scholarly journals Preparation of modified pomelo peel's pulp adsorbent and its adsorption to uranyl ions

2019 ◽  
Vol 6 (3) ◽  
pp. 181986 ◽  
Author(s):  
Pengfei Yang ◽  
Yuanhe Xu ◽  
Jie Tuo ◽  
Ang Li ◽  
LixiAng Liu ◽  
...  
Keyword(s):  
Adsorption Process ◽  
Ph Value ◽  
Raw Material ◽  
Uranyl Ions ◽  
Adsorption Time ◽  
Initial Concentration ◽  
Adsorption Condition ◽  
Adsorption Temperature ◽  
Freundlich Adsorption Isotherm ◽  
Pseudo Second Order

Using pomelo peel's pulp (PPP) as raw material, a new chemically modified PPP was prepared by the process of fermentation, cooking, freeze-drying, and so on. The adsorbent has been characterized by EDS, IR, BET and SEM. The factors of different adsorption conditions such as pH value, adsorption temperature, mass of adsorbent, adsorption time and initial concentration of UO 2 2+ were investigated. The adsorption mechanism was explored by adsorption thermodynamics and kinetics experiments. The results indicate that the pH value is 6.0, the dosage of adsorbent is 500 mg l –1 , the temperature is 50°C and the adsorption time is 90 min, which is the best adsorption condition. When the initial concentration of UO 2 2+ is 35 mg l –1 , the adsorbed amount of uranyl ions by the modified PPP adsorbent can reach 42.733 mg g −1 , 26.8% higher than the adsorption amount of unmodified adsorbent (31.276 mg g −1 ), which is obviously enhanced. The kinetic and thermodynamic experiments show that the adsorption process is in good agreement with the pseudo second-order kinetics model, that it is an endothermic reaction, and the reaction is spontaneous. The adsorption process is entropy-dominated. The Freundlich adsorption isotherm can describe the adsorption process more accurately.

The Decoloration Property of Modified Reed Absorbent for Alkaline Fuchsin Wastewater

2013 ◽  
Vol 821-822 ◽  
pp. 365-368
Author(s):  
Yu Ying
Keyword(s):  
Adsorption Isotherm ◽  
Ph Value ◽  
Adsorption Time ◽  
Adsorption Condition ◽  
Adsorption Temperature ◽  
Naoh Solution ◽  
Adsorbent Dose

The modified reed absorbent was obtained by the being treated process with NaOH solution. The decoloration property of modified reed for alkaline fuchsin was studied under different conditions. The effects of adsorbent dose, adsorption temperature, adsorption time and pH value on the decoloration property were investigated, and the optimal adsorption condition was gotten,, the discoloration rate was above 95%. The adsorption isotherm was well represented by the Langmuir.

Pseudo-Second-Order Kinetics for the Adsorption of Uranyl Ion onto Peat at Different pH Value

2010 ◽  
Vol 113-116 ◽  
pp. 33-36
Author(s):  
Zhi Rong Liu ◽  
Qin Qin Tao ◽  
Chuan Xi Wen
Keyword(s):  
Contact Time ◽  
Adsorption Process ◽  
Adsorption Equilibrium ◽  
Ph Value ◽  
Second Order ◽  
Uranyl Ions ◽  
Batch Tests ◽  
Effects Of Ph ◽  
Pseudo Second Order

Batch tests were used to investigate the effects of pH and contact time on the adsorption capability of peat. The results indicate that adsorption of uranyl ions on peat increase with increasing pH from 1 to 5. However it takes longer contact time to reach the adsorption equilibrium with increase of pH from 1 to 5. The adsorption process can be described by type 1 of the pseudo-second-order kinetics excellently.

Research on Influence Factors of Bamboo Charcoal Adsorb Ammonia Nitrogen in Wastewater

2011 ◽  
Vol 356-360 ◽  
pp. 493-497 ◽  
Author(s):  
Zong Ning Li ◽  
Zong Qiang Zhu ◽  
Mei Na Liang ◽  
Hong Dong Qin ◽  
Yi Nian Zhu
Keyword(s):  
Ph Value ◽  
Influence Factors ◽  
Ammonia Nitrogen ◽  
Bamboo Charcoal ◽  
Solution Ph ◽  
Adsorption Ability ◽  
Adsorption Time ◽  
Initial Concentration ◽  
Adsorption Temperature ◽  
Better Than

The influences of adsorption temperature, adsorption time, dosing quantity, adsorption environment pH value, initial concentration and bamboo charcoal type on adsorption of bamboo charcoal adsorb ammonia nitrogen in wastewater are studied. The result shows that the maximum adsorption values are 1.1715 mg/g and 0.9115 mg/g respectively at 25°C and 40°C. Bamboo charcoal can easily absorb ammonia nitrogen at low temperature condition. 180 min is a suitable adsorption time. Increasing bamboo charcoal dosing quantity is helpful to improve efficiencies of ammonia nitrogen removal in wastewater, but the adsorption capacity is declining as bamboo charcoal dosing quantity increasing. Solution pH value has a great impact on the adsorbed amount, the adsorbed effect in alkaline solution is much better than in acid one’s. The adsorption ability of the moderate temperature bamboo charcoal is higher than the high temperature one’s.

Study on the Effect of Amphoteric Bagasse Hemicellulose on Heavy Metal Adsorption

2011 ◽  
Vol 399-401 ◽  
pp. 1282-1288 ◽  
Author(s):  
Li Jun Wang ◽  
Xin Liang Liu ◽  
Meng Ling Weng ◽  
Shuang Xi Li ◽  
Fu Sheng Wu ◽  
...  
Keyword(s):  
Linear Model ◽  
Metal Ion ◽  
Ph Value ◽  
Absorption Capacity ◽  
Heavy Metal Adsorption ◽  
Adsorption Dynamics ◽  
Adsorption Time ◽  
Initial Concentration ◽  
Ph Values ◽  
Pseudo Second Order

In this paper, ions i.e. Cu2+, Pb2+and Cd2+ were absorbed by the amphoteric bagasse hemicelluloses, and the influences of pH value, adsorption time and the initial concentration of metal ion have been studied. The results show that the optimal adsorption pH values for Cu2+, Pb2+ and Cd2+ are 6.5, 6.0 and 7.5, respectively. The adsorption capacity to ions Cu2+, Pb2+ and Cd2+ reaches the maximum values when the adsorption time is 180 min. Net adsorption to ions Cu2+, Pb2+ and Cd2+ increases with increasing the initial concentration of the metal ions. Analysis results of adsorption dynamics show that the adsorption of Cu2+, Pb2+ and Cd2+ follows Ho 's Pseudo second-order kinetics linear model. It can be seen from the adsorption isothermal research that absorption of the amphoteric bagasse hemicelluloses to ions Cu2+, Pb2+and Cd2+ can be well described by the Langmuir isotherm linear model. Moreover, the theoretical values of the maximum absorption capacity qmax for ions Cu2+, Pb2+ and Cd2+ were determined to be 21.98 mg/g, 81.97 mg/g and 31.85 mg/g, respectively.

Adsorption Behavior of Acid Orange 7 by Crosslinked Cationic Starch

2012 ◽  
Vol 518-523 ◽  
pp. 1724-1728
Author(s):  
Min Zhang ◽  
Xue Zhang ◽  
Ben Zhi Ju ◽  
Shu Fen Zhang
Keyword(s):  
Acid Orange 7 ◽  
Cationic Starch ◽  
Order Model ◽  
Adsorption Time ◽  
Initial Concentration ◽  
Acid Orange ◽  
Cationic Group ◽  
Adsorption Temperature ◽  
Initial Ph ◽  
Pseudo Second Order

A series of crosslinked cationic starches with different degree of substitution(DS) are used to adsorb Acid Orange 7. Some factors, such as pH, adsorption time, adsorption temperature, initial concentration of dye, dose of cationic starch and DS of cationic group are investigated. The results show that the adsorption quickly establish equilibrium within 15 min. The adsorption capacity of the dye increases with the increasing of DS of the crosslinked cationic starches.The initial pH of 2-10 is reasonable. The adsorption of the dye on the crosslinked cationic starch is well described with the pseudo-second-order model and the Langmuir isotherm.

Adsorption of Cesium from Aqueous Solution by Modified Montmorillonite

2013 ◽  
Vol 395-396 ◽  
pp. 591-594
Author(s):  
Si Man Liu ◽  
Yong Zhou Quan
Keyword(s):  
Aqueous Solution ◽  
Adsorption Capacity ◽  
Ph Value ◽  
Influence Factors ◽  
Adsorption Time ◽  
Initial Concentration ◽  
Cesium Ions ◽  
Modified Montmorillonite ◽  
Adsorption Temperature ◽  
As Adsorption

The modified montmorillonite is used to adsorb cesium ions from aqueous solution. The influence factors such as adsorption time, adsorption temperature, adsorption pH, adsorbent dosage and initial concentration was studied in the experiment. The results show the optimum adsorption time is 100 min, the best adsorption temperature is 50 °C, and pH value is 10. When the concentration of cesium ions is 160 mg/L, the adsorption capacity can be up to 9.217 mg/g.

Study on the Effect of Carboxyl Bagasse Hemicellulose on Heavy Metal Adsorption

2011 ◽  
Vol 415-417 ◽  
pp. 1630-1636 ◽  
Author(s):  
Li Jun Wang ◽  
Xin Liang Liu ◽  
Hong Xiang Zhu ◽  
Meng Ling Weng ◽  
Zhou Jun Li ◽  
...  
Keyword(s):  
Linear Model ◽  
Metal Ion ◽  
Ph Value ◽  
Absorption Capacity ◽  
Heavy Metal Adsorption ◽  
Adsorption Dynamics ◽  
Adsorption Time ◽  
Initial Concentration ◽  
Ph Values ◽  
Pseudo Second Order

In this paper, ions i.e. Cu2+, Pb2+and Cd2+ were absorbed by the carboxyl bagasse hemicelluloses, and the influences of pH value, adsorption time and the initial concentration of metal ion have been studied. The results show that the optimal adsorption pH values for Cu2+, Pb2+and Cd2+ are 5.5, 5.5 and 7.5, respectively. The adsorption capacity to ions Cu2+, Pb2+and Cd2+ reaches the maximum values when the adsorption time is 180 min. Net adsorption to ions Cu2+, Pb2+and Cd2+ increases with increasing the initial concentration of the metal ions. Analysis results of adsorption dynamics show that the adsorption of Cu2+, Pb2+and Cd2+ follows Ho 's Pseudo second-order kinetics linear model. It can be seen from the adsorption isothermal research that absorption of the carboxyl bagasse hemicelluloses to ions Cu2+, Pb2+and Cd2+ can be well described by the Langmuir isotherm linear model. Moreover, the theoretical values of the maximum absorption capacity qmax for ions Cu2+, Pb2+and Cd2+ were determined to be 20.28 mg/g, 82.64 mg/g and 30.58 mg/g, respectively.

Adsorption of Phosphorus by Ce-Modified Lithium Silica Fume

2013 ◽  
Vol 368-370 ◽  
pp. 687-691 ◽  
Author(s):  
Wei Lan Lin ◽  
Jin Chuan Gu ◽  
Wen Yuan Wang ◽  
Yu Heng Wang
Keyword(s):  
Adsorption Isotherm ◽  
Silica Fume ◽  
Adsorption Process ◽  
Ph Value ◽  
Order Kinetic ◽  
Phosphorus Adsorption ◽  
Initial Ph ◽  
Freundlich Adsorption Isotherm ◽  
Order Kinetic Model ◽  
Pseudo Second Order

This is a study about using cerium ions solution to modify lithium silica fume and the phosphorus adsorption by the modified material. The way to modify lithium silica fume and adsorption conditions has been researched. It was found that capacity of adsorption have been improved after modification by the cerium nitrate. In the adsorption test, we studied the effects of the concentration of cerium ions, the calcination temperature, the dosage, initial pH value, reaction temperature and other factors on the adsorption. The results indicated that after modifications by 3% cerium ions , calcinations at 573k, the adsorption of phosphorus can get more than 90% when modified lithium silica fume dosage is 9.6g.l-1 and the concentration of phosphorus solution is 4 mg.l-1. In addition, the Freundlich adsorption isotherm is fit for the description of the phosphorus adsorption. The phosphorus adsorption process was in accord with pseudo-second-order kinetic model.

scholarly journals Absorption of Cu(II) and Zn(II) from Aqueous Solutions onto Biochars Derived from Apple Tree Branches

Energies ◽  
2020 ◽  
Vol 13 (13) ◽  
pp. 3498
Author(s):  
Shixiang Zhao ◽  
Na Ta ◽  
Xudong Wang
Keyword(s):  
Adsorption Process ◽  
Apple Tree ◽  
Ph Value ◽  
Optimal Dosage ◽  
Initial Concentration ◽  
Surface Precipitation ◽  
Rate Limiting Step ◽  
Endothermic Process ◽  
Pseudo Second Order ◽  
Adsorption Kinetics And Isotherm

The aim of this study was to investigate the adsorption of Cu(II) and Zn(II) onto apple tree branches biochar (BC) produced at 300, 400, 500 and 600 °C (BC300, BC400, BC500, and BC600), respectively. The effect of adsorbent dosage, pH value, contact time, initial concentration of Cu(II) or Zn(II), and temperature on the adsorption process were investigated. The result showed that 5 g BC·L−1 was the optimal dosage to remove Cu(II) and Zn(II) from wastewater and the maximum adsorption efficiency was achieved at a pH of 5.0 for all the BCs when the initial concentration of Cu(II) and Zn(II) were 64 and 65 mg L−1, respectively. Adsorption kinetics and isotherm experiments showed that the pseudo-second order equation and the Langmuir isotherm could best describe the adsorption process, indicating that the adsorption of Cu(II) and Zn(II) onto BCs were monolayer processes and chemisorption was the rate limiting step. The values of ΔG0 for the absorption of Cu(II) and Zn(II) on all BCs were negative, while the values of ΔH0 were positive, suggesting that the absorption was a spontaneous endothermic process. The mechanisms of BC adsorption of metal ions adsorption include surface precipitation, ion exchange, and minor contribution by cation-π interaction. BC500 had highest Cu(II) and Zn(II) adsorption capacity under various conditions (except at pH 2.0). The maximum adsorption capacities of Cu(II) and Zn(II) on BC500 were 11.41 and 10.22 mg·g−1, respectively. Therefore, BC derived from apple tree branches produced at 500 °C can be used as an adsorbent to remove Cu(II) and Zn(II) from wastewater.

Adsorption Behavior of L-Histidine on a Novel Spherical Chitosan Adsorbent

2011 ◽  
Vol 236-238 ◽  
pp. 2574-2580
Author(s):  
Ming Hua Liu ◽  
Piao Piao Huang ◽  
Jian Yun Ou
Keyword(s):  
Adsorption Capacity ◽  
Ph Value ◽  
Equilibrium Adsorption ◽  
Solution Ph ◽  
Chitosan Beads ◽  
Adsorption Time ◽  
Initial Concentration ◽  
Adsorption Temperature ◽  
Equilibrium Adsorption Capacity ◽  
Isothermal Equation

The spherical chitosan adsorbent was prepared by graft copolymerization of acrylic acid onto the cross-linked spherical chitosan beads, and then was adopted to adsorb the L-histidine. The adsorption conditions, i.e., solution pH, adsorption time, initial concentration and adsorption temperature were optimized. The spherical chitosan adsorbent showed excellent equilibrium adsorption capacity of 78.3 mg/g for the L-histidine when the solution pH value was 7.5, adsorption time was 180 min, initial concentration was 1500 mg/L and the adsorption temperature was 25 °C. Moreover, the inorganic salt of NaCl also showed great effect on the equilibrium adsorption capacity exceeding 0.8 mol/L. The static adsorption processes followed the Langmuir adsorption isothermal equation and Freundlich adsorption isothermal equation. Furthermore, L-histidine could be desorbed with 1.5 mol/L of ammonia solution, and the regeneration capacity of the spherical chitosan adsorbent was excellent.

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