This paper evaluates Malatya clay (MC) for the removal of Ni(II) ions from aqueous solutions. For adsorption efficiency, the impacts of several factors, such as pH, starting metal ion concentration, and contact duration, were examined. The optimal initial Ni(II) ion concentration was determined to be 5 mg/L, the adsorption contact duration was 360 min, and the solution's pH was 6.27. Using scanning electron microscopy, energy dispersive spectroscopy, and Fourier transform infrared spectroscopy, the surface characteristics of Malatya clay were examined. The isotherm data fit the Langmuir isotherm model, indicating chemical adsorption and likely irreversibility of the process, according to the results. At 298, 308, and 318 K, the adsorption capacities of Ni(II) were determined to be 10.267, 11.834, and 12.285 mg/g, respectively. Adsorption kinetic data revealed that the adsorption of Ni(II) metal ions followed the pseudo‐second‐order kinetic model. According to thermodynamic studies, Ni(II) ion adsorption on the MC is spontaneous and endothermic. MC has proven to be an effective and alternative material for the removal of Ni(II) ions from aqueous media due to its excellent removal ability, availability, and low cost, as well as its features such as being able to be used without any chemical treatment and being environmentally friendly.

Bu çalışmada Diyarbakır bölgesinin Karacadağ Kırmızı Tepe volkan konisinden alınan bazaltik pomza (BR1) adsorplayıcı olarak kullanılmıştır. BR1'in mikroskobik ve makroskopik özellikleri belirlendi. BR1, XRD, XRF, BET, FTIR, BET ve SEM gibi yöntemlerle karakterize edildi. Adsorpsiyona etki eden parametrelerden olan farklı süre ve sıcaklıklarda çalışıldı. Adsorpsiyon miktarları 298, 313 ve 328 K için sırasıyla 1.97, 2.15 ve 2.58 mg g -1 olarak bulundu. Deneyden elde edilen veriler; Lagergren yalancı birinci dereceden kinetik modeli (pseudo firs tmodel), Ho-McKay yalancı ikinci dereceden modeli (pseudo second model), parçacık içi difüzyon modeli (Weber-Morris model), ve Elovich kinetik modeli olmak üzere 4 kinetik modele uygulandı. Cu(II) nin adsorpsiyon kinetik mekanizmasının, en çok Ho McKay modeli olarak bilinen ikinci dereceden hız denklemine uyduğu görülmekle beraber, Elovich hız denklemine de uyduğu değerlendirildi.

Toxic effect of textile dyes their increasing quantities in air, soil and water environments, because of growing of industrial activities, they must be taken into consideration since they give harm to the environment. We come across textile dyes in natural wetlands as result of uncontrolled industrial wastes. Textile dyes that can accumulate easily in their environments may show toxic effects. Pumice, accruing as a result of volcanic events and durable against chemical factors, is a rock that has porous structure. Pumices have a porous structure because of sudden cooling of the rock and sudden leaving of gases a result of volcanic events. Thanks to these pores, pumices' heat and sound insulation are quite high. The most distinctive feature of pumice from other rocks is that it has different colors and there is not crystal water in its porous structure. Adsorption studies are applied with Van Pumice at pH = 6, the adsorption mechanism and changing dye concentration. As result of these researches, it has been found out that there are different adsorption movements at pH 6 between Neutral Red and Van Pumice. The result of this study shows that the Pumice found in Lake Van gives a better fit for the Langmuir Isotherm (model) and the amount of adsorption increases with the temperature. We thereby conclude that the Pumice located in Lake Van is a recommended adsorbent for filtering the used textile dye in aqueous medium.

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One of the most significant environmental pollutions is water pollution. Water pollution, which is a problem all over the world, has been increasing recently due to unconscious and contemptuous water usage and will inevitably lead to water wars. In this context, it has become a necessity to reduce water pollution and raise awareness among people. One of the effective and inexpensive methods among the studies on this subject is adsorption. The main purpose of this study is to remove Ni (II) ions from aqueous solutions. For this, mixed type clay was used as adsorber. Clay obtained from the Koçpınar town of Siirt is preferred because it can be obtained easily and it’s cost is low. To determine the characterization of the clay, SEM, XRD XRF and FT-IR analyzes were performed. The results obtained from these analyzes showed that the clay was of mixed type. Pseudo-second-order kinetic models are widely applied to data from most adsorption kinetic studies to describe the adsorption mechanism of adsorbate on adsorbent. In this research, 6 different types of pseudo-second order kinetic equations were applied to values at 298 K temperature. The obtained data were applied to six types of linear equations. R2, K2 and qm values were calculated by creating graphs in the light of abovementioned data. As a result of the obtained data, it was understood that adsorption kinetics comply with type 6 equation at most.