CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Qian Zhao,Guangyuan Chen,Zeru Wang,Mei Jiang,Jingruolan Lin,Ling Zhang,Lin Zhu,Tao Duan
Effectively remove radioactive iodine from aqueous solutions is highly desirable for the purpose of radioactive liquid waste treatment. However, anionic radioiodine species do not prefer to sorb on minerals or inorganic sorbents . Herein, we report a stable millimeter-level bismuth-based polymer composite beads (δ-Bi 2 O 3 @PES) with fast removal kinetics and high adsorption capacities for both iodide (I − ) and iodate (IO 3 − ). Abundant micro-flower-like δ-Bi 2 O 3 was embedded in the porous interconnection network of polymer composite beads, making it an effective adsorbent for removing radioactive iodine. δ-Bi 2 O 3 @PES composite beads showed high adsorption capacities of 95.4 mg/g and 170.6 mg/g for I − and IO 3 − by forming an insoluble Bi 4 I 2 O 5 and BiOIO 3 phase, respectively, which also can selectively remove iodine anions in the presence of large excesses of NO 3 – and SO 4 2− . Furthermore, δ-Bi 2 O 3 @PES composite beads can highly reduce the Bi 3+ leaching of δ-Bi 2 O 3 powder after immersed in the acid solution and can be easily separated from the liquid after sorption . The performance of δ-Bi 2 O 3 @PES in dynamic column experiments indicates that economical Bi-based composite bead is a promising candidate sorbent for environmental remediation of actual iodine-contaminated water.
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Small Methods
·
2021
·Vol. 5
·期 12
·2101072
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IF 14.188
Xiyue Xie,Zhenqiang Wang,Meizhen Zhou,Yuxin Xing,Yuhua Chen,Jixi Huang,Kaiyong Cai,Jixi Zhang
Electrochemical nanosensors by integrating functional nucleic acids and nanomaterials hold a great promise in the fast detection of biomarkers, yet the current systems possess limitations on the accessibility of target–probe and probe–electrode interactions and the repeatability of detection. Herein, a host–guest assembly strategy is developed to build redox nanosensors for an immobilization-free and ratiometric electrochemical detection system. Specifically, electroactive molecule ( E m ) guests are loaded in porous hosts of polydopamine nanoparticles (MPDA) to act as dual-signal redox reporters. Hybrid DNA probes of G-quadruplex and a single-stranded anchor DNA are installed as gatekeepers for sealing the mesopores. Thereby, miRNA triggered E m release by strand displacement reactions and the homogeneous transportation of the hosts/guests to the electrode facilitate the generation of reference signal/response signal at different potentials. Concomitantly applied NIR irradiation boosts the electron transfer from MPDA to the electrode and results in a tenfold increase in the reference signal. Finally, the sensing system through the differential pulse voltammetry method achieves a highly repeatable detection (relative standard deviation 3.8%) of miRNA with a lower detection limit (362 × 10 −15 m ). This attractive system paves the way for rational designs of advanced electrochemical biosensors and smart diagnosis.
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BIOCHEMICAL ENGINEERING JOURNAL
·
2021
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IF 3.978
Yumei Xiao,Yanxia Chen,Ruowei Lu,Yongchao Wang,Cuijuan Wang
A novel hierarchical magnetic zeolitic imidazolate framework-8 material (Hierarchical mZIF-8) is fabricated by using the cetyltrimethylammonium bromide (CTAB) and L -histidine (His) as templates. Comparing to usual magnetic ZIF-8 (mZIF-8), there are not only micropores (1.1 nm) but also new mesopores (23.3 nm) in hierarchical mZIF-8 material. It is the first time that Candida rugosa lipase (CRL) has been immobilized into hierarchical mZIF-8 with significantly higher enzyme loading capacity than mZIF-8. Furthermore, the temperature stability, pH stability and recycling convenience of immobilized CRL are all enhanced compared with free CRL.
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COLLOIDS AND SURFACES B-BIOINTERFACES
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2021
·
IF 5.268
Tongle Liu,Yuan Rao,Wenfeng Zhou,Wei Zhuang,Lei Ge,Rijia Lin,Wenxia Zhang,Jinglan Wu,Chenjie Zhu,Hanjie Ying
Adenylate cyclase (AC) can efficiently catalyze the conversion of adenosine triphosphate (ATP) to cyclic adenosine-3′, 5′-monophosphate (cAMP). However, AC directly immobilized on substrate is not desirable due to enzyme inactivation. Herein, bio-inspired adhesive of polydopamine and polyethyleneimine (PDA/PEI) was used as flexible chains to graft on graphene oxide (GO), and the AC was directionally immobilized through affinity between metal ions and his-tags of AC. The properties of modified GO and the activity of immobilized AC were studied in detail. PDA/PEI layers have been proved to improve the amino density of GO surface for affinity groups decoration and adjust the interaction between AC and support. And modified GO by this novel method contributes to subsequent grafting and immobilization of AC by affinity. AC immobilized on modified GO exhibited high activity recovery with about 90 % of free AC, while enzyme immobilized on unmodified GO has been inactivated. This study offers a versatile approach for support modification and enzyme oriented immobilization. PDA/PEI functionalized GO can be used as a promising carrier to immobilize other his-tagged enzymes.
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JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 16
·9644-9654
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IF 4.22
Ma Jiang,Fang Zhiwei,Yang Xiaoyong,Wang Bo,Luo Fen,Zhao Xiaoli,Wang Xiaofen,Yang Yushan
Ceramic matrix containing zirconolite, hollandite, and perovskite phases is proposed as a potential host for HLW immobilization. Hollandite phase principally immobilizes Cs, while perovskite phase mainly immobilizes Sr. In this study, hollandite–perovskite composite ceramics are considered as a specialized waste form for immobilizing the separated Cs and Sr from HLW streams and synthesized by a solid-state reaction method at 1300 °C for 5 h. The phase compositions of the synthesized composites were characterized by XRD and BSE. The XRD results indicated that the as-prepared ceramics are composed of tetragonal hollandite Ba 0.8 Cs 0.4 Al 2 Ti 6 O 16 , cubic perovskite SrTiO 3 , alongside a lesser amount of TiO 2 . The BSE—EDX results confirm that Cs partitions into the hollandite matrix, while Sr incorporates into perovskite host with homogenous distribution. In addition, aqueous durability testing was carried out using the MCC-1 static leach test method. The normalized release rates of Cs and Sr in HP-3 sample (i.e., 75 wt% Ba 0.8 Cs 0.4 Al 2 Ti 6 O 16 + 25 wt% SrTiO 3 ) were < 10 −2 g·m −2 ·d −1 after 42 days, exhibiting excellent chemical durability. These results indicate that the hollandite–perovskite ceramic matrix could be considered as a customized host matrix for immobilization of the separated Cs and Sr from HLW streams.
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JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Wenxin Liu,Zhaofan Tao,Duo Wang,Qianqian Liu,Yinan Zhang,Yanling Zhang,Alideertu Dong
The past several decades have witnessed tremendous research to discover ways for controlling heavy metal pollution, but most of the strategies do not involve reuse of the captured heavy metals. Herein, we propose a graphene oxide -based strategy for the effective removal of Cu 2+ ions from water, coupled with their reuse as an antibacterial agent. Using GO nanosheets as an adsorbent and nanosupport, the Cu 2+ ions were effectively extracted from water (>99.9%) and reduced in situ to copper nanoparticles (Cu NPs) containing both crystalline Cu and Cu 2 O. The as-captured Cu NPs showed efficient in vitro antibacterial ability against Escherichia coli , reducing the bacteria from 10 9 to 10 1 CFU mL –1 by using 1 mg mL –1 Cu NPs/GO NSs for 1 h. The minimum inhibitory concentration determined to be only 16 μg mL –1 . For practical applications, Cu recovered from wastewater could reduce bacteria by 8 log CFU in 1 h. The recovered Cu was still able to reduce the bacteria by 7 log CFU after 2 months of storage in an argon atmosphere. This strategy of extracting heavy metals and subsequently reutilizing to kill bacteria will be of great significance for environmental remediation and public healthcare.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
·
IF 7.489
Jian Han,Zongji Zhang,Zongrui Hao,Guicun Li,Tong Liu
Selective dehydrogenation of formic acid is regarded as a universal strategy for providing a clean energy carrier (hydrogen, H 2 ) to reduce the dependence on fossil fuel. In this work, ultrafine PdAg nanoparticles (NPs) are successfully immobilized on NH 2 -functionalized metal–organic framework MIL-101(Cr) by a facile wet-reduction method. By virtue of amine group, the size of obtained PdAg NPs can be controlled into 2.2 nm, which are monodispersed on NH 2 -MIL-101(Cr) surface. In addition, the resulting Pd 0.8 Ag 0.2 NPs/NH 2 -MIL-101(Cr) catalyst systems demonstrate excellent catalytic activity for formic acid decomposition in mild condition, the turn over frequency (TOF) value can achieve as high as 1475 h −1 at 323 K, which is comparable to most of the reported noble metal heterogeneous catalysts for this catalytic reaction under similar conditions. The excellent catalytic kinetics is mainly attributed to the ultrafine size and high dispersion of PdAg NPs. Also, the amine group from NH 2 -MIL-101(Cr) support facilitates the O H bond dissociation of formic acid and improves the kinetics of formic acid decomposition.
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FOOD HYDROCOLLOIDS
·
2020
·
IF 7.053
Peng Wang,Cen Zhang,Yucheng Zou,Yang Li,Hui Zhang
In this study, the electrospun cellulose acetate (CA) films were alternately deposited by lysozyme and sodium alginate (SA) on the nanofiber surface by layer-by-layer self-assembly technique. With the increasing number of layers, the films presented an increased average fiber diameter from 364 to 611 nm. The enhanced thermal stability was observed due to the layer-by-layer electrostatic deposition, as well as the formation of hydrogen bonds in the case of the CA(Lys-SA) 9 film. The immobilized lysozyme exhibited the improved pH and temperature resistance, excellent storage stability, and retained over 70% of its initial activity after reusing 4 cycles. Moreover, these self-assembled films resulted in a substantial decrease in Staphylococcus aureus colonies in ultra-high temperature milk at 4 °C and 25 °C, respectively. The results suggested that the immobilization of lysozyme on layer-by-layer self-assembled electrospun films with antibacterial activity showed promising applications in milk and dairy products .
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2020
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IF 5.647
Bing Li,Li Zhang,Weizhao Yin,Sihao Lv,Ping Li,Xiangyu Zheng,Jinhua Wu
In this study, nano α-FeOOH (nFeOOH, 100–500 nm) was coated onto activated carbon (nFeOOH@AC) through a dipping means for enhanced Cr(VI) immobilization from drinking water . The nFeOOH@AC significantly improved the Cr(VI) removal from 19.9% (AC control) to 93.4%. XPS spectra and chromium speciation demonstrated that about 90% of adsorbed Cr(VI) was converted to Cr(III) by the nFeOOH@AC, accompanying with a reduction-oxidation of Fe 3+ /Fe 2+ in the nFeOOH matrix due to electrons delivering between AC and surface-bound Cr(VI). The resultant Cr(III) subsequently reacted with Fe(III) to generate stable (Cr χ Fe 1-χ )(OH) 3 precipitates, leading to a much lower Cr(III) release of 7.5% back to solution by the nFeOOH@AC as compared to the AC control of 33.8%, indicating that the nFeOOH@AC had a prospective potential for Cr(VI) immobilization and decreased Cr residue in treated drinking water. Results from column experiment also showed that the nFeOOH@AC afforded a 3.5 times higher capacity for Cr(VI) immobilization and a 3.4 times longer life-span than the pristine AC. Besides, Cr(VI) immobilization by the nFeOOH@AC was a pH-dependent process and the adsorbed Cr on the nFeOOH@AC could be readily desorbed with acetic acid. The disabled nFeOOH@AC could be refreshed by recoating nFeOOH particles with the above dipping method after stripping all the iron oxides with hydrochloric acid . This study demonstrated that nFeOOH coating is an efficient approach to enhance Cr(VI) elimination by AC during drinking water treatments.
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POLYMER
·
2021
·
IF 4.43
Hao Sun,Youyan Wei,Xiang Zheng Kong,Xubao Jiang
Uniform polyurea (PU) microspheres were prepared using isophorone diisocyanate as the only monomer either in binary solvents of water/acetone (H 2 O/AT) or water/acetonitrile (H 2 O/AN), or in ternary solvent of H 2 O/AN/DMF, by precipitation polymerization without any shaking or stirring. Through careful examination, highly uniform microspheres were obtained at monomer concentration of 28.0 wt% at 65 °C in H 2 O/AN at 20/80 by mass, a value much higher than the previously (13.0 wt%) achieved in H 2 O/AT/DMF. The microspheres were analyzed by FTIR and NMR to confirm their PU structure and used as support for covalent immobilization of laccase via glutaraldehyde coupling. The immobilized laccase showed higher storage and thermal stability than the free laccase, and exhibited higher catalytic activity and better reusability in biodegradation of Congo Red and RBBR, compared with reported studies. In addition to enhancing the productivity of uniform microspheres, this study provides a new pathway to supported catalyst for enzymatic remediation of dyes-polluted water.
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ANALYTICA CHIMICA ACTA
·
2020
·
IF 5.977
Liping Zhao,Ge Yang,Linsen Li,Chao Zhu,Yao Ma,Feng Qu
Construction of new enzyme reactor based on aptamer functionalized magnetic nanoparticles conjugated organic framework (COF) for acetylcholinesterase immobilization has been an enabling endeavor in this work. The aptamer against acetylcholinesterase was selected through a method based on capillary electrophoresis in one round. A new magnetic COF material rich of carboxyl groups was firstly synthesized, and its surface was then modified with the selected aptamer through covalently linking. Acetylcholinesterase was immobilized to fabricate the enzyme reactor Fe 3 O 4 @COF-Apt-AChE through the high affinity and specificity with its binding aptamer. The as constructed enzyme reactor was comprehensively characterized and the key factors that affected its catalysis efficiency were investigated in detail. Owing to the surface modification of the magnetic COF materials by aptamer for acetylcholinesterase immobilization, the immobilized enzyme exhibited improved substrates affinity. What’s more, good reusability (more than 8 times) and prolonged stability (enzyme activity still kept at 90% after 42 days) were also achieved. Finally, the enzyme reactor could be applied in AChE inhibitors screening, which expanded its application capability. The proposed protocol not only paves a new way for fabrication of novel aptamer functionalized magnetic COF materials as enzyme reactors, but also indicates a broadened application of the integration of aptamer and its enzyme.
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ACS Biomaterials Science & Engineering
·
2020
·
IF 4.152
Honglei Wang,Xue Qu,Zheng Zhang,Miao Lei,Haoqi Tan,Chunyan Bao,Shaoliang Lin,Linyong Zhu,Joachim Kohn,Changsheng Liu
The construction of a biomaterial matrix with biological properties is of great importance to developing functional materials for clinical use. However, the site-specific immobilization of growth factors to endow materials with bioactivities has been a challenge to date. Considering the wide existence of glycosylation in mammalian proteins or recombinant proteins, we establish a bioaffinity-based protein immobilization strategy (bioanchoring method) utilizing the native sugar–lectin interaction between concanavalin A (Con A) and the oligosaccharide chain on glycosylated bone morphogenetic protein-2 (GBMP-2). The interaction realizes the site-specific immobilization of GBMP-2 to a substrate modified with Con A while preserving its bioactivity in a sustained and highly efficient way, as evidenced by its enhanced ability to induce osteodifferentiation compared with that of the soluble GBMP-2. Moreover, the surface with Con A-bioanchored GBMP-2 can be reused to stimulate multiple batches of C2C12 cells to differentiate almost to the same degree. Even after 4 month storage at 4 °C in phosphate-buffered saline (PBS), the Con A-bioanchored GBMP-2 still maintains the bioactivity to stimulate the differentiation of C2C12 cells. Furthermore, the ectopic ossification test proves the in vivo bioactivity of bioanchored GBMP-2. Overall, our results demonstrate that the tag-free and site (i.e., sugar chain)-specific protein immobilization strategy represents a simple and generic alternative, which is promising to apply for other glycoprotein immobilization and application. It should be noted that although the lectin we utilized can only bind to d-mannose/d-glucose, the diversity of the lectin family assures that a specific lectin could be offered for other sugar types, thus expanding the applicable scope further.
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