Removal of copper and nickel from water using nanocomposite of magnetic hydroxyapatite nanorods

An Fe-impregnated hierarchal web of carbon fibers was synthesized and evaluated as an adsorbent for arsenic(V) removal from wastewater. The web was prepared by growing carbon nanofibers (CNFs) on t...

Fe-Grown Carbon Nanofibers for Removal of Arsenic(V) in Wastewater

Formation of tooeleite and the role of direct removal of As(III) from high-arsenic acid wastewater.

Comparison of treated laterite as arsenic adsorbent from different locations and performance of best filter under field conditions.


 The novelty of the current study deals with the application of magnetic nanosorbent, chitosan-coated magnetic nanoparticles (cMNPs), to be utilized for the management of lignocellulosic bio-refinery wastewater (LBW) containing three heavy metals and 26 phenolic compounds. The magnetic property of the adsorbent, confirmed by elemental and vibrating sample magnetometer analysis (saturation magnetization of 26.96 emu/g), allows easy separation of the particles in the presence of an external magnetic field. At pH 6.0, with optimized adsorbent dosage of 2.0 g/L and 90 min contact time, maximum removal of phenol (46.2%), copper (42.2%), chromium (18.7%) and arsenic (2.44%) was observed. The extent of removal of phenolic compounds was in the order: polysubstituted > di-substituted > mono-substituted > cresol > phenol. Overall, the adsorption capacity (qe) of cMNPs varies among the different contaminants in the following manner: copper (1.03 mg/g), chromium (0.20 mg/g), arsenic (0.04 mg/g) and phenol (0.56 mg/g). Post-adsorption, retrieving the cMNPs using an external magnetic field followed by single-step desorption via acid–base treatment is attractive for implementation in industrial settings. Reusability of the adsorbent was studied by recycling the cMNPs for five consecutive rounds of adsorption followed by desorption, at the end of which, cMNPs retained 20% of their initial adsorption capacity.

Remediation of bio-refinery wastewater containing organic and inorganic toxic pollutants by adsorption onto chitosan-based magnetic nanosorbent

This study focused on the removal of arsenic from simulated groundwater by batch adsorption using iron-modified rice husk carbon (RH-Fe). The results showed that RH-Fe was very effective in the removal of arsenic not only at low and moderate initial concentrations of arsenic (1.42 and 2.77 mg/L) but also at very high initial concentrations of arsenic (4.61 and 7.38 mg/L). The arsenic adsorption by RH-Fe was dependent on pH and varied with arsenic initial concentration and adsorbent dose. Langmuir isotherm could describe the adsorption equilibrium and the adsorption capacity was found to be 2.24mg/g. The pseudo-second order kinetic model gave the best fit with the experimental data.

https://www.jstage.jst.go.jp/article/jwet/7/2/7_2_43/_pdf

Removal of arsenic from simulated groundwater by adsorption using iron-modified rice husk carbon

Groundwater is one of the most important sources for drinking water. Arsenic (As) contamination of groundwater is a serious problem worldwide, especially in Bangladesh, India and South East Asia. Adsorption using appropriate and readily available adsorbents is a promising method for the removal of arsenic with applicability in rural areas. This work aims to study the removal of arsenic from synthetic groundwater using an adsorption column by sequential combination of laterite (LA) and iron-modified activated carbon (AC-Fe) as adsorbents. The effect of ratio LA/AC-Fe, flow rate, initial arsenic concentration and pH to the breakthrough time were investigated. Adsorption equilibrium and adsorption kinetics were also studied through batch experiment. The result was found to be an efficient and feasible approach for arsenic treatment from groundwater for ready applicability in rural areas.

/pdf/removal-of-arsenic-from-synthetic-groundwater-by-adsorption-1tct0j2ft1.pdf

Removal of arsenic from synthetic groundwater by adsorption using the combination of laterite and iron-modified activated carbon

This work aims to investigate the removal of arsenic from the simulated groundwater by batch adsorption using Iron (ZVI) and Iron[III] Oxide (IO). The effect of initial arsenic concentration, adsorbent dose and pH were investigated. Adsorption equilibrium and its kinetics were also studied. The results showed that both ZVI and IO have a high efficiency for adsorption of arsenic from groundwater. Langmuir isotherm described well the adsorption equilibrium and the pseudo-second order kinetic model gave the best fit with the experimental kinetic data for both ZVI and IO.

/pdf/an-investigation-on-the-removal-of-arsenic-from-simulated-x99fdohr2i.pdf

Son Van Dang

Papers

Removal of arsenic from simulated groundwater by adsorption using iron-modified rice husk carbon

Removal of arsenic from synthetic groundwater by adsorption using the combination of laterite and iron-modified activated carbon

An investigation on the removal of arsenic from simulated groundwater by adsorption using iron and iron oxide[iii]