Assessing the influence of natural zeolite on toxic heavy metals immobilization and their transfer into Zea mays L.

IF 1.3 4区化学 Q3 CHEMISTRY, MULTIDISCIPLINARY

Bulletin of the Chemical Society of Ethiopia Pub Date : 2023-09-19 DOI:10.4314/bcse.v37i6.5

Wubishet Legese, Abi M. Taddesse, Kibebew Kibret, Lemma Wogi

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Abstract

ABSTRACT. This research presents the efficiency of surfactant-modified (SMNZ) and unmodified natural-zeolite (UNZ) in the immobilization of Cr3+, Pb2+, and Cd2+ in the soil system. Phillipsite is identified as a major component of the host zeolite. Soil mixed with 20% UNZ retained the highest amount of all metals on the top layer of the soil-zeolite column. The lowest transfer of metals into the maize crop was observed at 30 mg of UNZ/kg soil. The experimental conditions such as pH, dose, stirring speed, contact time, and initial metal ions concentration showed significant effect on adsorption of Cr3+, Pb2+, and Cd2+ onto both unmodified and modified zeolite (phillipsite). The maximum adsorption (mg/kg) onto control soil, soil mixed with SMNZ and UNZ was 67.1, 90.9, 151.5 for Cr3+, 84.8, 120.5, 238.1 for Pb2+, 83.3, 116.3 and 212.8 for Cd2+ respectively. Thus, the use of natural zeolite, particularly UNZ has an important role in controlling the mobility of Cr3+, Pb2+, and Cd2+ metal ions in the soil system and thus their transfer to plant system. KEY WORDS: Zeolite, Immobilization, Heavy metals, Column, Pot trial, Batch Bull. Chem. Soc. Ethiop. 2023, 37(6), 1351-1368. DOI: https://dx.doi.org/10.4314/bcse.v37i6.5

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评价天然沸石对玉米中有毒重金属的固定化及其转移的影响。

摘要研究了表面活性剂改性(SMNZ)和未改性天然沸石(UNZ)对土壤系统中Cr3+、Pb2+和Cd2+的固定化效果。Phillipsite被确定为宿主沸石的主要成分。混合20% UNZ的土壤在土壤-沸石柱的顶层保留了最高的所有金属含量。在30 mg /kg土壤中观察到金属向玉米作物的转移最低。pH、用量、搅拌速度、接触时间、初始金属离子浓度等实验条件对改性沸石(phillipsite)和未改性沸石(phillipsite)对Cr3+、Pb2+和Cd2+的吸附均有显著影响。对照土壤、SMNZ和UNZ混合土壤对Cr3+的最大吸附量(mg/kg)分别为67.1、90.9、151.5、84.8、120.5、238.1、83.3、116.3和212.8。因此，利用天然沸石，特别是UNZ，对控制土壤系统中Cr3+、Pb2+和Cd2+金属离子的迁移，从而向植物系统转移具有重要作用。关键词:沸石;固定化;重金属;公牛。化学。Soc。中国生物医学工程学报，2016,37(6):1351-1368。DOI: https://dx.doi.org/10.4314/bcse.v37i6.5

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来源期刊

Bulletin of the Chemical Society of Ethiopia 化学-化学综合

CiteScore

2.20

自引率

8.30%

发文量

113

审稿时长

6-12 weeks

期刊介绍： The Bulletin of the Chemical Society of Ethiopia (BCSE) is a triannual publication of the Chemical Society of Ethiopia. The BCSE is an open access and peer reviewed journal. The BCSE invites contributions in any field of basic and applied chemistry.