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A functionalized activated carbon adsorbent prepared from waste amidoxime resin by modifying with H_(3)PO_(4) and ZnCl_(2) and its excellent Cr(Ⅵ)adsorption

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International Journal of Minerals,Metallurgy and Materials 2024年第3期31卷 585-598页

作者： Chunlin He Yun Liu Mingwei Qi Zunzhang Liu Yuezhou Wei Toyohisa fujita Guifang Wang Shaojian Ma Wenchao Yang School of Resources Environment and MaterialsGuangxi UniversityNanning 530004China State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures Guangxi UniversityNanning 530004China School of Nuclear Science and Technology University of South ChinaHengyang 421000China School of Nuclear Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China Key Laboratory of New Low-carbon Green Chemical Technology Education Department of Guangxi Zhuang Autonomous RegionNanning 530004China

With the application of resins in various fields, numerous waste resins that are difficult to treat have been produced. The industrial wastewater containing Cr(Ⅵ) has severely polluted soil and groundwater environments, thereby endangering human health. Therefore, in this paper, a novel functionalized mesoporous adsorbent PPR-Z was synthesized from waste amidoxime resin for adsorbing Cr(Ⅵ). The waste amidoxime resin was first modified with H3PO4 and ZnCl_(2), and subsequently, it was carbonized through slow thermal decomposition. The static adsorption of PPR-Z conforms to the pseudo-second-order kinetic model and Langmuir isotherm, indicating that the Cr(Ⅵ) adsorption by PPR-Z is mostly chemical adsorption and exhibits single-layer adsorption. The saturated adsorption capacity of the adsorbent for Cr(Ⅵ) could reach 255.86 mg/g. The adsorbent could effectively reduce Cr(Ⅵ) to Cr(Ⅲ) and decrease the toxicity of Cr(Ⅵ) during adsorption. PPR-Z exhibited Cr(Ⅵ) selectivity in electroplating wastewater. The main mechanisms involved in the Cr(Ⅵ) adsorption are the chemical reduction of Cr(Ⅵ) into Cr(Ⅲ) and electrostatic and coordination interactions. Preparation of PPR-Z not only solves the problem of waste resin treatment but also effectively controls Cr(Ⅵ) pollution and realizes the concept of “treating waste with waste”.

关键词： waste amidoxime resin mesoporous adsorbent H_(3)PO_(4)and ZnCl_(2)processing Cr(VI)adsorption electroplating wastewater

Preparation of Chiral Hydroxy Esters Using Actinobacteria: Biocatalyst Activity of Marine-Derived <i>Micromonospora</i>and <i>Streptomyces</i>Strains

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Open Journal of Applied Sciences 2013年第1期3卷 116-122页

作者： Kohji Ishihara aiko fujita Akane Sakiyama Yuko Kobayashi Kaoru Hori Kanako Maruike Noriyoshi Masuoka Nobuyoshi Nakajima Hiroki Hamada Department of Life Science Okayama University of Science Okayama Japan Graduate School of Health and Welfare Okayama Prefectural University Soja Japan

To research the potential ability of marine-derived actinomycetes to act as biocatalysts, 8 Micromonospora strains and 5 Streptomyces strains were screened. Two recommended media (227 and 1076 media) and 2 modified media (1076-25% and P-1076-25% media) for liquid culture of these marine-derived actinomycetes were tested. As a result, 2 Micromonospora strains (Micromonospora sp. NBRC107096 and 107097) cultured with the 1076-25% medium and 2 Streptomyces strains (Streptomyces tateyamensis NBRC105048 and Streptomyces sp. NBRC105896) cultured with P-1076-25% medium showed a good growth. The stereoselective reduction of α-keto esters using these 4 actinomycetes was tested. As a result, it was found that these strains had a reducing activity toward various α-keto esters. The introduction of L-glutamate or sucrose as an additive remarkably increased the conversion ratios in the reduction of substrates by the Micromonospora strain. Furthermore, in the presence of L-alanine, Streptomyces tateyamensis NBRC105048 reduced ethyl pyruvate, ethyl 2-oxobutanoate, ethyl 2-oxopentanoate, ethyl 2-oxohexanoate, and ethyl 3-methyl-2-oxobutyrate to the corresponding α-hydroxy ester with a high conversion ratio and with excellent enantiomeric excess. Thus, we found that these marine-derived actinomycetes have great potential to be used as biocatalysts for stereoselective reduction of carbonyl compounds.

关键词： Marine Bacteria Micromonospora Streptomyces Biocatalyst Chiral Alcohol

Bi_(2)O_(3)/g-C_(3)N_(4)hollow core–shell Z-scheme heterojunction for photocatalytic uranium extraction

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Nano Research 2024年第7期17卷 5845-5855页

作者： Hao Fu Yuehua Pan Zhenyu Cai Yuxiang Deng Minchen Hou Yuezhou Wei Toyohisa fujita Shunyan Ning Youbin Wang Shaolong Zhang Xinpeng Wang School of Chemistry&Chemical Engineering Guangxi UniversityNanning 530004China School of Resources Environment and MaterialsGuangxi UniversityState Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite StructuresNanning 530004China College of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen 518060China School of Materials Sun Yat-sen UniversityShenzhen 518107China School of Nuclear Science and Technology University of South ChinaHengyang 421001China

Photocatalytic uranium extraction from radioactive nuclear wastewater and seawater is critical for promoting the sustainable advancement of nuclear industry,but the complexity of real-world environments,particularly the occurrence of anoxic and oxygen-enriched states,presents significant challenges to effective uranium ***,a layered hollow core–shell structure of Bi_(2)O_(3)/g-C_(3)N_(4)Z-scheme heterojunction photocatalyst has been designed and successfully applied for photocatalytic uranium extraction in both aerobic and oxygen-free conditions,and the extraction efficiency of uranium can reach 98.4%and 99.0%,***,the photocatalyst still has ultra-high extraction efficiency under the influence of pH,inorganic ions,and other *** exceptional capability for uranium extraction is on the one hand due to the distinctive hollow core–shell architecture,which furnishes an abundant quantity of active *** the other hand,benefiting from the suitable band gap structure brought by the construction of Z-scheme heterojunction,Bi_(2)O_(3)/g-C_(3)N_(4)exhibits current densities(1.00μA/cm^(2))that are 5.26 and 3.85 times greater than Bi_(2)O_(3)and g-C_(3)N_(4),respectively,and the directional migration mode of Z-scheme carriers significantly prolongs the lifetime of photogenerated charges(1.53 ns),which separately surpass the pure samples by factors of 5.10 and ***,the reaction mechanism and reaction process of photocatalytic uranium extraction are investigated in the presence and absence of oxygen,respectively.

关键词： Bi_(2)O_(3)/g-C_(3)N_(4) Z-scheme photocatalytic uranium extraction

Analyzing Disaster Mitigation Policies in Japan and China from an Eco-DRR Perspective:A Comparative Study of Shanghai and Tokyo

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Journal of Architectural Research and Development 2024年第1期8卷 14-19页

作者： Minghui Tang Naoko fujita Art and Design University of TsukubaTsukuba 3058577IbarakiJapan

Global climate change-induced natural disasters require international efforts and the adoption of Eco-Disaster Risk Reduction(Eco-DRR)policies for sustainable *** study examines the status of Eco-DRR in disaster prevention policies through word cloud analysis,providing insights for policymakers to enhance disaster prevention amid increasing climate-related *** and Japan prioritize soft aspects,while Shanghai and China emphasize engineering for flood prevention,revealing a gap in Eco-DRR *** these differing approaches,the shared focus on water-related disasters indicates a shift towards urban *** research should assess policy effectiveness and the impact of Eco-DRR on disaster risk reduction and ecosystem protection.

关键词： Disaster Policy Eco-DRR Word-cloud

Light is an Important Limiting Factor for the Vertical Distribution of the Largest Extant Benthic Foraminifer Cycloclypeus carpenteri

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Journal of Earth Science 2022年第6期33卷 1460-1468页

作者： Kazuhiko fujita Yoji Kanda Takashi Hosono Department of Physics and Earth Sciences University of the RyukyusOkinawa903-0213Japan Tropical Biosphere Research Center University of the RyukyusOkinawa903-0213Japan Japan Agency for Marine-Earth Science and Technology(JAMSTEC) Global Oceanographic Data Center(GODAC)Kanagawa236-0001Japan

Cycloclypeus carpenteri is the largest extant benthic foraminifer,dwelling in the deep euphotic zone(a water depth between 60 and 130 m)of the warm oligotrophic Indo-West *** foraminifer harbors diatom endosymbionts and the foraminifer-microalgal association acts like a *** verify that light is an important limiting factor controlling the vertical(depth)distribution of living Cycloclypeus holobionts,their physiological responses to light intensity were examined by short-term metabolic measurements and long-term *** oxygen production(OP)rates measured under different light levels using an oxygen microelectrode indicate that Cycloclypeus holobionts are daily net primary producers adapted to low light levels,with slight photoinhibition(reduced net OP rates relative to a light-saturated rate)over 100μmol photons m^(−2)s^(−1).Long-term growth increments of asexually reproduced juveniles incubated for two months at different light levels ranging from 0 to 100μmol photons m^(−2)s^(−1) show that Cycloclypeus holobionts are adapted to a low light level(∼5μmol photons m^(−2)s^(−1)),but can be acclimatized to a certain low light ranges(<50μmol photons m^(−2)s^(−1)).These experimental results confirm that light is an important environmental gradient affecting the vertical distribution of Cycloclypeus holobionts.

关键词： algal symbiosis diatom large benthic foraminifer oxygen production photosynthesis

Interactive Restoration of Three-Dimensional Implicit Surface with Irregular Parts

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Computer Modeling in Engineering & Sciences 2023年第9期136卷 2111-2125页

作者： Jiayu Ren Yoshihisa fujita Susumu Nakata Graduate School of Information Science and Engineering Ritsumeikan UniversityShiga525-8577Japan College of Information Science and Engineering Ritsumeikan UniversityShiga525-8577Japan

Implicit surface generation based on the interpolation of surface points is one of the well-known modeling methods in the area of computer *** methods for the implicit surface reconstruction from surface points have been proposed on the basis of radial basis functions,a weighted sum of local functions,splines,wavelets,and combinations of ***,if the surface points contain errors or are sparsely distributed,irregular components,such as curvature-shaped redundant bulges and unexpectedly generated high-frequency components,are commonly *** paper presents a framework for restoring irregular components generated on and around *** are assumed to specify local masks that cover irregular components and parameters that determine the degree of *** algorithm in this paper removes the defects based on the user-specific masks and *** have shown that the proposed methods can effectively remove redundant protrusions and jaggy noise.

关键词： Shape modeling implicit surfaces interactive restoration

Broadly tunable lens-coupled nonlinear quantum cascade lasers in the sub-THz to THz frequency range

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Photonics Research 2022年第3期10卷 703-710页

作者： Kazuue fujita Shohei Hayashi Akio Ito Tatsuo Dougakiuchi Masahiro Hitaka Atsushi Nakanishi Central Research Laboratory Hamamatsu Photonics K.K.5000 HirakuchiHamakita WardHamamatsu 434-8601Japan

Room-temperature terahertz(THz)quantum cascade laser sources with intracavity difference-frequency nonlinear mixing are electrically pumped monolithic semiconductor laser sources operating in the 0.6–6 THz spectral *** report widely tunable,low-frequency THz quantum cascade laser sources using a lens-coupled Cherenkov waveguide *** on a watt-class high-power,λ∼13.7μm quantum cascade laser,the monolithic THz source is strongly coupled with a high-resistivity silicon lens,which causes a major increase in the THz coupling efficiency and demonstrates significant performance improvements.A room-temperature 1.5 THz device produces a 0.2 mW peak output power with a high-quality beam *** THz outcoupling efficiency using the lens-coupled scheme enabled the demonstration of a high-performance external-cavity semiconductor THz source that is tunable from 420 GHz to 2 *** external-cavity,lens-coupled device configuration can technically be assembled into a butterfly-style package for a thumb-sized,widely frequency tunable THz semiconductor source.

关键词： tunable waveguide pumped

Disseminated carcinomatosis of the bone marrow caused by granulocyte colony-stimulating factor:A case report and review of literature

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World Journal of Gastrointestinal Oncology 2022年第10期14卷 2077-2084页

作者： Kengo fujita Ayaka Okubo Toshitsugu Nakamura Nobumichi Takeuchi Department of Medical Oncology Ina Central HospitalNagano 396-8555Japan Department of Diagnostic Pathology Ina Central HospitalNagano 396-8555Japan

BACKGROUND Disseminated carcinomatosis of the bone marrow(DCBM)is a widespread metastasis with a hematologic disorder that is mainly caused by gastric *** it commonly occurs as a manifestation of recurrence long after curative treatment,the precise mechanism of relapse from dormant status remains *** colony-stimulating factor(G-CSF)can promote cancer progression and invasion in various ***,the potential of G-CSF to trigger recurrence from a cured malignancy has not been *** SUMMARY A 55-year-old Japanese woman was diagnosed with Ewing sarcoma localized on the fifth lumbar vertebrae 6 years after curative gastrectomy for T1 gastric *** palliative surgery to release nerve compression,pathological diagnosis of the resected specimen was followed by curative radiation and *** treatment,G-CSF was administered 32 times for severe neutropenia *** months after completing definitive treatment,she complained of severe back pain and was diagnosed as multiple bone metastases with DCBM from gastric *** palliative chemotherapy,she died of disseminated intravascular coagulation 13 d after the *** examination of the autopsied bone marrow confirmed a diffuse positive staining for the G-CSF receptor(G-CSFR)in the relapsed gastric cancer cell cytoplasm,whereas the primary lesion cancer cells showed negative staining for *** this case,G-CSF administration may have been the key trigger for the disseminated relapse of a dormant gastric *** administering G-CSF to cancer survivors,recurrence of a preceding cancer should be monitored even after curative treatment.

关键词： Disseminated bone marrow carcinomatosis Gastric cancer Granulocyte colony-stimulating factor Cancer survivor Immunostaining Case report

原位重构限制在三维纳米孔铜内的铋纳米颗粒促电还原CO_(2)

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Science China Materials 2024年第3期67卷 796-803页

作者：赵秋玉王静庄严宫磊张薇宁樊唯镏鲁振张永政藤田武志张平薛其坤 School of Physics and Physical Engineering Qufu Normal UniversityQufu 273165China School of Chemistry and Chemical Engineering Shandong UniversityJinan 25010China Institute of Physics Chinese Academy of SciencesBeijing 100190China Advanced Institute for Materials Research Tohoku UniversitySendai 980-8577Japan School of Environmental Science and Engineering Kochi University of TechnologyKami 782-8502Japan

由于单金属Bi在CO_(2)还原反应(CO_(2)RR)中效率较低,通过表面工程复合材料提高电导率和产率是一种有吸引力的方法.在此,我们重构了在三维纳米孔铜结构中的原位生长金属Bi纳米颗粒.得益于三维纳米多孔导电网络和Cu与Bi之间的强相互作用,... 详细信息

由于单金属Bi在CO_(2)还原反应(CO_(2)RR)中效率较低,通过表面工程复合材料提高电导率和产率是一种有吸引力的方法.在此,我们重构了在三维纳米孔铜结构中的原位生长金属Bi纳米颗粒.得益于三维纳米多孔导电网络和Cu与Bi之间的强相互作用,Bi@np-Cu费米能级向上移动,表现出优异的电催化二氧化碳还原性能.Bi@np-Cu在-0.97 V的电位下具有97.7%的甲酸法拉第效率,电流密度为82 mA cm^(-2).重要的是,该催化剂在连续催化反应40 h后仍能实现超过90%的法拉第效率.DFT计算表明,np-Cu有效地调节了Bi的电子态,优化了中间吸附能,从而提高了Bi的本征活性.这项工作为纳米多孔金属在催化中的应用提供了一个新视角.

关键词： 3D nanoporous CO_(2)RR Bi nanoparticle electrocatalysis reconstruction

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