Efficient electrochemical oxidation of thallium (I) in groundwater using boron-doped diamond anode

Electrochemical oxidation of thallium (I) in groundwater by employing single-chamber microbial fuel cells as renewable power sources

“…Tl(I) and glucose acted as electron donors and Tl(I) was bio-electrochemically oxidized through co-metabolisms pathway, with anodic electrode as electron acceptor and simultaneous precipitation of oxidation products. Similar phenomenon had also been found for As(III) removals in the anode of MFCs [40]. Under this situation, slight declines of maximum power density from 518.5 mW m -2 to 431.6 mW m -2 were observed due to the high toxicity of Tl to microbes [4], but the voltage outputs above 600 mV could also be maintained when the AER was connected to this MFC fed with the Tl-containing medium, implying that the MFC could also function well as power sources under this situation with removing Tl(I) simultaneously.…”

“…Active substances and oxidation efficiency were monitored synchronously to study the oxidation mechanisms, and the results were compared with those from control experiments. Experiments were also conducted with addition of FeSO4-EDTA (0.1 mM) as H2O2 scavenger to confirm its functions during Tl(I) oxidation as Fe(II) could be firstly oxidized to Fe(III) by H2O2 if it existed in the solution to realize the removals of H2O2 [39,40]. Then influencing factors as anode materials (carbon felt, carbon cloth, graphite plate), initial Tl(I) concentration (1 mg L -1 , 5 mg L -1 ,10 mg L -1 ,15 mg L -1 ), initial pH (1.5, 2.0, 2.5, 3.0), applied voltage (200 mV, 400 mV, 600 mV, 700 mV) were examined separately.…”

“…The removal efficiency of total Tl with PFS was slightly lower than with ferric chloride while direct adjusting the pH of exhausted electrolyte to 9 only realized about 25% of total Tl removal. Meanwhile, direct treatment of raw Tl(I) solution by adding the same amount of ferric chloride was also performed, and total Tl was rarely removed due to the strong mobility of Tl(I) [40].…”

Rapid Photocatalytic Decolorization of Methyl Orange under Visible Light Using VS4/Carbon Powder Nanocomposites

“…The MO solution sample was added to the mixture of potassium iodide (KI) and ammonium molybdate, shaken quickly, and monitored by a UV–visible spectrophotometer (DR 5000, HACH, USA) at 352 nm for H 2 O 2 determination. The hydroxyl radical was determined by using the dimethyl sulfoxide (DMSO) method. , To investigate the changes in the molecule and structural characteristics of MO with photocatalytic decolorization, the full-wavelength scan was monitored by a UV–visible spectrophotometer (DR 5000, HACH, USA) . To determine the decolorization products, gas chromatography/mass spectrometry (GC/MS, Trace GC-DSQ, Thermo Fisher, TR-35MS, 30 m × 0.25 mm × 0.25 μm) analysis was performed .…”

A Thallium Ion Sensor Development Based on the Synthesized (E)‐N′‐(Methoxybenzylidene)‐4‐ Methylbenzenesulfonohydrazide Derivatives: Environmental Sample Analysis

“…Signal response from an electrochemical sensor may be good to another transduction scheme in terms of exactness, sensitivity, selectivity, response time, and constancy . Heavy metal (HM) such as thallium is a bio‐accumulative element and exists in the earth crust as a native metal or coupled with soil and bed rock at very low concentrations . Thallium (Tl) imposes stronger toxicity towards mammals and fish than other HM for example Cd 2+ , Cu 2+ , Hg 2+ , Pb 2+ , and Zn 2+ .…”