Preparation of Fe-SBC from Urban Sludge for Organic and Inorganic Arsenic Removal

2019 ◽  
Vol 19 (5) ◽  
pp. 2658-2663 ◽  
Author(s):  
Min-Fa Lin ◽  
Nhat-Thien Nguyen ◽  
Chang-Tang Chang ◽  
Po-Han Chen
Keyword(s):  
Arsenic Removal ◽  
Inorganic Arsenic

scholarly journals The sorption of inorganic arsenic on modified sepiolite: Effect of hydrated iron(III)-oxide

2014 ◽  
Vol 79 (7) ◽  
pp. 815-828 ◽  
Author(s):  
Nikola Ilic ◽  
Slavica Lazarevic ◽  
Vladana Rajakovic-Ognjanovic ◽  
Ljubinka Rajakovic ◽  
Djordje Janackovic ◽  
...  
Keyword(s):  
Sorption Capacity ◽  
Arsenic Removal ◽  
Ph Value ◽  
Inorganic Arsenic ◽  
Arsenic Species ◽  
Deionized Water ◽  
Order Kinetic ◽  
Initial Ph ◽  
Order Kinetic Model ◽  
Pseudo Second Order

The sorption of inorganic arsenic species, As(III) and As(V), from water by sepiolite modified with hydrated iron(III) oxide was investigated at 25 ?C through batch studies. The influence of the initial pH value, the initial As concentrations, the contact time and types of water on the sorption capacity was investigated. Two types of water were used, deionized and groundwater. The maximal sorption capacity for As(III) from deionized water was observed at initial and final pH value 7.0, while the bonding of As(V) was observed to be almost pH independent for pH value in the range from 2.0 to 7.0, and the significant decrease in the sorption capacity was observed at pH values above 7.0. The sorption capacity at initial pH 7.0 was about 10 mg g?1 for As(III) and 4.2 mg g?1 for As(V) in deionized water. The capacity in groundwater was decreased by 40 % for As(III) and by 20 % for As(V). The Langmuir model and pseudo-second order kinetic model revealed good agreement with the experimental results. The results show that Fe(III)-modified sepiolite exhibits significant affinity for arsenic removal and it has a potential for the application in water purification processes.

Arsenic Speciation: Reduction of Arsenic(V) to Arsenic(III) by Fulvic Acid

2006 ◽  
Vol 3 (2) ◽  
pp. 137 ◽  
Author(s):  
Tsanangurayi Tongesayi ◽  
Ronald B. Smart
Keyword(s):  
Fulvic Acid ◽  
Arsenic Removal ◽  
Research Effort ◽  
Arsenic Speciation ◽  
Inorganic Arsenic ◽  
Stripping Voltammetry ◽  
Reduction Reaction ◽  
Cathodic Stripping Voltammetry ◽  
Suwannee River Fulvic Acid ◽  
Removal Technologies

Environmental Context.Most technologies for arsenic removal from water are based on the oxidation of the more toxic and more mobile arsenic(iii) to the less toxic and less mobile arsenic(v). As a result, research effort has been focussed on the oxidation of arsenic(iii) to arsenic(v). It is equally important to explore environmental factors that enhance the reduction of arsenic(v) to arsenic(iii). An understanding of the redox cycling of arsenic could result in the development of cheaper and more efficient arsenic removal technologies, especially for impoverished communities severely threatened by arsenic contamination. Abstract.The objective of this study was to investigate the reduction of inorganic arsenic(v) with Suwannee River fulvic acid (FA) in aqueous solutions where pH, [FA], [As(v)], [As(iii)], and [Fe(iii)] were independently varied. Samples of inorganic As(v) were incubated with FA in both light and dark at constant temperature. Sterilisation techniques were employed to ensure abiotic conditions. Aliquots from the incubated samples were taken at various time intervals and analysed for As(iii) using square-wave cathodic-stripping voltammetry at a hanging mercury drop electrode. The study demonstrated the following important aspects of As speciation: (1) FA can significantly reduce As(v) to As(iii); (2) reduction of As(v) to As(iii) is a function of time; (3) both dark and light conditions promote reduction of As(v) to As(iii); (4) Fe(iii) speeds up the reduction reaction; and (5) oxidation of As(iii) to As(v) is promoted at pH 2 more than at pH 6.

scholarly journals Nanofiltration for Arsenic Removal: Challenges, Recent Developments, and Perspectives

Nanomaterials ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 1323 ◽  
Author(s):  
TA Siddique ◽  
Naba K. Dutta ◽  
Namita Roy Choudhury
Keyword(s):  
Drinking Water ◽  
Arsenic Removal ◽  
Environmental Concern ◽  
Low Cost ◽  
Inorganic Arsenic ◽  
Water Security ◽  
Polymer Nanocomposite ◽  
Life Forms ◽  
Current Status ◽  
The Status

Arsenic (As) removal is of major significance because inorganic arsenic is highly toxic to all life forms, is a confirmed carcinogen, and is of significant environmental concern. As contamination in drinking water alone threatens more than 150 million people all over the world. Therefore, several conventional methods such as oxidation, coagulation, adsorption, etc., have been implemented for As removal, but due to their cost-maintenance limitations; there is a drive for advanced, low cost nanofiltration membrane-based technology. Thus, in order to address the increasing demand of fresh and drinking water, this review focuses on advanced nanofiltration (NF) strategy for As removal to safeguard water security. The review concentrates on different types of NF membranes, membrane fabrication processes, and their mechanism and efficiency of performance for removing As from contaminated water. The article provides an overview of the current status of polymer-, polymer composite-, and polymer nanocomposite-based NF membranes, to assess the status of nanomaterial-facilitated NF membranes and to incite progress in this area. Finally, future perspectives and future trends are highlighted.

Inorganic Arsenic Removal by Zero-Valent Iron

2000 ◽  
Vol 17 (1) ◽  
pp. 29-39 ◽  
Author(s):  
JEFFREY A. LACKOVIC ◽  
NIKOLAOS P. NIKOLAIDIS ◽  
GREGORY M. DOBBS
Keyword(s):  
Arsenic Removal ◽  
Inorganic Arsenic ◽  
Zero Valent Iron

Specifically Designed Amine Functional Group Doped Sludge Biochar for Inorganic and Organic Arsenic Removal

2020 ◽  
Author(s):  
Chih-Kuei Chen ◽  
Nhat-Thien Nguyen ◽  
Thuy-Trang Le ◽  
Cong-Chinh Duong ◽  
Thi-Thanh Duong
Keyword(s):  
Surface Area ◽  
Photoelectron Spectroscopy ◽  
Density Functional ◽  
Arsenic Removal ◽  
Physical Adsorption ◽  
Inorganic Arsenic ◽  
Chemical Adsorption ◽  
Arsenic Adsorption ◽  
Organic Arsenic ◽  
Adsorption Energies

Abstract Usages of hospital sludge as a biochar adsorbent for wastewater treatment plants were investigated. Microwave carbonization was used to carbonize the sludge and then chemically activated with ZnCl 2 to increase surface area and porosity. A newly designed amine functional group’s (DETA) doped sludge biochar carbon (SBC) presents effective inorganic arsenic (As(III), As 2 O 3 ) and organic arsenic (p-ASA, C 2 H 7 AsO 2 ) adsorption in water. The pore volume, pore size distribution and specific surface area were determined by performing nitrogen adsorption-desorption measurements (BET). The Fourier transform infrared (FTIR) of the SBC was recorded to study the functional groups at room temperature. The composition of SBC was further determined by X-ray photoelectron spectroscopy (XPS). In order to understand the effect of amine functional complexes on arsenic adsorption, the adsorption mechanism of As 2 O 3 and p-ASA on SBC surfaces modified with amine functional complexes was studied using density functional theory (DFT). Results showed that both physical and chemical adsorption of As 2 O 3 and p-ASA on SBC surfaces occurred. The participation of amine functional complexes greatly promoted the surface activity of SBC surface and its adsorption capacity on arsenic. The physical adsorption energies of As 2 O 3 and p-ASA on SBC surface with amine functional complexes were -38.4 and -32.8 KJ mol -1 , respectively. Other hand, the chemical adsorption energies of As 2 O 3 and p-ASA on SBC surface with amine functional complexes were -92.9 KJ mol -1 and -98.5 KJ mol -1 , respectively.

scholarly journals Inorganic arsenic removal in rice bran by percolating cooking water

2017 ◽  
Vol 234 ◽  
pp. 76-80 ◽  
Author(s):  
Antonio J. Signes-Pastor ◽  
Manus Carey ◽  
Andrew A. Meharg
Keyword(s):  
Rice Bran ◽  
Arsenic Removal ◽  
Inorganic Arsenic ◽  
Cooking Water

scholarly journals Synthetic Iowaite Can Effectively Remove Inorganic Arsenic from Marine Extract

Molecules ◽  
2021 ◽  
Vol 26 (10) ◽  
pp. 3052
Author(s):  
Jing Ji ◽  
Wenwen Huang ◽  
Lingchong Wang ◽  
Lu Chen ◽  
Yuanqing Wei ◽  
...  
Keyword(s):  
Arsenic Removal ◽  
Inorganic Arsenic ◽  
Order Kinetic ◽  
Marine Products ◽  
Organic Arsenic ◽  
Inclusion Morphology ◽  
Standard Solution ◽  
Marine Food ◽  
Adsorption Rates ◽  
Removal Of Arsenic

For the removal of arsenic from marine products, iowaite was prepared and investigated to determine the optimal adsorption process of arsenic. Different chemical forms of arsenic (As(III), As(V)) with varying concentrations (0.15, 1.5, 5, 10, 15, and 20 mg/L) under various conditions including pH (3, 5, 7, 9, 11) and contact time (1, 2, 5, 10, 15, 30, 60, 120, 180 min) were exposed to iowaite. Adsorption isotherms and metal ions kinetic modeling onto the adsorbent were determined based on Langmuir, Freundlich, first- and second-order kinetic models. The adsorption onto iowaite varied depending on the conditions. The adsorption rates of standard solution, As(III) and As(V) exceeded 95% under proper conditions, while high complexity was noted with marine samples. As(III) and As(V) from Mactra veneriformis extraction all decreased when exposed to iowaite. The inclusion morphology and interconversion of organic arsenic limit adsorption. Iowaite can be efficiently used for inorganic arsenic removal from wastewater and different marine food products, which maybe other adsorbent or further performance of iowaite needs to be investigated for organic arsenic.

Characterization of binary oxide photoactive material and its application for inorganic arsenic removal

2014 ◽  
Vol 20 (5) ◽  
pp. 3658-3662 ◽  
Author(s):  
D. Harikishore Kumar Reddy ◽  
Seung-Mok Lee ◽  
Jae-Kyu Yang ◽  
Youn-Jong Park
Keyword(s):  
Arsenic Removal ◽  
Inorganic Arsenic ◽  
Binary Oxide

Hijiki Seaweed (Hizikia fusiformis): Nutritional Value, Safety Concern and Arsenic Removal Method

2013 ◽  
Vol 634-638 ◽  
pp. 1247-1252 ◽  
Author(s):  
Tao Zheng ◽  
Cheng Chu Liu ◽  
Jing Ya Yang ◽  
Qi Gen Liu ◽  
Jia Le Li
Keyword(s):  
Arsenic Removal ◽  
Safety Concern ◽  
Inorganic Arsenic ◽  
Laminaria Japonica ◽  
Dry Weight ◽  
Human Consumption ◽  
Arsenic Content ◽  
Hizikia Fusiformis ◽  
Removal Method ◽  
Porphyra Tenera

This study reported the nutritional components and heavy metals of Hijiki seaweed (Hizikia fusiformis) and investigated the efficacy of aqueous extraction method to remove inorganic arsenic from Hijiki seaweed. Hijiki contained 12.2% of crude proteins, 1.8% of total lipids, 14.0% of ashes, 11.3% of total fiber with dry weight, respectively. The content of protein and ashes were slightly lower than other edible seaweeds including Laminaria japonica, Porphyra tenera, Undaria pinnatifida, Palmaria palmate, while the total fiber was much higher compared with those four seaweeds (6.7-7.8%), which showed more benefits to human health especially to intestines. However, Hijiki contained extremely high amount of heavy metal arsenic (total arsenic: 100mg/kg; inorganic arsenic: 44 mg/kg, dry weight), which might be a major safety concern for human consumption. We developed an aqueous removal method to remove inorganic arsenic from Hijiki. The majority of inorganic arsenic (95.9-96.6%) was removed at optimal condition (50°C, pH 4, 8-12h).The inorganic arsenic content of Hijiki ranged from 0.37 mg/kg to 0.46 mg/kg with wet weight after the treatment and met the hygienic standard for marine algae and algae products.

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