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Kemoterapide en çok reçete edilen aktif maddelerden biri olan ve atık su arıtma tesisi sahasında yaygın olarak bulunan 5-Florourasilin (5-FLU) adsorpsiyonu, kağıt çamuru ile buğday kabuklarından üretilen biyokömürle ultrasonik ortamda gerçekleştirilmiştir. Adsorbent olarak kullanılan biyokömür, SEM, EDX, BET, FT-IR ve XRF analizleri ile karakterize edilmiştir. Yanıt yüzey modellemesi ve Box-Behnken tasarımı kullanılarak optimum koşullar ile 5-FLU konsantrasyonu, adsorpsiyon zamanı ve adsorbent miktarı parametrelerinin etkileri araştırılmıştır. Adsorbent miktarı en etkili parametre olarak belirtilirken, optimum adsorpsiyon koşulları: konsantrasyon = 5,48 mg/L, adsorbent miktarı = 1,61 g, zaman = 39,61 dakika olarak tahmin edilmiş ve bu şartlarda % 95,99 oranında adsorpsiyon gerçekleşeceği belirlenmiştir. Langmuir izoterm modeli deneysel veriler için daha iyi bir uyum (R2 = 0,999) göstermiş ve maksimum adsorpsiyon kapasitesi (qmax), Langmuir izotermiyle gösterildiği gibi 5,75 mg/g olarak bulunmuştur. Kinetik olarak adsorpsiyon işlemi, kemisorpsiyonun hız sınırlayıcı adım olduğunu gösteren pseudo birinci derece model olarak belirlenmiştir., The adsorption of 5-Fluorouracil (5-FLU), one of the most prescribed active substances in chemotherapy and commonly found in wastewater treatment plant area, was achieved in ultrasonic medium on biochar produced from paper sludge and wheat husks. Biochar used as adsorbent was characterized by SEM, EDX, BET, FT-IR and XRF analyses. By using response surface modeling and Box-Behnken design, the optimum conditions and effects of 5-FLU concentration, adsorption time and adsorbent dosage parameters were investigated. The adsorbent was stated the most influential factor whereas the optimum adsorption conditions were predicted as: concentration = 5.48 mg/L, adsorbent dosage = 1.61g, adsorption time = 39.61 min, and was determined that adsorption would occur at a rate of 95.99% at these conditions. The Langmuir isotherm model provided a better fit (R2=0.999) for the experimental data and that maximum adsorption capacity (qmax) was found 5.75 mg/g as indicated by the Langmuir isotherm. Kinetically, the adsorption process determined a pseudo-first order model, indicating that chemisorption was the rate-limiting step.

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.