POTENTIAL USE OF HAZELNUT PROCESSING PLANT WASTES AS A SORBENT FOR THE SIMULTANEOUS REMOVAL OF MULTI-ELEMENTS FROM WATER

Yıl 2019, Cilt: 7 Sayı: 2, 301 - 312, 26.06.2019

Özlem Tunç Dede

https://doi.org/10.21923/jesd.486065

Cited By: 7

Öz

In this paper, the effects
of pH (1.5-8.0), initial element concentration (0.5 to 20 mg L⁻¹.) and sorbent dosage (1 - 20 g L^-1) were investigated on the potential use of hazelnut processing plant
wastes, hazelnut shell (SH) and hazelnut skin (SK), for the simultaneous
removal of Al, Cr, Cu, Cd, Pb, As and Fe from water. The surface morphology of
the sorbents, elemental analysis, FTIR, SEM-EDS and BET analysis were performed
and specific surface areas of the sorbents were found as 0.676 m² g^-1
(for SH) and 0.768 m² g^-1 (for SK). The results showed
that surfaces of both sorbents are rough, contains pores that allow to entrap
heavy metals and functional groups such as carboxylic acid, phenolic compounds,
etc. to which the heavy metal ions can attach. While the optimum pH was
determined as 5.0 for all elements in both sorbent systems, the percent removal
of heavy metal increased with increase in initial heavy metal concentration up
to 8 mg L^-1 (except cadmium for SH and copper and cadmium for SK).
While optimum sorbent dosage was obtained 10 g L^-1 for SH sorbent,
increase of sorbent amount led to a decrease of the percentage of removal for
SK. Adsorption models were used for the mathematical description of adsorption
equilibrium and isotherm constants were evaluated at room temperature (22 ± 2 ◦C). The adsorption
equilibrium data were fitted well to Langmuir and Langmuir-Freundlich models in
most cases and showed favorable adsorption behavior

Anahtar Kelimeler

Adsorption/biosorption, Agricultural waste, Natural adsorbent, Water treatment

SULARDAN ÇOKLU-ELEMENT GİDERİMİNDE FINDIK İŞLEME TESİSLERİ ATIKLARININ SORBENT OLARAK KULLANIMI

Öz

Bu çalışmada; Al, Cr, Cu, Cd, Pb, As ve Fe'in
sudan eş zamanlı olarak uzaklaştırılmasında fındık işleme tesisi atıklarından,
fındık kabuğu (SH) ve fındık zarının (SK) potansiyel kullanımına, ortam pH’ı
(1.5 - 8.0), başlangıç element derişimi (0.5-20 mg L⁻¹)
ve sorbent dozunun (1 - 20 g L^-1) etkileri araştırılmıştır. Sorbentlerin yüzey morfolojisi, elementel analizi, FTIR, SEM-EDS
ve BET analizleri yapılmış ve özgül yüzey alanları 0.676 m² g^-1
(SH için) ve 0.768 m² g^-1 (SK için) olarak bulunmuştur.
Sonuçlar, her iki sorbent yüzeyinin pürüzlü, ağır metalleri tutabileceği
gözenekler ve karboksilik asit, fenol bileşikleri gibi fonksiyonel gruplar
içerdiğini göstermiştir. Her iki sorbent sisteminde tüm elementler için optimum
pH, 5.0 olarak belirlenirken, başlangıç metal derişiminin 8 mg L^-1’e kadar artması ile birlikte element giderim yüzdesinin (SH için
kadmiyum, SK için ise bakır ve kadmiyum hariç) arttığı bulunmuştur. Optimum sorbent dozu, SH için
10 g L^-1 olarak bulunurken, SK için sorbent miktarının artması ile
giderim yüzdesi azalmıştır. Adsorpsiyon dengesinin
matematiksel modellemesi için adsorpsiyon modelleri kullanılmış ve izoterm
sabitleri oda sıcaklığında (22 ± 2 ◦C) hesaplanmıştır. Çoğu
durumda adsorpsiyon denge verileri, Langmuir ve Langmuir-Freundlich modellerine
uyum sağlamış ve istemli-adsorpsiyon davranışları göstermiştir.

Anahtar Kelimeler

Adsorpsiyon/biyosorpsiyon, Tarımsal atık, Doğal adsorbent, Su arıtımı

Kaynakça

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