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
✓ 已验证
DOI
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
✓ 已验证
产品关联
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
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
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
✓ 已验证
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
✓ 已验证
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）