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The effect of demineralization on the physicochemical and sorption properties of activated bio-carbons

Residues after supercritical extraction of hops were chosen as activated bio-carbons precursor. The actual adsorbent was prepared by physical activation of the starting material. Some amount of the activated bio-carbon was divided into two parts. One of them was washed with distilled water, while the other part of the activated bio-carbon was washed first with a 5% solution of...

Comparison of physicochemical, sorption and electrochemical properties of nitrogen-doped activated carbons obtained with the use of microwave and conventional heating

A series of new nitrogen-doped activated carbons has been obtained via the reaction with urea and chemical activation of Polish brown coal. In order to obtain nitrogen groups bonded in different ways to the carbonaceous matrix, the modification with urea was performed at two different stages of processing, i.e. precursor or char. Additionally, the effects of conventional or...

Removal of Iron and Copper Ions from the Liquid Phase by Modified Polymeric Membranes

Laboratory of Applied Chemistry, Faculty of Chemistry, Adam Mickiewicz University in Poznań , Umultowska 89b, 61‐614 Poznań , Poland 1 Robert Pietrzak Preparation of polymeric membranes based on cellulose

Physicochemical characterization of ordered mesoporous carbons functionalized by wet oxidation

Ordered mesoporous carbon obtained by the soft template method was subjected to oxidation with the use of ammonium persulfate or nitric acid. The material was modified in different conditions in order to generate on its surface oxygen functional groups. Functionalization of carbon with nitric acid or ammonium persulfate at low temperatures caused a reduction in its surface area...

The use of microwave radiation for obtaining carbonaceous adsorbents from biomass and their use in elimination of inorganic pollutants

Kazmierczak-Razna & Robert Pietrzak 1 Introduction Climate changes and the need to reduce the use of nonrenewable resources and energy have become the fundamental problems of our times. Their solution

The effect of surface modification of mesoporous carbons on Auramine-O dye removal from water

, Adam Mickiewicz University in Poznan ́ , Umultowska 89b, 61-614 Poznan ́ , Poland 1 & Robert Pietrzak 2 & Joanna Goscianska Mesoporous carbon of regular structure was subjected to oxidation by ammonium

Preparation and physicochemical characterisation of functionalised multi-walled carbon nanotubes

A series of new functionalised carbonaceous materials were prepared by means of oxidation and ammoxidation of commercially available multi-walled carbon nanotubes. The effect of oxygen and nitrogen doping on the textural, surface as well as thermal properties of the prepared adsorbents was tested. The materials were characterized by elemental analysis, low-temperature nitrogen...

Metals Ions Removal by Polymer Membranes of Different Porosity

, Umultowska 89b, 61-614 Poznań, Poland Received 20 March 2013; Accepted 13 May 2013 Academic Editors: B. Dou and P. Granger Copyright © 2013 Katarzyna Jasiewicz and Robert Pietrzak. This is an open access

NO2 removal on adsorbents prepared from coffee industry waste materials

Piotr Nowicki 0 Paulina Skibiszewska 0 Robert Pietrzak 0 0 P. Nowicki (&) P. Skibiszewska R. Pietrzak Laboratory of Applied Chemistry, Faculty of Chemistry, Adam Mickiewicz University in Poznan

Comparison of ordered mesoporous materials sorption properties towards amino acids

Joanna Goscianska 0 Anna Olejnik 0 Robert Pietrzak 0 0 J. Goscianska A. Olejnik R. Pietrzak (&) Faculty of Chemistry, Adam Mickiewicz University in Poznan , Umultowska 89b, 61-614 Poznan, Poland The

Nitrogen-Doped Carbonaceous Materials for Removal of Phenol from Aqueous Solutions

University, Grunwaldzka 6, 60-780 Poznań, Poland Received 10 October 2011; Accepted 22 December 2011 Academic Editors: J. Canário, Q. Wang, and Z. Zhang Copyright © 2012 Magdalena Hofman and Robert ... Pietrzak. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work

Sorption properties of activated carbons obtained from corn cobs by chemical and physical activation

Justyna Kazmierczak Piotr Nowicki Robert Pietrzak The paper presents results of a study on obtaining activated carbon from common corn cobs and on its use as adsorbent for removal of pollution from

Complex of Rutin with β-Cyclodextrin as Potential Delivery System

This study aimed to obtain and characterize an RU-β-CD complex in the context of investigating the possibility of changes in the solubility, stability, antioxidative and microbiological activity as well as permeability of complexated rutin as against its free form. The formation of the RU-β-CD complex via a co-grinding technique was confirmed by using DSC, SEM, FT-IR and Raman...

“Pi of the Sky” Detector

Mankiewicz,1 Krzysztof Nawrocki,2 Robert Pietrzak,5 Lech W. Piotrowski,3 Maria Ptasińska,6 Małgorzata Siudek,6 Marcin Sokołowski,2 Janusz Użycki,2 Piotr Wawer,5 Roman Wawrzaszek,5 Grzegorz Wrochna,2 Marcin

“Pi of the Sky” Detector

“Pi of the Sky“ experiment has been designed for continuous observations of a large part of the sky, in search for astrophysical phenomena characterized by short timescales, especially for prompt optical counterparts of Gamma Ray Bursts (GRBs). Other scientific goals include searching for novae and supernovae stars and monitoring of blasars and AGNs activity. “Pi of the Sky“ is a...

“Pi of the Sky” Detector

Mankiewicz,1 Krzysztof Nawrocki,2 Robert Pietrzak,5 Lech W. Piotrowski,3 Maria Ptasińska,6 Małgorzata Siudek,6 Marcin Sokołowski,2 Janusz Użycki,2 Piotr Wawer,5 Roman Wawrzaszek,5 Grzegorz Wrochna,2 Marcin