评估基于化学改性明胶和含氧化石墨烯纳米颗粒的 PVA 复合水凝胶对蓝藻和蓝藻毒素的去除效果

Grace Anne Vieira Magalhães-Ghiotto , Jean Paulo Silva Natal , Marcos Rogério Guilherme , Raquel Guttierres Gomes , Rosângela Bergamasco
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引用次数: 0

摘要

新合成的基于化学改性明胶和含石墨烯纳米颗粒的 PVA 复合水凝胶(CHGP-GOn)在应用于去除水中的药物后,又进行了另一项应用评估。水凝胶能够与铜绿微囊藻细胞相互作用,形成小的细胞集落,细胞裂解与暴露时间有关。在去除测试中,在自然 pH 值条件下,吸附剂质量最大的水凝胶对蓝藻细胞的去除率最高,细胞去除率达到 90%,叶绿素-a 去除率达到 75%,浊度和可见色去除率分别达到 63% 和 43%。动力学研究结果表明,细胞灭活在 19 小时内达到去除平衡,qe 为 106 × 106 个细胞/克 CHGP-GOn。此外,根据其他参数的测试结果,达到去除平衡的时间仅为 14 小时,每克吸附剂可去除 4670 微克/升的叶绿素-a 和 6450 微克/升/克的 MC-LR 微囊藻毒素。实验数据最符合埃洛维奇模型,表明可能是通过化学吸附去除的。对细胞完整性和形态的分析表明,在短短 12 小时内,少数蓝藻细胞出现膜破坏并释放出胞内毒素,毒性介质的增加与暴露时间的延长有关,在 24 小时内出现形态和表层细胞损伤。不过,在搅拌下进行的吸附测试中,该材料显示出良好的发展态势,没有任何材料脱落,也没有出现 GO 沥滤现象。因此,可以得出结论:合成的水凝胶可用于去除水处理中的铜绿微囊藻细胞及其毒素,是传统吸附剂的最佳替代品。
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Evaluation of the removal of cyanobacteria and cyanotoxins with a composite hydrogel based on chemically modified gelatin and PVA-containing graphene oxide nanoparticles

After being applied to pharmaceutics removal from water, the newly synthesized composite hydrogel based on chemically modified gelatin and PVA-containing graphene nanoparticles (CHGP-GOn), was now assessed for another application. The hydrogels were able to interact with Microcystis aeruginosa cells, resulting in the formation of small cell colonies and cell lysis related to exposure time. In the removal tests, the best general removal efficiency of cyanobacterial cells was achieved with the highest adsorbent mass at natural pH, achieving values of removal of 90 % for cells, 75 % chlorophyll-a, 63 % and 43 % for turbidity and visible colour removals, respectively. From the kinetic study, the results showed that cell inactivation has achieved removal equilibrium in 19 h, with a qe of 106 × 106 cells/g of CHGP-GOn. Furthermore, with the results from the other parameters, the tests presented a removal equilibrium of just 14 h, there was a removal of 4670 µg/L of Chlorophyll-a and 6450 µg/L/g of MC-LR microcystin per gram of adsorbent. The experimental data best fitted to the Elovich model, indicating possible removal by chemisorption. Analysis of cellular integrity and morphology showed that within just 12 h, few cyanobacterial cells showed membrane disruption and release of intracellular toxins, with an increase in the toxicity medium related to extended exposure time, and presentation of morphological and superficial cellular damage within 24 h. In addition, other characteristic measurements presented an exceptional mechanical strength and resistance that was slightly reduced after swelling. However, showing good development during adsorption tests under agitation, without any detachment of material and an absence of GO leaching. Therefore, it can be concluded that the synthesized hydrogel should be applied in removing M. aeruginosa cells and their toxins from water treatment, serving as an excellent alternative to traditional adsorbents.

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来源期刊
Environmental Nanotechnology, Monitoring and Management
Environmental Nanotechnology, Monitoring and Management Environmental Science-Water Science and Technology
CiteScore
13.00
自引率
0.00%
发文量
132
审稿时长
48 days
期刊介绍: Environmental Nanotechnology, Monitoring and Management is a journal devoted to the publication of peer reviewed original research on environmental nanotechnologies, monitoring studies and management for water, soil , waste and human health samples. Critical review articles, short communications and scientific policy briefs are also welcome. The journal will include all environmental matrices except air. Nanomaterials were suggested as efficient cost-effective and environmental friendly alternative to existing treatment materials, from the standpoints of both resource conservation and environmental remediation. The journal aims to receive papers in the field of nanotechnology covering; Developments of new nanosorbents for: •Groundwater, drinking water and wastewater treatment •Remediation of contaminated sites •Assessment of novel nanotechnologies including sustainability and life cycle implications Monitoring and Management papers should cover the fields of: •Novel analytical methods applied to environmental and health samples •Fate and transport of pollutants in the environment •Case studies covering environmental monitoring and public health •Water and soil prevention and legislation •Industrial and hazardous waste- legislation, characterisation, management practices, minimization, treatment and disposal •Environmental management and remediation
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