Reducing the migration of cadmium, lead and nickel in soil using rice straw-based humic acid modified bentonite.

IF 2.2 4区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES
Yaqi Ni, Jiasheng Zhang, Yanli Ma, Shixue Ren
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引用次数: 0

Abstract

With the continuous advancement of industrial development, the contamination of soil by potentially toxic element ions has emerged as an escalating issue, posing significant threats to both ecological systems and human health. Clay minerals have long been considered as green and economic remediation agents for polluted soil. However, their current application is hampered by low and inconsistent fixation efficiency. Here, a new clay composite BHA@B was prepared by modifying bentonite with biomass humic acid (BHA) prepared from rice straw. The BHA@B was characterized by FTIR, SEM and XRD and then tested as a remediation agent for potentially toxic element ion-contaminated soil. The effect of BHA@B on the prevalence of different fractions of Cd, Pb and Ni in soil and its ability to stabilize these metals were investigated using the BCR sequential extraction method. Treatment with BHA@B reduced the weak acid-extractable and reducible fractions of cadmium, lead and nickel by 22.5 and 8.1%, 17 and 11.4%, and 19.8 and 14%, respectively, compared with untreated soil. BHA@B transforms potentially toxic elements into oxidizable, residual, and other stable fractions, which greatly reduces the ability of potentially toxic element ions in the soil to migrate into the groundwater. BHA@B is a new, green, low-cost and efficient soil remediation agent.

水稻秸秆腐植酸改性膨润土减少土壤中镉、铅和镍的迁移。
随着工业发展的不断推进,潜在有毒元素离子对土壤的污染问题日益突出,对生态系统和人类健康都构成了重大威胁。粘土矿物一直被认为是一种绿色、经济的土壤修复剂。然而,它们目前的应用受到固定效率低和不一致的阻碍。以稻秆为原料,用生物质腐植酸(BHA)对膨润土进行改性,制备了新型粘土复合材料BHA@B。通过红外光谱(FTIR)、扫描电镜(SEM)和x射线衍射(XRD)对BHA@B进行了表征,并对其作为潜在有毒元素离子污染土壤的修复剂进行了测试。采用BCR序贯萃取法,研究了BHA@B对土壤中Cd、Pb、Ni不同组分含量的影响及其对这些金属的稳定作用。与未经处理的土壤相比,BHA@B处理的弱酸可提取和可还原部分镉、铅和镍分别降低了22.5%和8.1%,17%和11.4%,19.8%和14%。BHA@B将潜在的有毒元素转化为可氧化的、残留的和其他稳定的组分,这大大降低了土壤中潜在的有毒元素离子迁移到地下水中的能力。BHA@B是一种新型、绿色、低成本、高效的土壤修复剂。
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来源期刊
Environmental Technology
Environmental Technology 环境科学-环境科学
CiteScore
6.50
自引率
3.60%
发文量
0
审稿时长
4 months
期刊介绍: Environmental Technology is a leading journal for the rapid publication of science and technology papers on a wide range of topics in applied environmental studies, from environmental engineering to environmental biotechnology, the circular economy, municipal and industrial wastewater management, drinking-water treatment, air- and water-pollution control, solid-waste management, industrial hygiene and associated technologies. Environmental Technology is intended to provide rapid publication of new developments in environmental technology. The journal has an international readership with a broad scientific base. Contributions will be accepted from scientists and engineers in industry, government and universities. Accepted manuscripts are generally published within four months. Please note that Environmental Technology does not publish any review papers unless for a specified special issue which is decided by the Editor. Please do submit your review papers to our sister journal Environmental Technology Reviews at http://www.tandfonline.com/toc/tetr20/current
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