Amorphous nanosized Al–Ti–Mn trimetal hydrous oxides: synthesis, characterization and enhanced performance in arsenic removal

RSC Advances ◽  
2016 ◽  
Vol 6 (103) ◽  
pp. 100732-100742 ◽  
Author(s):  
Dong Nguyen Thanh ◽  
Zdeněk Bastl ◽  
Karla Černá ◽  
Pavel Ulbrich ◽  
Jaromír Lederer
Keyword(s):  
Arsenic Removal ◽  
Arsenite Oxidation ◽  
Hydrous Oxides ◽  
Arsenate Adsorption

Arsenite oxidation and arsenate adsorption on surface of amorphous nanosized Al–Ti–Mn trimetal hydrous oxides.

scholarly journals The Influence of Dosing Modes of Coagulate on Arsenic Removal

2014 ◽  
Vol 2014 ◽  
pp. 1-7
Author(s):  
Zhibin Zhang ◽  
Jinxiang Li ◽  
Cuizhen Sun ◽  
Yanhao Zhang ◽  
Lilong Huang ◽  
...  
Keyword(s):  
Particle Size ◽  
Arsenic Removal ◽  
Arsenic Speciation ◽  
Contaminated Water ◽  
Distribution Analysis ◽  
Hydrous Oxides ◽  
Stretching Vibration ◽  
Ft Ir ◽  
Single Dosing ◽  
High Arsenic

Three different dosing modes, including one single dosing mode and two sequential dosing modes, were applied in high-arsenic contaminated water treatment. The results illustrated that the As (V) soluble and the As (V) nonspecifically sorbed were the insignificant species from Fe-As (V) samples in the sequential dosing mode, while they were higher in the single dosing mode. However, it could be further concluded that the mobility of the Fe-As (V) in sequential dosing mode was greater than that in single dosing mode. Besides, the main arsenic speciation governing the arsenic-borne coagulates was the As (V) associated with poorly crystalline hydrous oxides of Fe in sequential or single dosing mode. Moreover, the particle size distribution analysis indicated that the sequential dosing mode was more prevalent in neutralizing and adsorbing the As (V) compared with the single dosing mode. In the FT-IR spectra, the presence of arsenic was highlighted by a well resolved band at 825–829 cm−1. The positions of the As–O stretching vibration bands were shifted gradually as the dosing mode changed from the single to the sequential. This result could be related to the distribution of arsenic speciation in different dosing modes.

scholarly journals Arsenic removal properties by electrolyzed and calcined manganese dioxide

2019 ◽  
Vol 25 (5) ◽  
pp. 735-741
Author(s):  
Yong-Jun Jung ◽  
Yuki Kamimoto
Keyword(s):  
Water Treatment ◽  
Adsorption Capacity ◽  
Adsorption Isotherms ◽  
Arsenic Removal ◽  
Equilibrium Concentration ◽  
Feed Solution ◽  
Ceramic Particle ◽  
Treatment Processes ◽  
Freundlich Equation ◽  
Arsenate Adsorption

As(V) removal properties of manganese dioxides which are commonly used for the removal of manganese in water treatment processes were evaluated in this paper. The following manganese dioxides were used: two types of powdered manganese dioxides powdered or electrolyzed MnO<sub>2</sub> (g-structure) and calcined MnO<sub>2</sub> (b-structure), and a granular MnO<sub>2</sub>, which was prepared by coating MnO<sub>2</sub> onto a ceramic particle. The maximum arsenate adsorption capacity of the electrolyzed and calcined MnO<sub>2</sub> was 2.22 and 2.26 mg-As g<sup>-1</sup>, respectively. The adsorption capacity of the granular MnO<sub>2</sub> was 0.543 mg-As g<sup>-1</sup> and this value corresponded to the MnO<sub>2</sub> content (23.2%) of the granular adsorbent. When an arsenate solution of 0.1 mg-As L<sup>-1</sup> was fed into the column (10 mm i.d.; 100 mm long) packed with the granular MnO<sub>2</sub> at SV = 20 h<sup>-1</sup>, the column received 28.9 L of the feed solution (3,580 times the bed volume) before the breakthrough point (0.01 mg-As L<sup>-1</sup>). The adsorption isotherms for the electrolyzed and granular MnO<sub>2</sub> were approximated by the modified Langmuir equations. On the other hand, the adsorption isotherm for the calcined MnO<sub>2</sub> was approximated by the Freundlich equation. Based on the adsorption isotherms, the As(V) adsorption amounts at 0.01 mg-As L<sup>-1</sup> of the equilibrium concentration were evaluated as follows: 1.27 mg-As g<sup>-1</sup> for the electrolyzed MnO<sub>2</sub>, 1.20 mg-As g<sup>-1</sup> for the calcined one, and 0.29 mg-As g<sup>-1</sup> for the granular one. Since granular MnO<sub>2</sub> has been commonly used for the removal of manganese from water treatment systems, the process can be also applied to arsenate removal.

Hydrous oxides and their cation-exchange properties

1965 ◽  
Vol 15 (10) ◽  
pp. 445-448 ◽  
Author(s):  
C. Heitner-Wirguin ◽  
A. Albu-Yaron
Keyword(s):  
Cation Exchange ◽  
Hydrous Oxides ◽  
Exchange Properties

IRON OXIDES FROM ELECTROFILTER ASH FOR WATER TREATMENT (ARSENIC REMOVAL)

2009 ◽  
Vol 8 (4) ◽  
pp. 895-900 ◽  
Author(s):  
Ionel Balcu ◽  
Adina Segneanu ◽  
Marius Mirica ◽  
Mirela Iorga ◽  
Catalin Badea ◽  
...  
Keyword(s):  
Water Treatment ◽  
Iron Oxides ◽  
Arsenic Removal

As(III) Removal by Dynamic Adsorption onto Amberlite XAD7 Functionalized with Crown Ether and Doped with Fe(III) Ions

2019 ◽  
Vol 70 (7) ◽  
pp. 2330-2334
Author(s):  
Mihaela Ciopec ◽  
Adina Negrea ◽  
Narcis Duteanu ◽  
Corneliu Mircea Davidescu ◽  
Iosif Hulka ◽  
...  
Keyword(s):  
Adsorption Process ◽  
Arsenic Removal ◽  
Arsenic Concentration ◽  
Fixed Bed ◽  
World Health ◽  
Arsenic Content ◽  
Arsenic Adsorption ◽  
Stage Of Development ◽  
Wide Range ◽  
Health Organization

Arsenic content in groundwater�s present a wide range of concentration, ranging from hundreds of micrograms to thousands of micrograms of arsenic per litter, while the maximum permitted arsenic concentration established by World Health Organization (WHO) is 10 mg L-1. According to the WHO all people, regardless of their stage of development and their social economic condition, have the right to have access to adequate drinking water. The most efficient and economic technique used for arsenic removal is represented by adsorption. In order to make this remediation technique more affordable and environmentally friendly is important to new materials with advance adsorbent properties. Novelty of present paper is represented by the usage of a new adsorbent material obtained by physical - chemical modification of Amberlite XAD polymers using crown ethers followed by iron doping, due to well-known affinity of arsenic for iron ions. Present paper aims to test the obtained modified Amberlite polymer for arsenic removal from real groundwater by using adsorption in a fixed bed column, establishing in this way a mechanism for the adsorption process. During experimental work was studied the influence of competing ions from real water into the arsenic adsorption process.

Arsenic removal by MF membrane with chemical sludge adsorption and NF membrane equipped with vibratory shear enhanced process

2003 ◽  
Vol 3 (5-6) ◽  
pp. 303-310 ◽  
Author(s):  
S.-H. Yi ◽  
S. Ahmed ◽  
Y. Watanabe ◽  
K. Watari
Keyword(s):  
Arsenic Removal ◽  
Membrane Surface ◽  
Membrane Process ◽  
Low Concentrations ◽  
Strong Shear ◽  
Low Levels ◽  
Removal Processes ◽  
Removal Of Arsenic ◽  
Concentration Polarization Layer ◽  
Chemical Sludge

Conventional arsenic removal processes have difficulty removing low concentrations of arsenic ion from water. Therefore, it is very hard to comply with stringent low levels of arsenic, such as below 10 μg/L. So, we have developed two arsenic removal processes which are able to comply with more stringent arsenic regulations. They are the MF membrane process combined with chemical sludge adsorption and NF membrane process equipped with the vibratory shear enhanced process (VSEP). In this paper, we examine the performance of these new processes for the removal of arsenic ion of a low concentration from water. We found that chemical sludge produced in the conventional rapid sand filtration plants can effectively remove As (V) ions of H2AsO4- and HAsO42- through anion exchange reaction. The removal efficiency of MF membrane process combined with chemical sludge adsorption increased to about 36%, compared to MF membrane alone. The strong shear force on the NF membrane surface produced by vibration on the VSEP causes the concentration polarization layer to thin through increased back transport velocity of particles. So, it can remove even dissolved constituents effectively. Therefore, As (V) ions such as H2AsO4- and HAsO42- can be removed. The concentration of As (V) ions decreased from 50 μg/L to below 10 μg/L and condensation factor in recirculating water increased up to 7 times by using NF membrane equipped with VSEP.

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