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Ye J, Yang Y, Zhang L, Li M, Wang Y, Chen Y, Ling R, Yan J, Chen Y, Hu J, Fang Z. Molten Alkali-Assisted Formation of Silicate Gels and Its Application for Preparing Zeolites. Gels 2024; 10:392. [PMID: 38920938 PMCID: PMC11202758 DOI: 10.3390/gels10060392] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2024] [Revised: 05/30/2024] [Accepted: 05/31/2024] [Indexed: 06/27/2024] Open
Abstract
Fly ash was used as raw material to prepare zeolites through silicate gels, assisted by the hydrothermal method. The silicate gels could be effectively formed in a few minutes in a molten alkali environment. The zeolites could be prepared by using these silicate gels through the hydrothermal method, which realizes the transformation from useless materials to highly valuable materials. The obtained zeolites were applied to the removal of ammonium in water, achieving the highvalue utilization of fly ash. The synthesized zeolites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectrum (EDS), thermogravimetric (TG), and Fourier transform infrared (FTIR) spectroscopy. The study on the adsorption and removal of ammonium in water shows that the adsorption of ammonium is more in line with pseudo first-order kinetics, and the adsorption mainly occurs in the first 20 min. The adsorption can reach equilibrium in 30 min, and the maximum adsorption capacity can reach 49.1 mg/g. The adsorption capacity of ammonium has the best performance at pH = 5. Furthermore, within a certain range, an increase in temperature is beneficial for the removal of ammonium.
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Affiliation(s)
- Juan Ye
- College of Science and Technology, Ningbo University, 521 Wenwei Road, Ningbo 315300, China; (J.Y.); (L.Z.); (M.L.); (Y.W.); (Y.C.); (R.L.); (J.Y.); (J.H.)
| | - Yanchun Yang
- Ecological Environment Monitoring Station in Yanji City, Yanji 133001, China;
| | - Li Zhang
- College of Science and Technology, Ningbo University, 521 Wenwei Road, Ningbo 315300, China; (J.Y.); (L.Z.); (M.L.); (Y.W.); (Y.C.); (R.L.); (J.Y.); (J.H.)
| | - Man Li
- College of Science and Technology, Ningbo University, 521 Wenwei Road, Ningbo 315300, China; (J.Y.); (L.Z.); (M.L.); (Y.W.); (Y.C.); (R.L.); (J.Y.); (J.H.)
| | - Yiling Wang
- College of Science and Technology, Ningbo University, 521 Wenwei Road, Ningbo 315300, China; (J.Y.); (L.Z.); (M.L.); (Y.W.); (Y.C.); (R.L.); (J.Y.); (J.H.)
| | - Yuxuan Chen
- College of Science and Technology, Ningbo University, 521 Wenwei Road, Ningbo 315300, China; (J.Y.); (L.Z.); (M.L.); (Y.W.); (Y.C.); (R.L.); (J.Y.); (J.H.)
| | - Ruhui Ling
- College of Science and Technology, Ningbo University, 521 Wenwei Road, Ningbo 315300, China; (J.Y.); (L.Z.); (M.L.); (Y.W.); (Y.C.); (R.L.); (J.Y.); (J.H.)
| | - Jiefeng Yan
- College of Science and Technology, Ningbo University, 521 Wenwei Road, Ningbo 315300, China; (J.Y.); (L.Z.); (M.L.); (Y.W.); (Y.C.); (R.L.); (J.Y.); (J.H.)
| | - Yan Chen
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University, Changchun 130012, China;
| | - Jinxing Hu
- College of Science and Technology, Ningbo University, 521 Wenwei Road, Ningbo 315300, China; (J.Y.); (L.Z.); (M.L.); (Y.W.); (Y.C.); (R.L.); (J.Y.); (J.H.)
| | - Zhenxing Fang
- College of Science and Technology, Ningbo University, 521 Wenwei Road, Ningbo 315300, China; (J.Y.); (L.Z.); (M.L.); (Y.W.); (Y.C.); (R.L.); (J.Y.); (J.H.)
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Zhang J, Yang K, He X, Zhao X, Wei Z, He S. Research status of comprehensive utilization of coal-based solid waste (CSW) and key technologies of filling mining in China: A review. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 926:171855. [PMID: 38522538 DOI: 10.1016/j.scitotenv.2024.171855] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/26/2023] [Revised: 03/06/2024] [Accepted: 03/19/2024] [Indexed: 03/26/2024]
Abstract
Coal-based solid waste (CSW) is the solid waste generated in the process of coal mining, washing and pyrolysis, which is an important industrial solid waste. The comprehensive utilization of CSW is a key link in the process of clean and efficient utilization of coal, and the use of CSW for coal mine filling mining is an important means of "harmless, resourceful and large-scale" utilization. In order to study the research status of comprehensive utilization of CSW and key technologies of filling mining in China, this paper combs and analyzes the current situation of comprehensive utilization of CSW from three parts, namely, physical and chemical properties of CSW, Industry-related policies, and ways and means of comprehensive utilization. It is found that coal mine filling mining is a green disposal method with relatively reliable technical means, low supervision cost and large-scale disposal of CSW in the comprehensive utilization of CSW in China. Furthermore, an analysis was conducted on the current research status of key technologies in the CSW filling and mining process, including the integration of "mining, selection and filling", adsorption and complexation passivation of heavy metals in CSW, the preparation of CSW collaborative filling materials, and monitoring and control of the whole filling process, etc. Based on the above analysis and research, it was pointed out that there were some problems, namely: (1) large output of CSW and low level of comprehensive utilization; (2) high investment and high cost of CSW filling and mining; and (3) imperfect CSW waste filling mining theory and technology. In response to these issues, prospects have been made from the aspects of policy incentive mechanisms, collaborative utilization of CSW with multi-industry links, and the theory and technology of CSW filling mining. This study provided reference and inspiration for the comprehensive utilization of CSW in the world, and provides guidance for the large-scale promotion and application of CSW filling mining methods.
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Affiliation(s)
- Jiqiang Zhang
- Key Laboratory of Safe and Effective Coal, Mining Ministry of Education, Anhui University of Science and Technology, Huainan 232001, Anhui, China; School of Mining Engineering, Anhui University of Science and Technology, Huainan 232001, Anhui, China.
| | - Ke Yang
- Key Laboratory of Safe and Effective Coal, Mining Ministry of Education, Anhui University of Science and Technology, Huainan 232001, Anhui, China; Institute of Energy, Hefei Comprehensive National Science Center, Hefei 230031, China; School of Mining Engineering, Anhui University of Science and Technology, Huainan 232001, Anhui, China.
| | - Xiang He
- Key Laboratory of Safe and Effective Coal, Mining Ministry of Education, Anhui University of Science and Technology, Huainan 232001, Anhui, China; School of Mining Engineering, Anhui University of Science and Technology, Huainan 232001, Anhui, China
| | - Xinyuan Zhao
- Key Laboratory of Safe and Effective Coal, Mining Ministry of Education, Anhui University of Science and Technology, Huainan 232001, Anhui, China; School of Mining Engineering, Anhui University of Science and Technology, Huainan 232001, Anhui, China
| | - Zhen Wei
- School of Civil Engineering, Lanzhou Institute of Technology, Lanzhou 730050, Gansu, China
| | - Shuxin He
- Key Laboratory of Safe and Effective Coal, Mining Ministry of Education, Anhui University of Science and Technology, Huainan 232001, Anhui, China; School of Mining Engineering, Anhui University of Science and Technology, Huainan 232001, Anhui, China
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Turki T, Hamdouni A, Enesca A. Fluoride Adsorption from Aqueous Solution by Modified Zeolite-Kinetic and Isotherm Studies. Molecules 2023; 28:molecules28104076. [PMID: 37241817 DOI: 10.3390/molecules28104076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2023] [Revised: 05/02/2023] [Accepted: 05/10/2023] [Indexed: 05/28/2023] Open
Abstract
Fluorine is a very common element in the Earth's crust and is present in the air, food, and in natural waters. It never meets in the free state in nature due to its high reactivity, and it comes in the form of fluorides. Depending on the concentration of fluorine absorbed, it may be beneficial or harmful to human health. Similar to any trace element, fluoride ion is beneficial for the human body at low levels, but as soon as its concentration becomes too high, it is toxic, inducing dental and bone fluorosis. The lowering of fluoride concentrations that exceed the recommended standards in drinking water is practiced in various ways around the world. The adsorption process has been classified as one of the most efficient methods for the removal of fluoride from water as it is environmentally friendly, easy to operate, and cost-effective. The present study deals with fluoride ion adsorption on modified zeolite. There are several influential parameters, such as zeolite particle size, stirring rate, solution pH, initial concentration of fluoride, contact time, and solution temperature. The maximum removal efficiency of the modified zeolite adsorbent was 94% at 5 mg/L fluoride initial concentration, pH 6.3, and 0.5 g modified zeolite mass. The adsorption rate increases accordingly with increases in the stirring rate and pH value and decreases when the initial fluoride concentration is increased. The evaluation was enhanced by the study of adsorption isotherms using the Langmuir and Freundlich models. The Langmuir isotherm corresponds with the experimental results of the fluoride ions adsorption with a correlation value of 0.994. The kinetic analysis results of the fluoride ions adsorption on modified zeolite allowed us to demonstrate that the process primarily follows a pseudo-second-order and then, in the next step, follows a pseudo-first-order model. Thermodynamic parameters were calculated, and the ΔG° value is found to be in the range of -0.266 kJ/mol up to 1.613 kJ/mol amidst an increase in temperature from 298.2 to 331.7 K. The negative values of the free enthalpy ΔG° mean that the adsorption of fluoride ions on the modified zeolite is spontaneous, and the positive value of the enthalpy ∆H° shows that the adsorption process is endothermic. The ∆S° values of entropy indicate the fluoride adsorption randomness characteristics at the zeolite-solution interface.
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Affiliation(s)
- Thouraya Turki
- Natural Water Treatment Laboratory, Water Researches and Technologies Center (CERTE), Technopark of Borj-Cedria, P.O. Box 273, Soliman 8020, Tunisia
| | - Abdelkader Hamdouni
- High Institute of Sciences and Technology of Environment of Borj Cedria, University of Carthage, Carthage 1054, Tunisia
| | - Alexandru Enesca
- Product Design, Mechatronics and Environment Department, Transilvania University of Brasov, Eroilor 29 Street, 500036 Brasov, Romania
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Amino-Functionalized Cellulose Nanofiber/Lignosulfonate New Aerogel Adsorbent for the Removal of Dyes and Heavy Metals from Wastewater. Gels 2023; 9:gels9020154. [PMID: 36826324 PMCID: PMC9956574 DOI: 10.3390/gels9020154] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Revised: 02/10/2023] [Accepted: 02/11/2023] [Indexed: 02/16/2023] Open
Abstract
Due to the increasingly widespread water pollutants and the high cost of treatment methods, there is a demand for new, inexpensive, renewable, and biodegradable adsorbent materials for the purification of wastewater contaminants. In this study, a new biocomposite aerogel (Amf-CNF/LS) was prepared using a chemically cross-linking method between the amino-functionalized cellulose nanofibers (Amf-CNF) and lignosulfonates (LS). The physical and chemical properties of the prepared aerogel were investigated using several techniques including elemental analysis, scanning electron microscopy (SEM-EDS), Fourier transform infrared spectroscopy (FTIR), thermal gravimetric analysis (TGA), and N2 adsorption-desorption analysis. The Amf-CNF/LS aerogel was then applied for the removal of methylene blue (MB), rhodamine B dye (RhB), and the heavy metal cadmium ion (Cd2+) from synthetic wastewater solutions. The adsorption parameters controlling the adsorption process including the pH, contact time, adsorbent dosage, and adsorbate concen-tration were optimized. High adsorption kinetics and isotherms were observed, with the adsorption isotherms of the Amf-CNF/LS aerogel fitting the Langmuir model with maximum adsorption capacities of 170.94, 147.28, and 129.87 mg/g for MB, RhB, and Cd2+, respectively. These results show that Amf-CNF/LS aerogel is a promising green and inexpensive adsorbent for MB, RhB, and Cd2+ removal from wastewater.
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