CHEMOSPHERE
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2021
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IF 7.086
LingYan Liu,ChunHong Zhang,ShuangRong Chen,Lan Ma,YingMei Li,YiFeng Lu
La(OH) 3 -modified canna biochar (CBC-La) was prepared by a coprecipitation method (dipping method), and its phosphate adsorption characteristics were investigated. The results show that the pseudo-second-order kinetics and the Langmuir model can be used to describe the adsorption process with a high level of accuracy. Adsorption equilibrium could be reached at 8 h, at which point the maximum adsorption capacity was shown to be 37.37 mg/g. CBC-La has excellent phosphate adsorption capacity in the middle to low concentrations (≤50 mg/L), and its removal rate can exceed 99 %. CBC-La also has wide pH adaptability (3–9) and a strongly selective adsorption performance. Notably, it can still maintain a removal rate of over 99.8 % in the presence of certain anions (NO 3 − , HCO 3 − , and CO 3 2− ), and the presence of NH 4 + has a synergistic effect on the adsorption process. Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) measurements demonstrate that the main mechanisms of CBC-La phosphate adsorption are electrostatic adsorption, ion exchange, ligand exchange and inner sphere complexation.
研究领域:
环境科学
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材料科学
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水处理
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吸附技术
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生物炭改性
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高影响因子
CARBOHYDRATE POLYMERS
·
2022
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IF 10.723
Liping Tan,Weihua Zhang,Xiaoguang Zhu,Yue Ru,Wenbo Yi,Bo Pang,Tongjun Liu
Lanthanum (La)-based nanoparticles (NPs) are promising candidates for phosphate removal owing to their inherently high affinity towards phosphate. However, significant challenges remain to be addressed before their practical deployment, especially the problems associated with their aggregation. Herein, we fabricated a high-efficient sorbent for phosphate removal through in-situ synthesizing La(OH) 3 NPs on a natural support, bacterial cellulose (BC), which is pre-modified with polyethyleneimine. The resultant La(OH) 3 NPs-immobilized BC with different La contents (BPLa-X) exhibited a highly fibrous porous structure, in which BPLa-3 was selected for further phosphate adsorption studies. BPLa-3 demonstrated a high adsorption capacity of 125.5 mg P g −1 , and high adsorption selectivity due to the large surface area and abundant exposed active adsorption sites for phosphate. Additionally, BPLa-3 also displayed high reusability and still possessed high adsorption capacity after four consecutive cycles of adsorption-desorption. Therefore, the present adsorbent is believed to be a promising candidate for practical phosphate removal.
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高影响因子
BIORESOURCE TECHNOLOGY
·
2018
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IF 5.807
Taiwan Liao,Ting Li,Xiangde Su,Xiang Yu,Huiyu Song,Yi Zhu,Yuanming Zhang
A series of La(OH) 3 -modified magnetic pineapple biochar (La x -MC) with different contents of La(OH) 3 were prepared and used as phosphate adsorbents for the first time. With the increase of La(OH) 3 content, the adsorption capacity for phosphate increased while the magnetic property decreased. La10-MC exhibited excellent magnetic property for easy recovery and high adsorption capacity up to 101.16 mg P/g, which was 27 times that of pineapple biochar and much higher than most phosphate adsorbents. Adsorption isotherm and adsorption kinetics were better fitted by Langmuir model and pseudo second-order model, respectively. The removal efficiency >96.04% in coexisting ions indicated its high selectivity to phosphate. Little decrease in removal efficiency after three adsorption-desorption cycles suggested its excellent stability and cyclic utilization. Leaching study demonstrated the negligible risk of La 3+ and Fe 3+ leakage during adsorption process. Mechanism study revealed that the adsorption mechanism involved precipitation, electrostatic interaction, ligand exchange and inner-sphere complexation.
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WATER SCIENCE AND TECHNOLOGY
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2020
·Vol. 82
·期 10
·2098-2113
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IF 1.638
He Jiaojie,Yang Yue,Xu Yuhong,Wang Zichuan,Xu Bing,Huang Yuheng,Yang Liwei
In this study, an excellent phosphate adsorbent was prepared for removing phosphate to an extremely low concentration. The La(OH) 3 nano-rods stabilizing in polyacrylonitrile (PAN) nanofibers (PLNFs) were prepared by electrospinning and a subsequent in situ precipitation. PAN nanofibers were employed as the matrix of the composite nanofibers, where the well-dispersed La(OH) 3 nano-rods were encapsulated as the active species for highly efficient phosphate capture owing to the strong binding between phosphate and lanthanum. On account of the nano-structure, the maximum phosphate adsorption capacity was 151.98 mg P/g (La), much higher than the result of La(OH) 3 nano-crystal, produced by precipitation without PAN or any organic surfactants. Moreover, the PLNFs could remove phosphate (2 mg P/L) to an extremely low concentration within 20 min, which could lead to a nutrient deficient condition to protect water quality and ecosystem. The optimization of PLNFs design was implemented through parameter adjustment of electrospinning. Lanthanum salt content, humidity, concentration of solution and applied voltage were chosen to analyze the influences on the composition, diameter and morphology of the nanofibers, giving the result that the most effective adsorbent was the PLNFs with spider-web-like nano-structures. The La(OH) 3 nano-rods stabilizing in polyacrylonitrile nanofibers (PLNFs) were prepared by electrospinning and a subsequent in situ precipitation. The maximum phosphate adsorption capacity by PLNFs was 151.98 mg P/g (La). The PLNFs could remove phosphate (2 mg P/L) to an extremely low concentration within 20 min. The PLNFs with spider-web-like nano-structures showed the highest phosphate removal.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Haotian Hao,Yao Zhang,Shuo Xu,Zihao Wang,Yili Wang,Shan Wang,Baoyou Shi
Enriching low-concentration phosphorus in water is prerequisite for phosphorus recovery. In this study, a polyvinyl alcohol (PVA)-assisted high-temperature stabilization method was developed to synthesize a magnetically recoverable La(OH) 3 -Fe 2 O 3 composite, designated as PMLH, via stable crosslinking. Compared with MLH-1, a conventionally synthesized La(OH) 3 /Fe 2 O 3 composite, PMLH-1 (La/Fe molar ratio = 1:1) exhibited 31.77 % more La(OH) 3 adsorption sites and maintained 2.32 times higher phosphate adsorption capacity after 10 reuse cycles. The optimal synthesis conditions were determined as calcination temperature of 150 °C, PVA dosage of 0.375 %, and La-to-Fe molar ratio of 1.5. Structural characterization revealed that PMLH-1.5 consisted of rod-like La(OH) 3 and irregular γ-Fe 2 O 3 tightly bonded via PVA bridging. The composite demonstrated a maximum phosphate adsorption capacity of 79.51 mg P/g, reaching equilibrium within 16 h at 0.5 g/L dosage. The saturated adsorption remained stable across pH 3–9. While coexisting NO 3 − and humic acid showed negligible effects, Mg 2+ , Cl − , SO 4 2− and HCO 3 − reduced adsorption by 10–20 %, whereas Ca 2+ significantly enhanced phosphate uptake. Notably, PMLH-1.5 exhibited exceptional practical performance, exceeding its theoretical saturation capacity by 20 % with prolonged adsorption in real water matrices. Efficient desorption (4 h) was achieved using 2.5 M NaOH/1.875 M NaCl mixed solution. The PMLH-1.5 demonstrated remarkable stability across 40 consecutive adsorption-desorption cycles using actual water samples, consistently meeting discharge standards for 13–14 full cycles. This performance established a new reference point for cyclic durability assessments in water treatment research. Sequential desorption in the same desorbent progressively concentrated phosphorus from 0 to 26.69 mg/L, enabling effective low-concentration phosphate enrichment. Economic analysis confirmed that PMLH-1.5 exhibits a competitive chemical cost, ranging from 3.28 to 5.26 CNY/mol P (0.46 to 0.74 US $/mol P).
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FUEL
·
2023
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IF 7.4
Wenqi Zhao,Xiaowei Bai,Xiangrui Lin,Yalkunjan Tur sun,Mei Zhong,Zhenghua Dai,Jian Li
Biomass-derived furfural and its derivatives are promising feedstocks for producing valuable C 5 diols by catalytic hydrolysis. However, this process requires selective ring opening of tetrahydrofurfuryl alcohol (THFA) to 1,5-pentanediol, which is challenging. Here we report efficient route for this conversion using Ni-La(OH) 3 catalysts prepared by a green co-precipitation-hydrothermal method. We show that these catalysts can achieve up to 91.7% yield and 94.6% selectivity of 1,5-pentanediol from THFA under mild conditions. We elucidate the key role of the La(OH) 3 phase, the basic sites and the Ni n+ -O-La 3+ structure of the catalysts in promoting the selective hydrogenolysis and ring opening of THFA. We also demonstrate that the co-dehydrogenation of secondary alcohols enables lower reaction pressure and longer catalyst lifetime. Our work provides a sustainable and environmentally benign approach for producing 1,5-pentanediol from biomass-based furfural and its derivatives, which has potential applications in polymer synthesis and green chemistry.
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高影响因子
Journal of Environmental Chemical Engineering
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2020
·
IF 4.3
Yi Cheng,Jilin Zhang
Excessive phosphate in wastewater can cause eutrophication of water body, which will worsen the ecological environment and threaten human health and biological life safety. Adsorption of phosphate is the most effective way to remove phosphate, and efficient adsorbent is the key. Amorphous La(OH) 3 has been deemed as a potential phosphate adsorbent on account of high adsorption capacity and environmentally friendly property. However, it also shows some disadvantages such as easy agglomeration, poor water dispersion. In this study, UiO-66-NH 2 was used as carrier to load amorphous lanthanum hydroxide as an adsorbent for phosphate removal. The adsorbent (UiO-66-NH 2 @La(OH) 3 , ULCs) has good water dispersibility and it is easy to be separated and recovered. At the same time, the maximum phosphate adsorption capacity can reach 140.7 mg P/g. The adsorption process accords with pseudo second order kinetic model and Freundlich isotherm model. The thermodynamic results showed that the adsorption process was spontaneous and endothermic. In addition, in the presence of coexisting anions (such as Cl − , SO 4 2− , NO 3 − ), it also exhibited high selectivity and phosphate removal efficiency. Meanwhile, the adsorption capacity keeps at a high level in the range of pH 3–11. By the merit of above-mentioned properties, the prepared material is expected to be an ideal candidate for phosphate removal from contaminated water.
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高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Chunlong Qiu,Haiyang Sun,Yeyang Ni,Zhenjiang Dou,Ming Xia,Zhaoyang Fei,Zhuxiu Zhang,Mifen Cui,Qing Liu,Xu Qiao
The impressive water stability demonstrated by MIL-101(Cr) highlights its considerable potential for the effective elimination of organic contaminants from wastewater. Nevertheless, the limited availability of adsorption sites within MOFs leads to an unsatisfactory capacity for tetracycline (TC) adsorption. In this case, the lanthanum modified MIL-101(Cr) porous adsorbents, termed as nLa-MIL-101(Cr), were successfully synthesized using a post-synthetic modification method. Through various characterization analyses, it was confirmed that lanthanum exists in the form of La(OH) 3 within the adsorbents, and all adsorbents also preserved the original structure as MIL-101(Cr). The results of static adsorption experiments demonstrated that, compared to the original material, the adsorption capacity of 1La-MIL-101(Cr) for TC increased by 3.5 times. Further experiments demonstrated that the adsorbent exhibits remarkable ion interference resistance and cycle stability. Finally, based on X-ray photoelectron spectroscopy, the adsorption mechanism was primarily attributed to the coordination between TC molecules and metals active site, while electrostatic interactions also played a significant role in the process. This study has developed a highly efficient adsorbent for the treatment of TC-contaminated wastewater, which reflects promising practical application prospects.
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高影响因子
Materials Research Express
·
2021
·Vol. 8
·期 10
·105002
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IF 1.62
Wenchang Xi,Pan Jian,Xisong Mao,Deyang Ning,Xuewen Xia,Guohua Liu,Dongyang Shi,Yuanpei Lan
In this work, aiming to evaluate and compare the luminescent property of Eu3+ doped La(OH)3 nanorods and its decomposed compounds of LaOOH and La2O3, La(OH)3: Eu3+ nanorods were synthesized and the decomposition behaviors in air and hydrogen were revealed. Then the luminescent property of 0%–8% Eu3+ doped La(OH)3 nanorods and the 300 °C–800 °C calcined La(OH)3: Eu3+- 4% were studied. Results show that LaOOH is intermediate product during the degradation of La(OH)3 in air or H2, which can be formed at a temperature range in 372.3 °C–592.9 °C in air. Intensity of emission spectra of La(OH)3: Eu3+ nanorods increases with the rising of Eu3+ dopant concentration, and the emission property of Eu3+ doped LaOOH and La2O3 is varied and strengthened with that of La(OH)3: Eu3+. Luminescent matrixes of LaOOH and La2O3 show similar emission spectrum and intensity, and the transitions of the D0 → 7F1 and D0 → 7F2 of Eu3+ each bifurcate into two peaks for both europium (III) doped La2O3 and LaOOH. The revealed results suggest that LaOOH is a relative thermal-stable compound and should be an appropriate matrix as similar as La2O3 for luminescent applications.
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Polymers
·
2023
·Vol. 15
·期 1
·248
·
IF 5
Yao Lu,Xuna Jin,Xiang Li,Minpeng Liu,Baolei Liu,Xiaodan Zeng,Jie Chen,Zhigang Liu,Shihua Yu,Yucheng Xu
Superparamagnetic Fe3O4particles have been synthesized by solvothermal method, and a layer of dense silica sol polymer is coated on the surface prepared by sol-gel technique; then La(OH)3covered the surface of silica sol polymer in an irregular shape by controlled in situ growth technology. These magnetic materials are characterized by TEM, FT-IR, XRD, SEM, EDS and VSM; the results show that La(OH)3nanoparticles have successfully modified on Fe3O4surface. The prepared Fe3O4@La(OH)3inorganic polymer has been used as adsorbent to remove phosphate efficiently. The effects of solution pH, adsorbent dosage and co-existing ions on phosphate removal are investigated. Moreover, the adsorption kinetic equation and isothermal model are used to describe the adsorption performance of Fe3O4@La(OH)3. It was observed that Fe3O4@La(OH)3exhibits a fast equilibrium time of 20 min, high phosphate removal rate (>95.7%), high sorption capacity of 63.72 mgP/g, excellent selectivity for phosphate in the presence of competing ions, under the conditions of phosphate concentration 30 mgP/L, pH = 7, adsorbent dose 0.6 g/L and room temperature. The phosphate adsorption process by Fe3O4@La(OH)3is best described by the pseudo-second-order equation and Langmuir isotherm model. Furthermore, the real samples and reusability experiment indicate that Fe3O4@La(OH)3could be regenerated after desorption, and 92.78% phosphate removing remained after five cycles. Therefore, La(OH)3nanoparticles deposited on the surface of monodisperse Fe3O4microspheres have been synthesized for the first time by a controlled in-situ growth method. Experiments have proved that Fe3O4@La(OH)3particles with fast separability, large adsorption capacity and easy reusability can be used as a promising material in the treatment of phosphate wastewater or organic pollutants containing phosphoric acid functional group.Keywords:superparamagnetic;Fe3O4@La(OH)3inorganic polymer;phosphate adsorption
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Changsong Li,Yijing Li,Qiang Li,Junling Duan,Juying Hou,Qin Hou,Shiyun Ai,Houshen Li,Yuechao Yang
Phosphates and organophosphorus cause environmental pollution , and excessive phosphate leads to water eutrophication . Glyphosate , an organophosphorus herbicide, harms the environment and human health. In this study, regenerable magnetic AL/Fe 3 O 4 /La(OH) 3 adsorbents were developed by modifying Fe 3 O 4 and La(OH) 3 on aminated lignin (AL) for phosphate and glyphosate removal. The adsorption capacity for phosphate and glyphosate reached 60.36 mg g −1 and 83.87 mg g −1 when the initial concentrations were 150 mg L −1 and 250 mg L −1 , respectively. The thermodynamic data showed that adsorption is a spontaneous and endothermic process. Adsorption can be applied at pH values ranging from 3 to 11 and is more suitable under acidic conditions. Fe 3 O 4 and La(OH) 3 both enhanced the adsorption capacities of phosphate and glyphosate. Phosphate and glyphosate compete slightly when coexisting in the adsorption process at low concentrations. Due to the magnetic properties of Fe 3 O 4 , the adsorbents can be separated rapidly and effectively with an external magnetic field. 89% adsorption capacity remained after four adsorption-desorption recycles. Thus, AL/Fe 3 O 4 /La(OH) 3 shows potential for phosphate and glyphosate removal as an effective and reusable adsorbent.
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高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2021
·Vol. 127
·期 2
·1-11
·
IF 2.584
Hu Shuting,He Junfeng,Chen Fuming,Liu Bin,zhai Wangjian,He Qinyu
Constructing Z-scheme heterojunction photocatalyst with strong redox ability to make for enhanced photocatalytic performance and efficient charge separation is extremely attractive but still underdeveloped. Herein, a Z-scheme heterojunction structured La(OH) 3 @In 2 S 3 composite (labeled by “LIS”) with photocatalytic for the methylene orange (MO) degradation under simulated light irradiation has been developed. The as-prepared LIS, together with commercial La(OH) 3 and pure In 2 S 3 fabricated with the identical processing method and starting materials as those of LIS, was characterized by X-ray diffraction, UV–vis diffuse reflectance spectra, scanning electron microscopy, high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, photoluminescence spectra and electrochemical impedance spectroscopy. The results show the heterojunction of La(OH) 3 /In 2 S 3 has prolonged the lifetime of the photo-generated carriers. The photocatalytic activity test shows that over only a small amount (0.02 g in 100 ml MO) of LIS, the photodegradation rate of 95% toward MO can be obtained in 90 min, which is about 3.4 times higher than that over pure In 2 S 3 . The active species trapping experiments indicate that there were four active species playing roles in photodegradation as the following order: e – = ∙OH < h + < ∙O 2 – . A mechanism of Z-scheme heterojunction was proposed and well explained the enhanced photocatalytic performance. This work provides a new cost-effective photocatalyst with high photocatalytic properties.
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