Single and competitive sorption potential of date seed‐derived biochar during removal of lead ( II ) and cadmium ( II ) ions

2021 ◽  
Author(s):  
K. Saravanakumar ◽  
B.S. Naveen Prasad ◽  
R. Senthilkumar ◽  
D.M. Reddy Prasad ◽  
D. Venkatesan
Keyword(s):  
Competitive Sorption ◽  
Date Seed ◽  
Sorption Potential

Kinetics and equilibrium of the sorption of bisphenol A by carbon nanotubes from wastewater

2013 ◽  
Vol 68 (6) ◽  
pp. 1306-1314 ◽  
Author(s):  
J. Bohdziewicz ◽  
G. Kamińska
Keyword(s):  
Carbon Nanotubes ◽  
Bisphenol A ◽  
Nitrogen Adsorption ◽  
Second Order ◽  
Synthetic Wastewater ◽  
Competitive Sorption ◽  
Outer Diameter ◽  
Graphene Layers ◽  
Pseudo Second Order ◽  
Sorption Potential

The aim of this study was to determine the sorption potential of carbon nanotubes (CNTs) to bisphenol A (BPA) contained in synthetic wastewater whose composition corresponds to biologically treated effluents. These nanotubes differed in their outer diameter, the number of graphene layers and the presence of modifying functional groups. Based on the nitrogen adsorption–desorption isotherms, mensuration of the specific surface area and pore size distribution was undertaken. The porous structure of the CNTs was bidispersive; the majority consisted of micropores, there was an average fraction of mesopores, and macropores did not occur. On the basis of common kinetics models (pseudo-first-order and pseudo-second-order models), a trial of modelling the kinetics of BPA sorption onto nanotubes was undertaken. The experimental data were well fitted only to the pseudo-second-order models. The kinetics study indicated that adsorption of BPA on CNTs proceeded very fast, with the majority of the adsorbate being adsorbed in the first few seconds. The sorption capacity of nanotubes to BPA was the highest for single-walled CNTs. A decrease in the sorption potential of the nanotubes for higher pH values occurred as a result of the deprotonation of the BPA and formation of bisphenolate anions, consequently leading to a decrease of π–π (hydrophobic) interaction and enhancing electrostatic repulsion. Overall, these results unequivocally confirm the ideal performance and potential of nanotubes for removal of micropollutants from synthetic wastewater. Replicating the conditions occurring in real wastewater allows us to expect a high sorption of BPA in real competitive sorption systems.

COMPETITIVE SORPTION OF FLORESCENT DYE AND GROUNDWATER CONTAMINANTS ON GRANULAR ACTIVATED CARBON

2019 ◽  
Author(s):  
Myron Malisse Lummus ◽  
◽  
Brady A. Ziegler ◽  
Geary M. Schindel
Keyword(s):  
Activated Carbon ◽  
Granular Activated Carbon ◽  
Competitive Sorption ◽  
Groundwater Contaminants

Modeling of sorption kinetics of U(VI) micro-quantities nanostructured materials with anatase mesoporous structures

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Veniamin Zheleznov ◽  
Aleksey Golikov ◽  
Tatiana Sokolnitskaya ◽  
Sergey Ivannikov
Keyword(s):  
Nanostructured Materials ◽  
Sorption Kinetics ◽  
Uranyl Ion ◽  
Competitive Sorption ◽  
Hydroxyl Groups ◽  
Complex Ions ◽  
The Stability ◽  
Kinetics Of ◽  
Mesoporous Structures ◽  
Ionic Forms

Abstract The sorption kinetics of uranyl ions micro-quantities from fluoride solutions by nanostructured materials with anatase mesoporous structures has been studied. Using the model of competitive sorption of ions and positively charged complexes of uranyl ion on deprotonated hydroxyl groups of an anatase, kinetic curves of changes in the ratio of ionic forms of uranium in solution were calculated. Modeling was carried out under the assumption of a two-stage mechanism of uranium complex ions sorption. The modeling considered the influence of the uranyl ion carbonate complexes formation. The shift in equilibrium among ionic forms of uranyl correlates with the stability of the complexes in solution.

Sorption of phenols on hexadecyltrimethylammonium- modified bentonite: Application of Polanyi−Manes potential theory

2020 ◽  
pp. 0958305X2097728
Author(s):  
Jiyeon Choi ◽  
Dong-Ik Slong ◽  
Won Sik Shin
Keyword(s):  
Molar Volume ◽  
Potential Theory ◽  
Characteristic Curve ◽  
Chemical Compositions ◽  
Pore Filling ◽  
Sorption Data ◽  
Similar Chemical ◽  
Competitive Model ◽  
Sorption Potential ◽  
Sorption Systems

This study investigated the sorption of phenol and 4-chlorophenol (4-CP) on natural bentonite modified with hexadecyltrimethylammonium (HDTMA) cation. The Freundlich, Langmuir, Dubinin−Radushkevich (DR), Sips, and Polanyi−Dubinin−Manes (PDM) models fitted the sorption data well (R2 > 0.92). The Freundlich coefficient and the maximum sorbed amount of the Langmuir and PDM models of 4-CP were higher than phenol because of higher hydrophobicity (log Kow = 2.39 for 4-CP and 1.46 for phenol). The PDM model that includes solubility and molar volume was highly useful in predicting the sorption of phenols having widely different hydrophobicity and solubility. The characteristic curves, the plot of sorbed volume ( qv) versus the sorption potential per molar volume ( ε/ Vm) of 4-CP and phenol were distinctly different although they have similar chemical compositions. The selectivity of 4-CP (3.72) was higher than that of phenol (0.27) in binary sorption systems. The sorbed volume ( qv) in the binary sorption was remarkably reduced and the characteristic curve had wider distribution owing to competition in pore-filling. The sorption behaviors were elucidated by partitioning and pore-filling mechanisms. Among the tested binary sorption models, the modified Langmuir competitive model was the best in the prediction of the binary sorption (R2 > 0.98).

Hierarchical Hydroxyapatite Microspheres Composed of Nanorods and Their Competitive Sorption Behavior for Heavy Metal Ions

2012 ◽  
Vol 2012 (16) ◽  
pp. 2665-2668 ◽  
Author(s):  
Ronghai Zhu ◽  
Xiaoyong Lai ◽  
Jonathan E. Halpert ◽  
Ranbo Yu ◽  
Dan Wang
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Sorption Behavior ◽  
Competitive Sorption

DATE SEED OIL: PHENOLIC, TOCOPHEROL AND STEROL PROFILES

2004 ◽  
Vol 11 (4) ◽  
pp. 251-265 ◽  
Author(s):  
SOUHAIL BESBES ◽  
CHRISTOPHE BLECKER ◽  
CLAUDE DEROANNE ◽  
NEILA BAHLOUL ◽  
GEORGES LOGNAY ◽  
...  
Keyword(s):  
Seed Oil ◽  
Date Seed

Mechanistic insights into the ultra-deep desulfurization of liquid fuel on date-seed derived hierarchical porous carbon

2021 ◽  
Vol 26 ◽  
pp. 101413
Author(s):  
Saheed A. Ganiyu ◽  
Oluwole Ajumobi ◽  
Abdulkadir Tanimu ◽  
Ismail Abdulazeez ◽  
Salawu Omobayo Adio ◽  
...  
Keyword(s):  
Porous Carbon ◽  
Liquid Fuel ◽  
Hierarchical Porous Carbon ◽  
Date Seed ◽  
Deep Desulfurization ◽  
Hierarchical Porous

Evaluation of tendering effect from date seed extract (P. dactalytera) in knuckle part meat

2021 ◽  
Vol 6 (1) ◽  
pp. 23-26
Author(s):  
Maryana Mohamad Nor ◽  
Lukman Ismail ◽  
Siti Nuurul Huda Mohammad Azmin ◽  
Ikhmal Hisham Abdul Halim
Keyword(s):  
Sensory Evaluation ◽  
Aqueous Extract ◽  
Animal Feed ◽  
Ph Value ◽  
Total Yield ◽  
Chemical Properties ◽  
Positive Control ◽  
Date Seed ◽  
Physico Chemical ◽  
Cooked Meat

Phoenic dactylifera (date) is a species of flowering plants in the family of Arecaceae. Date seeds are considered as a waste from many processing that produced plants pitted date, confectionery date syrup and date itself. Currently, the seeds are used mainly for animal feed in the cattle and chicken industry. In 2004, about 863,000 tonnes of date seeds are produced out of 6.9 million tonnes date. Tenderness is the major concern that affecting consumer acceptance of beef in meat industry. This study was carried out in order to investigate the effects of the bioactive compound extracted from date seed as a tenderizing agent in meat. Extraction of date seeds used a different method of extraction (Soxhlet and Maceration). The application of extracted on knuckle part of beef were performed and papain was used as a positive control and followed by the sensory evaluation. The analysis of cooked meat was performed in order to analyze the physico-chemical properties of date seeds extract. The result from the study revealed that the aqueous extract (maceration techniques) gave the best percentage of the total yield recovery with 28.44%. The physico-chemical properties of cooked meat showed the reducing of pH value after cooking. Meanwhile for the cooking yield, result showed that almost 86% of water losses during cooking for aqueous extract and positive control and 96% for negative control. According to the sensory evaluation of the cooked meat, scoring test and hedonic test were performed using One Way Anova. The result for texture is 6.10±2.1, juiceness is 5.87±1.76 and taste is 6.80±1.34. All attributes have no significant different at p <0.05 between aqueos extract, and positive control. A general acceptance shows that no significant different between aqueos extract (6.50±2.0) and positive control (7.13±1.98). The result suggested that the tenderization effect of date seed improved the textural properties of knuckle part meat and have potential for tenderization purpose in food industry.

scholarly journals Synthesis, Characterization of a New Polyacrylic Acid Superabsorbent, Some Heavy Metal Ion Sorption, the Adsorption Isotherms, and Quantum Chemical Investigation

Materials ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 4390
Author(s):  
Sevil Savaskan Yilmaz ◽  
Nuri Yildirim ◽  
Murat Misir ◽  
Yasin Misirlioglu ◽  
Emre Celik
Keyword(s):  
Heavy Metal ◽  
Quantum Chemical ◽  
Metal Ion ◽  
Molecular Mechanic ◽  
Ion Concentration ◽  
Heavy Metal Ion ◽  
Competitive Sorption ◽  
Cross Linker ◽  
The Cross

Poly(acrylic acid/Kryptofix 23-Dimethacrylate) superabsorbent polymer [P (AA/Kry23-DM) SAP] was synthesized by solution polymerization to remove Co, Ni, Cu, Cd, Mn, Zn, Pb, Cr, and Fe ions in water and improve the quality of the water. Kry23-DM cross-linker (1,4,7,13,16-Pentaoxa-10,19 diazo cyclohexene icosane di methacrylate) was synthesized using Kry23 and methacryloyl chloride. The characterization of the molecules was done by FTIR, TGA, DSC, and SEM techniques. The effects of parameters such as pH, concentration, and the metal ion interaction on the heavy metal ions uptaking of SAP was investigated. It was observed that P (AA/Kry23-DM) SAP has maximum water absorption, and the absorption increases with the pH increase. Adsorption rates and sorption capacity, desorption ratios, competitive sorption (qcs), and distribution coefficient (log D) of P(AA/Kry23-DM) SAP were studied as a function of time and pH with the heavy metal ion concentration. Langmuir and Freundlich isotherms of the P (AA/Kry23-DM) SAP were investigated to verify the metal uptake. Molecular mechanic (MM2), Assisted Model Building with Energy Refinement (AMBER), and optimized potentials for liquid simulations (OPLS) methods. were used in quantum chemical calculations for the conformational analysis of the cross-linker and the SAP. ΔH0f calculations of the cross-linker and the superabsorbent were made using Austin Model 1(AM1) method.

Competitive sorption of As(V) and Cr(VI) on carbonaceous nanofibers

2016 ◽  
Vol 293 ◽  
pp. 311-318 ◽  
Author(s):  
Wencai Cheng ◽  
Congcong Ding ◽  
Xiangxue Wang ◽  
Zhenyu Wu ◽  
Yubing Sun ◽  
...  
Keyword(s):  
Competitive Sorption
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