Coagulation mechanisms of humic acid in metal ions solution under different pH conditions: A molecular dynamics simulation

Ai, Yuejie; Zhao, Chaofeng; Sun, Lu; Wang, Xiangke; Liang, Lijun

doi:10.1016/j.scitotenv.2019.135072

Cited by 92 publications

(29 citation statements)

References 38 publications

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“…Low P is available on 15 WAP as the available P element can be utilized by plants. This is also supported by the opinion of Ai et al (2019). Humic acid has the potential of binding aggregate in the form of colloids to various contaminants but it can help in the trace process of nutrients.…”

Section: Soil Chemical Properties After Humic Acid Application On Andisol Soilmentioning

confidence: 76%

Effect of humic acid on the growth and yield of two maize (Zea mays L.) cultivars on andisol

Prakoso

Sulistyaningsih

Purwanto

2020

ipas

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One way to improve maize (Zea mays L.) production is through land extension using Andisol land. However, andisol soil has phosphate (P) fixation problem due to the high amorphous material. Hence, the use of organic material in the form of humic acid that has greater affinity to amorphous minerals is recommended to solve the problem. This research was conducted in February-May 2017 at Tri Dharma field of Faculty of Agriculture, Gadjah Mada University. The Andisol land used has a low available P category from Datar, West Java and Wonosobo, Central Java. This research was arranged in a Randomized Complete Block Design (RCBD), consisting of 2 factors. The first factor was maize cultivar (Bisi-2 and Pioneer-35). The second factor was the doses of humic acid, consisting of control treatment (without fertilizer and humic acid), NPK without humic acid, and NPK + humic acid at 5%, 10%, and 15%. The percentage of humic acid given, based on the amount of NPK 16:16:16 fertilizer, was 350 kg ha-1. Fertilization was applied 3 times 100 kg ha-1 on 1 WAP, 150 kg ha-1 at 3 WAP and 100 kg ha-1 at 7 WAP. The results is, humic acid treatment had the same effect with NPK fertilization treatment only and control on P available Andisol soil. Humic acid, also has the same effect with NPK fertilizer treatment in increasing the yield component of 100 seeds weight, dry weight of seeds, harvest index, length of cobs and productivity.

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Section: Soil Chemical Properties After Humic Acid Application On Andisol Soilmentioning

confidence: 76%

Effect of humic acid on the growth and yield of two maize (Zea mays L.) cultivars on andisol

Prakoso

Sulistyaningsih

Purwanto

2020

ipas

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“…The reason for this was that higher ionic valence would lead to more formation of coordination bonds with a stronger attraction effect. [ 50 ] Although this strong coordination bond can breakdown hydrogen bonds, it also limits the reorientation space of polarized groups and reduces the electron mobility, leading to decreased output voltage. [ 38 ] Even for a group with the same valence state, the output voltage of ions with larger atomic mass is larger.…”

Section: Resultsmentioning

confidence: 99%

“…This is because ions with larger atomic mass have stronger adsorption effects on hydroxyl groups. Thus, they are more likely to breakdown hydrogen bonds to form coordination bonds [ 50 ] (the sample stability output voltage after corona charge injection is shown in Figure S7, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Highly Enhanced Triboelectric Performance from Increased Dielectric Constant Induced by Ionic and Interfacial Polarization for Chitosan Based Multi‐Modal Sensing System

Sun

Choi

Cha

et al. 2021

Adv Funct Materials

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The coexistence of increasingly severe environmental concerns and bio-signal sensing systems drives the development of environmental affinity and energy harvesting materials. Chitosan is a richly sourced biodegradable material derived from crustaceans, which provides a new option for environmentally, wearable triboelectric nanogenerator (TENG). In this paper, the triboelectric performance of chitosan blends are proposed to enhance the dielectric constant by optimizing the ionic polarization and interface polarization for the first time, which fills in the blank of enhancing the output of chitosan triboelectric by systematically engineering in ionic/molecular and pH effect. Triboelectric output enhanced chitosan film in TENG shows an output voltage 3 times (18 V) higher than that of the initial film and 25 times (200 V) higher after corona charge injection. The chitosan film for wearable devices not only can be used as a unit of a triboelectric device to measure human motion signal, but also can be used as a piezoresistive sensor (ΔR/R 0 : 0 to 1.5) and an air humidity sensor (relative humidity: 20% to 90%) after mixing carbon black. The study provides a stimulating example that triboelectric nano generator/piezoresistive sensor is made from chitosan and used in the multi-modal sensing system.

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“…The concept of SOM as supramolecular aggregates of low-weight molecular species (partly stabilized by hydrophobic interactions, hydrogen bonds, and metal cation bridges) was considered using structural models of diverse complexity [22][23][24][25][26][27]. A big qualitative step in molecular modeling was achieved by introducing the Vienna Soil-Organic-Matter Modeler (VSOMM) tool [28,29] that can generate highly concentrated, condensed-phase models of SOM with a wide range spectrum of molecular sizes, offering control over the chemical composition.…”

Section: Introductionmentioning

confidence: 99%

On the Adsorption Mechanism of Humic Substances on Kaolinite and Their Microscopic Structure

et al. 2021

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Soil organic matter (SOM) and various inorganic minerals represent key components of soils. During pedogenesis and due to biological activity these species interact, having a crucial impact on the formation of an aggregated soil structure with a hierarchical arrangement from nano to macro scale. In this process, the formation of organo–mineral microaggregates represents a dominant factor affecting soil functions and properties. This study focuses on the interactions between humic substances (HSs) and the mineral kaolinite as typical representatives of SOM and soil minerals. By performing classical molecular dynamics (MD) simulations on models of HSs and kaolinite, we demonstrate how two dominant but chemically different kaolinite surfaces affect the stability of HSs microaggregates. By analyzing volumetric, structural, and energetic properties of SOM–kaolinite models, we explain possible mechanisms of the formation of stable SOM–clay aggregates and show how a polarized environment affects the electrostatic interactions, stabilizing the microscopic structure of SOM–mineral aggregates. Our results showed that when stable aggregates of HSs are confined in kaolinite nanopores, their interactions with kaolinite surfaces disintegrate them into smaller subaggregates. These subaggregates are adsorbed more strongly on the polar aluminol surface of kaolinite compared to less the active hydrophobic siloxane surface.

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Coagulation mechanisms of humic acid in metal ions solution under different pH conditions: A molecular dynamics simulation

Cited by 92 publications

References 38 publications

Effect of humic acid on the growth and yield of two maize (Zea mays L.) cultivars on andisol

Effect of humic acid on the growth and yield of two maize (Zea mays L.) cultivars on andisol

Highly Enhanced Triboelectric Performance from Increased Dielectric Constant Induced by Ionic and Interfacial Polarization for Chitosan Based Multi‐Modal Sensing System

On the Adsorption Mechanism of Humic Substances on Kaolinite and Their Microscopic Structure

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