Insight on an Eco-Friendly Flocculation Using Cactus Extracts: Synthetic Dye and Heavy Metals Removal

IF 0.5 4区 化学 Q4 CHEMISTRY, ANALYTICAL
Bouthaina Othmani,  Moncef Khadhraoui
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引用次数: 0

Abstract

Over these last years, there is no doubt that the conventional chemical flocculants commonly used for wastewater treatment have been a source of serious human health threats and environmental damage. Consequently, safe and eco-friendly substitutes are worth looking for and assessing. Within this line, flocculants derived from cactus namely, cladodes juice (CJ), powders of lyophilized (CLP) and oven-dried (CDP) cladodes, were developed as alternatives to the noxious synthetic ones. The flocculating activity of these three extracts was evaluated in treating a synthetic Disperse Blue-1 (DB-1) dye solution and a real industrial effluent loaded with heavy metals. A prominent DB-1 removal of up to 80% was achieved using CJ, CLP and CDP. Significant colour and turbidity reductions (94%) were attained using only 20 mg/L of CLP. Likewise, the cactus bio-flocculants complementing alum as a coagulant ensured an enhanced Zn removal from the industrial wastewater. For instance, both CLP and CDP allowed salient Zn uptake exceeding 99% against 69% using the CJ formula. The slight disparity in the flocculating activity between these three formulations could be ascribed to their preparation procedures affecting the integrity of their active agents (polysaccharides and chiefly polygalacturonic acid). Further, it is thought that the presence of hydroxyl (–OH) and carboxyl (–COOH) groups on this latter’s backbone confers the cactus extracts a notable flocculating ability regardless of the type of water pollutants. The plausible flocculation mechanisms for DB-1 molecules and Zn removal are assumed to be adsorption-bridging and adsorption-charge neutralization, respectively.

Abstract Image

利用仙人掌提取物进行生态友好型絮凝的启示:去除合成染料和重金属
毫无疑问,在过去几年中,用于废水处理的传统化学絮凝剂已成为严重威胁人类健康和破坏环境的根源。因此,安全、环保的替代品值得寻找和评估。在这一思路下,从仙人掌中提取的絮凝剂,即仙人掌果汁(CJ)、冻干仙人掌粉末(CLP)和烘干仙人掌粉末(CDP)被开发出来,作为有毒合成絮凝剂的替代品。在处理合成分散蓝-1(DB-1)染料溶液和含有重金属的实际工业废水时,对这三种提取物的絮凝活性进行了评估。CJ、CLP 和 CDP 对 DB-1 的去除率高达 80%。仅使用 20 毫克/升的 CLP 就能显著降低色度和浊度(94%)。同样,仙人掌生物絮凝剂与作为混凝剂的明矾相辅相成,确保了工业废水中锌去除率的提高。例如,CLP 和 CDP 对锌的吸收率均超过 99%,而 CJ 配方的吸收率仅为 69%。这三种配方的絮凝活性略有不同,可能是由于它们的制备过程影响了活性剂(多糖,主要是聚半乳糖醛酸)的完整性。此外,人们还认为,聚半乳糖醛酸骨架上羟基(-OH)和羧基(-COOH)的存在赋予了仙人掌提取物显著的絮凝能力,而与水污染物的类型无关。假设 DB-1 分子和锌去除的絮凝机制分别是吸附架桥和吸附电荷中和。
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来源期刊
Journal of Water Chemistry and Technology
Journal of Water Chemistry and Technology CHEMISTRY, APPLIED-CHEMISTRY, ANALYTICAL
自引率
0.00%
发文量
51
审稿时长
>12 weeks
期刊介绍: Journal of Water Chemistry and Technology focuses on water and wastewater treatment, water pollution monitoring, water purification, and similar topics. The journal publishes original scientific theoretical and experimental articles in the following sections: new developments in the science of water; theoretical principles of water treatment and technology; physical chemistry of water treatment processes; analytical water chemistry; analysis of natural and waste waters; water treatment technology and demineralization of water; biological methods of water treatment; and also solicited critical reviews summarizing the latest findings. The journal welcomes manuscripts from all countries in the English or Ukrainian language. All manuscripts are peer-reviewed.
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