scholarly journals Humic Acid Removal by Electrocoagulation Process from Natural Aqueous Environments

2018 ◽  
pp. 3136-3146 ◽  
Author(s):  
Hadi Rezaei ◽  
Keyword(s):  
Humic Acid ◽  
Aqueous Environments ◽  
Electrocoagulation Process

A COMPARISON BETWEEN ALUMINIUM AND IRON ELECTRODES IN ELECTROCOAGULATION PROCESS FOR GLYPHOSATE REMOVAL

2015 ◽  
Vol 77 (32) ◽  
Author(s):  
Rabiatuladawiyah Danial ◽  
Luqman Chuah Abdullah ◽  
Mohsen Nourouzi Mobarekeh ◽  
Shafreeza Sobri ◽  
Nordayana Mohd Adnan
Keyword(s):  
Charged Particles ◽  
Deionized Water ◽  
Water Production ◽  
Batch Mode ◽  
Initial Concentration ◽  
Iron Electrodes ◽  
Metal Plates ◽  
Aqueous Environments ◽  
Electrocoagulation Process ◽  
Set Up

This study was intended to compare the performance of electrocoagulation process using aluminium and iron electrodes for glyphosate removal in aqueous solution. The effects of initial glyphosate concentration, electrocoagulation time and distance between electrodes, were discussed in detail. An electrocoagulation tank of 500mL with two metal plates electrodes, same in dimensions and metal types, was set up to perform batch mode laboratory experiment and the glyphosate in white powder was first diluted with deionized water. Production of metal cations showed an ability to neutralize negatively charged particles, which then encouraged to bind together to form aggregates of flocs composed of a combination of glyphosate and metal hydroxide. Compared with iron electrodes, aluminium electrodes were more effective for glyphosate removal, with a removal efficiency of over than 80%. This study revealed that electrocoagulation process using aluminium electrodes is reliable, especially designed for initial concentration 100 mg/L, electrocoagulation time 50 min, and distance between electrodes 6 cm. Finally, it can be concluded that electrocoagulation process using aluminium electrodes is efficient for glyphosate removal from aqueous environments.

scholarly journals Adsorption behaviour of hydrogarnet for humic acid

2018 ◽  
Vol 5 (4) ◽  
pp. 172023 ◽  
Author(s):  
Hirotaka Maeda ◽  
Yuichi Kurosaki ◽  
Masanobu Nakayama ◽  
Emile Hideki Ishida ◽  
Toshihiro Kasuga
Keyword(s):  
Humic Acid ◽  
Chemical Composition ◽  
Binding Energy ◽  
Adsorption Properties ◽  
Binding Energies ◽  
Chemical Compositions ◽  
Hydroxyl Groups ◽  
Adsorption Behaviour ◽  
Aqueous Environments ◽  
Single Chemical

Discharge of humic acid (HA) in aqueous environments is a key health and aesthetic issue. The present work investigates the use of hydrogarnet as a novel adsorbent for HA. Hydrogarnet was hydrothermally synthesized with different solvents to control the chemical composition. Hydrogarnet with three types of chemical compositions had better adsorption properties for HA than hydrogarnet with a single chemical composition. Controlling the chemical composition of hydrogarnet increased the number of hydroxyl groups and the overall binding energy of the system, leading to changes in the zeta potential. The enhancement of these adsorption properties is related to the increased numbers of hydroxyl groups on the surface and their diverse binding energies.

Aggregation and Dissolution of 4 nm ZnO Nanoparticles in Aqueous Environments: Influence of pH, Ionic Strength, Size, and Adsorption of Humic Acid

Langmuir ◽  
2011 ◽  
Vol 27 (10) ◽  
pp. 6059-6068 ◽  
Author(s):  
Shao-Wei Bian ◽  
Imali A. Mudunkotuwa ◽  
Thilini Rupasinghe ◽  
Vicki H. Grassian
Keyword(s):  
Humic Acid ◽  
Ionic Strength ◽  
Zno Nanoparticles ◽  
Aqueous Environments ◽  
Influence Of Ph

Behavior of ZnO Nanoparticles in Aqueous Environments: Influence of pH and Adsorption of Humic Acid

2013 ◽  
Vol 832 ◽  
pp. 728-733 ◽  
Author(s):  
Mohd Omar Fatehah ◽  
Hamidi Abdul Aziz ◽  
Serge Stoll
Keyword(s):  
Humic Acid ◽  
Zno Nanoparticles ◽  
Metal Oxide Nanoparticles ◽  
Aggregate Size ◽  
Low Concentrations ◽  
Aqueous Environments ◽  
Anionic Charge ◽  
Aggregation And Disaggregation ◽  
Average Size ◽  
Influence Of Ph

The surface charge and average size of ZnO was studied with a function of pH and time. The interactions between ZnO and Suwannee River humic acid (SRHA) were further investigated under a range of environmentally relevant conditions with the pHPZC as a point of reference. The anionic charge carried by aquatic humic substances plays a major part in the aggregation and disaggregation of metal oxide nanoparticles. At low concentrations of SRHA (<0.05 mg="" l="" the="" positively="" charged="" zno="" aggregates="" were="" rapidly="" adsorbed="" below="" ph="" sub="">PZC. With similar SRHA concentrations, at pH=pHPZC, SRHA was able to control the suspension behavior of the ZnO and promoted partial disaggregation in small volumes. This was more distinguishable as SRHA form a surface coating on the nanoparticles and enhances stability via electrostatic stabilization mechanism which induces the disaggregation behavior in the ZnO nanoparticles and hence, decreases the aggregate size.

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