Scientific Reports
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2025
·Vol. 15
·期 1
·1-11
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IF 3.9
Li Yingquan,Zhao Baowei,Shang Tingting
Both biochar and humic acid adsorb heavy metals, but their combined effect has rarely been reported. In this paper, the adsorption of Cu(II) by single biochar (BS) and biochar with humic acid (BS + HA) in aqueous solution were studied, and the effects of solution pH, initial Cu(II) concentration, temperature and Ca 2+ ionic strength on the adsorption of Cu(II) were investigated. The results showed that under the same time, the adsorption of Cu(II) under the BS and BS + HA systems showed an increasing trend with the increase of pH, and the maximum adsorption capacity of the BS + HA system was reached at a pH of about 4, while the BS system alone exhibited a noticeable lag. The increase of the initial concentration of Cu(II) also promoted the adsorption capacity of the two systems, and the adsorption of Cu(II) by the BS and the BS + HA systems was a spontaneous adsorption process, and the elevation of the temperature effectively promoted the adsorption of Cu(II). The addition of Ca 2+ could promote the adsorption efficacy of the single BS system, but had little effect on the BS + HA system. Overall, the BS + HA system showed better adsorption than the single BS system, and the addition of humic acid enhanced the adsorption performance of biochar to Cu(II). The results could provide a theoretical basis for the combined action of biochar and humic acid on the remediation of Cu(II) contaminated water.
研究领域:
环境科学
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土壤学
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水污染修复
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DOI
PubMed
高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
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2022
·
IF 3.752
Qian WEI,Liu-yang DONG,Cong-ren YANG,Xue-duan LIU,Fen JIAO,Wen-qing QIN
Lime (CaO) and sodium humate (NaHA) were used as the combined depressant for arsenopyrite pre-treated by CuSO 4 and butyl xanthate. Micro-flotation tests show that the combined depressant CaO and NaHA achieved the selective depression of arsenopyrite. Closed-circuit lab-scale test results indicate that the synergistic effect of CaO+NaHA achieved a satisfactory flotation separation of sphalerite and arsenopyrite, for which the Zn grade and recovery of Zn concentrate were 51.21% and 92.21%, respectively. Contact angle measurements, adsorption amount measurements and X-ray photoelectron spectroscopy analysis indicate that the dissolved calcium species (mainly as Ca 2+ ) were adsorbed on the mineral surfaces, thereby promoting NaHA adsorption. Moreover, the surface of the arsenopyrite absorbed more amount of calcium species and NaHA than that of the sphalerite, thereby accounting for the strong hydrophilic surface of arsenopyrite. The adsorption of NaHA on arsenopyrite was mainly chemical adsorption through its carboxyl groups and Ca atoms, whereas that on sphalerite surface was relatively weak.
研究领域:
矿物加工工程
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化学工程
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DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2020
·
IF 2.369
Yuhua Niu,Xingxing Han,Liangxian Huang,Jie Song
A novel degradable interpenetrating network hydrogel based on poly(vinyl alcohol) (PVA), potassium humate (KHA), and guar gum (GG) was successfully prepared via aqueous solution polymerization for the efficient adsorption and removal of methylene blue (MB) dye and Pb(II). The PVA/KHA/GG adsorbent was characterized using Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction, thermogravimetric analysis, zeta analysis, and scanning electron microscopy. Adsorption kinetics, pseudo-second-order equations, and activation energy (Ea) calculations illustrated that there was physisorption and chemisorption of both MB and Pb(II). Moreover, batch adsorption results were best suited to the Langmuir model; the maximum adsorption capacity (qm) for MB and Pb(II) at optimum conditions was 1166.73 and 625.21 mg/g, respectively. The results of thermodynamic analysis demonstrated that the adsorption of MB and Pb(II) onto PVA/KHA/GG was an endothermic and spontaneous process, driven by an increase in entropy. Furthermore, both FT-IR and X-ray photoelectron spectroscopy studies confirmed that the possible mechanism by which Pb(II) was removed mainly occurred via chemisorption of the anionic groups, whereas the adsorption of MB took place via physisorption through H-bonding, electrostatic interactions, and π–π stacking. Note that the adsorbent can be readily regenerated and efficiently reused for several cycles.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 135
·期 48
·46892
·
IF 1.901
H.L. Guan,D.L. Yong,M.X. Fan,X.L. Yu,Z. Wang,J.J. Liu,J.B. Li
The superabsorbent resin (SAR) containing sodium humate (SH) has been synthesized by free-radical graft copolymerization with acrylic acid, 2-acrylamido-2-methylpropane sulfonic acid, and SH as monomers in aqueous solution, using N,N ′-methylenebisacrylamide as crosslinking reagent and potassium persulfate as initiator. The structure and morphology of the as-prepared SARs were fully characterized by Fourier transform infrared , scanning electron microscopy and thermogravimetric analysis, respectively. Meanwhile, the effects of crosslinking reagent, initiator, SH, and neutralization degree on the water absorbency of SAR were studied. The results showed that the adding of SH in the SAR enhanced the salt-tolerating and moisture-resisting capacities obviously. The SAR without SH [poly(acrylic acid) (PAA)/2-acrylamido-2-methyl-1-propanesulfonic (AMPS)] showed a maximum water absorbency of 600 g g −1 in distilled water and 60 g g −1 in 0.9 wt % NaCl solution, while SAR modified by SH (PAA/AMPS/SH) exhibited the maximum water absorbency of 1380 g g −1 in distilled water and 117 g g −1 in 0.9 wt % NaCl solution. Furthermore, the moisture-resisting capacity of PAA/AMPS/SH decreases to 8 wt % compared with PAA/AMPS. PAA/AMPS/SH also has better water absorbency in different cation solutions. The results indicated that the introduction of SH could enhance the performance of SAR obviously. The possible reasons with this enhancement were also investigated. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46892.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
LANGMUIR
·
2018
·
IF 3.789
Youxing Liu,Jiaxiang Liu,Tianyu Yang
Highly dispersible SiC powder was prepared using sodium humate as a modifier. The results showed that the ζ-potential absolute value of the modified SiC powder increased from 13.1 to 38.7 mV when the adsorption capacity of sodium humate on the SiC surface was 2.368 mg/g. The slurry with a maximum solid content of 65 vol % was obtained using the modified SiC powder, and the minimum viscosity value was 0.322 Pa s at a solid content of 50 vol %. The adsorption kinetics equation of sodium humate on the SiC surface is t/qt = 0.6253t + 11.0472, which is in accordance with the pseudo-second-order kinetics model. In addition, the isotherm equation, ln qe = 0.461 ln Ce – 0.334, agrees with the Freundlich model. The adsorption energy of sodium humate on the SiC surface was 0.8280 kJ/mol, indicating that the adsorption type was physical adsorption.
研究领域:
材料科学
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表面化学
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产品关联
DOI
PubMed
高影响因子
Petroleum Science
·
2024
·
IF 6
Jing Tan,Wei Zhang,Xiu-Ling Yan,Hao Zhou,Sher Bahadar Khan,Seitkhan Azat,Shi-You Yan,Hao-Jie Ma,Xin-Tai Su
Humic acids (HAs) are widely used as filtrate and viscosity reducers in drilling fluids. However, their practical utility is limited due to poor stability in salt resistance and high-temperature resistance. High-temperature coal pitch (CP) is a by-product from coal pyrolysis above 650 °C. The substance's molecular structure is characterized by a dense arrangement of aromatic hydrocarbon and alkyl substituents. This unique structure gives it unique chemical properties and excellent drilling performance, surpassing traditional humic acids in drilling operations. Potassium humate is prepared from CP (CP-HA-K) by thermal catalysis. A new type of high-quality humic acid temperature-resistant viscosity-reducer (Graft CP-HA-K polymer) is synthesized with CP-HA-K, hydrolyzed polyacrylonitrile sodium salt (Na-HPAN), urea, formaldehyde, phenol and acrylamide (AAM) as raw materials. The experimental results demonstrate that the most favorable conditions for the catalytic preparation of CP-HA-K are 1 wt% catalyst dosage, 30 wt% KOH dosage, a reaction temperature of 250 °C, and a reaction time of 2 h, resulting in a maximum yield of CP-HA-K of 39.58%. The temperature resistance of the Graft CP-HA-K polymer is measured to be 177.39 °C, which is 55.39 °C higher than that of commercial HA-K. This is due to the abundant presence of amide, hydroxyl, and amine functional groups in the Graft CP-HA-K polymer, which increase the length of the carbon chains, enhance the electrostatic repulsion on the surface of solid particles. After being aged to 120 °C for a specified duration, the Graft CP-HA-K polymer demonstrates significantly higher viscosity reduction (42.12%) compared to commercial HA-K (C-HA-K). Furthermore, the Graft CP-HA-K polymer can tolerate a high salt concentration of 8000 mg·L − 1 , measured after the addition of optimum amount of 3 wt% Graft CP-HA-K polymer. The action mechanism of Graft CP-HA-K polymer on high-temperature drilling fluid is that the Graft CP-HA-K polymer can increase the repulsive force between solid particles and disrupt bentonite's reticulation structure. Overall, this research provides novelty insights into the synthesis of artificial humic acid materials and the development of temperature-resistant viscosity reducers, offering a new avenue for the utilization of CP resources.
研究领域:
化学工程
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材料科学
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DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2021
·
IF 3.315
Tao Liu,Hanfeng Zhou,Yingying Lan,Chen Qiu,Guangming Du,Xintai Su
Although the resource utilization of organic solid waste from biomass (OSWB) has been investigated, it is difficult to completely utilize such resources using the existing methods. Therefore, the development of a comprehensive application method would be very significant. Here, a simple process using chemical oxidation of H 2 O 2 was initially developed to prepare potassium humate (HA-K) from cotton stalk peels. Subsequently, we obtained three-dimensional hierarchical porous carbon (3D-HPC) materials by carbonizing and activating the residue after HA-K extraction. Chemical oxidation achieved the effect of “killing two birds with one stone” because it increased the HA-K yield by 40% and the capacitance of the electrode based on 3D-HPC (3OCA-500-650). Compared with the electrode without chemical oxidation, the obtained 3OCA-500-650 exhibited higher specific capacitance (420 F g −1 at 0.5 A g −1 ), enhanced an energy density (58 Wh kg −1 at a power density of 1300 W kg −1 ). This work provides a green, facile technology to achieve full utilization of OSWB, which is expected to be effective and scalable for preparing HA-K and electrochemical energy storage materials exhibiting excellent performance.
研究领域:
材料科学
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环境科学
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能源科学
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DOI
高影响因子
Results in Engineering
·
2025
·
IF 7.9
Baojun Yang,Xin Zhang,Yuling Liu,Xin Sun,Yang Liu,Jun Wang,Shitong Liu,Rui Liao,Guanzhou Qiu
Arsenopyrite is an important gold-bearing sulfide mineral, and pretreatment is essential before gold extraction to maximize gold recovery. Bioleaching, with its advantages of simple operation and environmental friendliness, has received widespread attention over the past decade. However, the low efficiency and long cycle of bioleaching hinder its large-scale application. Humic acid (HA) is a potential substance that can enhance the bioleaching of arsenopyrite and has advantages such as ease of acquisition, and environmental friendliness. Currently, there is a lack of research on the promoting effect and mechanism of HA on the bioleaching of arsenopyrite under the action of mesophile microorganism. This study investigates the effects of HA mediated by Acidithiobacillus ferrooxidans on the arsenopyrite leaching behavior, the valence states and forms of arsenic. The results showed HA can promote the bioleaching of arsenopyrite and shorten the leaching cycle. The addition of 20 mg/L HA can significantly reduce the bioleaching cycle of arsenopyrite from 14 days (without HA) to 6 days. HA can promote the growth of microorganisms and enhance the Fe/S oxidation capacity of microorganisms. Meanwhile, HA can adsorb onto the mineral surface, facilitating the oxidation of arsenopyrite by Fe 3+ adsorbed by HA, thereby promoting the bioleaching of arsenopyrite. This study offers new insights into shortening arsenopyrite bioleaching cycle.
研究领域:
生物冶金
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环境生物技术
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微生物学
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地球化学
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DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
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IF 7.2
Jiamin Qi,Jiliang Zheng,Yatang Dai,Bo Yang,Haohao Bian,Xinyu Chen,Shunyu Yin,Xiuling Yan,Xiaoyan He,Hongguang Zhao,Yanjie Ren,Changchun Ge,Xintai Su
With ongoing economic development, the generation of waste vegetable leaves (WVL) has surged, posing significant environmental risks if not properly managed. To address this challenge, our study developed a copper-based catalyst (Cu 2 O@HAK) derived from WVL, which efficiently catalyzed the conversion of these leaves into artificial potassium humate (C-K-Cu-HAK). Notably, the yield of C-K-Cu-HAK increased from 40.18 % to 95.34 % with the addition of this catalyst. Optimization of the hydrothermal degradation process using response surface methodology (RSM) identified the optimal conditions: a catalyst dosage of 5 %, a reaction temperature of 150 °C, a reaction time of 7 h, and a KOH concentration of 0.6 mol/L. Under these conditions, the extraction efficiency reached 95.25 %. The resulting C-K-Cu-HAK product not only exceeded Chinese national standards for soluble humic acid (HA) content (65.42 %) and K 2 O content (15.48 %), but also demonstrated superior performance in hydroponic trials, significantly enhancing seed germination and plant growth compared to commercial potassium humate (HAK). This study tackles the environmental burden of WVL while introducing an efficient copper-based catalyst that significantly enhances HAK yield. These findings have important implications for environmental protection and sustainable resource utilization, offering a novel approach to HAK production with broad application potential.
研究领域:
环境科学
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农业科学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2025
·
IF 8.5
Sidra Chaudhary,Xuhao Zhang,Yi Bai,Simo Ma,Yong Wu,Qinxiang Jia,Xiaoyong Li,Yang Sun
This study introduces an innovative method for synthesizing multifunctional water-retaining agents via ammonium persulfate-initiated alkaline copolymerization of sodium humate with diverse functional components. The resulting materials exhibit exceptional and reproducible water/saline absorbing capabilities, outstanding water retention performance, and remarkable UV resistance. Structural characterization demonstrates that sodium humate's graphite backbone can be either preserved or modified depending on the copolymerized components, with polyvinyl alcohol (37.41–93.82 g g −1 ) and polyvinyl pyrrolidone (39.23–97.66 g g −1 ) composites showing particularly superior water absorption properties over 18 recycling cycles. A significant discovery is the concurrent formation of ammonium nitranilate, a high-energy-density salt, whose production from humic acid not only confirms Stevenson's structural model featuring quinone moieties but also offers an economical alternative to conventional chloranil-based synthesis that requires hazardous chlorine gas and expensive precursors. This work thus accomplishes dual breakthroughs: developing high-performance irrigation materials for arid regions while establishing a highly effective valorization pathway for humic acid to produce valuable energetic compounds.
研究领域:
高分子化学
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农业工程
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材料科学
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环境化学
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产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Qiang Liu,Mahmoud Mazarji,Yeqing Li,Lu Feng,Hongjun Zhou,Quan Xu,Alastair James Ward,Yajing Wang,Jianping Su,Chunming Xu,Junting Pan
Humic acid (HA) is an inhibitor that can diminish bioconversion during anaerobic digestion (AD). In this study, a non-metallic nanomaterial, N-doped carbon quantum dots (NCQD), was synthesized to alleviate the HA inhibition, followed by exploring its mechanism. Adding 500 mg/L NCQD prevented HA inhibition by binding to HA or microorganism surfaces, thus avoiding contact between them. This phenomenon, known as shielding inhibition, involves the formation of hydrogen bonds and chemical bonds. The intermolecular force and dissociation constant ( K D ) between NCQD and HA were determined to be 112.83 ± 3.98 nN and 1.0 ± 0.07 × 10 -7 M, respectively. NCQD could promote electron transfer in AD systems. According to the in-depth microbial analysis, NCQD significantly enhanced the metabolic pathways of methanogenesis and biosynthesis of coenzyme F 420 . This groundbreaking research demonstrates the dual functionality of NCQD by effectively shielding against HA inhibition and promoting electron transfer. The study also unravels the mechanism of interface interaction, electron transfer, and metabolic pathways, leading to significant breakthroughs in addressing HA inhibition.
研究领域:
环境科学
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纳米技术
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生物化学
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微生物学
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能源工程
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产品关联
DOI
高影响因子
Materials
·
2025
·Vol. 18
·期 4
·823
·
IF 3.2
Qingya Niu,Jiayin Xie,Jiayan Li,Zaixu An,Huijie Xiao,Xiaoyuan Zhang,Zhiqiang Su,Zhichao Wang
Significant progress has been achieved in the development of superabsorbent polymers (SAPs), focusing on enhancing their performance and expanding their applications. Efforts are particularly directed at increasing water absorbency while promoting environmental sustainability. Biodegradable materials such as starch and potassium humate have been successfully integrated with SAPs for desert greening, improving water retention, salt resistance, and seedling survival. The inclusion of nutrient-rich organic-inorganic composites further enhances the durability, efficiency, and recyclability of SAPs. In drought mitigation, polymeric absorbent resins such as polyacrylamide and starch-grafted acrylates have shown efficacy in ameliorating soil conditions and fostering plant growth. In arid environments, agents enriched with humic acid and bentonite contribute to improved soil aeration and water retention, creating optimal conditions for plant establishment. Additionally, the adoption of innovative waste management solutions has led to the production of amphiphilic SAPs from residual sludge, effectively addressing soil nutrient deficiencies and environmental pollution. In the food industry, SAPs containing protease, tea polyphenols, and chitosan exhibit potential for enhancing the stability and quality of seafood products. These advancements highlight the growing relevance of structural optimization approaches in SAP development across diverse applications and underline the importance of continued innovation in these fields. As novel materials emerge and environmental challenges intensify, the potential applications of SAPs are anticipated to expand significantly.
研究领域:
生态学
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环境科学
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材料科学
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农业科学
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）