Adsorption of cadmium (II) by using clays modified with ultrasound

WOS: 000473124300004The aim of this study is to investigate the Cd(II) adsorption from aqueous solutions with raw and ultrasound clay samples. In the batch experiments, effect of the some parameters such as contact time, pH levels, temperature, stirring rate on the adsorption were investigated. Brunauer-Emmett-Teller (BET) surface area of the clay samples increased from 28.5 m(2)/g to 52.7 m(2)/g result of ultrasound modification. Adsorption systems were best described with pseudo second order kinetic model and Langmuir isotherm. It was determined that the maximum adsorption capacity of the ultrasound modified clay samples is higher compared to raw clay samples. It was determined that the optimum pH value is 6, and the optimum stirring speed is 250 rpm for the adsorption. Adsorption for modified and raw clay samples increased significantly with increasing system temperature which revealed the endothermic nature of the adsorption

Adsorption kinetics of methylene blue removal from aqueous solutions using potassium hydroxide (KOH) modified apricot kernel shells

Namal, Osman Onder/0000-0002-3182-4788WOS: 000482674100001In this study, the adsorption kinetics of methylene blue (MB) with potassium hydroxide (KOH) modified apricot kernel shells were investigated. It was observed that the surface acidity decreased the result of the oxidation carboxylic groups after basic treatment. According to obtained values from kinetic studies, the required time to reach equilibrium is about 240 minutes. The rate-limiting step was found as chemisorption and the pore diffusion is not only rate-limiting step on the adsorption process. The adsorption process was best described by the Langmuir isotherm model and obtained q(m) value is 33.67 mg/g at 25 degrees C temperature. The adsorption took place as endothermic (Delta H = 27.92 kj/mol). Adsorption capacity increased considerably depending on increasing pH. Optimum agitation speed was determined as 250 rpm

Evaluation of Irrigation Water Quality of Aksaray Region By Using Geographic Information System

In this study, the quality of irrigation water was determined in Aksaray region which is one of the most important agricultural lands of Turkey, the facts causing pollution were specified and the precautions that should be taken were discussed. Within the scope of this study, 38 samples were taken from the water of 24 wells, 4 dams, 9 ponds and 1 source water. In order to use the data more effectively, irrigation water quality index map of Aksaray region including the results of the samples (EC, SAR, B, Cl-, NO3-, HCO3- and pH) was prepared by using Geographic Information System (GIS). According to irrigation water quality index map, all surface water sources were found to be suitable for irrigation with high and medium irrigation water quality index. EC, SAR, Cl, HCO3 values were found as high in Acipinar well and Aratol well regions whereas EC and Cl values were high in Taspinar well region. It was determined that underground water sources have low irrigation water quality index value along in the range of Taspinar region and Tuz Lake whereas they have generally medium irrigation water quality index value. The soil being heavy-texture and salty structure in the region and the level of ground water being high were caused by lack of adequate drainage system. For this reason, good and adequate drainage system should be configured in order to provide no increase in salt accumulation in the soil, to get an opportunity for more appropriate land use and to increase the yield per unit area

Pollution in Melendiz Water Basin Groundwater

WOS: 000304430500016In our study, samples were taken from the groundwater that is used for drinking and irrigation in the Melendiz Water Basin, and the quality of water and the factors causing pollution were determined by evaluating them according to "Continental Water Sources Quality Classification Criterions" (Republic of Turkey Ministry of Environment and Forest/Regulation for Water Pollution Control). When the analysis results of samples taken between 2006 and 2009 were compared, it was determined that the amount of pollution increased in time. Moreover, the seasonal variations of ground water quality criterions were determined and the precautions that should be taken to minimize this pollution were discussed