Adsorption Behaviors of Acid Dyes by Water-Insoluble Crosslinked Cationic Starch

2014 ◽  
Vol 522-524 ◽  
pp. 552-559
Author(s):  
Min Zhang ◽  
Ben Zhi Ju ◽  
Shu Fen Zhang ◽  
Xue Zhang ◽  
Zhi Hua Cui
Keyword(s):  
Adsorption Capacity ◽  
Acid Dyes ◽  
Cationic Starch ◽  
Order Model ◽  
Dry Process ◽  
Adsorption Behaviors ◽  
Initial Ph ◽  
Pseudo Second Order ◽  
Acid Red 1 ◽  
Kinetics Of

This paper presents a study on the adsorption of structurally different C.I. Acid Red 1(AR-1) and C.I. Acid Yellow 4(AY-4) from aqueous solution by a series water-insoluble crosslinked cationic starches with different degrees of substitution (DS) synthesized by a dry process. The adsorption quickly establish equilibrium within 15 min. The effective adsorption took place at the initial pH of 2-10 and pH of 2-8 for AR-1 and AY-4, respectively. The adsorption capacity of the two acid dyes increased with the increasing of DS of the crosslinked cationic starches. The adsorption capacity of AY-4 was almost two times higher than that of AR-1 under the present conditions. It was found that the adsorption kinetics of the two acid dyes on the crosslinked cationic starch was well described with the pseudo-second-order model (R2>0.99). Further, the Langmuir isotherm agreed well with the experimental data (R2>0.99). Besides, the thermodynamic parameters are shown.

Research of Adsorption Performance of V (V) and Mo (VI) on Collagen Fiber Immobilized Bayberry Tannin

2012 ◽  
Vol 189 ◽  
pp. 69-74
Author(s):  
Wei Hu ◽  
Zhen Zhang ◽  
Hui Yun Liu ◽  
Ru Wang
Keyword(s):  
Adsorption Capacity ◽  
Collagen Fiber ◽  
Rate Model ◽  
Desorption Process ◽  
Adsorption Performance ◽  
Adsorption Behaviors ◽  
Freundlich Equation ◽  
Adsorption Capacities ◽  
Pseudo Second Order ◽  
Kinetics Of

The adsorption behaviors of V(V) and Mo(VI) on the collagen fiber immobilized bayberry tannin (IBT), a new kind of adsorption, were investigated. It was found that at 323K, pH=2.0, the adsorption capacities of V(V) on 0.100g adsorbent was 1.03mmol/g in 100ml of 1.960mmol/L V(V) solution, and that of Mo(VI) was 0.86mmol/g at 323K, pH=4.0, with 100ml of 1.042 mmol/L Mo(VI) solution. The effect of pH on the adsorption capacity of V(V) and Mo(VI) was conspicuous. The adsorption capacity of Mo(VI) decreased with pH increasing, and the maximal adsorption capacity of V(V) was observed at pH4.0. Langmuir equation was used for the description of adsorption isotherms of V(V), while Freundlich equation could be well described that of Mo(VI). The adsorption kinetics of V(V) and Mo(VI) can be well described by the pseudo-second-order-rate model and the adsorption capacities calculated by this model are very close to those experimentally determined. The adsorbent can be regenerated by using 0.1mol/L HCl and 0.02mol/L EDTA in tune as desorption agent after the adsorption of V(V) and Mo(VI). In the desorption process V(V) and Mo(VI) were utilized respectively. These facts implies that the adsorbent can be used for the separation of V(V) and Mo(VI) in aqueous.

Adorption and Kinetics Studies of Baritite on Cr (VI) from Aqueous Solutions

2011 ◽  
Vol 347-353 ◽  
pp. 281-284
Author(s):  
Peng Ge ◽  
Li Juan Wan ◽  
Ya Jing Xu
Keyword(s):  
Experimental Data ◽  
Aqueous Solutions ◽  
Adsorption Capacity ◽  
Adsorption Kinetics ◽  
Natural Zeolite ◽  
Second Order ◽  
Order Model ◽  
Kinetics Studies ◽  
Pseudo Second Order ◽  
Kinetics Of

Among the investigated clays and minerals (kaolinite, natural zeolite, manual zeolite, bentonite, sepiolite, sepiolite amianthus, tremolite amianthus, vermiculite and baritite), the baritite clay was selected as the optimal adsorbent for aqueous Cr (VI). The Cr (VI) adsorption capacity on baritite clay reached as high as 39.01 mg∙g−1 at 20°C. Then the adsorption kinetics of Cr (VI) by the baritite clay were investigated in details. Results showed that the pseudo-second-order model was a suitable description for the adsorption kinetics and fitted well with the experimental data.

Adsorption Characters of Mn2+ onto Palygorskites Modified by 1, 10-Phenanthroline and Triethylamine

2010 ◽  
Vol 178 ◽  
pp. 8-16
Author(s):  
Liang Dong Feng ◽  
Bo Qing Chen ◽  
Ying Ying Shi ◽  
Ying Wei Guo ◽  
Jing Huang ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Contact Time ◽  
Ph Value ◽  
Order Model ◽  
Kinetics Of Adsorption ◽  
Initial Concentration ◽  
Adsorption Capacities ◽  
Pseudo Second Order ◽  
Ft Ir ◽  
Kinetics Of

1, 10-phenanthroline and triethylamine modified palygorskites were prepared by microwave irradiation, and characterized with FT-IR technique. The effects of contact time, adsorbent dosage, and pH value of the initial solution on the adsorption characters of Mn2+ were investigated. The adsorption of Mn2+ from aqueous solutions using 1, 10-phenanthroline or triethylamine modified palygorskites were investigated. Experiment results indicated that 1,10-phenanthroline and triethylamine molecules have been successfully grafted to palygorskite. The adsorption was rapid during the first 5 minuts and equilibrium were attained within 60 minutes in the initial concentration of Mn2+ of 50 and 100 mg•L-1, and fast adsorption in the first 10 minutes and slowly increased with the contact time due to the adsorption of palygorskite. The 1, 10-phenanthroline modified palygorskites had higher adsorption capacity than triethylamine modified palygorskites. Compared with natural palggorskites, the Mn2+ ions adsorption capacities of palggorskite modified by 1, 10-phenanthroline or triethylamine were significantly improved. There were less difference in the adsorption capacity between different dasages of 1, 10-phenanthroline modified palygorskites, but the adsorption capacity of Mn2+ adsorbed onto triethylamine modified palygorskites decreased with increasing the dosages. A Lagergren pseudo-second order model best described the kinetics of adsorption of Mn2+ onto the modified palygorskites.

Removal of sunset yellow FCF from aqueous solution using polyethyleneimine-modified MWCNTs

2015 ◽  
Vol 73 (6) ◽  
pp. 1269-1278 ◽  
Author(s):  
Hejun Gao ◽  
Luanluan Zhang ◽  
Yunwen Liao
Keyword(s):  
Adsorption Capacity ◽  
Contact Time ◽  
Adsorption Mechanism ◽  
Adsorption Process ◽  
Langmuir Model ◽  
Order Model ◽  
Sunset Yellow ◽  
Multi Wall Carbon Nanotubes ◽  
Initial Ph ◽  
Pseudo Second Order

A novel adsorbent consisting of polyethyleneimine-modified multi-wall carbon nanotubes (PEI-MWCNTs) was synthesized by grafting PEI on the carboxyl MWCNTs. The surface properties of the PEI-MWCNTs were measured by scanning electron microscopy, thermogravimetric analysis, Fourier transform infrared, and zeta potential. The adsorption behavior of the PEI-MWCNTs was investigated using sunset yellow FCF as adsorbate. The effects of dosage of adsorbent, the initial pH of solution, contact time and temperature on the adsorption capacity were studied. Then, the kinetics and thermodynamics of the adsorption process were further investigated. Experimental results showed that the adsorption kinetics fitted a pseudo-second-order model and the adsorption isotherms agreed well with the Langmuir model. The adsorption process occurred very fast and the adsorption capacity of PEI-MWCNTs was much higher than that of many of the previously reported adsorbents. Additionally, the plausible adsorption mechanism was discussed.

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 Behaviors of Oxytetracycline on Synthetic Resins

2013 ◽  
Vol 726-731 ◽  
pp. 573-576 ◽  
Author(s):  
Meng Qiao Wang ◽  
Xiao Han Liu ◽  
Liu Yan Wu ◽  
Ai Min Li
Keyword(s):  
Particle Size ◽  
Total Pore Volume ◽  
Ionic Concentration ◽  
Order Model ◽  
Equilibrium Time ◽  
Adsorption Behaviors ◽  
Synthetic Resins ◽  
Pseudo Second Order ◽  
Kinetics Of ◽  
The Ideal

Three commercial resins (NDA150, NDA88 and NDA77) with different physicochemical properties were selected to investigate the adsorption behavior and primary factors controlling the adsorption of oxytetracycline (OTC) onto the resins. The adsorption kinetics of OTC onto all resins were fitted well to pseudo-second-order model. NDA150 had the largest adsorption capacity due to its higher surface area and larger total pore volume. Moreover, all of the three resins exhibited nearly the same equilibrium time because of their nearly the same particle size. The suitable pH for the effective adsorption of NDA150 and NDA77 is from 4 to 7, while the ideal pH for NDA88 is 10. OTC adsorption on all of the three resins increased with the increasing ionic concentration.

Adsorption Characteristics of Congo Red from Aqueous Solution on the Carboxymethylcellulose/Montmorillonite Nanocomposite

2012 ◽  
Vol 450-451 ◽  
pp. 769-772 ◽  
Author(s):  
Ya Hong Zhao ◽  
Li Wang
Keyword(s):  
Adsorption Capacity ◽  
Adsorption Kinetics ◽  
Congo Red ◽  
Ph Value ◽  
Contact Temperature ◽  
Solution Intercalation ◽  
Adsorption Behaviors ◽  
Initial Ph ◽  
Pseudo Second Order ◽  
Kinetics And Isotherms

The carboxymethylcellulose/montmorillonite (CMC/MMT) nanocomposite was prepared by a solution intercalation technique. The effects of contact temperature, the initial pH value of dye solution, contact time and the initial dye concentration on the adsorption capacitiy of CMC/MMT nanocomposite for Congo red (CR) were investigated. The adsorption kinetics and isotherms of nanocomposite were also studied. The results indicated that with the contact temperature increasing and the initial pH value decreasing, the adsorption capacity of the CMC/MMT nanocomposite increased. Compared with the adsorption capacity of CMC (62.42 mg/g), the nanocomposite exhibited the higher adsorption capacity (161.08 mg/g). The adsorption behaviors of CMC/MMT nanocomposite showed that the adsorption kinetics and isotherms were in good agreement with pseudo-second-order equation and the Langmuir equation.

Adsorption Characteristics of Pb2+ from Aqueous Solution on the Corn Stalk/montmorillonite Nanocomposite

2013 ◽  
Vol 295-298 ◽  
pp. 438-442
Author(s):  
Xiao Li Wang ◽  
Lixiang Wang ◽  
Huijuan Wang
Keyword(s):  
Adsorption Capacity ◽  
Adsorption Kinetics ◽  
Ph Value ◽  
Corn Stalk ◽  
Solution Intercalation ◽  
Adsorption Behaviors ◽  
Freundlich Equation ◽  
Initial Ph ◽  
Pseudo Second Order ◽  
Kinetics And Isotherms

The corn stalk/montmorillonite(CS/MMT) nanocomposite was prepared by a solution intercalation technique. The effects of the initial pH value of Pb2+ solution, contact time and the dosage of adsorbent on the adsorption capacitiy of CS/MMT nanocomposite for Pb2+ were investigated. The adsorption kinetics and isotherms of nanocomposite were also studied. The results indicated that with the initial pH value increasing, the adsorption capacity of the CS/MMT nanocomposite increased. Compared with the adsorption capacity of CS (6.32 mg/g), the nanocomposite exhibited the higher adsorption capacity (31.95 mg/g). The adsorption behaviors of CS/MMT nanocomposite showed that the adsorption kinetics was in accorded with pseudo-second-order equation and the adsorption isotherms followed the Langmuir and Freundlich equation.

scholarly journals Husk of Agarwood Fruit-Based Hydrogel Beads for Adsorption of Cationic and Anionic Dyes in Aqueous Solutions

Molecules ◽  
2021 ◽  
Vol 26 (5) ◽  
pp. 1437
Author(s):  
Chih Ming Ma ◽  
Bo-Yuan Yang ◽  
Gui-Bing Hong
Keyword(s):  
Aqueous Solutions ◽  
Selective Adsorption ◽  
Order Model ◽  
Anionic Dyes ◽  
Adsorption Selectivity ◽  
Hydrogel Beads ◽  
Batch System ◽  
Initial Ph ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order

Hydrogel beads based on the husk of agarwood fruit (HAF)/sodium alginate (SA), and based on the HAF/chitosan (CS) were developed for the removal of the dyes, crystal violet (CV) and reactive blue 4 (RB4), in aqueous solutions, respectively. The effects of the initial pH (2–10) of the dye solution, the adsorbent dosage (0.5–3.5 g/L), and contact time (0–540 min) were investigated in a batch system. The dynamic adsorption behavior of CV and RB4 can be represented well by the pseudo-second-order model and pseudo-first-order model, respectively. In addition, the adsorption isotherm data can be explained by the Langmuir isotherm model. Both hydrogel beads have acceptable adsorption selectivity and reusability for the study of selective adsorption and regeneration. Based on the effectiveness, selectivity, and reusability of these hydrogel beads, they can be treated as potential adsorbents for the removal of dyes in aqueous solutions.

Study on the Formaldehyde Adsorption Kinetics of Dry Waters

2014 ◽  
Vol 809-810 ◽  
pp. 907-911
Author(s):  
Jun Long Wang ◽  
Jie Hou ◽  
Ting Jiang ◽  
Yong Jun He ◽  
Yao Dong Liang
Keyword(s):  
Adsorption Kinetics ◽  
High Speed ◽  
Adsorption Process ◽  
Average Diameter ◽  
Adsorption Rate ◽  
Absorption Kinetics ◽  
Order Model ◽  
Pseudo Second Order ◽  
Kinetics Of ◽  
Formaldehyde Adsorption

Dry waters with an average diameter of 82 μm were prepared by a high speed mixed route. The formaldehyde absorption kinetics of dry waters was investigated by simulating indoor formaldehyde pollution in glass chamber. The results showed that pseudo-second order model could be used to simulate the adsorption process; the adsorption rate was highest in the initial 60 minutes; when the adsorption lasted for 180 minutes, the adsorption reached equilibrium.

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