Abstract：
In this study, hydrogel beads were fabricated using alginate (Algt) polymer containing dispersed nickel phthalocyanine (NTC) nanomaterial. The viscous solution of Algt and NTC was poured dropwise into a divalent Ca2+ ions, resulting in the formation of hydrogel beads known as NTC@Algt-BDs. The surface of the NTC@Algt-BDs was further modified by coating them with different types of metal ions, yielding metal-coated M+/NTC@Algt-BDs. The adsorbed metal ions i.e., Cu+2, Ag+, Ni+2, Co+2, and Fe+3 were subsequently reduced to zero-valent metal nanoparticles (M0) by NaBH4. The prepared beads were characterized using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Initially, M0/NTC@Algt-BDs were examined for the catalytic reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP). Among them, Cu0/NTC@Algt-BDs catalyst exhibited the highest reduction rate and therefore, investigated for reduction of different nitrophenols (NPs) and dyes, including 2-nitrophenol (2-NP), 2,6-dinitrophenol (2,6-DNP), methyl orange (MO), potassium ferrocyanide (PFC), congo red (CR), and acridine orange (ArO). The highest reduction rates of 2.019 and 1.394 min-1 were observed for MO and 2-NP, respectively. Furthermore, the fabricated catalysts were employed for the efficient production of H2 gas by NaBH4 methanolysis. Among which the Ag0/NTC@Algt-BDs catalyst showed excellent catalytic production of H2 gas, exhibiting the lowest activation energy (Ea) of 25.169 kJ/mol at ambient temperature. Furthermore, the impact of NaBH4 amount, and catalyst dosage on the reduction of 2-NP and H2 gas production was conducted whereas the effect of temperature on methanolysis of NaBH4 for evolution of H2 gas was studied. The amount of H2 gas was confirmed by GC-TCD system. Additionally, the recyclability of the catalyst was investigated, as it garnered significant research interest.
摘要：
在这项研究中,使用含有分散的镍酞菁(NTC)纳米材料的藻酸盐(Algt)聚合物制造水凝胶珠。将粘稠溶液滴加到二价Ca2+离子中，导致形成称为NTC@Algt-BD的水凝胶珠。NTC@Algt-BD的表面通过涂覆不同类型的金属离子进一步改性，产生金属涂层M+/NTC@Algt-BD。吸附的金属离子，即Cu+2,Ag+,随后通过NaBH4将Ni+2、Co+2和Fe+3还原成零价金属纳米颗粒(M0)。使用扫描电子显微镜（SEM）对制备的珠子进行了表征，能量色散X射线光谱（EDX），X射线衍射(XRD)和X射线光电子能谱(XPS)(XPS)。最初，检测了M0/NTC@Algt-BD将4-硝基苯酚(4-NP)催化还原为4-氨基苯酚(4-AP)。其中,Cu0/NTC@Algt-BDs催化剂表现出最高的还原率，因此，研究了不同硝基酚(NPs)和染料的还原，包括2-硝基苯酚（2-NP），2,6-二硝基苯酚(2,6-DNP),甲基橙(MO),亚铁氰化钾（PFC），刚果红（CR），和吖啶橙（ArO）。MO和2-NP的最高还原率分别为2.019和1.394min-1，分别。此外，所制备的催化剂用于通过NaBH4甲醇分解有效生产H2气体。其中Ag0/NTC@Algt-BDs催化剂表现出优异的H2气体催化生产性能,在环境温度下表现出25.169kJ/mol的最低活化能(Ea)。此外，NaBH4量的影响，和催化剂用量对减少2-NP和H2气体的产生进行了研究，而温度对NaBH4的甲醇分解以放出H2气体的影响。H2气体的量通过GC-TCD系统确认。此外,研究了催化剂的可回收性，因为它获得了重要的研究兴趣。
