Design and synthesis of environmentally friendly adsorbents with high adsorption capacities are urgently needed to control pollution of water resources. In this work, a calcium ion-induced approach was used to synthesize sodium alginate fibroid hydrogel (AFH). The as-prepared AFH has certain mechanical strength, and the mechanical strength is enhanced especially after the adsorption of heavy metal ions, which is very convenient for the recovery. AFH exhibited excellent adsorption performances for Cu2+, Cd2+ and Pb2+ ions and displayed very high saturated adsorption capacities (Qe) of 315.92 mg·g-1 (Cu2+), 232.35 mg·g-1 (Cd2+) and 465.22 mg·g-1 (Pb2+) with optimized pH values (3.0-4.0) and temperature (303 K). The study of isotherms and kinetics indicated that adsorption processes of heavy metal ions fitted well with the pseudo-second-order kinetics model and the Langmuir model. Pb2+ was found to have the strongest competitiveness among the three heavy metal ions. Thus, AFH has great application prospects in the field of heavy metal ions removing from wastewater.

Langmuir adsorption model

10.3389/fchem.2019.00905

Cite

Citations (30)

A Chiral‐Label‐Free SERS Strategy for the Synchronous Chiral Discrimination and Identification of Small Aromatic Molecules

Angewandte Chemie (2020)

Yue Wang Xueqi Zhao Zhi Yu Zhang‐Run Xu Bing Zhao

Abstract A versatile and robust chiral discrimination strategy for small aromatic compounds is of significant importance in multidisciplinary fields. However, most current methods lack either the sufficient sensitivity for recognizing the chirality of the target molecules or their molecular specificity information. We have developed a versatile and chiral‐label‐free surface‐enhanced Raman scattering (SERS)‐based chiral discrimination sensing system for small aromatic molecules, where the molecular structural specificity and enantioselectivity can be given synchronously in a single SERS spectrum. More than 10 types of chiral aromatic molecules were successfully identified by using this system. This work has enormous potential for recognizing chiral products effectively in sophisticated systems, especially in the fields of chiral synthesis and chiral catalysis.

Chirality

10.1002/ange.202007771

Cite

Citations (7)

A chiral signal-amplified sensor for enantioselective discrimination of amino acids based on charge transfer-induced SERS

Chemical Communications (2019)

Yue Wang Jing Liu Xueqi Zhao Chunguang Yang Yukihiro Ozaki

An ultra-high sensitivity enantioselective sensor with excellent discrimination performance for trace amino acids by using charge transfer-induced SERS.

SIGNAL (programming language)

10.1039/c9cc04665h

Cite

Citations (32)

High performance graphene oxide‐modified polybenzoxazine resin

Polymer Composites (2014)

Peijun Xu Peiliang Cong Zhao Gao Min Du Zhipeng Wang

High performance polybenzoxazine resin can be obtained by introducing partially reduced graphene oxide (PRGO) into bis‐benzoxazine (B‐BOZ) resin to overcome the defects such as low char yield, weak mechanical properties, and poor toughness of B‐BOZ resin. By virtue of the good thermal resistance and graphitization acceleration of PRGO, thermal resistance especially char yield of B‐BOZ resin can be greatly improved to 62.1% at 800°C in nitrogen. Moreover, with the folds deformation and the crack deflection of PRGO in B‐BOZ resin, the mechanical properties such as flexural strength and interlaminar shear strength of the carbon fiber reinforced B‐BOZ composite, could be greatly increased by PRGO without a decrease on modulus of B‐BOZ composite. POLYM. COMPOS., 37:1507–1514, 2016. © 2014 Society of Plastics Engineers

Heat deflection temperature

10.1002/pc.23320

Cite

Citations (15)

A Chiral‐Label‐Free SERS Strategy for the Synchronous Chiral Discrimination and Identification of Small Aromatic Molecules

Angewandte Chemie International Edition (2020)

Yue Wang Xueqi Zhao Zhi Yu Zhang‐Run Xu Bing Zhao

A versatile and robust chiral discrimination strategy for small aromatic compounds is of significant importance in multidisciplinary fields. However, most current methods lack either the sufficient sensitivity for recognizing the chirality of the target molecules or their molecular specificity information. We have developed a versatile and chiral-label-free surface-enhanced Raman scattering (SERS)-based chiral discrimination sensing system for small aromatic molecules, where the molecular structural specificity and enantioselectivity can be given synchronously in a single SERS spectrum. More than 10 types of chiral aromatic molecules were successfully identified by using this system. This work has enormous potential for recognizing chiral products effectively in sophisticated systems, especially in the fields of chiral synthesis and chiral catalysis.

Chirality

10.1002/anie.202007771

Cite

Citations (55)

Research on coal mine safety management based on improved particle swarm optimization support vector machine

Xueqi Zhao

Because the ecological environment around the coal mine is more complex, the actual mining work will pose a threat to the personal health of the on-site staff, so we should pay attention to the safety management of the coal mine, and fully ensure the safe production and operation of the mine. Especially after entering the era of big data, coal mine safety production management began to use intelligent technical means, the purpose is to control safety hazards from the source and reduce the occurrence of unnecessary safety risks. The improved particle swarm optimization support vector machine, as one of the common data mining algorithms, has relatively complete theoretical support and data classification effect. When it is applied to coal mine safety management, it can quickly grasp the rich information contained in massive data and provide an effective basis for practical safety management. Therefore, on the basis of understanding the intelligent development status of coal mine safety management, this paper mainly explores various methods and processes to improve particle swarm optimization support vector machine according to the research status of particle swarm optimization and support vector machine, and determines effective measures for coal mine safety management from the perspective of practical work.

10.1117/12.3045438

Cite

Citations (0)

Experimental evaluation of moment-rotation response of an innovative modular beam-to-fabricated column connection

CRC Press eBooks (2017)

Seyed Nima Sadeghi Amin Heidarpour Xueqi Zhao Riadh Al‐Mahaidi

Fabricated columns are reliable choices for the growing demand for higher-capacity columns. Of the fabricated columns available at present, Hybrid-Fabricated Columns (HFCs) are a game changer. Although an innovative generation of these columns consisting of plates welded to corner tubes has been developed and investigated at Monash University, the connection to these columns still needs to be investigated. In this paper, the results of monotonic tests performed on a generation of connections developed for use with HFCs and I-beams are presented. The column corner tubes are made of mild and ultra-high strength steel materials and the tests were conducted to investigate the effect of their material properties on the connection's performance. The moment-rotation curves of the tests demonstrated that this connection shows high moment capacity, ductility, and rotation. In comparison, the connection has more capacity, ductility, and stiffness when used with Ultra-High Strength Steel (UHSS) corner tubes.

10.1201/9781351210843-23

Cite

Citations (1)

Puncture-Resistant Hydrogel: Placing Molecular Complexes Along Phase Boundaries

ACS Applied Materials & Interfaces (2019)

Xueqi Zhao Mei‐Xiang Wang Yong Mei Chen Ziguang Chen Tao Suo

Trendy advances in electric cars and wearable electronics triggered growing awareness in device lethality/survivability from accidents. A divergent design in protection calls for high stress resistance, large ductility, as well as efficient energy dissipation, all from the device itself, while keeping the weight-specific device performance to its premium. Unfortunately, the polymer electrolyte or the ductile elastomer lacks a mechanistic design to resist puncture or tear at a high stress level. Here, we designed molecular complexes along phase boundaries to mitigate the damages by placing these mechanically strong complexes along the phase boundaries or between two immiscible polymers. This puncture-resistant gel, dubbed as gel-nacre, is able to survive a few challenging incidents, including a 400 MPa puncture from a sharp nail, a 1 cm steel ball traveling at 540 km/h, and attempted rupture on stitched samples.

Ductility (Earth science)

10.1021/acsami.9b02328

Cite

Citations (33)