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Dive into the research topics where M. H. Alma is active.

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Featured researches published by M. H. Alma.


Journal of Colloid and Interface Science | 2004

Copper (II) adsorption from aqueous solution by herbaceous peat

Recep Gundogan; Bilal Acemioğlu; M. H. Alma

In this research, the herbaceous peat collected from Gavurgolu peatlands, one of the biggest Turkish peatlands, was utilized as an adsorbent for the removal of copper (II) ions from aqueous solution. Adsorption experiments were conducted under various conditions, i.e., initial concentration, temperature, and pH. While the amount of Cu (II) adsorbed on the peat increased with increasing concentration of Cu (II) ions, it was not markedly affected by temperature and pH. Percentage removal was higher at lower concentration. For example, the maximum percentage removal of Cu (II) ions for initial concentration of 3 x 10(-4) M was 97.04% at 21 degrees C and pH 5.5. The adsorption capacity (Q(0)) of the peat was 4.84 mgg(-1) from Langmuir adsorption isotherm for the concentration range of 3 x 10(-4)-6 x 10(-4) M at 21 degrees C and pH 5.5. The equilibrium time of adsorption of Cu (II) ions was 150 min and independent of concentration and temperature. The amount of Cu (II) adsorbed at equilibrium time did not considerably change with temperature and pH. It was also determined that adsorption isotherm followed both Freundlich and Langmuir. Uptake mechanism of Cu (II) ions by the peat occurs via cation exchange (especially by means of Ca(2+) and Mg(2+)) as well as copper/peat complexation. Adsorption kinetic was consistent with the pseudo-second-order model.


Wood Science and Technology | 1995

Preparation and characterization of the phenolated wood using hydrochloric acid (HCl) as a catalyst

M. H. Alma; Mariko Yoshioka; Y. Yao; Nobuo Shiraishi

SummaryBirch (Betula maximowicziana Regel) wood meal was liquefied in the presence of phenol using hydrochloric acid (HCl) as a catalyst at a temperature of 150 °C for 2 h in an autoclave. It was found out that HCl acid could be used as an effective catalyst for the hydroxy phenylation of wood under the experimental conditions. In this study the effect of the concentration of the acid catalyst and the phenol-to-wood ratio on the liquefaction were investigated. The results showed that the phenol-to-wood ratio and the concentration should be increased to a certain degree in order to achieve a less residual rate and sufficient amount of combined phenol. The phenolated woods had apparent flow temperatures in the range of 134.4 to 199.8 °C, being higher than that of a commercial novolak resin. Furthermore, increases in the HCl concentration during liquefaction reaction led to increase in the apparent flow temperature of the resulting phenolated woods. However, the changes in the liquid ratio did not bring about evident changes. The relationship between shear stress (τ) and shear rate


Journal of Polymer Engineering | 1998

LIQUEFACTION OF SEVERAL BIOMASS WASTES INTO PHENOL IN THE PRESENCE OF VARIOUS ALKALIS AND METALLIC SALTS AS CATALYSTS

M. H. Alma; D. Maldas; Nobuo Shiraishi


Chemical Engineering Communications | 2004

A KINETIC STUDY OF SULFURIC ACID-CATALYZED LIQUEFACTION OF WOOD INTO PHENOL

M. H. Alma; Bilal Acemioğlu

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European Journal of Wood and Wood Products | 1998

Preparation of polyurethane-like foams from NaOH-catalyzed liquefied wood

M. H. Alma; Nobuo Shiraishi


Journal of Applied Polymer Science | 1996

Phenolation of wood using oxalic acid as a catalyst: Effects of temperature and hydrochloric acid addition

M. H. Alma; Mariko Yoshioka; Y. Yao; Nobuo Shiraishi

showed that the phenolated wood resin melts were shear thinning fluids. The dependences of the apparent melt-viscosities (η) of the phenolated woods and a commercial novolak resin on the shear rates (


International Journal of Polymeric Materials | 1996

Dimensional stability of several wood species treated with vinyl monomers and polyethylene glycol-1000

M. H. Alma; H. Hafizo lu; D. Maldas


European Journal of Wood and Wood Products | 2004

Sorption of copper (II) ions by pine sawdust

Bilal Acemioğlu; M. H. Alma

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Journal of Materials Science Letters | 2000

The tensile properties of molding products obtained by the condensation of various tree barks and phenol by using sulfuric acid as a catalyst

M. H. Alma; Stephen S. Kelley; I. Bektaş


Pharmaceutical Biology | 2002

Antibiotic Action of Seed Lipids from Five Tree Species Grown in Turkey

Metin Digrak; Eyup Bagci; M. H. Alma

) have the similar tendencies, however, it was found the viscosities of the phenolated woods are about one order higher than that of commercial novolak resin.

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Bilal Acemioğlu

Kahramanmaraş Sütçü İmam University

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Metin Digrak

Kahramanmaraş Sütçü İmam University

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Tufan Salan

Kahramanmaraş Sütçü İmam University

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Ertugrul Altuntas

Kahramanmaraş Sütçü İmam University

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Eyyüp Karaoğul

Kahramanmaraş Sütçü İmam University

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D. Maldas

Université du Québec

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Mustafa Yazıcı

Kahramanmaraş Sütçü İmam University

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İsmail Tiyek

Kahramanmaraş Sütçü İmam University

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