scholarly journals Design of Polymer-Embedded Heterogeneous Fenton Catalysts for the Conversion of Organic Trace Compounds

Processes ◽  
2021 ◽  
Vol 9 (6) ◽  
pp. 942
Author(s):  
Christoph Horn ◽  
Stephanie Ihmann ◽  
Felix Müller ◽  
Doris Pospiech ◽  
Konstantin B. L. Borchert ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Iron Oxide ◽  
High Catalytic Activity ◽  
Reactive Black 5 ◽  
Heterogeneous Fenton ◽  
Iron Leaching ◽  
Trace Compounds ◽  
Organic Trace Compounds ◽  
Organic Trace ◽  
Supported Iron

Advanced oxidation processes are the main way to remove persistent organic trace compounds from water. For these processes, heterogeneous Fenton catalysts with low iron leaching and high catalytic activity are required. Here, the preparation of such catalysts consisting of silica-supported iron oxide (Fe2O3/SiOx) embedded in thermoplastic polymers is presented. The iron oxide catalysts are prepared by a facile sol–gel procedure followed by thermal annealing (calcination). These materials are mixed in a melt compounding process with modified polypropylenes to stabilize the Fe2O3 catalytic centers and to further reduce the iron leaching. The catalytic activity of the composites is analyzed by means of the Reactive Black 5 (RB5) assay, as well as by the conversion of phenol which is used as an example of an organic trace compound. It is demonstrated that embedding of silica-supported iron oxide in modified polypropylene turns the reaction order from pseudo-first order (found for Fe2O3/SiOx catalysts), which represents a mainly homogeneous Fenton reaction, to pseudo-zeroth order in the polymer composites, indicating a mainly heterogeneous, surface-diffusion-controlled process.

Analysing surface water-groundwater interactions on selected sites of the River Moselle: Identifying transport processes along an important inland waterway in Germany

2021 ◽  
Author(s):  
Simon Mischel ◽  
Michael Engel ◽  
Sabrina Quanz ◽  
Dirk Radny ◽  
Axel Schmidt ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Surface Water ◽  
Transport Processes ◽  
Main Stream ◽  
Flow Conditions ◽  
Inland Waterway ◽  
Trace Compounds ◽  
Organic Trace Compounds ◽  
Longitudinal Sampling ◽  
Organic Trace

<p>Hydraulic engineering structures like locks affect the natural hydraulic conditions and have a relevant impact on surface water – groundwater interactions due to enlarging the hydraulic gradient. For this, these sites are excellent areas to study associated flow paths, mass transport and their spatial and temporal variability in higher detail. However, no large-scale study at an inland waterway is available in Germany until now.</p><p>Our work aims to close this gap by applying a multiparameter approach for analyzing surface water-groundwater-interactions by using pH, electrical conductivity, major ions in combination with various other tracers like stable water isotopes, 222-Rn, and tritium. In this context, we also investigate the usability of organic trace compounds and their associated transformation products as potential new tracers.</p><p>The main study approach is based on the hypothesis that i) gaining stream sections show relatively high 222-Rn concentrations originating from discharging groundwater and ii) losing stream sections which are characterized by low 222-Rn concentrations as well as lower tritium and organic trace compounds inventories compared to unaffected areas.</p><p>During different flow-scenarios of the river Moselle, we test these hypotheses by means of a high-resolution longitudinal sampling at 2 km intervals of the main stream (along 242 km) and its major tributaries in combination with groundwater sampling at numerous wells.</p><p>Here, we present the first results of the longitudinal sampling campaign of the river Moselle in October 2020, which took place during intermediate flow conditions (Q=200 m³/s). We used on-site and in-situ 222-Rn measurements and electrical conductivity as a tracer to immediately identify zones along the Moselle with increased groundwater inflow.</p><p>With the use of these tracers, we will deepen the conceptual process understanding of surface water – groundwater interactions occurring at larger streams and during different flow conditions, which may lead to a general river characterization of losing and gaining stream reaches. Moreover, understanding the sources of water compounds and the processes involved during transportation and transformation is crucial for maintaining a good quality of the water body, which is key for proper water management. The findings obtained in the region of the Moselle river might be further transferred to other waterways and support decision making.</p>

Silica-supported iron oxide nanoparticles: unexpected catalytic activity in hydrogenation of phenylacetylene

2017 ◽  
Vol 27 (5) ◽  
pp. 512-514 ◽  
Author(s):  
Anastasiya A. Shesterkina ◽  
Elena V. Shuvalova ◽  
Elena A. Redina ◽  
Olga A. Kirichenko ◽  
Olga P. Tkachenko ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Supported Iron

Organic trace compounds in the water of the River Elbe near Hamburg part II

Chemosphere ◽  
1998 ◽  
Vol 36 (9) ◽  
pp. 2103-2118 ◽  
Author(s):  
R. Götz ◽  
O.H. Bauer ◽  
P. Friesel ◽  
K. Roch
Keyword(s):  
River Elbe ◽  
Trace Compounds ◽  
Organic Trace Compounds ◽  
Organic Trace

Pyrite cinder as a cost-effective heterogeneous catalyst in heterogeneous Fenton reaction: decomposition of H2O2 and degradation of Acid Red B

2014 ◽  
Vol 70 (9) ◽  
pp. 1548-1554 ◽  
Author(s):  
Deli Wu ◽  
Yanxia Liu ◽  
Dong Duan ◽  
Luming Ma
Keyword(s):  
Catalytic Activity ◽  
Metal Ions ◽  
Cost Effective ◽  
High Catalytic Activity ◽  
Order Kinetic ◽  
Pyrite Cinder ◽  
Heterogeneous Fenton ◽  
Kinetic Rate Constant ◽  
Heterogeneous Fenton Reaction ◽  
Decomposition Of H2o2

Pyrite cinder (PyC) was employed as a heterogeneous Fenton-like catalyst, and its catalytic activity was evaluated in view of the effects of catalyst dosage, pH and leaching metal ions. PyC showed significant reactivity, and the pseudo-first-order kinetic rate constant for decomposition of H2O2 and degradation of Acid Red B (ARB) were 3.4 and 14.89 (10−3 min−1) respectively when pH = 5. When 20 g/L PyC was added into 10 mM H2O2 solution in neutral pH, H2O2 could be completely degraded within 4 h, and more than 90% ARB was removed. Leaching metal ions from PyC were found to have little effect on decomposition of H2O2 or on degradation of ARB. PyC still had high catalytic activity after five successive runs. The decomposition mechanism of H2O2 was analyzed and the Haber–Weiss mechanism was employed in this paper. The electron spin resonance image showed •OH was produced and increased between 3 and 5 min in the PyC catalyzing H2O2 reaction, which demonstrated that PyC had a durable ability to produce •OH.

A Proposed Suite of Indicators for Assessing the Efficiency of Secondary Treatment for the Removal of Organic Trace Compounds — WERF CEC4R08

2011 ◽  
Vol 2011 (11) ◽  
pp. 5041-5048
Author(s):  
Tanja Rauch-Williams ◽  
Eric Dickenson ◽  
Jörg E. Drewes ◽  
Douglas Drury ◽  
Daniel Gerrity ◽  
...  
Keyword(s):  
Secondary Treatment ◽  
Trace Compounds ◽  
Organic Trace Compounds ◽  
Organic Trace

scholarly journals Obtenção de catalisador nanoestruturado utilizando óxido de ferro suportado em resíduo de cerâmica vermelha

2019 ◽  
Vol 40 ◽  
pp. 94
Author(s):  
Fabiele Schaefer Rodrigues ◽  
Marcela Trojahn Nunes ◽  
Jocenir Boita
Keyword(s):  
Catalytic Activity ◽  
Iron Oxide ◽  
Hydrothermal Method ◽  
Scientific Community ◽  
National Laboratory ◽  
High Catalytic Activity ◽  
Nanostructured Catalyst ◽  
Synchrotron Light ◽  
Object Of Study ◽  
Technological Interest

The use of nanoparticles in the field of catalysis has been the object of study by the scientific community, due to the high catalytic activity that the nanoparticles have in front of some reactions of technological interest. The objective of this work is to obtain a nanostructured catalyst using iron oxide supported on red ceramic residue (RCV), through nanostructures synthesized by the hydrothermal method, measured through the absorption of lightning in the XANES region through the National Laboratory of Synchrotron Light LNLS).

Reduction of organic trace compounds and fresh water consumption by recovery of advanced oxidation processes treated industrial wastewater

2013 ◽  
Vol 69 (1) ◽  
pp. 156-162 ◽  
Author(s):  
S. Bierbaum ◽  
H.-J. Öller ◽  
A. Kersten ◽  
A. Krivograd Klemenčič
Keyword(s):  
Fresh Water ◽  
Advanced Oxidation Processes ◽  
Paper Industry ◽  
Advanced Oxidation ◽  
Organic Load ◽  
Paper Strength ◽  
Oxidation Processes ◽  
Trace Compounds ◽  
Organic Trace Compounds ◽  
Organic Trace

Ozone (O3) has been used successfully in advanced wastewater treatment in paper mills, other sectors and municipalities. To solve the water problems of regions lacking fresh water, wastewater treated by advanced oxidation processes (AOPs) can substitute fresh water in highly water-consuming industries. Results of this study have shown that paper strength properties are not impaired and whiteness is slightly impaired only when reusing paper mill wastewater. Furthermore, organic trace compounds are becoming an issue in the German paper industry. The results of this study have shown that AOPs are capable of improving wastewater quality by reducing organic load, colour and organic trace compounds.

C4-C14-alkyl nitrates as organic trace compounds in air

1994 ◽  
Vol 350 (6) ◽  
pp. 395-402 ◽  
Author(s):  
Oliver Luxenhofer ◽  
Karlheinz Ballschmiter
Keyword(s):  
Alkyl Nitrates ◽  
Trace Compounds ◽  
Organic Trace Compounds ◽  
Organic Trace
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