PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2026
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IF 7.9
Yuzhi Zhou,Linli Long,Jingyu Sun,Zongyao Li,Jingwei Niu,Jinming Duan,Min Chen,Boyu Wang,Xiaoyang Chen
Coal gangue (CG) is a mixture of abundant SiO 2 and Al 2 O 3 , and greatly suitable for the synthesis of zeolites. In this work, a cost-effective and eco-friendly tannic acid modified zeolite (zeolite@TA) was successfully developed via alkali melting-hydrothermal synthesis of zeolite from CG and followed by the modification of tannic acid onto zeolite surface using the dip-coating method. Organic additive-free fabrication process rendered zeolite@TA synthesis eco-friendly and cost-effective process. Various characterization results revealed the formation of zeolite structure, and tannic acid coating on zeolite. The results demonstrated that the zeolite@TA displayed a notable enhancement for Cd(Ⅱ) adsorption capacity, outperforming the zeolite derived from coal gangue, and zeolite@TA with a maximum theoretical Cd(Ⅱ) adsorption capacity of 184.5 mg/g exceeded zeolite (66.09 mg/g) by approximately 2.8-fold. From adsorption kinetic tests, the kinetic analysis confirmed pseudo-second-order model dominance. Among coexisting ions (Na⁺, K⁺, Mg²⁺ and NH₄⁺), Ca 2+ exhibited the strongest inhibitory effect on Cd(Ⅱ) adsorption. Thermodynamic parameters (△G°＜0, △H°＞0,△S°＞0) revealed the nature of spontaneous, endothermic and entropy-increasing process for zeolite@TA. Overall, Strategic utilization of coal gangue as a primary resource will establish a foundation for new waste-free technological solutions with dual economic-environmental benefits, and is equipped a prospective development space on wastewater cleanup applications.
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高影响因子
Environmental Technology & Innovation
·
2026
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IF 7.3
Mengqi Hao,Shurun Yao,Chuanlong Huang,Lirong Wang,Gang Liu,Zhuo Wei
Engineered biochar gain increasing research interests on persistent organic pollutants remediation due to various degradation pathways. In this study, Fe-loaded biochar immobilized catalase (CAT) composite modified with bacterial extracellular polymeric substances (EPS) (CAT-EPS-FeBC) or glutaraldehyde (GA) were synthesized, and their efficiency and mechanisms on dibutyl phthalate (DBP) removal were evaluated. The characterization results showed the advanced association affinity of EPS with both of biochar and CAT, and the formation of Iron oxide (FeO n ) during biochar pyrolysis which enhanced the association between biochar and EPS through electrostatic attraction and nucleophilic. The total DBP removal efficiencies were in order of: CAT-EPS-FeBC (70.76%) > CAT-GA-FeBC (56.02%) > FeBC (36.60%) > BC (28.45%). EPS modification exhibited higher CAT activity than glutaraldehyde (GA) with degradation enzyme, CAT-EPS-FeBC produced stronger free radicals with •OH generated from FeO n and biochar, and 1 O 2 generated from EPS and CAT. The contribution of electrochemical degradation by biochar composites was insignificant. CAT-EPS-FeBC showed lower ecotoxicity on Chlorella vulgaris than did CAT-GA-FeBC. Overall, the findings in this study demonstrated the high DBP degradation efficiency of Fe loaded biochar immobized CAT with EPS modification through pathways including sorption, CAT catalysis, and free radicals. This study can provide new ideas for the development of biochar-immobilized enzyme and the remediation of persistent organic pollutants.
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ACS ES&T Engineering
·
2026
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IF 6.3
Youyu Li,Min Zou
The low grade, high activity, and high toxicity of chromium in chromium-containing sludge present significant challenges for its immobilization and recycling. To effectively stabilize and recover chromium from chromium-containing sludge, this study presents a novel method referred to as “narrow-particle-size- fraction (Fe, Mg)1–xO solid-solution magnetization”. By prescreening the appropriate particle size fraction of (Fe, Mg)1–xO, this process leverages the thermodynamic and kinetic advantages offered by high temperatures to convert the toxic and highly mobile chromium component into a nontoxic, structurally stable, and strongly magnetic (Fe, Mg)3–xCrxO4 (0 ≤ x ≤ 2) solid-solution during roasting. The (Fe, Mg)3–xCrxO4 phase is then isolated using weak magnetic separation. Taken the chromium-containing sludge with a Cr2O3 content of 5.94 wt % as the raw material, after optimizing the (Fe, Mg)1–xO particle size fraction and roasting conditions, the chromium recovery rate in the magnetic concentrate exceeds 92%, while the grade of Cr2O3 increases to 12.47%. Various analyses confirm that the (Fe, Mg)3–xCrxO4 solid-solution is an effective magnetic carrier for chromium in chromium-containing sludge. This study provides valuable insight for the mineralogical immobilization and resource utilization of chromium-containing solid waste.
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Journal of Materials Chemistry B
·
2023
·Vol. 11
·期 6
·1302-1311
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IF 7
Hongbo Suo,Huining Geng,Lu Zhang,Guoyun liu,Hui Yan,Rui Cao,Jiahao Zhu,Yi Hu,Lili Xu
Enzymatic esterification plays an important role in the fields of chemistry and biotechnology. In this study, lipase was immobilized on an ionic liquid (IL)-modified magnetic metal–organic framework (MOF) and used to synthesize isoamyl acetate. The immobilized lipase (PPL-ILs/Fe3O4@MOF) showed 2.1-fold and 1.8-fold higher activity compared to the free and immobilized lipase without ILs (PPL-Fe3O4@MOF), respectively. In addition, the anti-denaturant ability and reusability of the PPL-ILs/Fe3O4@MOF were also higher than those of other samples. The ester yield reached 75.1% when the biocatalyst was used to synthesize isoamyl acetate in hexane. The synthesized supports supplied a good microenvironment for the immobilized lipase through multiple interactions. Results of the structural analysis showed that the conformation state of lipase molecules changed after immobilization. The magnetism of the prepared biocatalyst makes it easy to recycle so that PPL-ILs/Fe3O4@MOF maintained 70.2% of the initial activity after eight cycles. The prepared composite materials exhibited good potential in lipase immobilization with enhanced catalytic ability and stability.
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高影响因子
Journal of Environmental Chemical Engineering
·
2022
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IF 7.968
Kai He,Shuchen Wang,Yu Liu,Dong Cheng,Feng He
Under oxic environment, the corrosion of zero valent iron (ZVI) connects with its oxidation and adsorption capacity, but little is known about the effects of sulfidation on those processes of ZVI. To assess the oxidant production from ball-milling unsulfidated and sulfidated microscale ZVI (mZVI bm and S-mZVI bm ), the transformation of benzoic acid (BA) to p-hydroxybenzoic acid (p-HBA) was used as the oxidation probe reaction. During the oxidation reaction, the concentration of p-HBA in S-mZVI bm /O 2 systems rapidly reached equilibrium (< 12 μM) within 40 min regardless of sulfur loading content, whereas it could gradually reach 26 μM in mZVI bm /O 2 system within 240 min despite the slower generation of p-HBA at initial stage. Combining with the characteristic analysis, the lower oxidation capacity of S-mZVI bm /O 2 system might be ascribed to the enhanced Fe(II) dissolution that caused a larger solution pH rise along with the loss of Fe(0) and FeS x sites and the formation of lepidocrocite , which was not beneficial for oxygen activation. Under the identical conditions such as material dosage and co-existing anions, the oxidation capacity of mZVI bm /O 2 system also exceeded S-mZVI bm /O 2 system. In addition, the comparative experiment of Zn 2+ immobilization by S-mZVI bm and S-mZVI bm with or without BA was investigated. mZVI bm showed insignificant Zn 2+ immobilization, whereas BA could enhance Zn 2+ immobilization by S-mZVI bm due to the enhanced corrosion that could provide more adsorption sites. Overall, this work is valuable for assessing the oxidation capacity of S-mZVI bm /O 2 system and BA effect on heavy metal immobilization of S-mZVI in wastewater treatment .
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NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 47
·期 5
·2248-2256
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IF 3.925
Defeng Hu,Rongzhong Li,Yide Han,Hao Meng,Xia Zhang
Currently, the co-immobilization of multi-enzymes on a solid carrier and their applications in cascade catalytic reactions are primarily studied. In this study, a MOF/polymer porous membrane composed of DUT-5 incorporated polyvinylidene fluoride (PVDF) is constructed and employed in the co-immobilization of porcine pancreatic lipase (PPL) and glucose oxidase (GOx) for the first time. The loading amounts of DUT-5 nanoparticles were varied to optimize the subsequent immobilization efficiency for the two enzymes. The adsorption conditions, isotherms and kinetics for both PPL and GOx were investigated systematically, and the optimum adsorption conditions were determined and used in the co-immobilization of the two enzymes step by step. It is interesting that the maximum adsorption amounts for the two enzymes in the co-immobilization process are similar to the results obtained in the single enzyme immobilization, which indicates the better compatibility of PPL and GOx in the hybrid membranes. The catalytic activities of the co-immobilized enzymes were evaluated using a cascade oxidation reaction, in which H2O2 produced in the GOx-catalyzed oxidation of glucose worked as the oxidant in the subsequent oxidation of styrene. Further, the catalytic efficiency of the co-immobilized enzymes is compared to that of the mixed free PPL and GOx. The improved catalytic rates and better reusability of the co-immobilized enzymes highlight the broader applications of MOF-based membranes in the co-immobilization of two or more enzymes and the catalytic applicabality in the cascade organic reactions.
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JOURNAL OF HAZARDOUS MATERIALS
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2022
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IF 14.224
Lixun Zhang,Fangxin He,Yuntao Guan
Soil contamination by hexavalent chromium (Cr(VI)) poses great risks to human health and ecosystem safety. We introduced a new cheap and efficient layered double hydroxide intercalated with diethyldithiocarbamate (DDTC-LDH) for in-situ remediation of Cr(VI)-contaminated soil. The content of Cr(VI) in contaminated soil (134.26 mg kg −1 ) was rapidly reduced to 1.39 mg kg −1 within 10 days by 0.5% of DDTC-LDH. This result attains to or even exceeds the effectiveness of most of reported soil amendments for Cr(VI) removal in soils. The production cost of DDTC-LDH ($4.02 kg −1 ) was relatively low than some common materials, such as nano zero-valent iron ($22.80–140.84 kg −1 ). The growth of water spinach became better with the increase of DDTC-LDH dose from 0% to 0.5%, suggesting the recovery of soil function. DDTC-LDH significantly altered the structure and function of soil microbial communities . The species that have Cr(VI)-resistant or Cr(VI)-reductive ability were enriched in DDTC-LDH remediated soils. Network analysis revealed a significant functional niche differentiation of soil microbial communities. In addition to the enhancement of Cr(VI) reduction, the stimulation of plant growth promoting traits, including siderophore biosynthesis, oxidation resistance to reactive oxygen species , and phosphorus availability by DDTC-LDH was another essential mechanism for the immediate remediation of Cr(VI)-contaminated soil.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Peijing Shao,Zheng He,Yutao Hu,Yao Shen,Shihan Zhang,Yanan Yu
Carbonic anhydrase (CA) enzyme-based absorption processes represent a promising approach to flue gas CO 2 capture owing to their rapid absorption rates and low energy penalties. However, CA enzymes exhibit poor stability and activity under typical flue gas conditions, thus constraining their industrial utilization. Enzyme immobilization has been proposed as a potential means of improving associated stability and activity levels, thus overcoming these limitations. Herein, a variety of zeolitic imidazolate frameworks including ZIF-8, ZIF-11, and ZIF-90 with a range of organic ligands were synthesized as adsorption-based carriers for CA enzyme immobilization. In a series of experiments, CA immobilized on ZIF-8 (CA/ZIF-8) was found to retain higher activity levels that were approximately 86% of those of the free enzyme, as compared to 44% and 16% for CA/ZIF-11 and CA/ZIF-90, respectively. Immobilized CA and associated carrier frameworks were characterized via XRD, SEM, and BET. Variations in CA enzyme secondary structural characteristics in the context of immobilization were monitored via FTIR and CD to explore the molecular basis for variable activity levels associated with different carriers, revealing more hydrophilic materials to be conducive to the preservation of enzymatic activity. In addition, carrier precursor selection should take both hydrophilicity and the potential inhibitory effects of functional groups on the CA enzyme into account.
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JOURNAL OF HAZARDOUS MATERIALS
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2021
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IF 10.588
Yingying Xie,Guining Lu,Xueqin Tao,Zhen Wen,Zhi Dang
A novel collaborative strategy for enhanced removal of Cr(VI) using nano zero valent iron (nZVI) assisted by schwertmannite (Sch) with two synthesis methods was designed. Batch experiments demonstrated that nZVI/Sch-AP (synthesized by abiotic precipitation of Fe 3+ species) exhibited excellent removal performance for Cr(VI) than nZVI/Sch-CO (synthesized by chemical oxidation of Fe 2+ species). The results indicated that the removal efficiencies of Cr(VI) by nZVI/Sch-AP and nZVI/Sch-CO were highly pH-dependent and achieved to be 99.99% and 98.01% under the optimal conditions of 10 mg L −1 Cr(VI) concentration, a pH of 6.3 and a Fe(0)/Cr(VI) molar ratio of 12. But nZVI/Sch-AP emerged greater k of 0.1097 min −1 than that of nZVI/Sch-CO (0.0485 min −1 ). Humic acid exhibited promotion effect on the Cr(VI) removal in low concentration of 1 mg L −1 . Results of XRD and XPS demonstrated that α-FeOOH was the dominant products in both incubations of nZVI/Sch-AP and nZVI/Sch-CO, accompanied with FeCr 2 O 4 and Cr Fe mixed (oxy)hydroxides, and γ-FeOOH was found alone in the incubations of nZVI/Sch-CO. We proposed a consecutive and simultaneous process involving surface absorption-reduction and co-precipitation/immobilization for the removal. This study provides new insights into the elimination of Cr(VI) from wastewater by nZVI/Sch, especially in acid mine drainage .
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BIOCHEMICAL ENGINEERING JOURNAL
·
2020
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IF 3.475
Yongxing Li,Pengqian Luan,Liya Zhou,Saiguang Xue,Yihang Liu,Yunting Liu,Yanjun Jiang,Jing Gao
The synthesis or decomposition of complex substances through the combination of metals and enzymes is desirable but still a huge challenge. A kind of yolk-shell structured Co/C@SiO 2 @Ni/C nanocomposites were prepared by the polyhedral ZIF-67@SiO 2 composite as a precursor through the extended stöber method and subsequent carbonization treatment. The SiO 2 as an intermediate protective layer stabilized the morphology and structure of the carbonized products. The metallic nickel nanoparticles were uniformly distributed on the surface of Co/C@SiO 2 @Ni/C for highly specific absorption of His-tagged organophosphohydrolase (OpdA) from cell lysates via affinity, and therefore an integrated nanocatalyst (INC) named OpdA@Co/C@SiO 2 @Ni/C was successfully prepared. The prepared INC was applied to achieve a one-pot chemoenzymatic cascade degradation of organophosphates (OPs) to p -aminophenol (PAP) within 30 min. In addition, the INC proved to be a simple and high-sensitivity nanocatalyst for the detection of methyl-parathion with a low limit of detection (0.30 μM). The INC exhibited improved pH stability, thermal stability, SDS resistance, and storage stability compared to that of free enzymes. When OpdA@Co/C@SiO 2 @Ni/C was reused for 7 cycles, the cascade degradation efficiency of methyl-parathion could retain more than 60 %. This study provides a strategy for constructing a multifunctional nanocatalyst, and further demonstrated its potential in biocatalysis, accurate detection of OPs and remediation of environmental pollution.
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高影响因子
PROCESS BIOCHEMISTRY
·
2022
·
IF 4.885
Han Wei,Qian Wang,Rongjing Zhang,Maogen Liu,Weiwei Zhang
To achieve an efficient and cost-effective conversion from waste cooking oil (WCO) to biodiesel, a facile one-pot co-immobilization of Aspergillus oryzae lipase (AOL) and Rhizomucor miehei lipase (RML) was developed by rapid encapsulation of magnetic chitosan microcapsules. The encapsulation process was accomplished by self-assembly of negatively charged magnetic nanoparticles (citrate modified Fe 3 O 4 ) on ionic cross-linked chitosan-citrate aggregates containing lipases. Integrating Tween 80 bio-imprinting of lipases, the co-immobilized AOL@RML (co-im Tween 80-AOL@RML) achieved a significant increase in activity and reached 98.5 % biodiesel yield under optimal conditions, which was 1.3 and 1.6 times higher than that of single immobilized AOL and RML, respectively. Notably, owing to the beneficial synergistic impact of methanol-tolerable AOL and thermal-stable RML, co-im Tween 80-AOL@RML displayed superior activity over single lipase counterparts under excess methanol and variable temperatures. The co-im Tween 80-AOL@RML could maintained 96 % activity after 3 cycles of biodiesel production; however, showed an obvious inactivation after continued reuse. Moreover, methanol-induced denaturation of lipases and glycerol-caused agglomeration of the magnetic nanoparticles during continued transesterification were ascertained by fourier transform infrared analysis and scanning electron microscopy. This study provides new pathways for constructing multi-lipase co-immobilzation as well as an economical and effective biocatalyst for biodiesel production from WCO.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
He-Xiang Zhao,Ming-Xin Li,Yan Wang,Yuan-Zhuo Tan,Zi-Xiong Zhou,Yuan-Ru Guo,Qing-Jiang Pan
Utilizing nature resource is one of the most effective ways to achieve sustainability development. In this work, super low-concentration CO 2 in the atmosphere and rich and cheap biomaterial cellulose were used to prepare magnetic bio-composite, cellulose nanofiber/Fe 3 O 4 /CaCO 3 (CFeCa). By capturing CO 2 in air, Ca 2+ was transformed into calcite CaCO 3 , which subsequently coated on cellulose nanofiber (CNF). Fe 3 O 4 with about 50 nm in size were also observed to attach to the CNF. Thus, CNF bridged these two inorganic materials, which together fabricated stable composite with strong mutual coupling. The prepared CFeCa was applied to purify the lead-polluted water as water treatment agent. Its up-taken capacity for Pb 2+ reached as high as 1010 mg·g −1 . Almost 100% removal efficiency was attained, even treating Pb 2+ wastewater in a wide concentration range from 5 to 250 ppm. Meanwhile, CFeCa is stable property during application. After running for 30 cycles, the treated water still met drinkable water standard. More importantly, the recovered lead was also bound on the surface of CNF, which make it easy to be separated from water and avoiding the risk of second pollution. Cheap raw materials and multiple merits of resulted composite offer CFeCa a perspective application as water treatment agent.
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