In this work,the boron phosphide(BP)was synthesized and used for the adsorptive removal of methylene blue(MB)dye from aqueous solutions.To determine the optimum adsorption conditions,studies were performed by varying ...In this work,the boron phosphide(BP)was synthesized and used for the adsorptive removal of methylene blue(MB)dye from aqueous solutions.To determine the optimum adsorption conditions,studies were performed by varying parameters of temperature(298–328 K),pH(2–12),contact time(0–120 min),adsorbent dose(0.01–0.20 g/50 mL),and dye concentration(10–50 mg/L).Different isotherm and kinetic models were applied to the adsorption data.The linear correlations coefficient showed that the Langmuir isotherm best fits(R^(2)=0.9996).The maximum adsorption capacity of BP was obtained as 555.56 mg/g at 55℃and the removal rate reached up to 84.11%.Additionally,the pseudo-second-order kinetic model described the adsorption process best(R^(2)=0.9998).The thermodynamic studies represented that the adsorption occurred spontaneously(ΔG_(A)^(Θ)=−24.90 kJ/mol)and endothermically(ΔH_(A)^(Θ)=16.67 kJ/mol).The results showed that BP is an efficient adsorbent for removing cationic dyes from aqueous solutions.展开更多
Preparation of highly active hydrodesulfurization catalysts is extremely meaningful for the sulfur removal from thiophene substances.In this work,commercial nano-Al_(2)O_(3)with mesoporous structure supported monometa...Preparation of highly active hydrodesulfurization catalysts is extremely meaningful for the sulfur removal from thiophene substances.In this work,commercial nano-Al_(2)O_(3)with mesoporous structure supported monometallic phosphide(NiP/Al_(2)O_(3)and MoP/Al_(2)O_(3))and bimetallic phosphide(NiMoP/Al_(2)O_(3)with various Ni/Mo molar ratio)catalysts are successfully prepared by temperature-programmed reduction.X-ray diffraction(XRD)result shows the Ni/Mo molar ratio affect the crystal phase in catalysts.Scanning electron microscopy(SEM),transmission electron microscopy(TEM)and X-ray photoelectron spectroscopy(XPS)characterizations co-confirm the interact between Ni and Mo elements in bimetallic phosphide.Catalyst evaluation in hydrodesulfurization of dibenzothiophene shows that bimetallic phosphide samples exhibit better catalytic performance than monometallic phosphide.62.1%conversion and 86.3%biphenyl selectivity with 30 h stability are achieved over NiMoP/Al_(2)O_(3)(Ni/Mo=1∶1)catalyst at 400℃under 3 MPa H_(2).All characterization results demonstrate that the improved activity of bimetallic phosphide owes to the Ni-Mo synergistic effect in NiMoP/Al_(2)O_(3)(Ni/Mo=1∶1)catalyst.This finding provides a guide to the design of bimetallic catalyst with synergistic effect.展开更多
文摘In this work,the boron phosphide(BP)was synthesized and used for the adsorptive removal of methylene blue(MB)dye from aqueous solutions.To determine the optimum adsorption conditions,studies were performed by varying parameters of temperature(298–328 K),pH(2–12),contact time(0–120 min),adsorbent dose(0.01–0.20 g/50 mL),and dye concentration(10–50 mg/L).Different isotherm and kinetic models were applied to the adsorption data.The linear correlations coefficient showed that the Langmuir isotherm best fits(R^(2)=0.9996).The maximum adsorption capacity of BP was obtained as 555.56 mg/g at 55℃and the removal rate reached up to 84.11%.Additionally,the pseudo-second-order kinetic model described the adsorption process best(R^(2)=0.9998).The thermodynamic studies represented that the adsorption occurred spontaneously(ΔG_(A)^(Θ)=−24.90 kJ/mol)and endothermically(ΔH_(A)^(Θ)=16.67 kJ/mol).The results showed that BP is an efficient adsorbent for removing cationic dyes from aqueous solutions.
基金supported by National Natural Science Foundation of China(22202093)the Scientific and Technological Innovation Youth Talent Team of Shanxi Province(202204051001005)。
文摘Preparation of highly active hydrodesulfurization catalysts is extremely meaningful for the sulfur removal from thiophene substances.In this work,commercial nano-Al_(2)O_(3)with mesoporous structure supported monometallic phosphide(NiP/Al_(2)O_(3)and MoP/Al_(2)O_(3))and bimetallic phosphide(NiMoP/Al_(2)O_(3)with various Ni/Mo molar ratio)catalysts are successfully prepared by temperature-programmed reduction.X-ray diffraction(XRD)result shows the Ni/Mo molar ratio affect the crystal phase in catalysts.Scanning electron microscopy(SEM),transmission electron microscopy(TEM)and X-ray photoelectron spectroscopy(XPS)characterizations co-confirm the interact between Ni and Mo elements in bimetallic phosphide.Catalyst evaluation in hydrodesulfurization of dibenzothiophene shows that bimetallic phosphide samples exhibit better catalytic performance than monometallic phosphide.62.1%conversion and 86.3%biphenyl selectivity with 30 h stability are achieved over NiMoP/Al_(2)O_(3)(Ni/Mo=1∶1)catalyst at 400℃under 3 MPa H_(2).All characterization results demonstrate that the improved activity of bimetallic phosphide owes to the Ni-Mo synergistic effect in NiMoP/Al_(2)O_(3)(Ni/Mo=1∶1)catalyst.This finding provides a guide to the design of bimetallic catalyst with synergistic effect.
