scholarly journals Approximate description of multi-solute adsorption rate in organic aqueous solution.

1981 ◽  
Vol 14 (1) ◽  
pp. 73-75 ◽  
Author(s):  
HIROYUKI KAGE ◽  
IKUYA HASHIZUME ◽  
MORIO OKAZAKI ◽  
RYOZO TOEI
Keyword(s):  
Aqueous Solution ◽  
Adsorption Rate ◽  
Approximate Description ◽  
Solute Adsorption

scholarly journals EFFECT OF DIATOMEAOUS EARTH TREATMENT USING HYDROGEN CHLORIDE AND SULFURIC ACID ON KINETICS OF CADMIUM(II) ADSORPTION

2010 ◽  
Vol 2 (2) ◽  
pp. 107-112
Author(s):  
Nuryono Nuryono ◽  
Narsito Narsito
Keyword(s):  
Aqueous Solution ◽  
Sulfuric Acid ◽  
Hydrogen Chloride ◽  
Rate Constant ◽  
Diatomaceous Earth ◽  
Adsorption Rate ◽  
Physical Interaction ◽  
First Order ◽  
Adsorption Rate Constant ◽  
Kinetics Of

In this research, treatment of diatomaceous earth, Sangiran, Central Java using hydrogen chloride (HCl) and sulfuric acid (H2SO4) on kinetics of Cd(II) adsorption in aqueous solution has been carried out. The work was conducted by mixing an amount of grounded diatomaceous earth (200 mesh in size) with HCl or H2SO4 solution in various concentrations for two hours at temperature range of 100 - 150oC. The mixture was then filtered and washed with water until the filtrate pH is approximately 7 and then the residue was dried for four hours at a temperature of 70oC. The product was used as an adsorbent to adsorb Cd(II) in aqueous solution with various concentrations. The Cd(II) adsorbed was determined by analyzing the rest of Cd(II) in the solution using atomic absorption spectrophotometry. The effect of treatment was evaluated from kinetic parameter of adsorption rate constant calculated based on the simple kinetic model. Results showed  that before equilibrium condition reached, adsorpstion of Cd(II) occurred through two steps, i.e. a step tends to follow a reaction of irreversible first order  (step I) followed by reaction of reversible first order (step II). Treatment with acids, either hydrogen chloride or sulfuric acid, decreased adsorption rate constant for the step I from 15.2/min to a range of 6.4 - 9.4/min.  However, increasing concentration of acid (in a range of concentration investigated) did not give significant and constant change of adsorption rate constant. For step II process,  adsorption involved physical interaction with the sufficient low adsorption energy (in a range of 311.3 - 1001 J/mol).     Keywords: adsorption, cdmium, diatomaceous earth, kinetics.

Photocatalytic oxidation of chlorophenols in the presence of manganese ions

1999 ◽  
Vol 39 (10-11) ◽  
pp. 225-230 ◽  
Author(s):  
Jong-Nan Chen ◽  
Yi-Chin Chan ◽  
Ming-Chun Lu
Keyword(s):  
Aqueous Solution ◽  
Ionic Strength ◽  
Photocatalytic Oxidation ◽  
Reaction Rate ◽  
Removal Rate ◽  
Adsorption Rate ◽  
Manganese Ions ◽  
Manganese Ion ◽  
Cp Decomposition ◽  
The Relationship

The decomposition of chlorophenols in aqueous solution with UV-illuminated TiO2 suspensions in the presence of manganese ions was studied. It was found that the removal rate of chlorophenols would be the highest at pH 3 in the presence of 1.18×10−4 M manganese ion. The effect of ionic strength on the 2-CP decomposition can be ignored in the range from 0.1 to 0.005 M for NaClO4. This study is also to explore the relationship between the adsorption rate and reaction rate. Results showed that the more the adsorption rate the more the decomposition rate for the three chlorophenols. Manganese ions can increase the photocatalytic oxidation of 2-chlorophenol in terms of DOC. The relationship between temperature and reaction rate for 2-CP is k = 0.0043T - 1.2146.

Adsorption rate of phenol from aqueous solution onto organobentonite: Surface diffusion and kinetic models

2011 ◽  
Vol 364 (1) ◽  
pp. 195-204 ◽  
Author(s):  
Raul Ocampo-Perez ◽  
Roberto Leyva-Ramos ◽  
Jovita Mendoza-Barron ◽  
Rosa M. Guerrero-Coronado
Keyword(s):  
Aqueous Solution ◽  
Surface Diffusion ◽  
Kinetic Models ◽  
Adsorption Rate

scholarly journals CRUSTACEAN WASTE SHELLS AS ADSORPTION MATERIALS FOR HEAVY METALS IN AN AQUEOUS SOLUTION

2020 ◽  
Vol 4 (2) ◽  
pp. 33-25
Author(s):  
Queency P. Padida ◽  
Rolando V. Maningas ◽  
Christian Paul P. dela Cruz ◽  
Lustina P. Lapie ◽  
Nilda S. Alforja
Keyword(s):  
Heavy Metals ◽  
Aqueous Solution ◽  
Contact Time ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
High Capacity ◽  
Adsorption Rate ◽  
Agriculture Industry ◽  
Laguna De Bay ◽  
High Concentrations

Laguna de Bay is one of the country’s major lakes, providing a third of the fish consumed by Metro Manila’s 16 million residents. It also provides support for agriculture, industry, and hydropower generation, as well as providing a welcome respite for many Filipinos. However, because of the lake’s importance, it is threatened by a variety of issues, including pollution. Heavy metals such as mercury and lead are present in high concentrations in the lake. And these heavy metals may persist in fish, water, air and the human body. As a result, an adsorption technique for heavy metal removal in an aqueous solution was investigated. As an adsorbent, the produced chitosan from crustacean waste shells was employed. The study’s parameters were contact time, adsorbent quantity, and pH. Results showed that 0.5 g of chitosan has a higher absorption rate of 99% in 500 mg/L solutions compared to 1.0 g of chitosan with an adsorption rate of 98%. In terms of contact time, 60 minutes showed almost 100% adsorption rate while 120 minutes was 98%. With increasing pH, the amount of metal adsorption rises. This developed chitosan from crustacean waste shells indicates high capacity as adsorbent materials for heavy metals. As a result, it appears to be a viable material for water treatment.

scholarly journals Effect of the coexistence of SO32− and PO43− on the adsorption performance of zeolite-loaded FeOOH@ZnO for S2−

2021 ◽  
Author(s):  
Fen Li ◽  
Youjing Li ◽  
Baocai Ge ◽  
Jinguang Hu ◽  
Cailian Yu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Hydrothermal Method ◽  
Significant Influence ◽  
Removal Rate ◽  
Adsorption Properties ◽  
Adsorption Rate ◽  
Modified Zeolite ◽  
Adsorption Performance ◽  
Modified Zeolites

Abstract The present study deals with the synthesis of zeolite-loaded FeOOH@ZnO by hydrothermal method and investigates the effects of coexisting SO32− and PO43− ions in the aqueous solution on the adsorption performance for S2−. The results showed that the HNO3-modified zeolite loaded with FeOOH@ZnO (FeOOH@ZnO/HZ) resulted in a maximum S2− removal rate of ≈98%. The adsorbent's performance on removing S2− was significantly enhanced, compared with NaOH and ZnCl2-modified zeolites loaded with FeOOH@ZnO, and the adsorption was proved to be a heat-absorbing process. When SO32− and PO43− coexisted with S2−, SO32− and PO43− had a significant influence on the adsorption properties of FeOOH@ZnO/HZ. When three ions of S2−, SO32− and PO43− were present simultaneously, the adsorption performance of FeOOH@ZnO/HZ on S2− was further, and the removal rate dropped to about 80%. Moreover, FeOOH@ZnO/HZ also adsorbed PO43− and SO32− in the system containing multiple ions, but the adsorption rate of PO43− and SO32− were much lower than S2−. This indicated that the adsorption of S2− in the presence of FeOOH@ZnO/HZ dominates under competitive conditions.

Adsorption of Cationic Dyes from Aqueous Solution onto Rapeseed Meal

2012 ◽  
Vol 550-553 ◽  
pp. 1550-1555
Author(s):  
Guo Lan Li ◽  
Song Li ◽  
Deng Liang He ◽  
Jun Liang Du
Keyword(s):  
Aqueous Solution ◽  
Adsorption Process ◽  
Low Cost ◽  
Agricultural Waste ◽  
Industrial Effluent ◽  
Rapeseed Meal ◽  
Adsorption Rate ◽  
Cationic Dyes ◽  
Pseudo Second Order ◽  
Isotherm Equations

Using an agricultural waste rapeseed meal (RM) as adsorbent, the adsorption of methylene blue (MB) and malachite green (MG) from aqueous solution has been studied. For this purpose, the adsorption of MB and MG onto the RM with aspects of kinetics, equilibrium and the effect of pH were investigated. The equilibrium experimental data of MB and MG is in well accordance with isotherm equations of Langmuir and Freundlich. And the maximum uptake capacities (qm) of MB and MG were 122 and 78 mg.g-1respectively. It was observed that the adsorption rate of MB and MG onto the RM were very rapid and the adsorption process followed the pseudo-second-order equation. The RM appears as a very prospective adsorbent for the removal of cationic dyes from industrial effluent due to its high uptake, rapid adsorption rate and low cost.

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