ADSORPTIVE REMOVAL OF Cu (II) IONS BY DATE PITS: KINETIC AND EQUILIBRIUM STUDIES

2016 ◽  
Vol 15 (12) ◽  
pp. 2719-2732 ◽  
Author(s):  
Tarek E. Khalil ◽  
Hossam Altaher ◽  
Reda Abubeah
Keyword(s):  
Equilibrium Studies ◽  
Adsorptive Removal ◽  
Date Pits

scholarly journals A facile, versatile approach to hydroxyl-anchored metal oxides with high Cr(VI) adsorption performance in water treatment

2016 ◽  
Vol 3 (11) ◽  
pp. 160524 ◽  
Author(s):  
Ji Ma ◽  
SiZhi Zuo-Jiang ◽  
Yunhao He ◽  
Qinglei Sun ◽  
Yunguo Wang ◽  
...  
Keyword(s):  
High Performance ◽  
Hydroxyl Groups ◽  
High Concentration ◽  
Equilibrium Studies ◽  
Surface Hydroxyl ◽  
Adsorptive Removal ◽  
Surface Hydroxyl Groups ◽  
High Maximum ◽  
Ph Range ◽  
Hydroxyl Protons

In this study, a facile and versatile urea-assisted approach was proposed to synthesize Chinese rose-like NiO, pinecone-like ZnO and sponge-like CoO adsorbents. The presence of urea during syntheses endowed these adsorbents with high concentration of surface hydroxyl groups, which was estimated as 1.83, 1.32 and 4.19 mmol [OH − ] g −1 for NiO, ZnO and CoO adsorbents, respectively. These surface hydroxyl groups would facilitate the adsorption of Cr( vi ) species (e.g. HCrO 4 − , Cr 2 O 7 2− and CrO 4 2− ) from wastewater by exchanging with hydroxyl protons or hydroxide ions, and hence result in extremely high maximum adsorbed amounts of Cr( vi ), being 2974, 14 256 and 408 mg g −1 for NiO, ZnO and CoO adsorbents in the pH range of 5.02–5.66 at 298 K, respectively. More strikingly, the maximum adsorbed amounts of Cr( vi ) would be greatly enhanced as the adsorbing temperature is increased, and even amount to 23 411 mg g −1 for ZnO adsorbents at 323 K. Based on the kinetics and equilibrium studies of adsorptive removal of Cr( vi ) from wastewater, our synthetic route will greatly improve the adsorptivity of the as-synthesized metal-oxide adsorbents, and hence it will shed new light on the development of high-performance adsorbents.

Kinetic and Equilibrium Studies on Adsorptive Removal of Toluidine Blue by Water-Insoluble Starch Sulfate

2011 ◽  
Vol 56 (5) ◽  
pp. 1875-1881 ◽  
Author(s):  
Lei Guo ◽  
Guiying Li ◽  
Junshen Liu ◽  
Songmei Ma ◽  
Jinfeng Zhang
Keyword(s):  
Toluidine Blue ◽  
Equilibrium Studies ◽  
Adsorptive Removal

scholarly journals Eco-Structured Adsorptive Removal of Tigecycline from Wastewater: Date Pits’ Biochar versus the Magnetic Biochar

Nanomaterials ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 30
Author(s):  
Marwa El-Azazy ◽  
Ahmed S. El-Shafie ◽  
Saeed Al-Meer ◽  
Khalid A. Al-Saad
Keyword(s):  
Low Cost ◽  
Maximum Adsorption Capacity ◽  
Equilibrium Studies ◽  
Magnetic Biochar ◽  
Freundlich Isotherms ◽  
Bet Analysis ◽  
Pseudo Second Order ◽  
Ft Ir ◽  
Surface Chemistries ◽  
Date Pits

Non-magnetic and magnetic low-cost biochar (BC) from date pits (DP) were applied to remove tigecycline (TIGC) from TIGC-artificially contaminated water samples. Pristine biochar from DP (BCDP) and magnetite-decorated biochar (MBC-DP) were therefore prepared. Morphologies and surface chemistries of BCDP and MBC-DP were explored using FT-IR, Raman, SEM, EDX, TEM, and BET analyses. The obtained IR and Raman spectra confirmed the presence of magnetite on the surface of the MBC-DP. SEM results showed mesoporous surface for both adsorbents. BET analysis indicated higher amount of mesopores in MBC-DP. Box–Behnken (BB) design was utilized to optimize the treatment variables (pH, dose of the adsorbent (AD), concentration of TIGC [TIGC], and the contact time (CT)) and maximize the adsorptive power of both adsorbents. Higher % removal (%R), hitting 99.91%, was observed using MBC-DP compared to BCDP (77.31%). Maximum removal of TIGC (99.91%) was obtained using 120 mg/15 mL of MBC-DP for 10 min at pH 10. Equilibrium studies showed that Langmuir and Freundlich isotherms could best describe the adsorption of TIGC onto BCDP and MBC-DP, respectively, with a maximum adsorption capacity (qmax) of 57.14 mg/g using MBC-DP. Kinetics investigation showed that adsorption of TIGC onto both adsorbents could be best-fitted to a pseudo-second-order (PSO) model.

Kinetics and equilibrium studies of copper, zinc, and nickel ions adsorptive removal on to Archontophoenix alexandrae: conditions optimization by RSM

2020 ◽  
Vol 201 ◽  
pp. 289-300
Author(s):  
Raseed A. Khera ◽  
Munawar Iqbal ◽  
Aftab Ahmad ◽  
Syeda M. Hassan ◽  
Arif Nazir ◽  
...  
Keyword(s):  
Equilibrium Studies ◽  
Nickel Ions ◽  
Adsorptive Removal ◽  
Copper Zinc

Kinetic and equilibrium studies of adsorptive removal of phenol onto eggshell waste

2012 ◽  
Vol 20 (7) ◽  
pp. 4603-4611 ◽  
Author(s):  
H. Daraei ◽  
A. Mittal ◽  
M. Noorisepehr ◽  
F. Daraei
Keyword(s):  
Equilibrium Studies ◽  
Adsorptive Removal ◽  
Eggshell Waste
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