Southwest Petroleum University

About: Southwest Petroleum University is a education organization based out in Chengdu, China. It is known for research contribution in the topics: Oil shale & Adsorption. The organization has 12824 authors who have published 10378 publications receiving 103960 citations.

Removal of heavy metal ions using chitosan and modified chitosan: A review

Abstract: Chitosan and its modifications have received great attention over the past few decades due to its outstanding adsorption behavior toward various toxic heavy metals from aqueous solutions. In the review, the preparation strategies of modified chitosan (MCS) and its applications have been summarized. The effects of process variables (such as pH, temperature, adsorbent dosage, contact time, and co-existing ions), adsorption kinetics and isotherms, and adsorption mechanism were investigated. Moreover, the process parameters of heavy metal ions onto MCSs were optimized by response surface methodology. Finally, the regeneration of MCSs has been given considerable attention to evaluate their adsorption efficiency, and some dynamic adsorption studies were also discussed. The main objective of this review is to provide up-to-date information about the most important features of chitosan based adsorbents that may be helpful for synthesizing better adsorption property of modified chitosan and promoting its applications for heavy metal contaminate removal.

Progress in the functional modification of graphene/graphene oxide: a review

Abstract: Graphene and graphene oxide have attracted tremendous interest over the past decade due to their unique and excellent electronic, optical, mechanical, and chemical properties. This review focuses on the functional modification of graphene and graphene oxide. First, the basic structure, preparation methods and properties of graphene and graphene oxide are briefly described. Subsequently, the methods for the reduction of graphene oxide are introduced. Next, the functionalization of graphene and graphene oxide is mainly divided into covalent binding modification, non-covalent binding modification and elemental doping. Then, the properties and application prospects of the modified products are summarized. Finally, the current challenges and future research directions are presented in terms of surface functional modification for graphene and graphene oxide.

A modified mussel-inspired method to fabricate TiO2 decorated superhydrophilic PVDF membrane for oil/water separation

Abstract: Binding nanoparticles on complex structured materials surface is an important issue for nanotechnology, such as obtain an superwetting surface. To fabricate a highly nanoparticles decorated polymer membrane with superior surface wettability, a facile and environmentally method stills remains challenge. Taken advantage from the mussel-inspired method, we reported here that the TiO2 nanoparticles were directly anchored on the surface of poly(vinylidene fluoride) (PVDF) membrane, making the intrinsic hydrophobic polymer membrane become hydrophilic, what's more, the mussel inspired method was modified by introducing a silane coupling agent KH550, the ability to bind nanoparticles was retained and the as-prepared membrane turn from a common hydrophilic state to superhydrophilic state. Besides, the as-prepared superhydrophilic PVDF membrane could be applied on the separation of various kinds of surfactant stabilized oil-in-water emulsion with an ultrahigh efficiency nearly 99% and also shows durable oil resistance and antifouling performance, thus make the membrane easily to recycle. In addition, due to the universality of dopamine, this surface modification method should also be applicable on other organic–inorganic hybrid materials.

Coupling of heterogeneous advanced oxidation processes and photocatalysis in efficient degradation of tetracycline hydrochloride by Fe-based MOFs: Synergistic effect and degradation pathway

Abstract: In this work, a Fe-based metal organic frameworks (MIL-88A) has been synthesized through a hydrothermal method and adopted as a high-efficiency catalyst for photocatalysis (PC) coupled with sulfate radical-based advanced oxidation processes (SR-AOPs) to degrade tetracycline hydrochloride (TC-HCl) under visible light irradiation. The effects of MIL-88A/persulfate (PS) molar ratio, initial solution pH and catalyst dosage were studied. The results indicated that the combining of the photocatalysis and SR-AOPs could remarkably enhance TC degradation and 200 mg/L 100 mL TC could be degraded completely at 0.25 g/L MIL-88A, unadjusted pH value and 4 mM PS in 80 mins. The results of scavenging experiments and ESR analysis demonstrated that SO4−• and •O2– radicals were the predominant radicals for the TC degradation. The significant improvement of degradation rate in MIL-88A/PS/Vis process is attributed to the following two factors: (1) as a photocatalyst, MIL-88A could be excited by visible light, therefore photogenerated electrons (e−) on the conduction band (CB) of MIL-88A could be trapped by PS to generate SO4−• radicals. In this process, PS acted as an electron acceptor and the electron/hole recombination was suppressed leading to the enhanced photocatalyst efficiency; (2) The PS can be activated not only by photoelectrons but also Fe (III) in MIL-88A leads to the generation of SO4−• radicals more rapidly and easily. A possible mechanism and degradation pathway for TC was proposed based on the trapping/ESR experiments and liquid chromatography-mass spectrometry (LC-MS) analysis. This work proposed a new idea and method in combining two oxidation processes in degradation of organic pollutants thus could be potentially used in environmental purification.

The state-of-the-art review on energy harvesting from flow-induced vibrations

Abstract: In this paper, the currently popular flow-induced vibrations energy harvesting technologies are reviewed, including numerical and experimental endeavors, and some existing or proposed energy capture concepts and devices are discussed. The energy harvesting mechanism and current research progress of four types of flow-induced vibrations, such as vortex-induced vibrations, galloping, flutter and buffeting, are introduced. To enhance the performance of the harvesters and broaden the operating range, the researchers have proposed various mechanical designs, methods of the structures’ surfaces optimization and concepts with incorporated magnets for multistability. The paper summarizes the works led to the current wind energy and hydro energy harvesters based on the principle of flow-induced vibrations, including bladeless generator Vortex Bladeless, University of Michigan vortex-induced vibrations aquatic clean energy, Australian BPS company's airfoil tidal energy capture device bioSTREAM, and others. This shows the gradual progress and maturity of the flow-induced vibrations energy harvesters. The article concludes with a discussion on the current problems in the area of the flow-induced vibration energy capture and the challenges faced.