Tiantian Xu,Jiangkun Du,Jian Zhang,Werner David,Peng Liu,Muhammed Faheem,Xiaowei Zhu,Jiawei Yang,Jianguo Bao
This study provided a novel pathway to develop activated carbon with enhanced adsorption performance via feedstock pretreatment by fungi. The growth of Pleurotus ostreatus on cottonseed husks offered this feedstock an advantageous pore size for porous carbon making. The prepared activated carbons derived from cottonseed husks (CSH-ACs) during different fungal growth periods exhibited extraordinary performance than commercial activated carbon for sulfanilamide adsorptive removal. Their experimental data of adsorption capacities for sulfanilamide were 139.43, 146.15, and 146.16 mg g −1 , respectively. The adsorption behaviors of sulfanilamide on CSH-ACs were evaluated by kinetic, isotherm and thermodynamic models. Pore filling, hydrogen-bond forming and π-π staking interactions all contributed to the rapid sulfanilamide removal. The microporous-mesoporous structure, stronger hydrophilicity, and richer functional groups moieties owing to the lignocellulose decomposition in the plant wall significantly strengthened the adsorption process on the microbial-mediated activated carbon. The effects of pH and water impurities (H 2 PO 4 - , CO 3 2- , SO 4 2- , Cl - , and humic acid) on sulfanilamide removal were investigated by a single factor experimental design. Results indicated that CSH-ACs were suitable for sulfanilamide removal in actual wastewater treatment with wide pH adaptability and resilience to interference.
Chenggu Cai,Pengju Huo,Pingxiang Zhong,Lei Ma,Zhaoxian Xu,Maozhi Ren,Zuoren Yang,Fuguang Li
Cottonseed hulls (CSHs) emerge as a promising lignocellulosic feedstock for synthesizing high-value products through the biorefinery approach. However, scant attention has been devoted to a detailed characterization of their primary components, particularly the intricate lignin fraction. This study conducted a comprehensive compositional analysis of CSHs, primarily delving into the intricate characterization of lignin samples extracted via organosolv and alkaline methods. The investigation encompassed the fundamental lignin unit composition, inter-chemical linkages, molecular weight distribution, and functional group profile. Further analysis revealed that alkaline-extracted lignin possesses a higher abundance of low-molecular-weight lignin fragments and hydroxyl groups than organosolv-extracted lignin. This distinct characteristic renders alkaline lignin a favorable candidate for producing chemicals and functional materials via bioconversion and chemical modification. To demonstrate this, alkaline lignin was successfully valorized into cis , cis -muconate and white lignin material. This study provides valuable insights into the fundamental characteristics of CSH lignin, uncovering its potential for the synthesis of value-added chemicals and materials.
Jing Cui,Dan Fang,Xinquan Tian,Jun Peng,Di Chen,Shuangjiao Xu,Lei Ma
This study presents a novel approach for converting cottonseed hulls (CSHs) into valuable proanthocyanidins (PAs) through deep eutectic solvent (DES)-based ultrasound-assisted extraction (UAE-DES). Response surface methodology (RSM) was applied to optimize and model this process, resulting in maximum yields of 78.58 mg/g. The ideal PA extraction conditions were determined to be a liquid-to-material ratio of 36.25 mL/g, a water content of 33.21%, and an extraction period of 7.4 min. Molecular dynamic simulations (MDS) were performed to study the interactions between the solvent and target chemicals. Increased van der Waals forces and stronger interactions between DES and the target chemical catechin (CA) compared to those observed with methanol or water were observed. Furthermore, the optimized extract exhibited a higher PA content than can be obtained with conventional extraction methods and demonstrated antioxidant activity in vitro. The cottonseed hulls residues (CSRs) remaining after the extraction process can be used to produce activated carbon (AC CSR ), which has some capacity to adsorb methylene blue (MB) contaminants. This study offers a reference for the fruitful transformation of waste biomass into high-value products.
危险品化学品经营许可证（带存储）