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

Year 2019, Volume: 7 Issue: 1, 127 - 139, 15.01.2019

Ayten Ateş , Gökhan Yaşar

https://doi.org/10.21541/apjes.413488

Cited By: 1

Abstract

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^-1  and 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.

Keywords

Sepiolite, manganese, arsenic, adsorption, tretament with NaOH

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

Abstract

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 Na-SP 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. 

Keywords

Sepiyolit, mangan, arsenik, adsorpsiyon, NaOH ile muamele

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