Biomimetic Hydrogel Composites for Soil Stabilization and Contaminant Mitigation

Zhao, Zhi; Hamdan, Nasser; Shen, Li; Nan, Hanqing; Almajed, Abdullah; Kavazanjian, Edward; He, Ximin

doi:10.1021/acs.est.6b01285

Cited by 62 publications

(31 citation statements)

References 61 publications

(87 reference statements)

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“…Overall, we believe that C. acutatum may be useful for the protection of cultural relics in the future. In addition, the findings will be useful for the understanding the applications of bio-treatment in other areas, such as self-healing concrete ( Luo et al, 2018 ) and bio-consolidation ( DeJong, et al, 2010 ).…”

Section: Discussionmentioning

confidence: 99%

Biomineralization Induced by Colletotrichum acutatum: A Potential Strategy for Cultural Relic Bioprotection

Zhang

2018

Front. Microbiol.

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Colletotrichum acutatum is a fungus capable of biomineralization reported in our previous study. In this paper, we compared the ability of this fungus to induce mineralization under different calcium sources, pH levels, and differing carbon availability. Here we found that organic acids, the alkalinity of the environment, and low carbon conditions were major factors influencing calcium carbonate precipitation. High performance liquid chromatography showed that citric acid was a metabolite produced by C. acutatum, and that other organic acids including formic, propionic, α-ketoglutaric, lactic, and succinic acids can be used by this fungus to promote CaCO3 formation. Based on these findings, the mechanism of the biomineralization induced by C. acutatum should be divided into three processes: secreting organic acid to dissolve limestone, utilizing the acid to increase the alkalinity of the microenvironment, and chelating free calcium ions with extracellular polymeric substances or the cell surface to provide a nucleation site. Interestingly, we found that hydroxyapatite rather than calcium carbonate could be produced by this fungus in the presence of phosphate. We also found that the presence of acetic acid could inhibit the transformation of vaterite to calcite. Further, we evaluated whether the proliferation of C. acutatum could influence the deterioration of stone relics. We found that low carbon conditions protected calcium carbonate from dissolution, indicating that the risk of degradation of limestone substrates caused by C. acutatum could be controlled if the fungi were used to consolidate or restore stone monuments. These results suggest that C. acutatum-induced biomineralization may be a useful treatment for deteriorated stone relics.

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Section: Discussionmentioning

confidence: 99%

Biomineralization Induced by Colletotrichum acutatum: A Potential Strategy for Cultural Relic Bioprotection

Zhang

2018

Front. Microbiol.

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“…To evaluate the long-term durability of the samples, we employed the accelerated thermal degradation test described in our previous work (Zhao et al, 2016). In this test, small-scale poly(PAAm-co-30% HEMA)treated cylindrical soil samples (2.50 cm × 1.85 cm) were placed in an oven under 50°C for 30 days.…”

Section: Long-term Heat Durabilitymentioning

confidence: 99%

“…We have previously reported synthesis of a hybrid soil stabilizing material based on a combination of EICP and a biopolymer, xanthan gum , or a synthetic hydrogel, poly(acrylic acid) (PAAc) (Zhao et al, 2016). This method can significantly enhance the strength of treated soil after dehydrated Zhao et al, 2016). However, this approach suffers from a water durability problem arose from drastic polymer swelling.…”

Section: Introductionmentioning

confidence: 99%

“…In this research, we managed to mitigate the water durability problems using a series of hydrophilic-hydrophobic copolymers instead of hydrogels. Additionally, we used a non-toxic (Andersen, 2005; Berndt et al, 1991;Horak et al, 1997) polyacrylamide (PAAm) backbone to replace the polyacrylic acid (PAAc) backbone used in previous research (Zhao et al, 2016) to facilitate curing under ambient temperature conditions instead of at elevated temperature and for reducing peroxide initiator usage. The curing rate was also improved from longer than 1 day to several minutes (under ambient temperature).…”

Section: Introductionmentioning

confidence: 99%

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Durable and ductile double-network material for dust control

Tirkolaei

Hua

et al. 2020

Geoderma

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Dust generation is a worldwide issue due to its serious deleterious effects on the environment, human health and safety, and the economy. Although various dust suppression methods have been used for decades, some critical drawbacks in state-of-the-art technology still remain unsolved, such as short-lasting, ground water impact, and prone to water. This work reports a soil stabilizer based on non-toxic material and forms a ductile and durable double-network in soil, namely "D 3 soil stabilizer", which not only improves soil mechanical toughness of surface soil but also suppresses dust generation. A copolymer comprising hydrophilic and hydrophobic components combined with enzyme-induced carbonate precipitation is utilized as an in-situ gelation binder to soil particle. The tunable hydrophobic-to-hydrophilic component ratio minimizes undesirable soil matrix expansion and mechanical strength loss upon experiencing wet-dry processes, while still retains good water affinity. We further demonstrated controllable treatment depth by fine-tuning precursor composition, which is essential to minimize environmental impact. The double-network morphology with carbonate precipitate embedded uniformly in polymer matrix is observed via microscopic imaging. The nature of outstanding ductility, high durability against water, and good long-term stability were supported by systematic unconfined compressive strength (UCS) measurements on treated soil, which show strong inter-particles binding, good retention of peak strength, increased strain at peak strength, and increased toughness after soil samples have experienced wet-dry processes.

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“…As an attempt to contribute to the field of soil stabilization, bio cementation by CaCO 3 is also employed as a sustainable method of soil stabilization [25][26][27][28][29], which includes improvement of geotechnical properties of soil as well as contaminant remediation. This study evaluates the use of one such method, known as enzyme induced calcite precipitation (EICP), to immobilize heavy metals as a method of decontaminating soil.…”

Section: Introductionmentioning

confidence: 99%

Efficacy of Enzymatically Induced Calcium Carbonate Precipitation in the Retention of Heavy Metal Ions

Moghal

Lateef²,

Mohammed³

et al. 2020

Sustainability

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This study evaluated the efficacy of enzyme induced calcite precipitation (EICP) in restricting the mobility of heavy metals in soils. EICP is an environmentally friendly method that has wide ranging applications in the sustainable development of civil infrastructure. The study examined the desorption of three heavy metals from treated and untreated soils using ethylene diamine tetra-acetic acid (EDTA) and citric acid (C6H8O7) extractants under harsh conditions. Two natural soils spiked with cadmium (Cd), nickel (Ni), and lead (Pb) were studied in this research. The soils were treated with three types of enzyme solutions (ESs) to achieve EICP. A combination of urea of one molarity (M), 0.67 M calcium chloride, and urease enzyme (3 g/L) was mixed in deionized (DI) water to prepare enzyme solution 1 (ES1); non-fat milk powder (4 g/L) was added to ES1 to prepare enzyme solution 2 (ES2); and 0.37 M urea, 0.25 M calcium chloride, 0.85 g/L urease enzyme, and 4 g/L non-fat milk powder were mixed in DI water to prepare enzyme solution 3 (ES3). Ni, Cd, and Pb were added with load ratios of 50 and 100 mg/kg to both untreated and treated soils to study the effect of EICP on desorption rates of the heavy metals from soil. Desorption studies were performed after a curing period of 40 days. The curing period started after the soil samples were spiked with heavy metals. Soils treated with ESs were spiked with heavy metals after a curing period of 21 days and then further cured for 40 days. The amount of CaCO3 precipitated in the soil by the ESs was quantified using a gravimetric acid digestion test, which related the desorption of heavy metals to the amount of precipitated CaCO3. The order of desorption was as follows: Cd > Ni > Pb. It was observed that the average maximum removal efficiency of the untreated soil samples (irrespective of the load ratio and contaminants) was approximately 48% when extracted by EDTA and 46% when extracted by citric acid. The soil samples treated with ES2 exhibited average maximum removal efficiencies of 19% and 10% when extracted by EDTA and citric acid, respectively. It was observed that ES2 precipitated a maximum amount of calcium carbonate (CaCO3) when compared to ES1 and ES3 and retained the maximum amount of heavy metals in the soil by forming a CaCO3 shield on the heavy metals, thus decreasing their mobility. An approximate improvement of 30% in the retention of heavy metal ions was observed in soils treated with ESs when compared to untreated soil samples. Therefore, the study suggests that ESs can be an effective alternative in the remediation of soils contaminated with heavy metal ions.

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Biomimetic Hydrogel Composites for Soil Stabilization and Contaminant Mitigation

Cited by 62 publications

References 61 publications

Biomineralization Induced by Colletotrichum acutatum: A Potential Strategy for Cultural Relic Bioprotection

Biomineralization Induced by Colletotrichum acutatum: A Potential Strategy for Cultural Relic Bioprotection

Durable and ductile double-network material for dust control

Efficacy of Enzymatically Induced Calcium Carbonate Precipitation in the Retention of Heavy Metal Ions

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