Biosorption of Cu2+ from synthetic wastewater by tea waste sorbent: kinetics, equilibrium and thermodynamics

The biosorption of Cu2+ onto the tea wastes (TW) was investigated by performing the batch experiments. The removal efficiency and biosorption capacity (qe) of TW was investigated as a function of pH, contact time, initial Cu2+ concentration, temperature, and TW dose. The qe value of TW increased with the increase of solution temperatures. According to the R2 value, qexp and qcal, the adsorption equilibrium was well described by the Langmuir isotherm model. The highest sorption of Cu2+ onto TW was observed at the initial pH value and temperature of 6.0 and 55°C, respectively. Experimental results confirming that the biosorption reaction of Cu2+ on the TW was thought to be endothermic. By the comparison of kinetic models, results demonstrated that the system was best described by the pseudo second-order kinetic model. The negative ΔG˚ value indicated that the Cu2+sorption onto the TW is feasible.

Sentetik atýksulardan atýk çay sorbentine Cu+2 biyosorpsiyonu: kinetikler, eþitlikler ve termodinamik

Cu2+’nin atýk çaya (AÇ) biyosorpsiyonu kesikli deneyler ile araþtýrýlmýþtýr. AÇ’nin giderme verimi ve biyosorpsiyon kapasitesi (qe), pH, temas süresi, baþlangýç Cu+2 deriþimi, sýcaklýk ve AÇ dozuna göre araþtýrýlmýþtýr. AÇ’ýn qe deðeri, çözelti sýcaklýðý arttýkça yükselmiþtir. Deneysel çalýþmalar ile elde edilen R2, qden ve qhes deðerlerine göre adsorpsiyon eþitliði en iyi, Langmuir izoterm modeli ile tanýmlanmaktadýr. AÇ’ye en yüksek Cu+2 biyosorpsiyonu, baþlangýç pH ve sýcaklýðý olan 6.0 ve 55 0C’de olduðu belirlenmiþtir. Deneysel sonuçlar, AÇ’ye, Cu+2 biyosorpsiyonunun endotermik bir reaksiyon olduðunu göstermektedir. Kinetik modeller karþýlaþtýrýldýðýnda biyosorpsiyon en iyi yalancý II. derece kinetik model tarafýndan tanýmlanmaktadýr. Negatif ΔG˚ deðeri AÇ’ye Cu+2 biyosorpsiyonunun uygulanabilir olduðunu göstermektedir.