MIL-53(Al) ve çok duvarlı karbon nanotüp kullanılarak sulu çözeltiden Cu(II), Ni(II), Pb(II) ve Zn(II) iyonlarının eş zamanlı olarak giderilmesi

Abstract

Endüstriyel atık sulardaki ağır metaller hem çevre hem de insan sağlığı için ciddi bir tehdit oluşturmaktadır. Özellikle madencilikte deşarj edilen su genellikle asidiktir ve kurşun, bakır, çinko ve nikel gibi tehlikeli metal iyonları içerir. Bu çalışmada, bu iyonların sulu çözeltiden eş zamanlı olarak uzaklaştırılması için metal organik çerçeve (MIL-53(Al)) ve çok duvarlı karbon nanotüp (MWCNT) adsorbanları kullanılmıştır. Temel işlem değişkenleri olan adsorban dozu, pH, başlangıç metal konsantrasyonu ve temas süresinin etkileri sistematik olarak incelenmiştir. MIL-53(Al) ve MWCNT üzerinde eş zamanlı çoklu metal uzaklaştırma işleminde adsorpsiyon öncesi ve sonrası adsorbanların fizikokimyasal karakterizasyonu, Fourier dönüşümlü kızılötesi spektroskopisi (FTIR), X-ışını kırınımı (XRD) ve taramalı elektron mikroskobu (SEM) ile değerlendirilmiştir. Ek olarak, MIL-53(Al) ve MWCNT için zeta potansiyel değerleri sırasıyla +14,6 ve -31,8 olarak belirlenmiş olup, bu değerler pH'ın süreç üzerindeki etkisini açıklamak için kullanılmıştır. Eş zamanlı çoklu metal adsorpsiyonunda MWCNT'ler kullanılarak Cu(II), Ni(II), Pb(II) ve Zn(II) için Langmuir maksimum adsorpsiyon kapasiteleri sırasıyla 5,32, 16,05, 14,01 ve 7,07 mg/g olarak bulunmuştur. Bununla birlikte, MIL-53(Al) için MWCNT'ye kıyasla daha düşük adsorpsiyon kapasiteleri elde edilmiştir. Her iki süreçte de, birlikte bulunan metal iyonları arasındaki rekabetçi adsorpsiyon ve elektrostatik itme, adsorpsiyon verimliliğini olumsuz etkilemiştir.

Keywords

• MIL-53(Al)
• Karbon nanotüp
• Ağır metal
• Yarışmalı adsorpsiyon
• Kirlilik

Simultaneous removal of Cu(II), Ni(II), Pb(II), and Zn(II) ions from aqueous solution using MIL-53(Al) and multi-walled carbon nanotube

Abstract

Heavy metals in industrial wastewater pose a severe threat to both environmental and human health. The discharged water, particularly in mining, is often acidic and contains hazardous metal ions such as lead, copper, zinc, and nickel. In this study, a metal organic framework (MIL-53(Al)) and multi-walled carbon nanotube (MWCNT) adsorbents were employed for the simultaneous removal of these ions from aqueous solution. The effects of key process variables, adsorbent dosage, pH, initial metal concentration, and contact time were systematically examined. The physicochemical characterization of the adsorbents before and after adsorption in the simultaneous multi-metal removal on MIL-53(Al) and MWCNT was evaluated by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and scanning electron microscope (SEM). Additionally, the zeta potential values for MIL-53(Al) and MWCNT were determined as +14.6 and -31.8, respectively, which were used to explain the effect of pH on the process. Langmuir maximum adsorption capacities for Cu(II), Ni(II), Pb(II), and Zn(II) using MWCNTs in the simultaneous multi-metal adsorption were 5.32, 16.05, 14.01, and 7.07 mg/g, respectively. However, lower adsorption capacities were obtained for MIL-53(Al) compared to MWCNT. In both processes, competitive adsorption and electrostatic repulsion between coexisting metal ions negatively affected the adsorption efficiency.

Keywords

• MIL-53(Al)
• Carbon nanotubes
• Heavy metals
• Competitive adsorption
• Pollution

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