The Alabama Center for Paper and Bioresource Engineering, which is hosted within the Department of Chemical Engineering, has a complete, controlled-conditioned, wet-test laboratory for chemically and physically evaluating pulp and paper. The center also has a pilot sized microfluidizer capable of producing both micro and nanofibrillated cellulose. Their research covers fundamental and applied research focused on industry needs, with emphasis on decarbonization and integrated biorefining.
Processing, characterization, and valorization of soybean hull \ The center also offers a range of research services to the pulp and paper and allied industries which may involve students from our program to get experience in these industry aligned research and testing projects.

Ph.D. Candidate, Advised by Dr. Zhihua Jiang
This research aims to establish an integrated and sustainable electrocoagulation process for separating and valorizing the lignin from the black liquor after the kraft pulping process. Experiments have been conducted to study the performances of different electrodes, i.e., aluminum and iron. It has been observed that with iron electrodes, the lignin removal efficiency from black liquor was 91%, much higher than the conventional methods. Also, electro-coagulated lignin from the electrocoagulation of black liquor was used to directly synthesize Magnetic Mesoporous Activated Carbon (MMAC) through carbonization. In the future, a detailed feasibility analysis of the integrated electrocoagulation process in the pulp and paper industry will be conducted. The properties of the different electro-coagulated lignins will be thoroughly characterized by various techniques, and these lignins will be evaluated for higher-value applications.

Ph.D. Candidate, Advised by Drs. Selen Cremaschi and Zhihua Jiang
This research aims to establish a cost-effective and eco-friendly process for valorizing pulp and paper sludge (PPS) through anaerobic digestion (AD) for biogas production. It focuses on optimizing the process modeling using Techno-Economic Analysis (TEA) and Life Cycle Assessment (LCA) methods, with an emphasis on methane yield and efficiency. We have conducted a preliminary TEA for three scenarios of PPS anaerobic digestion: A) the base case, B) sludge AD with alkaline pretreatment using green liquor dregs (GLD), and C) co-digestion with food waste. It was found that scenario C) is the most economically viable option.

Ph.D. Candidate, Advised by Dr. Zhihua Jiang
This research focuses on developing sustainable packaging materials by incorporating cellulose fibers and a green plasticizer into a polylactic acid (PLA) matrix, aiming to produce a 100% biobased plastic for a greener future. So far, composites have been successfully prepared and tested, showing improved tensile and flexural strength compared to neat PLA. Ongoing work includes evaluating the biodegradability, thermophysical properties, and barrier performance of these materials to assess their suitability for real-world packaging applications. In addition, as a separate project, the production of lactic acid via bacterial fermentation—used as the main feedstock for PLA—has also been examined.

Ph.D. Candidate, Advised by Drs. Tae-Sik Oh and Zhihua Jiang
This research aims to produce hollow carbon spheres (HCSs) from kraft lignin and use this material to remove pollutants from both gas and liquid phases. We have synthesized HCSs by spray drying lignin-KOH solution. Raman spectroscopy test showed that the relative ratio of the intensity of the D (disordered carbon) band to the G (graphitized carbon) band increased with the rising carbonization temperature. This result was in agreement with the XRD and BET results, which also showed that the samples have more porous and disordered structures at higher temperatures. Continuous fixed-bed adsorption tests for removing methylene blue from wastewater were conducted using HCSs, and the breakthrough curves for three different initial concentrations of MB were achieved. The data points fit the Thomas model very well at all concentrations, indicating that continuous adsorption follows the Langmuir model and second-order kinetics; this agrees with the batch experiment results. Also, the highest adsorption capacity for continuous fixed-bed adsorption was 628 mg g-1.

Ph.D. Candidate, Advised by Drs. Zhihua Jiang and Mario Eden
To remove pollutants from the gas phase, we plan to modify the surface of the HCSs by physical impregnation of different amine solutions in order to enhance their capacity for CO2 capture. For this purpose, we will use four different amines: Ethylenediamine (ETA), Diethylenetriamine (DETA), (3-Aminopropyl) triethoxysilane (APTES), and Chitosan with different loading amounts. We aim to find the optimum loading amount that maximizes the CO2 capture capacity for each amine solution. The adsorption capacity of the samples will be investigated by using setups for both static and dynamic CO2 adsorption experiments, and the data will be fitted with different isotherm and kinetics models to determine the nature of the CO2 adsorption on the samples.

Ph.D. Candidate, Advised by Dr. Zhihua Jiang
This project aims to develop efficient and sustainable methods for converting carbon dioxide (CO?) into valuable products using both electrochemical and thermochemical approaches. Our strategy involves a two-step process: in the first stage, CO? is converted to carbon monoxide (CO), which can then be used as an intermediate for the synthesis of higher-value products such as ethylene. In the thermochemical process, we achieved a CO? conversion rate of approximately 85% at temperatures up to 800?°C by treating biochar with potassium-based compounds to enhance its surface area and catalytic activity. In contrast, the electrochemical method demonstrated superior performance, with copper-based cathodes achieving over 90% efficiency in converting CO? to CO.

Ph.D. Candidate, Advised by Drs. Selen Cremaschi and Zhihua Jiang
This research, with a focus on achieving net-zero emissions, delves into the design and optimization of the CO? capture process and its analysis from technical, economic, and life cycle perspectives. We are performing preliminary research and process simulations of carbon capture via the chemical absorption process using monoethanolamine (MEA) as the solvent in Aspen Plus using both hypothetical and actual mill data.

Graduate Research Assistant, Advised by Drs. Zhihua Jiang and Xinyu Zhang
This research aims to develop an innovative approach adaptable to commercial-scale operations to produce low-cost esterified fibrillated cellulose fibers EFCFs from PMS and use them to reduce/replace the demand for bioplastics and petroleum-based plastics. We are working on using formic acid together with sulfuric acid (as a catalyst) to produce EFCFs from PMS.

Graduate Research Assistant, Advised by Dr. Zhihua Jiang
This research focuses on the development of a biodegradable and cost-effective polymer derived from hydrogel matrices synthesized using waste grain biomass. Over the past year, efforts have been concentrated on elucidating and optimizing the bonding mechanisms within the hydrogel structure. Subsequent phases of the project will involve comprehensive mechanical property characterization to identify the most viable application pathways prior to implementing further structural modifications.

Graduate Research Assistant, Advised by Dr. Zhihua Jiang
This research aims for a full biomass utilization of soybean hull (SBH) as an animal feed pellet binder using dilute acid treatment under agitation and elevated temperature for production. When incorporating the binder at a 2% addition into aquatic floating feed pellets, the water recovery of pellets increased to over 75% compared to around 64% for commercial aquatic feed binders (i.e. wheat gluten and corn starch). This increase in water stability can be attributed to better binding between the soybean hull binder and the other constituents present within the feed pellet matrix. While the previous work has shown that the SBH binder outperforms other commercial binders in terms of water stability, determining the mechanism of binding to further optimize the production is the main aim for future work on this project. We plan to do this through a thorough chemical analysis and developing a novel binder testing method to allow for quick and easy “binding capability” comparisons between binder batches at different operating conditions.

Graduate Research Assistant, Advised by Dr. Zhihua Jiang
This research investigates the kinetics of biodiesel production from crude tall oil (CTO) via microwave-assisted transesterification, using a microwave reactor coupled with an in-situ Raman spectrophotometer. CTO, a low-cost, lignocellulosic by-product of the pulp and paper industry, was employed as a sustainable non-edible feedstock. By integrating real-time Raman monitoring into the microwave reactor system, the study offers a unique platform to track the evolution of key functional groups (e.g., ester C=O at ~1740 cm?¹) and quantify reaction progress without interrupting the process. The time-resolved Raman spectra reveal kinetic trends, catalyst activity profiles, and ester formation dynamics. This work advances the understanding of fast, efficient, and green biodiesel synthesis while demonstrating the value of spectroscopic integration for real-time reaction control in biofuel production.