Department of Applied Sciences, National Textile University, Faisalabad 37610, Pakistan; Department of Chemistry, University of Agriculture, Faisalabad 38000, Pakistan.
Department of Applied Sciences, National Textile University, Faisalabad 37610, Pakistan.
Int J Biol Macromol. 2021 Dec 1;192:1196-1216. doi: 10.1016/j.ijbiomac.2021.10.050. Epub 2021 Oct 14.
Globally, millions of people have no access to clean drinking water and are either striving for that or oppressed to intake polluted water. Arsenic is considered one of the most hazardous contaminants in water bodies that reaches there due to various natural and anthropogenic activities. Modified chitosan has gained much attention from researchers due to its potential for arsenic removal. This review focuses on the need and potential of chitosan-based biosorbents for arsenic removal from water systems. Chitosan is a low-cost, abundant, biodegradable biopolymer that possesses unique structural aspects and functional sites for the adsorption of contaminants like arsenic species from contaminated water. The chitosan-based biosorbents had also been modified using various techniques to enhance their arsenic removal efficiencies. This article reviews various forms of chitosan and parameters involved in chitosan modification which eventually affect the arsenic removal efficiency of the resultant sorbents. The literature revealed that the modified chitosan-based sorbents could express higher adsorption efficiency compared to those prepared from native chitosan. The sustainability of the chitosan-based sorbents has also been considered in terms of reusability. Finally, some recommendations have been underlined for further improvements in this domain.
在全球范围内，数百万人无法获得清洁饮用水，他们要么在努力争取，要么被迫摄入受污染的水。砷被认为是由于各种自然和人为活动而到达水体中的最危险污染物之一。由于其去除砷的潜力，改性壳聚糖引起了研究人员的极大关注。本综述重点介绍了基于壳聚糖的生物吸附剂从水系统中去除砷的必要性和潜力。壳聚糖是一种低成本、丰富、可生物降解的生物聚合物，具有独特的结构方面和功能位点，可从受污染的水中吸附砷等污染物。还使用各种技术对基于壳聚糖的生物吸附剂进行了改性，以提高其去除砷的效率。本文综述了各种形式的壳聚糖和壳聚糖改性中涉及的参数，这些参数最终会影响所得吸附剂去除砷的效率。文献表明，与天然壳聚糖制备的吸附剂相比，改性壳聚糖基吸附剂可以表达更高的吸附效率。还考虑了基于壳聚糖的吸附剂的可持续性，即从可重复使用的角度来看。最后，针对这一领域的进一步改进，提出了一些建议。
