CHEMOSPHERE
·
2022
·
IF 8.943
Peicheng Huang,Weichun Yang,Varney Edwin Johnson,Mengying Si,Feiping Zhao,Qi Liao,Changqing Su,Zhihui Yang
The contamination of soils by mercury (Hg) seriously threatens the local ecological environment and public health. S-functionalized amendments are common remediation technology , yet, Hg re-activation often occurs in the commonly used immobilization remediation by S-functionalized amendments, resulting in an unsatisfactory remediation effect. In this study, a novel FeS–Se functionalized biochar composite (FeS-Se-BC) amendment was prepared and applied for the efficient remediation of Hg-polluted soil. An immobilization efficiency of 99.62% and 99.22% for H 2 O-extractable Hg and TCLP solution-extractable Hg was achieved with the application of FeS-Se-BC (0.05) after 180 d. The analyses of XPS, Hg-TPD, SEM-EDS demonstrated that excellent remediation performance by FeS-Se-BC resulted from the synergistic effect of FeS and Se to form HgS and HgSe concurrently. In comparison to the treatments of biochar and FeS-functionalized biochar (FeS-BC), FeS-Se-BC promoted the transformation of exchangeable, carbonate-bound, and Fe–Mn oxides-bound Hg fractions into organic material-bound, and residual fractions, effectively reducing the risk of Hg-contaminated soil from a highly dangerous level to a low risk. Furthermore, the introduction of Se clearly inhibited the re-activation of Hg and reduced the release of Hg by 81.12% compared to FeS-BC when the ratio of S 2− to Hg was 5: 1 due to the formation of extremely stable HgSe. These results suggest that FeS-Se-BC has good potential for remediation of Hg-polluted soils which provides a new inhibitory idea for Hg re-activation after immobilization.
研究领域:
环境科学
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土壤修复
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 32
·期 52
·2209391
·
IF 19.924
Hongjie Zhang,Wenhuai Zhuge,Feng Yang,Lixing Kang,Shuchen Zhang,Ran Du,Jinjie Qian,Zhi Yang,Yagang Yao,Pan Li,Yue Hu,Jin Zhang
High-density single-walled carbon nanotube (SWNT) arrays with specific diameters are pursued as potential building blocks in future nanoelectronic devices. The direct growth of SWNT arrays on the single-crystal substrate has proved offering densely packing high-quality SWNTs. However, further increase of SWNT density is limited by the deactivation of the catalyst nanoparticles during chemical vapor deposition process. Moreover, an increase of array density without any structure control of SWNTs would make the benefit effect very limited. Here, a temperature-mediated method is proposed to achieve a high-density SWNT array with a specific diameter via continual growth of SWNTs after reactivating poisoned catalysts with high carbon capacity and appropriate size. The density of obtained SWNT array on the quartz substrate is increased by more than three times, with diameter distribution controlled ≈2 nm. This approach paves the way for the integration of SWNTs into nanodevices.
研究领域:
纳米材料科学
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半导体器件物理
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表面与界面工程
·
功能材料制备
·
微纳电子学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 43
·30217-30229
·
IF 3.9
Shutao Lin,Ruiting Chang,Xinyu Cao,Yongheng Zhang,Jiabo Chen,Wenchao Jiang,Zhi Zhang
Poly(vinyl alcohol) (PVA)/modified porous starch (MPS) gel beads were prepared through in situ chemical cross-linking by incorporating with MPS, which was obtained by modifying porous starch (PS) with polyethyleneimine (PEI) and glutaraldehyde (GA). Addition of MPS could improve the storage modulus and the effective crosslinking density (ve) of the gel beads, and the mechanical properties were enhanced. The PVA–MPS gel beads were preserved as immobilized microbial carriers for 40 d and reactivated in wastewater. Scanning electron microscope (SEM) observations showed that the beads were highly porous and conducive for microorganism adhesion. The PVA–MPS gel beads were able to remove 97% of ammonia nitrogen and 80% of chemical oxygen demand (COD) after reactivation under all four preservation conditions. The abundance of Hydrogenophaga as denitrifying bacteria on PVA–MPS gel beads increased, with abundance of 8.44%, 5.55%, 8.90% and 9.48%, respectively. It proved that the carrier provided a partial hypoxic environment for microorganisms.
研究领域:
环境工程
·
微生物学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small
·
2023
·Vol. 19
·期 23
·2300106
·
IF 13.3
Ziqin Liu,Xin Dong,Jing Wen,Pu Hu,Chaoqun Shang
The high reactivity of Li metal and the inhomogeneous Li deposition leads to the formation of Li dendrites and “dead” Li, which impedes the performance of Li metal batteries (LMBs) with high energy density. The regulating and guiding the Li dendrite nucleation is a desirable tactic to realize concentrated distribution of Li dendrites instead of completely inhibiting dendrite formation. Here, a Fe-Co-based Prussian blue analog with hollow and open framework (H-PBA) is employed to modify the commercial polypropylene separator (PP@H-PBA). This functional PP@H-PBA can guide the lithium dendrite growth to form uniform lithium deposition and activate the inactive Li. In details, the H-PBA with macroporous structure and open framework can induce the growth of lithium dendrites via space confinement, while the positive Fe/Co-sites lowered by polar cyanide (−CN) of PBA can reactivate the inactive Li. Thus, the Li|PP@H-PBA|Li symmetric cells exhibit long-term stability at 1 mA cm −2 for 1 mAh cm −2 over 500 h. And the Li-S batteries with PP@H-PBA deliver favorable cycling performance at 500 mA g −1 for 200 cycles.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）