“Chacco” clay from the Peruvian highlands as a potential adsorbent of heavy metals in water

IF 8 Q1 ENERGY & FUELS Energy nexus Pub Date : 2024-10-22 DOI:10.1016/j.nexus.2024.100330
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Abstract

This research aimed to remove Cd (II), Cr (VI), Ni (II), Pb (II), and V (V) from aqueous solutions prepared in distilled water using “Chacco” clay from the Peruvian highlands as adsorbent. The adsorption process was carried out in Batch type systems for 120 min using solutions of each metal at a concentration of 5 mg/L in aqueous systems of a single metal or monometallic (MAS) and solutions of the five metals simultaneously or multimetallic (MMAS). For this purpose, the “Chacco” clay was first characterized by SEM-EDS analysis, finding a laminated clay structure with an elemental composition of C, Al, Fe, Na, Mg, Ca, K, As, Cu, Pd, O, and Ta. The results using 10 g/L of “Chacco” clay showed that the best adsorption efficiency in both MAS and MMAS aqueous systems is achieved at pH = 4 achieving in MAS aqueous systems the removal of 64.16 ± 0.98 % of Cd (II), 95.70 ± 0.81 % of Cr (VI), 97.20 ± 0.89 % of Ni (II), 92. 78 ± 0.79 % of Pb (II), and 95.80 ± 0.67 % of V (V), on the other hand, in aqueous MMAS systems a decrease in adsorption efficiency was observed, managing to remove 6.88 ± 0.53 % of Cd (II), 63.04 ± 0.94 of Cr (VI), 7.81 ± 0.43 % of Ni (II), 62.34 ± 0.77 % Pb (II), and 14.33 ± 0.56 % of V (V). The kinetic study showed that the adsorption mechanism would correspond to chemisorption since the process fitted best to the pseudo-second order model and Elovich. SEM-EDS analysis after adsorption confirmed the presence of the heavy metals under study in the “Chacco” clay. Metal adsorption is evidenced at 1418 cm−1 by -CH2-metal deformation vibrations according to FTIR analysis. In conclusion, the “Chacco” clay would be a promising adsorbent of heavy metals in polluted waters so that scaling up to real environments could be feasible. On the other hand, the “Chacco” clay is consumed by the population of Puno, Peru, therefore its potential impact on health should be evaluated due to its capacity to accumulate metals and the presence of Al in this clay.
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秘鲁高原的 "Chacco "粘土作为水中重金属的潜在吸附剂
本研究旨在使用秘鲁高原的 "Chacco "粘土作为吸附剂,去除蒸馏水水溶液中的镉 (II)、铬 (VI)、镍 (II)、铅 (II) 和钒 (V)。吸附过程在间歇式系统中进行,时间为 120 分钟,在水溶液系统中使用浓度为 5 毫克/升的每种金属溶液,包括单一金属或单金属(MAS)溶液和五种金属同时存在的溶液或多金属(MMAS)溶液。为此,首先通过 SEM-EDS 分析对 "Chacco "粘土进行了表征,发现其具有层状粘土结构,元素组成包括 C、Al、Fe、Na、Mg、Ca、K、As、Cu、Pd、O 和 Ta。使用 10 克/升 "Chacco "粘土的研究结果表明,在 MAS 和 MMAS 水系统中,pH = 4 时的吸附效率最高,在 MAS 水系统中,镉(II)的去除率为 64.16 ± 0.98%,铬(VI)的去除率为 95.70 ± 0.81%,镍(II)的去除率为 97.20 ± 0.89%,钯(VI)的去除率为 92.78 ± 0.79%。78 ± 0.79 % 的铅(II)和 95.80 ± 0.67 % 的Ⅴ(V);另一方面,在水性 MMAS 系统中,吸附效率有所下降,只能去除 6.88 ± 0.53 % 的镉(II)、63.04 ± 0.94 % 的铬(VI)、7.81 ± 0.43 % 的镍(II)、62.34 ± 0.77 % 的铅(II)和 14.33 ± 0.56 % 的Ⅴ(V)。动力学研究表明,由于吸附过程最符合伪二阶模型和埃洛维奇模型,因此吸附机理与化学吸附相对应。吸附后的 SEM-EDS 分析证实了 "Chacco "粘土中存在所研究的重金属。根据傅立叶变换红外分析,在 1418 cm-1 处的-CH2-金属变形振动证明了金属吸附。总之,"Chacco "粘土有望成为污染水体中重金属的吸附剂,因此将其推广到实际环境中是可行的。另一方面,秘鲁普诺的居民食用 "Chacco "粘土,因此应评估其对健康的潜在影响,因为这种粘土具有积累金属的能力,而且还含有铝。
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来源期刊
Energy nexus
Energy nexus Energy (General), Ecological Modelling, Renewable Energy, Sustainability and the Environment, Water Science and Technology, Agricultural and Biological Sciences (General)
CiteScore
7.70
自引率
0.00%
发文量
0
审稿时长
109 days
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