Geopolymer-hydroxyapatite composite foams for wastewater remediation

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International Pub Date : 2024-09-28 DOI:10.1016/j.ceramint.2024.09.383

Elettra Papa, Valentina Medri, Elena Landi

引用次数: 0

Abstract

Two types of monolithic geopolymer-hydroxyapatite (HA) foams, different in terms of porosity, were produced by direct foaming through the addition of metallic silicon as blowing agent. The ability of the geopolymer to bind HA allowed an easy shaping and consolidation of the material. The total porosity of the two foams ranged from 72 to 87 % with similar surface areas (26–27 m² g⁻¹) despite different HA content (27 and 21 wt% respectively). Composite foams were compared with the pure geopolymer matrix assessing the surface electrostatic characteristics and testing methylene blue (MB) removal at pH = 7. At long times (24h) the best performing monolithic foam reached a removal efficiency of 76 % and 69 % respectively in 10 ppm and 50 ppm MB solution, while granulated foams reached an efficiency of 85 %. The best experimental data fit with the pseudo-second-order kinetic model indicating the chemisorption of MB.

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用于废水修复的土工聚合物-羟基磷灰石复合泡沫

通过添加金属硅作为发泡剂进行直接发泡，生产出了两种孔隙率不同的整体土工聚合物-羟基磷灰石（HA）泡沫。土工聚合物与羟基磷灰石的结合能力使材料易于成型和固结。两种泡沫的总孔隙率在 72% 到 87% 之间，表面积（26-27 m2 g-1）相似，尽管 HA 含量不同（分别为 27% 和 21%）。将复合泡沫与纯土工聚合物基质进行了比较，评估了表面静电特性，并在 pH = 7 的条件下测试了亚甲基蓝（MB）的去除率。在 10 ppm 和 50 ppm 的甲基溴溶液中，经过长时间（24 小时）的测试，性能最好的整体泡沫的去除率分别达到 76% 和 69%，而颗粒泡沫的去除率则达到 85%。最佳实验数据符合假二阶动力学模型，表明甲基溴具有化学吸附作用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Ceramics International 工程技术-材料科学：硅酸盐

CiteScore

9.40

自引率

15.40%

发文量

4558

审稿时长

25 days

期刊介绍： Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.