Industrial & Engineering Chemistry Research最新文献

Refinery production planning is the cornerstone of operational decision-making in refineries. However, current practices often optimize production planning independently, neglecting the influence of equipment maintenance planning on production planning and the coupling relationship between them. Furthermore, the pervasive issue of uncertainty poses significant challenges to decision-making processes. To address these issues, this paper proposes a collaborative optimization model that aims to optimize both production planning and equipment maintenance planning simultaneously, thereby maximizing economic returns under uncertainty. Specifically, this study utilizes the 1-norm and ∞-norm of uncertainty sets, applying the Data-driven Worst Conditional Value at Risk (DWCVaR) method to reformulate the uncertainty model and reduce decision-making risks. To accelerate the solution process, we propose a single-layer computational approach approximating the current two-layer iterative algorithm. Empirical validation demonstrates that the proposed methods not only achieve higher economic benefits but also accelerate the solution process without compromising solution accuracy.

Disposal of Cr(VI) into environments without adequate pretreatment from various industrial wastes has detrimental effects on human health that range from skin irritation to cancer depending on the dose and the exposure level. Taking this into consideration, a novel Zeolite-A/Fe₃O₄/Biochar/MOF-5 (Z-A/Fe₃O₄/BC/MOF-5) composite was synthesized through the solvothermal method for the adsorption of Cr(VI) from industrial wastewater. The phase structure, surface area, functional group, surface morphology, and elemental composition of the as-synthesized adsorbent were characterized by using XRD, BET, FT-IR, and SEM-EDX, respectively. The batch adsorption was studied by optimizing the adsorption parameters. The maximum adsorption efficiency (95.12%) and adsorption capacity (47.57 mg/g) were obtained at 15 mg/L of initial concentration, 0.3 g/L of adsorbent dose, 120 min of contact time, and pH = 5, respectively. The adsorption isotherm and kinetic of Z-A/Fe₃O₄/BC/MOF-5 composite were well fitted with the Freundlich and pseudo-second-order models, which suggests that the adsorption occurred through chemosorption on the heterogeneous adsorbent’s surface. Furthermore, the recyclability of the Z-A/Fe₃O₄/BC/MOF-5 adsorbent was conducted for five successive runs and resulted in 95.07, 89.59, 85.69, 71.74, and 64.83% for the first, second, third, fourth, and fifth runs, respectively. The synthesized quaternary adsorbent was finally tested on industrial wastewater with a Cr(VI) initial concentration of 36.27 mg/L collected from Batu Tannery Industry PLC, Ethiopia. Interestingly, the Z-A/Fe₃O₄/BC/MOF-5 composite shows higher adsorption performance, 92.85% Cr(VI) removal efficiency, much higher than its pristine MOF-5 (90.57%), binary Z-A/MOF-5 (83.05%), and ternary Z-A/Fe₃O₄/BC (82.83%) composites. This could be due to the synergic effect of the individual materials in the Z-A/Fe₃O₄/BC/MOF-5 composite. Consequently, the quaternary Z-A/Fe₃O₄/BC/MOF-5 composite is promising for the removal of Cr(VI) from industrial wastewater.

The development of polymer materials with high performance and good reusability is critical to sustainability of the polymer industry. However, the balance of these two aspects in elastomers and rubbers is highly challenging. Here, we report the synthesis of a novel polyolefin elastomer (POE) dynamically cross-linked by an imine-linked boronic ester. It improves the tensile strength at break (σ) of POE by 148.2%, Young’s modulus (E) by 92.6%, and the tensile toughness (U_T) by 49.4%, with a slightly decreased elongation at break. The cross-linked POE also has higher thermal resistance than the pristine one and presents a steady storage modulus plateau of 2.8 MPa above 150 °C. Moreover, it can be reprocessed with an impressive recovery ratio of U_T of 89.7% because of the dynamic exchanges of the boronic ester and imine. Dynamic mechanical analysis shows that the cross-linking of an imine-linked boronic ester has a short characteristic relaxation time of 9.6 min and a low apparent activation energy of 65.1 kJ·mol^–1. Our study on dynamically cross-linked POEs provides a new way for the sustainable development of polymer elastomers.

To enhance proton transfer within the proton exchange membrane, a combination of ionic and covalent cross-linking strategies was utilized to fabricate sulfonated poly(ether ether ketone) (SPEEK) composite membranes. Side chains of SPEEK were grafted, and then, the ionic cross-linking intermediates were mixed with ionic liquid (IL) [AMIM][Cl] and graphene oxide (GO). Covalent cross-linking was subsequently achieved through the Menshutkin reaction. By adjusting the proportions of IL and GO, SPEEK ionic–covalent cross-linking composite membranes (C-SPEEK/IL/GO) with enhanced performance were synthesized. The establishment of the ionic cross-linking network and the presence of covalent cross-linking within the composite membranes were confirmed using Fourier Transform Infrared Spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS), respectively. The intricate microscopic network structure within the C-SPEEK/IL/GO facilitates rapid proton transport. Consequently, the proton conductivity of C-SPEEK/IL/GO-1% attained a remarkable 47.43 mS·cm^–1 at 120 °C. The ionic–covalent cross-linking network within the C-SPEEK/IL/GO combined membrane endows it with a dense architecture, which constricts the hydrophilic channels, thereby enhancing the membrane’s dimensional stability. Additionally, the thermal stability of the C-SPEEK/IL/GO composite membrane has been significantly enhanced compared to that of the pristine SPEEK.