Doğal ve Modifiye Edilmiş Sepiyolit ile Sulu Çözeltilerden Arsenik ve Manganın Adsorpsiyonu ile Ayrımı

Doğal sepiyolit kil minerali Türkiye’nin Maden Tetkik ve Arama (MTA) kurumundan sağlanmış ve 2.5 M NaOH ile modifiye edilmiştir. Doğal (SP) ve modifiye edilmiş sepiyolit (Na-SP) örnekleri XRD, N2 adsorpsiyonu-desorpsiyonu, FTIR, SEM-EDS ve NH3-TPD ile karakterize edilmiştir. NaOH ile sepiyolitin modifikasyonu, sepiyolitin önemli miktarda desilikasyonuna ve dekatyonizasyonuna neden olmuştur. Sepiyolitin alkali muamelesi ile silisyum ve magnezyum çözünmesi sonucu sepiyolitin ortalama gözenek çapında artış ve yüzey alanında 187. 8 m2 g -1 ’den 7.1 m2g -1 ‘a azalma belirlenmiştir. Ayrıca, zayıf ve orta asit merkezleri azalırken, güçlü asit merkezleri artmıştır. SP ile maksimum As(III) ve As(V) ayrımı pH=1.5’de sağlanmış olup, değerler yaklaşık olarak sıra ile 8.9 mg g-1 ve 26.8 mg g-1 ’dır. Na-SP örneklerinde maksimum As(III) ve As(V) ayrımı pH=5.0’de sağlanmış olup, onların miktarı ise sıra ile 46.7 mg g-1 ve 35.9 mg g-1 ’dır. Doğal sepiyolitin maksimum Mn(II) uzaklaştırma miktarı ise 5.2 mg g-1 ’dır. Sepiyolitin NaOH ile modifikasyonu ile arsenik adsorpsiyon kapasitesi dört kata kadar artmış olup, bu değer demir içeren sepiyolit örnekleri ve bimetalik oksitler ile karşılaştırılabilirdir. Langmuir izotermleri SP ile As(V) ve NaSP ile As(III) ayrımı sonuçlarına uyumlu olmasına karşılık Freundlich izoterm modeli SP ile Mn(II) ve Na-SP ile As(V) uzaklaştırmasında uygunluk göstermiştir. Doğal ve modifiye edilmiş sepiyolit ile arsenik ve mangan adsorpsiyonu için kaydırılmış ikinci mertebeden kinetik model iyi uyum sağlamaktadır.

The Adsorptive Removal of Arsenic and Manganese from Aqueous Solution by Natural and Modified Sepiolite

The natural sepiolite clay mineral was obtained from General Directorate of Mineral Research and Exploration (MTA) of Turkey and modified with 2.5 M of NaOH. The natural (SP) and modified (Na-SP) sepiolite samples were characterized by XRD, N2 adsorption-desorption, FTIR, SEM-EDS and NH3-TPD. The treatment of the sepiolite with NaOH led to a significant desilication and decationization of the SP. The alkali treatment with NaOH caused solution of silicon and cations, resulting in an increase in its average pore diameter and a decrease in its surface area from 187. 8 m2 g -1 to 7.1 m2 g -1 . In addition, a number of weak and medium acid centres of SP was decreased while a number of strong acid centres was increased. The maximum As(III) and As(V) removal with the SP was achieved at an initial pH of 1.5, respectively; ca. 8.9 mg g-1and 26.8 mg g-1 . The maximum removal of As(III) and As(V) with Na-SP was achieved at an initial pH of 5.0; ca. 46.7 mg g-1 and 35.9 mg g-1 , respectively. The maximum Mn(II) removal with SP was 5.2 mg g-1 . Treatment of SP with NaOH increased its the arsenic adsorption capacity up to four times, which is comparable to iron-containing sepiolite samples and bimetallic oxides. While the Langmuir isotherm fitted well with results obtained from the As(V) with SP and As(III) with Na-SP, the Freundlich isotherm model was more appropriate for the results obtained from As(V) with Na-SP and from Mn(II) of SP. The pseudo-second-order kinetic model for the adsorption of arsenic and manganese on natural and modified sepiolite fitted well.

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