Innovation Center of Yangtze River Delta, Zhejiang University, Hangzhou, Zhejiang, China; Department of Environmental Science, Zhejiang University, Hangzhou, Zhejiang 310058, China.
Faculty of Sciences, Department of Botany, University of Gujrat, Gujrat-50700, Pakistan.
Environ Pollut. 2023 Dec 15;339:122644. doi: 10.1016/j.envpol.2023.122644. Epub 2023 Oct 10.
Anthropogenic-driven selenium (Se) contamination of natural waters has emerged as severe health and environmental concern. Lowering Se levels to safe limits of 40 μg-L (recommended by WHO) presents a critical challenge for the scientific community, necessitating reliable and effective methods for Se removal. The primary obectives of this review are to evaluate the efficiency of different biosorbents in removing Se, understand the mechanism of adsorption, and identify the factors influencing the biosorption process. A comprehensive literature review is conducted to analyze various studies that have explored the use of modified biochars, iron oxides, and other non-conventional biosorbents for selenium removal. The assessed biosorbents include biomass, microalgae-based, alginate compounds, peats, chitosan, and biochar/modified biochar-based adsorbents. Quantitative data from the selected studies analyzed Se adsorption capacities of biosorbents, were collected considering pH, temperature, and environmental conditions, while highlighting advantages and limitations. The role of iron impregnation in enhancing the biosorption efficiency is investigated, and the mechanisms of Se adsorption on these biosorbents at different pH levels are discussed. A critical literature assessment reveals a robust understanding of the current state of Se biosorption and the effectiveness of non-conventional biosorbents for Se removal, providing crucial information for further research and practical applications in water treatment processes. By understanding the strengths and limitations of various biosorbents, this review is expected to scale-up targeted research on Se removal, promoting the development of innovative and cost-effective adsorbents, efficient and sustainable approaches for Se removal from water.
人为驱动的硒（Se）污染自然水体已成为严重的健康和环境问题。将硒水平降低到 40μg/L（世界卫生组织推荐）的安全限值是科学界面临的一个关键挑战，需要可靠有效的方法来去除硒。本综述的主要目的是评估不同生物吸附剂去除硒的效率，了解吸附机制，并确定影响生物吸附过程的因素。通过综合文献回顾，分析了各种利用改性生物炭、氧化铁和其他非常规生物吸附剂去除硒的研究。评估的生物吸附剂包括生物质、微藻基、藻酸盐化合物、泥炭、壳聚糖和生物炭/改性生物炭基吸附剂。考虑到 pH 值、温度和环境条件，从选定的研究中收集了定量数据，以评估生物吸附剂对硒的吸附容量，同时突出了它们的优点和局限性。研究了铁浸渍在提高生物吸附效率方面的作用，并讨论了这些生物吸附剂在不同 pH 值下吸附硒的机制。对文献的批判性评估揭示了对当前硒生物吸附状态的深入了解，以及非常规生物吸附剂在去除硒方面的有效性，为进一步的研究和实际应用在水处理过程中提供了关键信息。通过了解各种生物吸附剂的优缺点，本综述有望针对硒去除进行有针对性的研究，促进开发具有创新性和成本效益的吸附剂，以及高效可持续的从水中去除硒的方法。
