A glutamic acid-modified cellulose fibrous composite used for the adsorption of heavy metal ions from single and binary solutions

2017 ◽  
Vol 1 (11) ◽  
pp. 2317-2323 ◽  
Author(s):  
Meng Li ◽  
Zhijiang Liu ◽  
Lidong Wang ◽  
Tony D. James ◽  
Hui-Ning Xiao ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Glutamic Acid ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Fibrous Composite ◽  
Chemical Adsorption ◽  
Order Model ◽  
Binary Solutions ◽  
Pseudo Second Order ◽  
Modified Cellulose

A new glutamic acid modified cellulose fibrous composite has been developed for Cu2+ and Hg2+ adsorption. The adsorption reaction follows a pseudo-second-order model, indicating the overall rates for the adsorption on GMC are controlled by chemical adsorption.

Adsorption of Heavy Metal Ions by Chelate-Fiber Prepared by Chemical Surface Modification

2011 ◽  
Vol 308-310 ◽  
pp. 178-181
Author(s):  
Xin Liang Liu ◽  
Li Jun Wang ◽  
Yong Li Chen ◽  
Nan Chen ◽  
Shuang Fei Wang
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Optimal Process ◽  
Order Model ◽  
Chemical Surface ◽  
Adsorption Capacities ◽  
Chemical Surface Modification ◽  
Pseudo Second Order ◽  
Mechanism Of Sorption

The bagasse fibers were activated by alkalize and etherified. 1,2-ethanediamine and carbon disulfide were used to modify the etherify fiber to get the chelate-fiber contained sulfur and nitrogen. The FTIR was used to characterize the xanthated aminating-fiber (XAF). The mechanism of sorption properties for heavy metal ions were studied. As the results shown, the optimal process to prepare the XAF was that the reaction time, concentration of NaOH and dosage of CS2 was 60min, 12% and 2mL, respectively. The chelate-fiber containing sulfur and nitrogen possessed high adsorption capacities for Cu(II) and the mechanism of sorption fitted the pseudo-second-order model well.

scholarly journals WASTE FROM THE PROCESSING OF MELONS AND GOURDS AS REAGENTS FOR REMOVING POLLUTANTS FROM AQUATIC ENVIRONMENTS

2021 ◽  
pp. 129-147
Author(s):  
I.G. Shaikhiev ◽  
S.V. Sverguzova ◽  
K.I. Shaikhieva ◽  
A.V. Svyatchenko ◽  
N.A. Miroshnichenko
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Langmuir Model ◽  
Aquatic Environments ◽  
Order Model ◽  
Freundlich Model ◽  
Process Kinetics ◽  
Chemical Reagents ◽  
Pseudo Second Order

The literature data on the use of biomass and waste from the processing of melons (pumpkin, watermelon, melon, cucumber) as sorption materials for various pollutants removing from aquatic environments are summarized. It was determined that dried shells of melons and gourds are effective sorption materials for the extraction of heavy metal ions and dyes. The seeds of large fruits of melons (pumpkin, watermelon, melon), as well as their shells, also showed good sorption performance for heavy metal ions and dyes. It was revealed that most of the isotherms of the adsorption of pollutants on the processing of melons and gourds waste are most accurately described by the Langmuir model, less often by the Freundlich model, singularly by the Temkin or Dubinin-Radushkevich models. It is determined that the process kinetics in all cases follows the pseudo-second order model. To increase the adsorption characteristics of the components of melons and gourds for various pollutants, the materials were modified with various chemical reagents.

scholarly journals Using Cucurbits By-Products as Reagents for Disposal of Pollutants from Water Environments (a Literature Review)

2021 ◽  
Vol 11 (5) ◽  
pp. 12689-12705
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Logistic Model ◽  
Order Model ◽  
Freundlich Model ◽  
Chemical Reagents ◽  
Sorption Material ◽  
Pseudo Second Order ◽  
By Products

The paper summarizes data from literature sources using the waste of processing cucurbits (pumpkin, watermelon, melon, cucumber) as a sorption material to remove various pollutants from water environments. It states that cucurbits' shells are effective sorption materials for extracting heavy metal ions and dyes. Seeds of large cucurbits fruits (pumpkin, watermelon, melon) and seed shells also showed good sorption performance for heavy metal ions and dyes. It was found that most of the pollutants adsorption isotherms on cucurbits by-products are most accurately described by the Langmuir model, less often by the Freundlich model, and occasionally by the Tyomkin or Dubinin-Radushkevich models. It was determined that the adsorption process kinetics most often follows the pseudo-second-order model, less often – the logistic model. To increase the adsorption characteristics of cucurbits fruit components for various pollutants, they were modified with various chemical reagents.

Welan Gum-Modified Cellulose Bead as an Effective Adsorbent of Heavy Metal Ions (Pb2+, Cu2+, and Cd2+) in Aqueous Solution

2014 ◽  
Vol 49 (7) ◽  
pp. 1096-1103 ◽  
Author(s):  
Jing Liu ◽  
Tong-Hui Xie ◽  
Chun Deng ◽  
Kai-Feng Du ◽  
Na Zhang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Welan Gum ◽  
Cellulose Bead ◽  
Modified Cellulose

scholarly journals 1,2,3,4-Tetrahydropyrimidine Derivative for Selective and Fast Uptake of Cadmium Ions from Aqueous Solution

Environments ◽  
2019 ◽  
Vol 6 (6) ◽  
pp. 68
Author(s):  
Mohamed Ould M’hamed ◽  
Lotfi Khezami
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Adsorption Kinetics ◽  
Heavy Metal Ions ◽  
Freundlich Isotherm ◽  
Second Order ◽  
Solution Interface ◽  
Adsorption Data ◽  
Pseudo Second Order ◽  
Thermodynamic Variables

The aim of this work was to evaluate the performance of a 1,2,3,4-tetrahydropyrimidine derivative as a powerful heterocyclic compound for the elimination of Cd(II) ions from aqueous solutions. The tetrahydropyrimidine derivative was prepared during 30 min of milling by planetary ball mill with a ball-to-powder mass ratio of 8:1 and a rotation speed of 750 rpm. Nuclear magnetic resonance (NMR) and infrared (IR) were used to identify the obtained tetrahydropyrimidine derivatives. Furthermore, batches of experiments were carried out to establish the adsorption equilibrium, kinetics, and thermodynamic variables of the tetrahydropyrimidine derivatives for toxic heavy Cd(II) ions. The adsorption data were simulated by applying the Langmuir manner, the Freundlich equation, the pseudo-first-order and pseudo-second-order equations. The adsorption procedure was discovered to be very influenced by PH. The removal of heavy metal ions reached a maximum value quickly within 6 min and the adsorption data better adjusted the Langmuir isotherm than that of the Freundlich isotherm. The maximum Cd(II) ions adsorption capacity was approximated to be 151.16 mg g−1 at 328 K and a pH of 6 to 7. It was found that the adsorption kinetics of Cd(II) ions obeyed pseudo-second-order adsorption kinetics. The examination of the thermodynamic variables of tetrahydropyrimidine derivative showed a spontaneous endothermic adsorption procedure. Otherwise, positive entropy values put forward a rise in the randomness at the solid-solution interface when heavy metal ions are adsorbed.

scholarly journals Simultaneous removal of lead, copper, cadmium, nickel, and cobalt heavy metal ions from the quinary system by Abies bornmulleriana cones

2020 ◽  
Vol 82 (12) ◽  
pp. 3032-3046
Author(s):  
Ensar Oguz
Keyword(s):  
Experimental Data ◽  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Metal Removal ◽  
Bet Surface Area ◽  
Order Model ◽  
Average Pore ◽  
Quinary System ◽  
Before And After

Abstract Abies bornmulleriana cone was used to investigate its biosorption efficiency and capacity of Pb2+, Cu2+, Cd2+, Co2+, and Ni2+ heavy metal ions in a quinary system. The mechanism of multi-metal removal was illustrated in terms of FTIR results. Electrophoretic mobilities of the biosorbents were determined to access the information about the competitive biosorption. BET surface area and pore volume of the biosorbents before and after the biosorption were defined to be (5.05 m2 g−1 and 0.0018 cm3 g−1) and (0.97 m2 g−1 and 0.00032 cm3 g−1), respectively. The average pore width of the biosorbent before and after the biosorption was calculated as 9.34 and 13.04 Å, respectively. The pseudo-first-order model and the pseudo-second-order model were applied to analyze the experimental data. Experimental data have been evaluated according to the Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich isotherms. The maximum biosorption efficiency and capacity for Pb2+, Cu2+, Cd2+, Ni2+, and Co2+ ions were defined as (85.4, 56.4, 35.4, 21.7 and 18.9%) and (8.5, 5.6, 3.5, 2.2 and 1.9 mg g−1), respectively. The selectivity of heavy metal ions resulted in the magnitude order of Pb2+ > Cu2+ > Cd2+ > Ni2+ > Co2+.

Kinetics and Adsorption Ions of Heavy Metal by Modified Alumino-Silicates

2021 ◽  
Vol 316 ◽  
pp. 170-174
Author(s):  
Elena G. Filatova ◽  
Yury N. Pozhidaev
Keyword(s):  
Heavy Metal ◽  
Rate Constant ◽  
Heavy Metal Ions ◽  
Second Order ◽  
Adsorption Rate ◽  
Order Model ◽  
Adsorption Rate Constant ◽  
Maximum Value ◽  
Pseudo Second Order ◽  
Kinetics Of

Adsorption isotherms of Ni (II) and Cu (II) ions by alumino-silicates, modified with N, N'-bis (3-triethoxysilylpropyl) thiocarbamide (BTM-3), and HCl, were obtained. The adsorption kinetics of heavy metal ions is studied, using the kinetic pseudo-first and pseudo-second order models. It is shown that, when alumino-silicates are modified, the rate and energy of adsorption increase. It is established that the kinetics of the adsorption of the studied ions is best described by a pseudo-second order model. The maximum value of the adsorption rate constant of 33.7∙10-5 g/ (mmol min) corresponds to nickel (II) ions for alumino-silicates, modified with HCl. The maximum value of the adsorption rate constant value of 2.91∙10-5 g/ (mmol min) for alumino-silicates, modified with BTM-3, corresponds to Cu (II) ions.

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