Effect of kinetic synergist on transport of copper(II) through a liquid membrane containing P507 in kerosene

2001 ◽  
Vol 79 (8) ◽  
pp. 1213-1219 ◽  
Author(s):  
Dingsheng He ◽  
Ming Ma ◽  
Hui Wang ◽  
Pandeng Zhou
Keyword(s):  
Activation Energy ◽  
Liquid Membrane ◽  
Copper Ions ◽  
Bulk Liquid ◽  
Liquid Membranes ◽  
Bulk Liquid Membrane ◽  
First Order ◽  
Pseudo First Order ◽  
Feed Phase ◽  
Kinetics Of

A new kinetic synergism system for copper(II) transport through a bulk liquid membrane containing mono(2-ethyhexyl)-2-ethyhexyl phosphate and Manoxol OT (OT) was examined. The influence of stripping agent, anion, pH in feed phase, and carrier concentration were investigated. The kinetics of Cu(II) transport could be analyzed in the formalism of two consecutive irreversible first-order reactions, considering both extraction and stripping. The pseudo-first-order apparent rate constants of interfacial reactions in membrane transport are determined by altering the temperature. The activation energy values are 38.1 kJ mol–1 for extraction and 32.8 kJ mol–1 for stripping. The experiments demonstrated that Manoxol OT is a good kinetic synergist for Cu(II) transport through liquid membranes in this study. The kinetic synergism of OT for extraction of Cu2+ ions is analyzed.Key words: copper ions, kinetic synergist, liquid membrane.

scholarly journals Removal of Acetaminophen Residues from Wastewater by Bulk Liquid Membrane Process

2020 ◽  
Vol 21 (4) ◽  
pp. 1-9
Author(s):  
Sawsan Abd Muslim Mohammed Albasri ◽  
Husna Salim Wahab
Keyword(s):  
Activation Energy ◽  
Carrier Concentration ◽  
Extraction Efficiency ◽  
Liquid Membrane ◽  
Volume Ratio ◽  
Bulk Liquid ◽  
Membrane Phase ◽  
Bulk Liquid Membrane ◽  
Nacl Concentration ◽  
Feed Phase

   The removal of Anit-Inflammatory drugs, namely; Acetaminophen (ACTP), from wastewater by bulk liquid membrane (BLM) process using Aliquat 336 (QCl) as a carrier was investigated. The effects of several parameters on the extraction efficiency were studied in this research, such as the initial feed phase concentration (10-50) ppm of ACTP, stripping phase (NaCl) concentration (0.3,0.5,0.7 M), temperature (30-50oC), the volume ratio of feed phase to membrane phase (200-400ml/80ml), agitation speed of the feed phase (75-125 rpm), membrane stirring speed (0, 100, 150 rpm), carrier concentration (1, 5, 9 wt%), the pH of feed (2, 4, 6, 8, 10), and solvent type (CCl4 and n-Heptane). The study shows that high extraction efficiency for ACTP of about 97% was achieved by a bulk liquid membrane at 50 ppm initial concentration of feed; stirring speed of feed phase 130 rpm; stirring speed of membrane phase 100rpm; 0.5 M NaCl concentration; carrier concentration 1wt%; volume ratio of 200ml feed:80ml membrane; feed pH of ACTP is 6,  and 50˚C. The transport kinetics was evaluated using a kinetic model with two consecutive first-order irreversible reactions. The kinetics of (ACTP) transport by bulk liquid membrane was investigated at the best experimental conditions. The activation energy values of the extraction and stripping processes were 1.733 and 1.826 kJ.mol−1. The activation energy confirms that the transport process from solutions is controlled by diffusion.

scholarly journals KINETIKA TRANSPOR Cu(II) OLEH ZAT PEMBAWA OKSIN DENGAN DAN TANPA ASAM OLEAT MELALUI MEMBRAN CAIR FASA RUAH

2015 ◽  
Vol 2 (2) ◽  
pp. 127
Author(s):  
Refinel ◽  
Emdeniz
Keyword(s):  
Activation Energy ◽  
Liquid Membrane ◽  
Copper Ions ◽  
Transport Rate ◽  
Bulk Liquid ◽  
Exit Rate ◽  
Membrane Phase ◽  
Bulk Liquid Membrane ◽  
Source Phase ◽  
Phase Transport

 Vol. 2, No. 2ABSTRACT Transport of Cu(II) ions with and without oleat acid additive through bulk liquid membrane has been fullfill the kinetic lows of consecutive irreversible first reaction by oxine as carrier in chloroform membrane. Additions of oleat acid 1.57510–3 M could increase Cu(II) transport affectivity on interface of membrane-source phase and receiving-membrane phase. Transport rate constanta value of Cu(II) ions entrance (k1) 0.0454/minute and the membrane exit rate (k2) 0.0364/minute at 301 K with activation energy 51.471 kJ/mol and without oleat acid rate constanta (k1) 0.0236/minute, (k2) 0.0193/minute with activation energy 55.2499 kJ/mol at the same condition. Keywords : bulk liquid membrane, oxine, oleat acid, copper ions    

scholarly journals PENAMBAHAN ASAM OLEAT TERHADAP Sistem transpor Cu(II) dengan zat pembawa oksin melalui teknik membran cair fasa ruah

2015 ◽  
Vol 2 (1) ◽  
pp. 45
Author(s):  
Olly Norita Tetra ◽  
Zaharasmi ◽  
Refinel
Keyword(s):  
Aqueous Solutions ◽  
Liquid Membrane ◽  
Bulk Liquid ◽  
Optimum Conditions ◽  
Membrane Phase ◽  
Bulk Liquid Membrane ◽  
Phase 0 ◽  
Interface System ◽  
Source Phase ◽  
Feed Phase

 ABSTRACT The removal of Cu(II) from aqueous solutions had been employed throught bulk liquid membrane techniques with arrange the optimization conditions of transport Cu(II) interface system. The optimum conditions of transport were found to be 3.1510-4 M of Cu(II) at pH 3  in the source phase,  17.510-4 M oxine dissolved into chloroform as membrane phase, 0,15 M H2SO4 as acceptor in  receiving phase, stirring rate was 340 rpm and  it was found that the transport of Cu(II) to receiving phase reached 97.41% during 6 hours. The effect of addition  oleat acid 1.57  10-3 M as surfactant  in membrane phase resulted a rapidly time of  transport Cu(II) to be 3 hours, wherein Cu(II) transported  into  the receive phase reached 97.83%  and remained  in feed phase 0%. Keywords: bulk liquid membrane, oxine, oleat acid, Cu(II) )transport

Kinetics and Activation Parameters for the Alkaline Aqueous Rearrangement of Trichorfon [O,O-Dimethyl-(2,2,2-Trichloro-1-Hydroxyethyl) Phosphonate] to Dichlorvos [O,O-Dimethyl-O-(2,2-Dichloroethenyl)Phosphate]

2001 ◽  
Vol 36 (3) ◽  
pp. 589-604 ◽  
Author(s):  
Julian M. Dust ◽  
Christopher S. Warren
Keyword(s):  
Activation Energy ◽  
High Pressure ◽  
Activation Parameters ◽  
Base Catalysis ◽  
Rearrangement Product ◽  
Exponential Factor ◽  
First Order ◽  
Pseudo First Order ◽  
Order Plot ◽  
Kinetics Of

Abstract The kinetics of the alkaline rearrangement of O,O-dimethyl-(2,2,2-trichloro-1- hydroxyethyl)phosphonate, (trichlorfon, 1), the active insecticidal component in such formulations as Dylox, was followed at 25±0.5°C by high pressure liquid chromatography (UV-vis detector, 210 nm). The rearrangement product, O,Odimethyl- O-(2,2-dichloroethenyl)phosphate (dichlorovos, 2), which is a more potent biocide than trichlorfon, undergoes further reaction, and the kinetics, consequently, cannot be treated by a standard pseudo-first-order plot. A two-point van't Hoff (initial rates) method was used to obtain pseudo-first-order rate constants (kѱ) at 25, 35 and 45°C: 2.6 × 10-6, 7.4 × 10-6 and 2.5 × 10-5 s-1, respectively. Arrhenius treatment of this data gave an activation energy (Ea) of 88 kJ·mol-1 with a pre-exponential factor (A) of 5.5 × 109 s-1. Kinetic trials at pH 8.0 using phosphate and tris buffer systems show no buffer catalysis in this reaction and indicate that the rearrangement is subject to specific base catalysis. Estimates are reported for pseudo-first-order half-lives for trichlorfon at pH 8.0 for environmental conditions in aqueous systems in the Corner Brook region of western Newfoundland, part of the site of a recent trichlorfon aerial spray program.

Kinetics of reconstitution of apotyrosinase by copper

1990 ◽  
Vol 68 (2) ◽  
pp. 476-479
Author(s):  
Donald C. Wigfield ◽  
Douglas M. Goltz
Keyword(s):  
Rate Constant ◽  
Copper Concentration ◽  
Copper Ions ◽  
Copper Ion ◽  
Order Rate Constant ◽  
First Order ◽  
Order Rate ◽  
Pseudo First Order ◽  
Rate Limiting ◽  
Kinetics Of

The kinetics of the reconstitution reaction of apotyrosinase with copper (II) ions are reported. The reaction is pseudo first order with respect to apoenzyme and the values of these pseudo first order rate constants are reported as a function of copper (II) concentration. Two copper ions bind to apoenzyme, and if the second one is rate limiting, the kinetically relevant copper concentration is the copper originally added minus the amount used in binding the first copper ion to enzyme. This modified copper concentration is linearly related to the magnitude of the pseudo first order rate constant, up to a copper concentration of 1.25 × 10−4 M (10-fold excess), giving a second order rate constant of 7.67 × 102 ± 0.93 × 102 M−1∙s−1.Key words: apotyrosinase, copper, tyrosinase.

scholarly journals Kinetika dan mekanisme sistem transpor Cd(II) antar fasa melalui teknik membran cair fasa ruah dengan oksin sebagai zat pembawa

2015 ◽  
Vol 1 (1) ◽  
pp. 97
Author(s):  
Zaharasmi Kahar ◽  
Djufri Mustafa ◽  
Wiwit
Keyword(s):  
Transport System ◽  
Liquid Membrane ◽  
Chloroform Solution ◽  
Bulk Liquid ◽  
Bulk Liquid Membrane ◽  
First Order ◽  
Mobile Carrier ◽  
Membrane Technique ◽  
Model Curve ◽  
Good Agreement

 ABSTRACT The transport and separation of Cd(II) through  bulk liquid membrane technique had been investigated and optimised. Cd(II) was transported  through a liquid membrane  of  chloroform solution containing oxine as mobile carrier and  received by EDTA in stripping phase. In compliance with optimum condition, the flux of Cd(II) crossing the membrane was studied, and applied further into a model of the transport system and kinetics mechanism. Concentration of Cd(II) in feed  and stripping phases were experimentally determined, and monitored by the atomic absorption spectrophotometer at lmaks 228.8 nm.  The model curve of time dependence of Cd(II) reduced concentrations in the feed, membrane and  stripping phases show good agreement and characterized as a transport system for Cd(II) interphase involved two consecutive irreversible first order reactions. The rate constant of transport at temperature 28°C are k1 0.0416 minutes-1, k2 0.0354  minutes-1 and  activation energy  32.96 kJ mol-1

scholarly journals Kinetics of Oxidation of Tryptophan by Sodium Hypochlorite

1981 ◽  
Vol 36 (3) ◽  
pp. 359-361 ◽  
Author(s):  
Thomas Rausch ◽  
Frieder Hofmann ◽  
Willy Hilgenberg
Keyword(s):  
Activation Energy ◽  
Reaction Mechanism ◽  
Sodium Hypochlorite ◽  
Arrhenius Plot ◽  
Ph Dependence ◽  
Order Conditions ◽  
Kinetics Of Oxidation ◽  
First Order ◽  
Pseudo First Order ◽  
Kinetics Of

AbstractThe oxidation of tryptophan to 3-indoleacetaldehyde with sodium hypochlorite was investigated with 14C labelled DL-tryptophan. The reaction was performed under pseudo first order conditions. From the pH dependence of the reaction it was concluded that only the unprotonated tryptophan is converted to the aldehyde. The activation energy is 35 ± 2.2 (SE) kJ x mol-1 as derived from the Arrhenius plot. Variing the pH between 8.5 and 11.0 and the temperature in the range from 298 K to 318 K did not alter the selectivity of the reaction as confirmed by TLC of the product (purity ≧ 90%). A possible reaction mechanism is proposed.

Study on the Transport Kinetics of Hg2+Through Calix‐Oligomer Bulk Liquid Membrane

2005 ◽  
Vol 42 (5) ◽  
pp. 577-586 ◽  
Author(s):  
H. Korkmaz Alpoguz ◽  
Ahmet Kaya ◽  
Aydan Yilmaz ◽  
Mustafa Yilmaz
Keyword(s):  
Liquid Membrane ◽  
Transport Kinetics ◽  
Bulk Liquid ◽  
Bulk Liquid Membrane ◽  
Kinetics Of

Kinetics of Mercury(II) Transport Through a Bulk Liquid Membrane Containing Calix[4]arene Derivatives as Carrier

2003 ◽  
Vol 38 (7) ◽  
pp. 1649-1664 ◽  
Author(s):  
H. Korkmaz Alpoguz ◽  
Shahabuddin Memon ◽  
Mustafa Ersoz ◽  
Mustafa Yilmaz
Keyword(s):  
Liquid Membrane ◽  
Bulk Liquid ◽  
Bulk Liquid Membrane ◽  
Kinetics Of
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