SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Aixia Chen,Luxue Lv,Ruirui Hu,Xiao Wei,Juanjuan Guan,Xin Meng
Breaking the technical bottleneck of traditional powdered adsorbent in phosphate adsorption application treatment, a macroscopic high adsorption performance aluminum sludge-based composite hydrogel material was constructed to synergistically solve the problems of water eutrophication and aluminum sludge resourcization. In this study, porous Ce-modified aluminum sludge hydrogel microspheres (Ce-AlS-SA) were prepared to improve the surface chemical structure and microscopic morphology of the macroscopic adsorbent material to enhance the adsorption capacity and achieve effective solid-liquid separation. The best adsorption performance of the material (Ce-AlS 12 -SA 1 ) was obtained when the Ce-AlS: SA : Na 2 CO 3 was 12:1:1, and obtained the optimal adsorption conditions by Response Surface Method (RSM) with 1.5 mg/L of the dosage, 4 of pH and 50 mg/L of C phosphate . The maximum adsorption of 20.36 mg P/g was obtained by the Langmuir model at 303 K, which was 2.92 times more than raw sludge. According to the Freundlich and pseudo-second-order kinetic model, the adsorption process is chemisorption ; the multi-stage adsorption process is reflected in the intraparticle diffusion and film diffusion models. The main mechanisms combined with the characterization analysis are electrostatic gravity, ligand exchange , and inner-sphere complexation. Meanwhile, Ce-AlS 12 -SA 1 shows good resistance to interference in the coexistence of multiple ions. Therefore, this material can be recognized as a new material with in-depth, diversified and practical needs for resourceful utilization, which is expected to achieve extensive engineering applications in the future.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 19
·54628-54643
·
IF 5.8
Chen Aixia,Guan Juanjuan,Hu Ruirui,Wei Xiao,Zhang Yixuan,Lv Luxue,Wang Xinyuan,Zhang Lei,Ji Luqian
To solve the problems such as water eutrophication caused by excess phosphorus, the potential residual value of aluminum sludge was fully exploited and its phosphate adsorption capacity was further improved. In this study, twelve metal-modified aluminum sludge materials were prepared by co-precipitation method. Among them, Ce-WTR, La-WTR, Y-WTR, Zr-WTR, and Zn-WTR showed excellent adsorption capacity for phosphate. The adsorption performance of Ce-WTR on phosphate was twice that of the native sludge. The enhanced adsorption mechanism of metal modification on phosphate was investigated. The characterization results showed that the increase in specific surface area after metal modification was 9.64, 7.5, 7.29, 3, and 1.5 times, respectively. The adsorption of phosphate by WTR and Zn-WTR was in the accordance with Langmuir model, while the others were more following the Freundlich model ( R 2 > 0.991). The effects of dosage, pH, and anion on phosphate adsorption were investigated. The surface hydroxyl groups and metal (hydrogen) oxides played an important role in the adsorption process. The adsorption mechanism involves physical adsorption, electrostatic attraction, ligand exchange, and hydrogen bonding. This study provides new ideas for the resource utilization of aluminum sludge and theoretical support for preparing novel adsorbents for efficient phosphate removal. Graphical abstract
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 8
·12052-12070
·
IF 0
Chen Aixia,Wang Xinyuan,Hu Ruirui,Wei Xiao,Lv Luxue,Shen Tong,Wang Jinzhou,Xing Shanshan,Yuan Chunbo
An aluminum sludge-based composite material was constructed against the problems of phosphorus pollution and the waste of aluminum sludge resources. Utilizing metal Ce doping and hydrogel microbeads with pore preparation, the adsorption performance of the original sludge was improved. Meanwhile, the macroscopic body was constructed, and on this basis, polyethyleneimine (PEI) was introduced to complete the amino functionalization further to enhance the adsorption of phosphorus by the adsorbent, and NH-CeAIS-10 microbeads were successfully prepared. In adsorption, microbeads with larger specific surface area and richer functional groups are better choice compared to original sludge. The results of SEM, BET, FT-IR, and XPS analyses indicate that the adsorption of phosphorus by the microbeads is mainly achieved through electrostatic interactions, ligand exchange, and the formation of inner-sphere complexes. According to the Langmuir model, the maximum phosphorus adsorption capacity of NH-CeAIS-10 was 29.56 mg g −1 , which was four times higher compared to native aluminum sludge. This also confirms the significant enhancement of phosphorus adsorption through the modification of aluminum sludge. Besides, in dynamic adsorption column experiments, the material exhibited up to 99% removal in simulated wastewater for up to 30 days, demonstrating the great adsorption potential of NH-CeAIS-10 in engineering applications. Graphical
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2025
·
IF 7.8
Yidan Luo,Huiming Wang,Wenjun Zeng,Zugen Liu,Xianchuan Xie
The management of alum sludge in waterworks has received a large amounts of attention. Considering its high aluminum and silicon content, alum sludge holds great potential as a low-cost raw material for zeolite synthesis to decrease the waste disposal. Alum sludge was utilized to synthesize zeolite A via both fusion-hydrothermal (Fusion-HT) and conventional hydrothermal methods. The synthesis parameters were explored including the Si/Al ratio, the calcination temperature, NaOH amounts, and hydrothermal temperature and time. The zeolite A prepared with Fusion-HT method exhibited a relative crystallinity of 93.15 % and a specific surface area of 128.01 m 2 /g. In adsorption experiments, zeolite A demonstrated excellent maximum adsorption capacities according to the Langmuir model for Cd 2+ , Cu 2+ , NH 4 + , and PO 4 3- , reaching 103.324, 93.899, 38.461, and 6.062 mg/g, respectively. Influential factors such as adsorbent dosage, pH, and humic acid (HA) were investigated. Zeolite A revealed optimal adsorption pH for various ions: Cu 2+ and Cd 2+ exhibited maximum removal efficiencies at pH 3–7, NH 4 + achieved peak adsorption capacity at pH 4–7, and PO 4 3- showed the highest adsorption efficacy at pH 4–6. Besides, the removal trends of Cd 2+ , NH 4 + , and PO 4 3- were negatively correlated with the HA concentration, while the removal rates of Cu 2+ increased first and then decreased. The different removal mechanisms were identified for Cd 2+ , Cu 2+ , NH 4 + , and PO 4 3- . Additionally, zeolite A could be regenerated with over 90 % of Cd 2+ removal efficiency after five cycles, highlighting its great potential in the treatment of urban non-point source pollution.
研究领域:
环境工程
·
材料科学
·
水污染控制
·
吸附技术
·
废弃物资源化利用
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）