removal arsenic efficiency

In this study the efficiency of magnetic nanoparticles for removal of trivalent arsenic from synthetic industrial wastewater was evaluated. The nanoparticles was prepared by sol-gel method and ...

A R-MFC composite containing 41 wt% of ZnO nanocrystals was found to be very efficient to remove arsenic (As(V)) ions from water with the maximum capacity of 4,421 mg/g at neutral pH (= 7), based ...

Increasing initial pH led to decreasing the arsenic(V) removal efficiency. Also, the process efficiency increased with decreasing temperature, increasing sorbent dose and contact time. Kinetics study showed that the process is a pseudo-second-order reaction. Langmuir model best described the adsorption isotherm, with a maximum …

Bath experiments were carried out to explore the arsenic removal efficiency and reaction mechanism, using 5 g of steel-making slag and 100 mL of copper smelting wastewater, at different permanganate dosages (0, 1, 1.5, 2, and 2.5 mmol) and reaction times (30, 45, 60, 90, 120, 150, and 180 min). Under optimum conditions, a deep …

1. Introduction. Arsenic (As) is a naturally occurring element that can be introduced into water and soils through uncontrolled steel smelting, as well as the utilization of fertilizers and insecticide (Sun et al., 2008).As-contaminated water and soils are widespread worldwide, especially in Bangladesh, India, and China (Wang et al., 2016, …

Arsenic removal from water by electrocoagulation can use iron, aluminium, or titanium; each metal promotes different efficiency (Kumar et al., 2004). Aluminum …

Maximization of the coagulation process efficiency, thus, arsenic removal by optimization of the other operating conditions, such as chemical concentrations, operational pH, and initial arsenic concentration, therefore, is very important. For this aim, the Box–Behnken experimental design method was used to find optimum removal …

To obtain the best arsenic removal efficiency and reduce experiment costs, 360 min was chosen as the best washing time to carry out subsequent experiments. 3.2.3. pH. The removal of arsenic and iron was studied at different pH values (3.0–10.0) with the composite washing agent. The results showed that the removal of arsenic and iron from ...

In this study, the removal of arsenic using two membrane processes-nanofiltration (NF) and reverse osmosis (RO) has been specially investigated in light of the outstanding removal efficiency of ...

Figure 2.2 indicates that the arsenic removal efficiency in the absence of chlorine increases steeply from 15% to 80% as the pH changes from 9 to 11 when the arsenic concentration of the contaminated water is 400 μg/L. Arsenic removal efficiency for the same feed varies almost linearly (from 30% to 95%) with pH in the range of 8–11 in the …

Effects of adsorption time on removal efficiency. The effects of adsorption time on TiO 2-impregnated mineral activated carbon's arsenic removal efficiency in the water polluted by DA were firstly studied.As shown in Fig. 2, the removal efficiencies of total arsenic increased with the extension of adsorption time, suggesting that the TiO 2 …

1. Introduction. Arsenic (As) contamination in groundwater has been an environmental issue for many decades (Nordstrom, 2002).Excessive and prolonged exposure to As can cause serious health problems such as skin lesions and cancers (Brown and Ross, 2002).Even now, millions of people face the threat of As, particularly in …

This book chapter presents a systematic description of current status of research in the area of arsenic removal from contaminated water and comparison of all technologies available with more emphasis on adsorption. ... X. Hu, et al., Characterization and adsorption performance of Zr-doped akaganéite for efficient arsenic removal J. …

The efficiency of arsenic oxidation by platinum anodes with a solution of SO 4 2-has been studied. The oxidation rate is high because SO 4 2-is resistant to oxidation and advanced electrochemical oxidation processes to oxidize arsenic-contaminated water, where dimensionally fixed electrodes such as platinum-coated titanium (Pt/Ti) are used …

The arsenic removal efficiency by Fe-Bir/PEI reaches to 93% at pH 3, as the abundant H + ions promote the adsorption of arsenic anions by Fe-Bir/PEI. When the pH is greater than 9, the competitive effect of OH − ions leads to a decreased arsenic removal efficiency [30] .

The catalytic efficiency of the synthesised MnL for As(III) removal was firstly evaluated under neutral conditions (Fig. 2 a).In the treatment group without the addition of MnL, only 5% of As(III) was oxidised at the end of the study, which indicated the low capability of As oxidation by H 2 O 2 under neutral conditions (Shan et al., 2019b).It …

Introduction. Soils are frequently contaminated with arsenic (As) due to geological processes and human activities (Sharma et al., 2022).Elevated levels of As in soils are detrimental to plant growth and pose significant health risks to humans through the food chain (Li et al., 2011).Consequently, As pollution in soils has gained considerable …

The removal efficiency of the adsorbent improves with an increase in the dosage of adsorbent as the number of free sites for metal cations increases [42, 43]. Ion exchange, surface protonation, electrostatic attraction and chemical interaction can be used to explain how a pH shift affects the efficiency of arsenic adsorption by treated laterite ...

Arsenic removal efficiency of different coagulants varies as a function of pH. Below pH 7.6, Al 2 (SO 4 ) 3, and FeCl 3 are equally effective in removing arsenic from water [ 41 ]. Between the two inorganic arsenic species, most researchers suggested …

Arsenic removal from groundwater of the Chaco-Pampean Plain (Argentina) using natural geological materials as adsorbents. Journal of Environmental Science and Health, Part A, 46 (11), 1297-1310.

For As(V) concentration up to 10 mg/L in the solution shows 98.85% rejection efficiency at low pH but efficiency decreases as arsenic concentration …

To standardize the data on effectiveness, the following formula was used to calculate the arsenic removal efficiency of each technology, where n is the arsenic removal efficiency, C₀ is the influent arsenic concentration of the water sample, and Ce is the effluent arsenic concentration. n(%)= (C₀-Ce) ×100 C₀ To compare costs, all non-USD ...

Accordingly, the arsenic removal efficiency increases from 73.76% to 98.98% when the reaction temperature increases from 60 °C to 90 °C. Both TCLP and XRD results show that the well-crystallized and environmentally stable scorodite is obtained at higher temperatures (≥70 °C), and the crystallite and stability increase with the increase …

The experimental results indicated that when the CFBC-PS system was acidic and neutral (pH 2–6), the efficiency of As(III) removal was remarkable (99.8%). In the …

A high arsenic removal efficiency of 99.90% was achieved, and the dissolution of magnetite slowed after 12 h. A reaction of 12 h was found to be sufficient for arsenic precipitation and scorodite formation. The FTIR gives the surface information for the precipitates obtained from the different reaction times, as shown in Fig. 1 d.

Published: 22 September 2022. A systematic study of arsenic adsorption and removal from aqueous environments using novel graphene oxide functionalized UiO-66-NDC …

The fourteen (14) technologies tested in the field achieved removal efficiency levels ranging between 60% and ~99%, with ten (10) attaining above 90% removal efficiency. Of these, only five (5) reached established the WHO standard. Some of the technologies under-performed when their influent water contained excessive …

For arsenic removal efficiency of the filtration device, USEPA advocates use of any input arsenic concentration of your choice based on local ground water contaminations level and reduce it to less than 10 ppb and claim the same conditions in the product (e.g. this product meets US EPA standard for arsenic with an input of say 200 …

However, the typical reported concentration of SiO 3 2− in groundwater is 0.3 mM (Das et al., 2020), so we expect some reduction in arsenic removal efficiency when CNCs–PDA–nZVI is used. In particular, PO 4 3− has a similar adsorption mechanism to arsenic due to its considerable chemical similarity (P.L. Smedley and Kinniburgh, 2002 ).

The present work aims to study the removal efficiency of As(V) from arsenic-polluted groundwater wells coming from Nazarabad in Iran through the coagulation-flocculation process with ferric chloride coagulant. The Nazarabad well as a source of highly arsenic-polluted groundwater with an initial As(V) concentration of 0.5 mg/L was chosen …

Arsenic removal studies were carried out on different MOFs such as Fe-BTC MOF, MIL-53, and ZIF-8. ... After five cycles, their removal efficiency was only about 52.24% of what it was at the start, ...