Highly efficient Ni(II) adsorption by industrial lignin-based biochar: a pivotal role of dissolved substances within biochar.

IF 5.8 3区 环境科学与生态学 0 ENVIRONMENTAL SCIENCES
Yanying He, Qianyi Deng, Liwen Cao, Cheng Luo, Wenjie Zhao, Honglin Tao, Long Chen, Yule Zhu, Jing Zhang, Xueying Mo, Baobin Mi, Fangfang Wu
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Abstract

In the context of carbon neutrality, promoting resource utilization of industrial alkali lignin addressing heavy metal pollution is crucial for China's pollution alleviation and carbon reduction. Microwave pyrolysis produced functionalized biochar from industrial alkali lignin for Ni(II) adsorption. LB400 achieved 343.15 mg g-1 saturated adsorption capacity in 30 min. Pseudo-second-order kinetic and Temkin isotherm models accurately described the adsorption, which was endothermic and spontaneous (ΔGϴ < 0, ΔHϴ > 0). Quantitative analysis revealed that both dissolved substances and carbon skeleton from biochar contributed to adsorption, with the former predominates (93.76%), including mineral precipitation NiCO3 (Qp) and adsorption of dissolved organic matter (QDOM). Surface complexation (Qc) and ion exchange (Qi) on the carbon skeleton accounted for 6.3%. Higher biochar preparation temperature reduced Ni(II) adsorption by dissolved substances. Overall, biochar which comes from the advantageous disposal of industrial lignin effectively removes Ni(II) contamination, encouraging ecologically sound treatment of heavy metal pollution and sustainable resource utilization.

Abstract Image

工业木质素生物炭对镍(II)的高效吸附:生物炭中溶解物质的关键作用。
在碳中和的大背景下,推动工业碱木素资源化利用,解决重金属污染问题,对中国的治污减碳工作至关重要。微波热解利用工业碱木素制备功能化生物炭,用于吸附镍(II)。LB400 在 30 分钟内达到 343.15 mg g-1 的饱和吸附容量。伪二阶动力学模型和 Temkin 等温线模型准确地描述了吸附过程,吸附过程是内热和自发的(ΔGϴ ϴ > 0)。定量分析显示,生物炭中的溶解物质和碳骨架都有助于吸附,其中前者占主导地位(93.76%),包括矿物沉淀 NiCO3(Qp)和溶解有机物的吸附(QDOM)。碳骨架上的表面络合(Qc)和离子交换(Qi)占 6.3%。生物炭制备温度越高,溶解物质对镍(II)的吸附越少。总之,利用工业木质素进行无害化处理的生物炭能有效去除镍(II)污染,促进重金属污染的生态无害化处理和资源的可持续利用。
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来源期刊
CiteScore
8.70
自引率
17.20%
发文量
6549
审稿时长
3.8 months
期刊介绍: Environmental Science and Pollution Research (ESPR) serves the international community in all areas of Environmental Science and related subjects with emphasis on chemical compounds. This includes: - Terrestrial Biology and Ecology - Aquatic Biology and Ecology - Atmospheric Chemistry - Environmental Microbiology/Biobased Energy Sources - Phytoremediation and Ecosystem Restoration - Environmental Analyses and Monitoring - Assessment of Risks and Interactions of Pollutants in the Environment - Conservation Biology and Sustainable Agriculture - Impact of Chemicals/Pollutants on Human and Animal Health It reports from a broad interdisciplinary outlook.
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