Carbohydrate Polymers ( IF 11.2 ) Pub Date : 2021-09-16 , DOI: 10.1016/j.carbpol.2021.118671 Abdelazeem S Eltaweil 1 , Ahmed M Omer 2 , Hisham G El-Aqapa 1 , Nourhan Mohamed Gaber 3 , Nour F Attia 4 , Gehan M El-Subruiti 1 , Mohamed S Mohy-Eldin 2 , Eman M Abd El-Monaem 1
The tremendous development in the industrial sector leads to discharging of the several types of effluents containing detrimental contaminants into water sources. Lately, the proliferation of toxic anions particularly phosphates and nitrates onto aquatic systems certainly depreciates the ecological system and causes a deadly serious problem. Chitosan (Cs) is one of the most auspicious biopolymer adsorbents that are being daily developed for removing of various contaminants from polluted water. This is due to its unparalleled benefits involving biocompatibility, non-toxicity, facile modifications and low-cost production. Nevertheless, chitosan displays considerable drawbacks including low adsorption capacity, low surface area and lack of reusability. Therefore, few findings have been established regarding the aptitude of modified chitosan-based adsorbents towards phosphate and nitrate anions. This review elaborates an overview for the current advances of modified chitosan based-adsorbent for phosphate and nitrate removal, in specific multivalent metals-modified chitosan, clays and zeolite-modified chitosan, magnetic chitosan and carbon materials-modified chitosan. The efforts that have been executed for enriching their adsorption characteristics as well as their possible adsorption mechanisms and reusability were well addressed. Besides, the research conclusions for the optimum adsorption conditions were also discussed, along with emphasizing the foremost research gaps and future potential trends that could motivate further research and innovation to find best solutions for water treatment problems facing the world.
中文翻译:
用于去除磷酸盐和硝酸盐的壳聚糖基吸附剂:批判性审查
工业部门的巨大发展导致含有有害污染物的几种类型的污水排放到水源中。最近,有毒阴离子特别是磷酸盐和硝酸盐向水生系统扩散,肯定会破坏生态系统并导致致命的严重问题。壳聚糖 (Cs) 是最吉祥的生物聚合物吸附剂之一,每天都在开发用于去除污水中的各种污染物。这是由于其无与伦比的优势,包括生物相容性、无毒、易于修改和低成本生产。然而,壳聚糖显示出相当大的缺点,包括低吸附能力、低表面积和缺乏可重复使用性。所以,关于改性壳聚糖基吸附剂对磷酸盐和硝酸根阴离子的适应性的研究结果很少。本文综述了基于改性壳聚糖的吸附剂去除磷酸盐和硝酸盐的最新进展,具体包括多价金属改性壳聚糖、粘土和沸石改性壳聚糖、磁性壳聚糖和碳材料改性壳聚糖。为丰富其吸附特性以及可能的吸附机制和可重用性而进行的努力得到了很好的解决。此外,还讨论了最佳吸附条件的研究结论,