 photocatalyst in water. Furthermore, the intensities of photoluminescence (PL) emission peaks decreased with increased Fe-doped amounts on CeO2, suggesting that the irradiative recombination seemed to be weakened.

Adsorption of Cu2+ from Aqueous Solution by Walnut Shell

2013 ◽  
Vol 864-867 ◽  
pp. 1327-1332 ◽  
Author(s):  
Xiu Guo Lu ◽  
Pei Pei Yan ◽  
Xiao Fang Dang
Keyword(s):  
Aqueous Solution ◽  
Particle Size ◽  
Metal Ions ◽  
Adsorption Capacity ◽  
Removal Rate ◽  
Equilibrium Concentration ◽  
Walnut Shell ◽  
Adsorption Time ◽  
Adsorbent Dosage ◽  
Initial Ph

Walnut shell was used as adsorbent to remove Cu2+ metal ions from the simulated aqueous solution. The influence of factors, namely: particle size, initial pH, oscillation intensity, adsorbent dosage and adsorption time were investigated through single factor experiments.The results show that, the adsorption capacity reached the peak for Cu2+ in 25°C when the initial pH was 5, particle size was 1.25~1.6mm, adsorbent dosage was2.5g, oscillation speed reached 200r/min, and the adsorption time was 360min, all above leads the removal rate of Cu2+reached 75.7%, and the adsorption capacity of Cu2+ 0.702 mg/g. The pseudo-second-order model was fitted to describe the adsorption of Cu2+ , it was shown that adsorption rate for the metal ions in proportion to the square of the concentration.The equilibrium concentration of adsorption fitted well with Langmuir isotherm equation, the process of adsorption was single molecular layer adsorption.

scholarly journals Modified/Unmodified Nanoparticle Adsorbents of Cellulose Origin With High Adsorptive Potential for Removal of Pb(II) From Aqueous Solution

2017 ◽  
Vol 13 (27) ◽  
pp. 425
Author(s):  
Azeh Yakubu ◽  
Gabriel Ademola Olatunji ◽  
Folahan Amoo Adekola
Keyword(s):  
Aqueous Solution ◽  
Adsorption Capacity ◽  
Contact Time ◽  
Adsorption Process ◽  
Correlation Coefficients ◽  
Solution Temperature ◽  
Isotherm Models ◽  
Maximum Adsorption Capacity ◽  
Kinetics Of Adsorption ◽  
Kinetics Of

This investigation was conducted to evaluate the adsorption capacity of nanoparticles of cellulose origin. Nanoparticles were synthesized by acid hydrolysis of microcrystalline cellulose/cellulose acetate using 64% H3PO4 and characterized using FTIR, XRD, TGA-DTGA, BET and SEM analysis. Adsorption kinetics of Pb (II) ions in aqueous solution was investigated and the effect of initial concentration, pH, time, adsorbent dosage and solution temperature. The results showed that adsorption increased with increasing concentration with removal efficiencies of 60% and 92.99% for Azeh2 and Azeh10 respectively for initial lead concentration of 3 mg/g. The effects of contact time showed that adsorption maximum was attained within 24h of contact time. The maximum adsorption capacity and removal efficiency were achieved at pH6. Small dose of adsorbent had better performance. The kinetics of adsorption was best described by the pseudo-second-Order model while the adsorption mechanism was chemisorption and pore diffusion based on intra-particle diffusion model. The isotherm model was Freundlich. Though, all tested isotherm models relatively showed good correlation coefficients ranging from 0.969-1.000. The adsorption process was exothermic for Azeh-TDI, with a negative value of -12.812 X 103 KJ/mol. This indicates that the adsorption process for Pb by Azeh-TDI was spontaneous. Adsorption by Azeh2 was endothermic in nature.

scholarly journals The Sorption of Ni(II) by Grape Shell Ash from Aqueous Solution: Kinetic and Thermodynamic Studies

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Nahid Ghasemi ◽  
Maryam Ghasemi ◽  
Yaghoub Khosravi-Fard
Keyword(s):  
Rate Constants ◽  
Adsorption Process ◽  
Correlation Coefficients ◽  
Sorption Process ◽  
Maximum Increase ◽  
Equilibrium Sorption ◽  
Initial Concentration ◽  
Initial Ph ◽  
Solution Kinetic ◽  
Kinetic And Thermodynamic Studies

The sorption of Ni(II) onto grape shell ash (GSA) was studied by performing batch kinetic sorption experiments. The influences of major parameters in Nickel(II) ions sorption on GS such as initial of pH, initial concentration of Ni(II) ions, the initial temperatures of solution, and contact time were investigated. The maximum increase in the rate of sorption of Ni(II) ions on GS was observed at an initial pH = 5, initial concentration of nickel 50 mgL−1, temperature of solution (328 K), and t=90 min. The rate constants and the equilibrium sorption capacities were calculated. The results indicate that the sorption process follows the second-order kinetics and the values of rate constants were found to be 0.224, 0.402, 0.193 and 0.123 min−1 at 298, 308, 318, and 328 K, respectively. The values of correlation coefficients for the adsorption of Ni(II) on GSA from all the systems were found to be 0.999, and the values of predicted equilibrium sorption capacities showed good agreement with the experimental equilibrium uptake values. The thermodynamic parameters (ΔG°, ΔH°, and ΔS°) of the adsorption process were calculated, and these parameters showed that the adsorption process is spontaneous.

Experimental Study of Adsorption of Ammonia Nitrogen from Wastewater onto the Bagasse Adsorbent

2014 ◽  
Vol 529 ◽  
pp. 22-25 ◽  
Author(s):  
Li Wei Xie ◽  
Ze Long Xu ◽  
Yan Hua Huang ◽  
Shuang Cao ◽  
Zong Qiang Zhu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Experimental Study ◽  
Adsorption Capacity ◽  
Ammonia Nitrogen ◽  
Alkaline Condition ◽  
Maximum Adsorption Capacity ◽  
Initial Concentration ◽  
Adsorption Capacities ◽  
Neutrality Condition ◽  
Adsorbent Dose

Adsorption of ammonia nitrogen from aqueous solution onto the bagasse adsorbent has been investigated to evaluate the effects of Adsorbent dose, initial NH4+-N concentration, and pH on the removal systematically. With increasing initial concentration, the amount of ammonia nitrogen sorbed onto the adsorbent increased until it gradually decreased due to the initial concentration exceed 50 mg·L-1, and the maximum adsorption capacity was observed for the sample to be 1.31 mg·g-1 at the initial concentration of 30 mg·L-1, and the corresponding removal rates decreased from 94.01 to 3.89%, with increase in initial concentration from 5 to 100 mg·L-1. Adsorption capacities decreased from 6.04 to 0.49 mg·g-1 with increasing adsorbent dose from 0.1 to 1.5g. What’s more, under alkaline condition, the removal efficiency of ammonia nitrogen from aqueous solution onto the samples were superior to that under acidity and neutrality condition.

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