http://www.eng.uwo.ca/research/grc/pdfs/2011/Boparai_et_al_Kinetics.pdf

Kinetics and thermodynamics of cadmium ion removal by adsorption onto nano zerovalent iron particles.

Heavy metal removal from aqueous solution by advanced carbon nanotubes: Critical review of adsorption applications

Sorption of divalent metal ions from aqueous solution by carbon nanotubes: A review

Competitive adsorption of Pb2+, Cu2+ and Cd2+ ions from aqueous solutions by multiwalled carbon nanotubes

Adsorption of cadmium(II) from aqueous solution by surface oxidized carbon nanotubes

Crab shell for the removal of heavy metals from aqueous solution.

The electrocatalytic behavior and anodic performance of Sb-SnO2 and nickel-doped Sb-SnO2 (Ni-Sb-SnO2) in sodium sulfate and sodium chloride electrolytes were compared. Nickel-doping increased the service lifetime by a factor of 9 and decreased the charge transfer resistance of the Sb-SnO2 electrodes by 65%. More importantly, Ni doping improved the electrocatalytic performance of Sb-SnO2 for the remediation of aqueous phenol and the inactivation of E. coli by a factor of more than 600% and ∼20%, respectively. In the sulfate electrolyte, the primary reactive oxygen species (ROS) identified were OH radicals (Faradaic efficiency η = 2.4%) with trace levels of ozone and hydrogen peroxide (η < 0.01%) at Sb-SnO2. In contrast, the primary ROS at Ni-Sb-SnO2 was ozone (η = 9.3%) followed by OH radicals (η = 3.7%). In the chloride electrolyte, the production of hypochlorite (OCl(-)) was higher (η = 0.73%) than that of ozone (η = 0.13%) at Sb-SnO2, whereas the level of ozone (η = 13.6%) was much higher than that of hypochlorite (η = 0.24%) at Ni-Sb-SnO2. Based on the shift of the reactive species, the primary effect of Ni doping is to catalyze the six-electron oxidation of water to ozone and inhibit the competing one or two-electron oxidation of water (generation of OH radicals, hydrogen peroxides, and hypochlorites). A range of electrochemical and surface analyses were performed, and a detailed mechanism was proposed.

Shift of the reactive species in the Sb-SnO2-electrocatalyzed inactivation of e. coli and degradation of phenol: effects of nickel doping and electrolytes.

Laboratory scale experiments were conducted to study the deterioration of enhanced biological phosphorus removal (EBPR) due to influent ammonium concentration, and to compare the performance of two types of sequencing batch reactor (SBR) systems, a conventional SBR and sequencing batch biofilm reactor (SBBR). Both in SBR and SBBR, the total nitrogen removal efficiency decreased from 100% to 53% and from 87.5% to 54.4%, respectively, with the increase of influent ammonium concentration from 20 mg/l to 80 mg/l. When the influent ammonium concentration was as low as 20 mg/l (C: N: P=200: 20: 15), denitrifying glycogen-accumulating organisms (DGAOs) were successfully grown and activated by using glucose as a sole carbon source in a lab-scale anaerobic-oxic-anoxic (A2O) SBR. In the SBR, due to the effect of incomplete denitrification and pH drop, the nitrogen and phosphorus removal efficiency decreased from 77% to 33.3% when the influent ammonium concentration increased from 20 mg/l to 80 mg/l. However, in the SBBR, simultaneous nitrification/denitrification (SND) occurred, and the nitrification rate in the aerobic phase did not change remarkably in spite of the increase in influent ammonium concentration. Phosphorus removal was not affected by the increase of influent ammonium concentration.

/pdf/characteristics-of-nitrogen-and-phosphorus-removal-in-sbr-2g58gmyaim.pdf

Characteristics of nitrogen and phosphorus removal in SBR and SBBR with different ammonium loading rates

This study investigated the degradation of N, N-Dimethyl-4-nitrosoaniline (RNO, indicator of the generation of OH radical) by using dielectric barrier discharge (DBD) plasma. The DBD plasma reactor of this study consisted of a quartz dielectric tube, titanium discharge (inner) and ground (outer) electrode. The effect of shape (rod, spring and pipe) of ground electrode, diameter (9 ～ 30 mm) of ground electrode of spring shape and inside diameter (4 ～ 13 mm) of quartz tube, electrode diameter (1 ～ 4 mm), electrode materials (SUS, Ti, iron, Cu and W), height difference of discharge and ground electrode (1 ～ 15.5 cm) and gas flow rate (1 ～ 7 L/min) were evaluated. The experimental results showed that shape of ground electrode and materials of ground and discharge electrode were not influenced the RNO degradation. The thinner the diameter of discharge and ground electrode, the higher RNO degradation rate observed. The effect of height gap of discharge between ground electrode on RNO degradation was not high within the experimented value. Among the experimented parameters, inside diameter of quartz tube and gas flow rate were most important parameters which are influenced the decomposition of RNO. Optimum inside diameter of quartz tube and gas flow rate were 7 mm and 4 L/min, respectively.

https://www.koreascience.or.kr:443/article/JAKO201118834667161.pdf

A Basic Study of Plasma Reactor of Dielectric Barrier Discharge for the Water Treatment

The detection/sensing properties of chemiresistive gas sensors are greatly improved by catalytically triggered bimetallic alloyed nanoparticles, because of their synergistic effect. In this work, well-defined AgAualloy@ZnO core-shell nanoparticles are synthesized with the various compositions of Ag and Au. Alloying Au with Ag gave superior thermal stability to Ag, which favored gas sensing performance. As the amount of Ag within the AgAualloy core increased, the optimum working temperature was lowered to 300 ℃ with the dramatically enhanced ultra-high response of 1755 was obtained for Ag70Au30 @ZnO NPs sensor to 100 ppm ethanol. The outstanding sensing performance of AgAualloy@ZnO were endorsed to the improved the electronic and catalytic properties of AgAualloy core, aplenty chemisorbed oxygen on the surface of ZnO, unique core-shell structure that bring large active surface area and enhanced electron transfer process at the interface between core and shell. Ultraviolet photoelectron spectroscopy (UPS) analysis shows that with increasing Ag concentration, the work function (ϕ) decreases and the chemisorbed oxygen increases that brings wider depletion layer and Schottky barrier between the AgAualloy core and the ZnO shell, enhancing the gas sensing response. Our findings suggest that the incorporation of noble metal alloy-metal oxide semiconductor based core-shell nanostructures enhance the gas sensing performance with selectivity in the practical field of applications in environmental issues and human health monitoring. 

Dongseog Kim

Papers

Crab shell for the removal of heavy metals from aqueous solution.

Shift of the reactive species in the Sb-SnO2-electrocatalyzed inactivation of e. coli and degradation of phenol: effects of nickel doping and electrolytes.

Characteristics of nitrogen and phosphorus removal in SBR and SBBR with different ammonium loading rates

A Basic Study of Plasma Reactor of Dielectric Barrier Discharge for the Water Treatment

Bimetallic AgAualloy@ZnO Core-Shell Nanoparticles for Ultra-High Detection of Ethanol: Potential Impact of Alloy Composition on Sensing Performance