What is polyaluminum chloride (PAC)?

Polyaluminum chloride (PAC) is a classic inorganic polymer material, which has the advantages of easy preparation, low cost, and high efficiency in the field of water treatment and other areas of environmental protection [1, 2].

Is PAC a polymer flocculation catalyst?

The literature also indicates that Al 13 has a molecular scale of 1–2 nm and has a high charge, which is considered to be the most stable active species in PAC. Thus, PAC as “inorganic polymer flocculation catalyst” demonstrated its structural characteristics in the organic synthesis reaction system.

How much product can be obtained from a polymer flocculant?

When the reaction scale was expanded to 20 mmol, 6.23 g (89%) of product could be obtained. The classic inorganic polymer flocculant—polyaluminum chloride (PAC)—was used as an environmentally friendly, efficient, and recyclable catalyst in the synthesis of Bis (indolyl)methanes (BIMs) compounds for the first time.

What is polyaluminum chloride used for?

The classic inorganic polymer flocculant—polyaluminum chloride (PAC)—was used as an environmentally friendly, efficient, and recyclable catalyst in the synthesis of Bis (indolyl)methanes (BIMs) compounds for the first time. The strategy of catalysis is to use PAC as a Lewis acid, which contains different structures of Al–O polynuclear cations.

Why is polyaluminum chloride used as a catalyst?

Polyaluminum chloride (PAC) was used as a catalyst for the first time to synthesize bis (indolyl) methane compounds. PAC catalyst has the advantages of high efficiency, green, mild and recyclable. Al O polynuclear cations in PAC may have a synergistic catalytic effect.

Is Pac soluble or insoluble?

At this time, the PAC material was basically insoluble, exhibiting only self-assembly and aggregation behaviors, and then the micro–nano reactors were formed in the solution. However, the main active species of the PAC material at this time was the monomer Al a.