ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2023
·Vol. 30
·期 19
·55009-55023
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IF 5.8
Cheng Fulong,Nie Fangui,Fan Yuting,Huang Dan,Wang Yinian,Fan Jianxin
Phosphorus removal from wastewater has been considered as an effective method to control eutrophication and mitigate phosphorus deficiency. Phosphate adsorption using lanthanum-based materials has awakened much attention and triggered extensive research. In this study, novel flower-like LaCO 3 OH materials were synthesized via a one-step hydrothermal method and evaluated for phosphate removal from wastewater. The adsorbent with flower-like structures prepared at the hydrothermal reaction time of 4.5 h (BLC-4.5) exhibited the optimum adsorption performance. BLC-4.5 had a rapid removal rate with more than 80% of the saturated adsorbed phosphate removed within 20 min. Furthermore, the maximum phosphate adsorption capacity of BLC-4.5 was as high as 228.5 mg/g. Notably, the La leaching amount of BLC-4.5 was negligible in the pH range of 3.0–11.0. BLC-4.5 outperformed most of the reported La-based adsorbents in terms of removal rate, adsorption capacity, and La leaching amount. Moreover, BLC-4.5 had broad pH adaptability (3.0–11.0) and high selectivity for phosphate. BLC-4.5 also displayed excellent phosphate removal efficiency in actual wastewater and great recyclability. The potential adsorption mechanisms of phosphate on BLC-4.5 were precipitation, electrostatic attraction, and inner-sphere complexation via ligand exchange. This study demonstrates that the newly developed flower-like BLC-4.5 reported here is a promising adsorbent for the effective treatment of phosphate in wastewater.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
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IF 9
Zhuolin Qing,Zetong Li,Zifan Zhong,Hang Zhong,Qirui Qin,Zekun Yang,Xin Yang,Junmin Chen
Lanthanum (La)-based hydroxide materials are considered promising candidates for phosphate removal, but their adsorption efficiency is often limited by the hydroxide (OH – ) release and slow mass transfer. In this study, we synthesized lanthanum hydroxyl carbonate supported onto magnetic porous biochar (La-FPBC 0.5 ) for advanced phosphate removal from actual secondary effluent of wastewater. La-FPBC 0.5 significantly enhanced phosphate removal by releasing more carbonate (CO 3 2– ) rather than hydroxy (–OH) during adsorption. Density functional theory calculations revealed that the absolute value of absorb adsorption energy for ion exchange in La-FPBC 0.5 is 4.48 eV, higher than that for ligand exchange (3.11 eV). The adsorption kinetic rate constant of La-FPBC 0.5 reached 1.7 × 10 -3 g/(mg −1 min), which is 1.8 times that of La(CO 3 )(OH). Furthermore, La-FPBC 0.5 removed up to 151.5 mg P/g of phosphate from wastewater, representing a 1.6-fold increase compared to La(CO 3 )(OH), surpassing not only commercial La-based materials but also most reported adsorbents. It maintained over 85 % of its phosphate adsorption capacity in the presence of anions or humic acid and showed effective adsorption across various water sources, including river, campus lake, and tap water, with a capacity exceeding 120 mg P/g. La-FPBC 0.5 also exhibited excellent stability, retaining 95 % of its capacity after five adsorption–desorption cycles. Notably, La-FPBC 0.5 treated approximately 1800 bed volumes of phosphate-containing wastewater to below 0.1 mg/L in a fixed-bed adsorption mode, with the recovered phosphate suitable for plant growth. These results suggest that La-FPBC 0.5 is an ideal candidate for phosphate removal in practical applications.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Quanli Hu,Bin Yue,Hongyang Shao,Fan Yang,Jinghui Wang,Yin Wang,Jinghai Liu
Lanthanum-based LaMO 3 (M = Fe, Co, Ni) perovskite nanofibers were effectively fabricated by electrospinning approach coupled with calcination process. The crystallinity, microstructures, morphologies, elemental compositions, and chemical bonding states of LaMO 3 perovskites were investigated in detail. The electrochemical properties of LaMO 3 perovskite nanofibers as supercapacitor electrodes and lithium-ion battery anodes were elucidated. The specific capacitances of LaFeO 3 , LaCoO 3 , and LaNiO 3 nanofibers were 183.6, 95.8 and 116.3 F g −1 at the current density of 1 A g −1 , respectively. The supercapacitive properties of LaMO 3 NFs had originated from the redox reactions of M 3+ /M 2+ . As lithium-ion battery anodes, LaMO 3 (M = Fe, Co, Ni) nanofibers exhibited the specific discharge capacities of 331, 646, and 92 mAh g −1 after 200 cycles, respectively. This research endowed the potential and competent candidates of the perovskite type lanthanum-based nanofibers for supercapacitor electrodes and lithium-ion battery anodes.
研究领域:
材料科学
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能源存储与转换
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Jing Su,Tao Lyu,Hao Yi,Lei Bi,Gang Pan
A major challenge for effective decontamination of arsenate from aqueous solution is the development of adsorbent possessing enormous high-active sites with strong affinity to realize both high adsorption capacity and reduction of arsenate down to permissive levels. Here we demonstrate that this challenge may be overcome by doping Mn atoms into La 2 O 2 CO 3 materials. The synthesized material (5.26%-MnL) achieved an arsenate capture ability superior to most other currently-reported adsorbents, with the maximum adsorption capacity of 555.6 mg/g. Additionally, this novel adsorbent could dramatically reduce the concentration of arsenate from 3775 μg/L to less than 4 μg/L, well below the acceptable value for drinking water (10 μg/L). The adsorption capacity of 5.26%-MnL was demonstrated to be >300 mg/g over a wide pH range from 4 to 9 and the efficiency was maintained >85% even after three cycles of adsorption/desorption. Through a series of characterizations, both surface complexation and ion exchange were proved to contribute to arsenate removal at low molar ratios of As(V)/5.26%-MnL while forming LaAsO 4 precipitation played a greater role at higher As(V)/5.26%-MnL ratios. Density Functional Theory (DFT) calculations suggested that Mn atoms acted as active species by not only increasing lattice defects and adsorption sites, but also by activating La 3+ in La 2 O 2 CO 3 , which lowered the adsorption energy and facilitated arsenate removal. Due to the high affinity and superior adsorption capacity towards arsenate, Mn-doped La 2 O 2 CO 3 has been demonstrated to be a promising prospect for the remediation of arsenate-polluted water.
研究领域:
环境科学
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材料科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Yungui Li,Chenge Liang,Yi Shen,Wenhai Huang,Qingqing Li,Jining Liu,Jing Zhang,Peng Deng,Safdar Bashir,Qile Fang
La-based materials have garnered considerable attention as potential adsorbents for phosphate removal because they capture phosphate with high affinity, producing an ultralow phosphorous-concentration output. Herein, La-based metal–organic frameworks (La–MOFs, La-1,3,5-benzentricarboxylate) with tunable structures were fabricated by regulating the coordination solvent environment, which largely determines both the pore structure and chemical components of their corresponding La 2 O 2 CO 3 derivatives and the phosphate adsorption performance. A porous La 2 O 2 CO 3 derivative (W–D T500) derived from the water/N,N-dimethylformamide (DMF) guided La–MOF showed abundant mesopores and a high surface area, because the pore-opening degree under high-temperature pyrolysis is higher in W–D T500 than in the La 2 O 2 CO 3 derivative obtained from the water/ethanol solvent–guided La–MOF. W–D T500 also had higher La (78.3%) and carbonate contents of the crystal structure owing to the higher efficiency of carbon conversion to carbonate-oxides in W–D T500. Consequently, the porous La 2 O 2 CO 3 derivative W–D T500 exhibited superior phosphate adsorption capacity (91.6 mg P/g), high adsorption selectivity, and excellent recycling performance. Phosphate was attached to the La 2 O 2 CO 3 adsorbents via a ligand-exchange mechanism between phosphate and CO 3 2− /–OH. This study provides a solvent guidance strategy to construct functional La–MOFs and La 2 O 2 CO 3 derivatives for excellent phosphate removal.
研究领域:
环境科学
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材料科学
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化学工程
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产品关联
DOI
高影响因子
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