Removal of As(III) and As(V) from water by chitosan and chitosan derivatives: a review

Abstract

As arsenic removal becomes a global concern, the development of removal processes for arsenic treatment is still a major challenge. With regard to environmental compatibility and cheapness, chitosan and chitosan derivatives are considered as a promising removal technology for arsenic. Chitosan and chitosan derivatives possess the properties of low cost and good sorption on the arsenic removal. The present review is concerned about the present understanding of the mechanisms involved in sorption processes. Further on, detailed discussions are given of the effects of various factors on the performance of chitosan and chitosan derivatives in arsenic treatment processes. Finally, special attention is paid to the future challenges of chitosan and chitosan derivatives utilized for industrial arsenic treatment.

Chitin Adsorbents for Toxic Metals: A Review

“…Another important point of the present review article is that until now, no other review/overview/summary was published regarding the removal of heavy metals with adsorption onto chitin derivatives. Numerous researchers have published review articles on topics such as the preparation and application of chitosan adsorbents (grafted, cross-linked and generally modified) for the removal of various pollutants [ 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 ]. Chitosan is considered to be more “flexible” from a structural point of view due to its amino groups (making it easy to modify) ( Figure 1 a).…”

Capacidad quelatante del quitosano sobre el arsénico soluble en dos fluvisoles de una zona árida de México

“…En este sentido, al considerar el pH de la solución del suelo dónde se encontraban el As soluble y la presencia de un agente con pH ácido del quitosano, el As se adsorbió a este polisacárido, razón por la cual disminuyo la concentración del ion en los suelos. Este comportamiento puede explicarse porque la fracción de grupos amino protonados se incrementa a pH ácido, por lo que aumenta la af inidad por los aniones arseniatos (Dambies et al, 2002), como lo reaf irmó Wang et al (2016) al reportar que la ef iciencia del quitosano se incrementa a un pH de 5.5.…”

Modifiye Edilmiş Pomza Kullanılarak Sulu Ortamlardan Adsorpsiyon Prosesi ile Arsenat (V) Giderimi

“…Kaplamada Lai vd (2000) [12] ve Lai ve Chen (2001) [13] tarafından belirtilen metot bazı modifikasyonlar yapılarak kullanılmıştır [14]. Pomza önce 1 M HCl asit çözeltisinde pH 1'de oda sıcaklığında 24…”

“…Adsorpsiyon verimindeki bu azalmanın bazik bölgeye gidildikçe çözeltide mevcut OHiyonlarının konsantrasyonunun artışından kaynaklandığı düşünülmektedir. Literatürde pH 3,0 ve 4,0'te en yüksek As(V) adsorpsiyon verimlerinin gözlendiği çalışmalar mevcuttur [20,21,22,23,24]. Şekil 5'de görüldüğü gibi HIP ve DOKIP sorbentleri ile As(V) adsorpsiyonunun maksimum gerçekleştiği optimum pH değerleri sırasıyla 4,0 ve 3,0 olarak belirlenmiş ve diğer parametrelerin incelenmesinde bu değer dikkate alınmıştır.…”