Jiangmei Zhao,Cheng Ji,Chong Peng,Yuanfei Wang,Shuyi Yang,Yun Li,E. Tao
MnSO 4 -modified biochar (Mn-BC) was synthesized to remove berberine hydrochloride (BH) from wastewater by utilizing tea waste as raw material and MnSO 4 as modifier. Brunel Emmett Taylor (BET) analysis reveals that the specific surface area (SSA) and average pore size (D ave ) of Mn-BC are 1.4 and 7 times higher than those of pristine biochar apart, attributing to the dissociation effect can promote the dispersion of MnSO 4 in the pores of the biochar. Meanwhile, the doping of Mn not only introduces additional oxygen-containing functional groups (OCFGs), but also modulates the π electron density. Furthermore, Response surface method (RSM) analysis reveals that Mn-BC dosage has the most significant effect on BH removal, followed by BH concentration and pH value. Kinetic and isothermal studies reveal that the BH adsorption process of Mn-BC was mainly dominated by chemical and monolayer adsorption. Meanwhile, density functional theory (DFT) calculations confirm the contribution of Mn doping to the conjugation effect in the adsorption system. Originally proposed Mn-BC is one potentially propitious material to eliminate BH from wastewater, meanwhile this also provides a newfangled conception over the sustainable utilization of tea waste resources.
Qinghai Ma,Haitao Xi,Fang Cui,Jiajia Zhang,Peng Chen,Tieyu Cui
Exploring porous carbon (PC)-based materials from low-cost, renewable precursors has always been a challenging objective, since they meet the demands of next-generation supercapacitors and electrochemical devices. Herein, hierarchical multi-heteroatoms co-doped PC (MHPC) materials are successfully achieved by the carbonization and activation of tea waste that used as the self-template. The natural structure of the tea leaves combined with the activation strategy favor the formation of special hierarchical MHPC materials, which are constructed by ultrathin MHPC nanosheets. In addition, the heteroatomic doped carbon derived from organic compounds in tea leaves can act as an ideal precursor to fabricate the resultant heteroatomic functionalized carbon nanosheets. Such heteroatoms content of carbon nanosheets are adjustable by altering pyrolysis condition to effectively enhance the electrochemical performance of PC. After activation by KOH, the as-prepared MHPC, especially MHPC-3 (weight ratio of KOH/pre-carbonized tea waste is 3:1) has a superior supercapacitance of up to 170 and 132 F g −1 at current density of 0.5 and 10 A g −1 in KOH electrolyte, and an excellent capacitance retention of ∼94.8% over 14,000 cycles at 3 A g −1 . The result reported here provides valuable guidelines of high-performance energy storge devices from natural sources at the industrial scale.
Solar-driven interfacial evaporation (SDIE) is considered to be one of the most promising strategies to solve the global freshwater shortage. However, the high cost of photothermal materials, the complex manufacturing process of evaporators, and low water evaporation rates and evaporation efficiency limit their practical application. In this study, a biochar-deduced porous hydrogel (TBC-PH) based on tea waste as a raw material was prepared as an efficient solar-driven interfacial evaporator using a simple cross-linking foaming method. The evaporator exhibits good light absorption, hydrophilicity and excellent salt resistance for efficient solar evaporation. Its interconnected porous structure enhances capillary action and enables rapid water transport while effectively preventing salt crystallization. Under one solar intensity, the water evaporation rate of 3.268 kg m −2 h −1 and the solar-to-vapor conversion efficiency of 95.14 % were achieved. Besides, TBC-PH exhibits obvious purification effect on seawater and organic dye wastewater. The evaporator’s utilization of waste biomass is not only simple and economical, but also advances the practical application of waste management while addressing water scarcity, highlighting its potential as an efficient and sustainable solution for SDIE applications.
危险品化学品经营许可证（带存储）