Design and Fabrication of Co([CHITOSAN-AMPS-AA]/PEI-MBA) Nanocomposite Hydrogel as an Effective Solution for Removing Tin and Platinum Ions in Wastewater Treatment Applications: Selective Recovery of Platinum

IF 4.7 3区 工程技术 Q2 ENGINEERING, ENVIRONMENTAL
Farnoosh Khademi, Mahsa Baghban Salehi, Hamid Reza Mortaheb, Ali Asghar Nozaeim, Seyyed Hamid Ahmadi
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Abstract

A nanocomposite hydrogel Co([CHITOSAN-AMPS-AA]/PEI-MBA) was synthesized using silica and graphene oxide nanoparticles by a free radical polymerization method. The hydrogel was used to adsorb tin and platinum from wastewater produced during production of a commercial dehydrogenation process. The adsorbed platinum could be selectively released from the adsorbing hydrogel platinum. Various tests including FTIR, XRD, TGA, and Rheology were conducted to identify the hydrogel’s three-dimensional structure. The adsorption performance was evaluated using ICP, SEM, and EDS tests. The ability of hydrogel for multiple adsorptions was also assessed. The thermodynamical study and adsorption isotherms were investigated, and the possible structure of the synthesized adsorbing hydrogel was presented. The results showed that while the hydrogel could adsorb platinum physically in three consecutive cycles from wastewater, tin is chemically adsorbed during the process. The physically-adsorbed platinum could then be released selective. The adsorption isotherm of platinum and tin ions followed the Langmuir adsorption isotherm model while the adsorption rate represented a pseudo-first-order kinetic model. The hydrogel had an adsorption capacity of 263.16 mg/g for platinum and 188.88 mg/g for tin with the Gibbs free energy of − 1710.86 J/mol and − 4521.08 J/mol, respectively. It was found that the hydrogel can be reused for practical and large-scale wastewater treatment as less than 10% decrease in the adsorption capacity was observed after three consecutive adsorption–desorption cycles.

Abstract Image

Abstract Image

设计和制备 Co([CHITOSAN-AMPS-AA]/PEI-MBA)纳米复合水凝胶,作为废水处理应用中去除锡和铂离子的有效解决方案:铂的选择性回收
利用自由基聚合法,使用二氧化硅和氧化石墨烯纳米颗粒合成了一种纳米复合水凝胶 Co([CHITOSAN-AMPS-AA]/PEI-MBA)。该水凝胶用于吸附商业脱氢工艺生产过程中产生的废水中的锡和铂。被吸附的铂可选择性地从吸附水凝胶铂中释放出来。为了确定水凝胶的三维结构,进行了各种测试,包括傅立叶变换红外光谱(FTIR)、X射线衍射(XRD)、热重分析(TGA)和流变学(Rheology)。使用 ICP、SEM 和 EDS 测试评估了吸附性能。此外,还评估了水凝胶的多重吸附能力。研究了热力学研究和吸附等温线,并提出了合成吸附水凝胶的可能结构。结果表明,水凝胶可在连续三个周期内从废水中物理吸附铂,但在此过程中锡会被化学吸附。物理吸附的铂金可以选择性地释放出来。铂和锡离子的吸附等温线遵循朗缪尔吸附等温线模型,而吸附速率则代表伪一阶动力学模型。水凝胶对铂和锡的吸附容量分别为 263.16 毫克/克和 188.88 毫克/克,吉布斯自由能分别为-1710.86 焦耳/摩尔和-4521.08 焦耳/摩尔。研究发现,该水凝胶可重复用于实际的大规模废水处理,因为在连续三次吸附-解吸循环后,吸附容量的下降幅度小于 10%。
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来源期刊
Journal of Polymers and the Environment
Journal of Polymers and the Environment 工程技术-高分子科学
CiteScore
9.50
自引率
7.50%
发文量
297
审稿时长
9 months
期刊介绍: The Journal of Polymers and the Environment fills the need for an international forum in this diverse and rapidly expanding field. The journal serves a crucial role for the publication of information from a wide range of disciplines and is a central outlet for the publication of high-quality peer-reviewed original papers, review articles and short communications. The journal is intentionally interdisciplinary in regard to contributions and covers the following subjects - polymers, environmentally degradable polymers, and degradation pathways: biological, photochemical, oxidative and hydrolytic; new environmental materials: derived by chemical and biosynthetic routes; environmental blends and composites; developments in processing and reactive processing of environmental polymers; characterization of environmental materials: mechanical, physical, thermal, rheological, morphological, and others; recyclable polymers and plastics recycling environmental testing: in-laboratory simulations, outdoor exposures, and standardization of methodologies; environmental fate: end products and intermediates of biodegradation; microbiology and enzymology of polymer biodegradation; solid-waste management and public legislation specific to environmental polymers; and other related topics.
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