A novel acidic phosphoric-based geopolymer binder for lead solidification/stabilization

Pu, Shaoyun; Zhu, Zhiduo; Song, Wei; Wang, Hairong; Huo, Wangwen; Zhang, Jie

doi:10.1016/j.jhazmat.2021.125659

Cited by 83 publications

(20 citation statements)

References 74 publications

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“…Geopolymer is a novel binder that was established to substitute OPC in concrete production [ 20 , 21 , 22 ]. The purpose is to acquire a building material that is free of OPC, environmentally caring, and sustainable.…”

Section: Introductionmentioning

confidence: 99%

Application of Soft Computing Techniques to Predict the Strength of Geopolymer Composites

Wang

Ahmad

et al. 2022

Polymers

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Geopolymers may be the best alternative to ordinary Portland cement because they are manufactured using waste materials enriched in aluminosilicate. Research on geopolymer composites is accelerating. However, considerable work, expense, and time are needed to cast, cure, and test specimens. The application of computational methods to the stated objective is critical for speedy and cost-effective research. In this study, supervised machine learning approaches were employed to predict the compressive strength of geopolymer composites. One individual machine learning approach, decision tree, and two ensembled machine learning approaches, AdaBoost and random forest, were used. The coefficient correlation (R2), statistical tests, and k-fold analysis were used to determine the validity and comparison of all models. It was discovered that ensembled machine learning techniques outperformed individual machine learning techniques in forecasting the compressive strength of geopolymer composites. However, the outcomes of the individual machine learning model were also within the acceptable limit. R2 values of 0.90, 0.90, and 0.83 were obtained for AdaBoost, random forest, and decision models, respectively. The models’ decreased error values, such as mean absolute error, mean absolute percentage error, and root-mean-square errors, further confirmed the ensembled machine learning techniques’ increased precision. Machine learning approaches will aid the building industry by providing quick and cost-effective methods for evaluating material properties.

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Section: Introductionmentioning

confidence: 99%

Application of Soft Computing Techniques to Predict the Strength of Geopolymer Composites

Wang

Ahmad

et al. 2022

Polymers

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“…The compound formation method involves the formation of a series of heavy metal ions in an alkaline environment, which allows the heavy metal ions to be immobilized in the geopolymer. 111 For example, research according to Jin et al 97 shows that when the sludge base mass polymer is calcined at 1000 • C, Cr 3+ forms Cr 1.3 Fe 0.7 O 0.5 , Ca 5 (CrO 4 ) 3 O 0.5 and other metal compounds, and the Cr 3+ leaching concentration decreases. In addition, Pb 2+ will precipitate insoluble silicate (Pb 3 SiO 5 ) in geopolymer.…”

Section: Leaching Testmentioning

confidence: 99%

Sludge‐based geopolymer materials: A review

Kong,

Shi,

Shen

et al. 2024

Int J Applied Ceramic Tech

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Sludge refers to the solid waste produced after sewage treatment. Unreasonable disposal of sludge can cause environmental pollution. Nonetheless, the sludge contains large amounts of silica‐aluminate, which has pozzolanic activity by treatment, and the sludge can be used as a sustainable building material. The previous studies have recommended that it is reasonable to produce geopolymers, that is, a green low‐carbon cementitious material with excellent mechanical and durability properties, from sludge. This article provides an overview of recent advancements in the study of sludge‐based geopolymer. It delves into the mechanisms behind alkali‐activated geopolymer, examines the feasibility of preparing geopolymer from sludge, and discusses various preparation methods. Additionally, it elaborates on the impact of incorporating different auxiliary materials on sludge‐based geopolymer. The comprehensive performance of sludge‐based geopolymer, encompassing mechanical properties, durability, and setting time, is thoroughly summarized. An environmental assessment is conducted, evaluating heavy metal leaching and the lifecycle of sludge‐based geopolymer. Finally, we briefly discuss some problems in the current research and development trends in the future on sludge‐based geopolymer. The aim of this article is to provide comprehensive support and guidance for both the research and practical engineering applications of sludge‐based geopolymer.

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“…In addition to alkali-activated geopolymers, an acidic phosphoric-based geopolymer was adopted for the S/S of Pb. It was shown that the acidic phosphoric-based geopolymer has a better S/S performance of Pb 2+ than that of alkali-activated geopolymers under acidic conditions [ 94 ]. Pb 2+ can react with

to form stable compounds, including Pb 3 (PO 4 ) 2 and PbHPO 4 , which are proposed as the main reaction mechanisms.…”

Section: Geopolymer-based S/s Processmentioning

confidence: 99%

Application of Geopolymer in Stabilization/Solidification of Hazardous Pollutants: A Review

et al. 2022

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Geopolymers, as a kind of inorganic polymer, possess excellent properties and have been broadly studied for the stabilization/solidification (S/S) of hazardous pollutants. Even though many reviews about geopolymers have been published, the summary of geopolymer-based S/S for various contaminants has not been well conducted. Therefore, the S/S of hazardous pollutants using geopolymers are comprehensively summarized in this review. Geopolymer-based S/S of typical cations, including Pb, Zn, Cd, Cs, Cu, Sr, Ni, etc., were involved and elucidated. The S/S mechanisms for cationic heavy metals were concluded, mainly including physical encapsulation, sorption, precipitation, and bonding with a silicate structure. In addition, compared to cationic ions, geopolymers have a poor immobilization ability on anions due to the repulsive effect between them, presenting a high leaching percentage. However, some anions, such as Se or As oxyanions, have been proved to exist in geopolymers through electrostatic interaction, which provides a direction to enhance the geopolymer-based S/S for anions. Besides, few reports about geopolymer-based S/S of organic pollutants have been published. Furthermore, the adsorbents of geopolymer-based composites designed and studied for the removal of hazardous pollutants from aqueous conditions are also briefly discussed. On the whole, this review will offer insights into geopolymer-based S/S technology. Furthermore, the challenges to geopolymer-based S/S technology outlined in this work are expected to be of direct relevance to the focus of future research.

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A novel acidic phosphoric-based geopolymer binder for lead solidification/stabilization

Cited by 83 publications

References 74 publications

Application of Soft Computing Techniques to Predict the Strength of Geopolymer Composites

Application of Soft Computing Techniques to Predict the Strength of Geopolymer Composites

Sludge‐based geopolymer materials: A review

Application of Geopolymer in Stabilization/Solidification of Hazardous Pollutants: A Review

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