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Journal Articles

Radiation-induced grafting of dimethylaminoethylmethacrylate onto PE/PP nonwoven fabric

Kavakli, P. A.*; Kavakli, C.*; Seko, Noriaki; Tamada, Masao; G$"u$ven, O.*

Nuclear Instruments and Methods in Physics Research B, 265(1), p.204 - 207, 2007/12

 Times Cited Count:28 Percentile:87.94(Instruments & Instrumentation)

A novel nonwoven fabric was prepared by radiation-induced graft polymerization of dimethylaminoethylmethacrylate (DMAEMA) onto polypropylene coated polyethylene nonwoven fabric. The trunk polymer was irradiated by electron beam at a voltage of 2 MeV and a current of 3 mA in a nitrogen atmosphere at dry-ice temperature at different doses. The degree of grafting was determined as a function of the total dose, monomer concentration, temperature, and reaction time. It was found that the degree of grafting of grafted polymer was greatly affected by reaction conditions. Grafting conditions were optimized, and about 150 % degree of grafting samples was used for further experiments. DMAEMA grafted polymer was later protonated by using acid solution to prepare adsorbent for the removal of anions. Adsorption experiments were performed in column mode for removal of hosphate. Approximately 2000 bed volumes of phosphate-free water can be produced from 10 ppb phosphate solution at high space velocity.

Journal Articles

Adsorption efficiency of a new adsorbent towards uranium and vanadium ions at low concentrations

Kavakli, P. A.*; Seko, Noriaki; Tamada, Masao; G$"u$ven, O.*

Separation Science and Technology, 39(7), p.1631 - 1643, 2005/00

 Times Cited Count:52 Percentile:84.2(Chemistry, Multidisciplinary)

A new type of fibrous adsorbent with excess amidoxime groups was synthesized by radiation-induced graft polymerization. Glycidyl methacrylate (GMA) was first radiation-grafted on polyethylene-coated polypropylene nonwoven fabrics and chemically modified with 3,30-iminodipropionitrile [NH (-CH$$_{2}$$-CH$$_{2}$$-CN)$$_{2}$$] (IDPN), which was further reacted with hydroxylamine to obtain graft chains containing two amidoxime groups per graft repeating units. The adsorption properties of this new adsorbent for uranium (U), vanadium (V), lead (Pb), copper (Cu), and cobalt (Co) ions at low concentrations (3.3-1000 ppb).

Oral presentation

Preparation of novel amidoxime adsorbent by grafting for removal of metal ions

Kavakli, P. A.*; Seko, Noriaki; Tamada, Masao; G$"u$ven, O.*

no journal, , 

no abstracts in English

Oral presentation

Synthesis of a new adsorbent for uptake of significant metal ions in seawater by radiation induced graft polymerization

Kavakli, P. A.*; Seko, Noriaki; Tamada, Masao; G$"u$ven, O.*

no journal, , 

no abstracts in English

Oral presentation

Preparation of arsenic selective polymeric adsorbent by modification of radiation grafted glycidyl methacrylate (GMA) nonwoven fibers

Kavakli, C.*; Kavakli, P. A.*; Seko, Noriaki; Tamada, Masao; G$"u$ven, O.*

no journal, , 

Glycidyl methacrylate (GMA) was grafted onto polypropylene coated polyethylene nonwoven fabrics in emulsion system by using radiation induced graft polymerization. For the preparation of GMA grafted fabric, the trunk PE/PP nonwoven fabric was irradiated by electron beam. After irradiation process, GMA was grafted onto irradiated nonwoven fabric under nitrogen atmosphere. In order to prepare fibrous PLE adsorbent for the removal of arsenic, grafted GMA was first modified with dipicolylamine. Maximum modification was obtained in 15 % (w/w) dipicolylamine solution. Then, PLE adsorbent was loaded with Cu$$^{2+}$$ ions. High copper ion loading was observed for PLE fibers. Column mode adsorption studies were conducted with copper loaded PLE adsorbents at different arsenic concentrations (1-50 ppm) and pH to examine the removal of arsenic (V) in aqueous solutions. The breakthrough point of As (V) was found to be 8000 bed volumes for 1 ppm As (V) solution.

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